diff --git a/benchmark/manners/manners.nools b/benchmark/manners/manners.nools index c3c80ab..2a6eb71 100644 --- a/benchmark/manners/manners.nools +++ b/benchmark/manners/manners.nools @@ -106,7 +106,6 @@ rule findSeating { not(chosen : Chosen chosen.id == sid && chosen.guestName == leftGuestName && chosen.hobby == rightGuestHobby); } then { - console.log("findSeating"); assert(new Seating({ id : countValue, pid : sid, @@ -132,7 +131,6 @@ rule makePath { not( p2 : Path p2.id == sid && p2.guestName == pathGuestName); } then { - console.log("makePath"); assert(new Path({id : sid, seat : pathSeat, guestName : pathGuestName})); } } @@ -143,7 +141,6 @@ rule pathDone { s : Seating s.path == false; } then { - console.log("pathDone"); modify(s, function(){ this.path = true; }); @@ -171,7 +168,6 @@ rule continue { c : Context c.state == 'check'; } then { - console.log("continue"); modify(c, function(){this.state = 'assign'}); } } diff --git a/benchmark/sendMoreMoney/benchmark.js b/benchmark/sendMoreMoney/benchmark.js new file mode 100644 index 0000000..ba53640 --- /dev/null +++ b/benchmark/sendMoreMoney/benchmark.js @@ -0,0 +1,14 @@ +"use strict"; + +var nools = require("../../index"), + flow = nools.compile(__dirname + "/sendMoreMoney.nools"); + +var start = new Date(), + session; +console.log("starting"); +(session = flow.getSession(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)).match().then(function () { + console.log("%dms", +(new Date()) - start); + session.dispose(); +}); + + diff --git a/benchmark/sendMoreMoney/sendMoreMoney.nools b/benchmark/sendMoreMoney/sendMoreMoney.nools new file mode 100644 index 0000000..8183380 --- /dev/null +++ b/benchmark/sendMoreMoney/sendMoreMoney.nools @@ -0,0 +1,18 @@ +rule SendMoreMoney { + when { + s : Number s != 0; + e : Number e != s; + n : Number n != s && n != e; + d : Number d != s && d != e && d != n; + m : Number m != 0 && m != s && m != e && m != n && m != d; + o : Number o != s && o != e && o != n && o != d && o != m; + r : Number r != s && r != e && r != n && r != d && r != m && r != o; + y : Number y != s && y != e && y != n && y != d && y != m && y != o && y != r + && (s*1000 + e*100 + n*10 + d + m*1000 + o*100 + r*10 + e) == (m*10000 + o*1000 + n*100 + e*10 + y); + } + then { + console.log('pathDone', {s : s, e : e, n : n, d : d, m : m, o: o, r : r, y : y}); + console.log((s*1000 + e*100 + n*10 + d + m*1000 + o*100 + r*10 + e)); + console.log((m*10000 + o*1000 + n*100 + e*10 + y)) + } +} \ No newline at end of file diff --git a/benchmark/waltzDb/waltzDb.nools b/benchmark/waltzDb/waltzDb.nools index 891d347..e0607fd 100644 --- a/benchmark/waltzDb/waltzDb.nools +++ b/benchmark/waltzDb/waltzDb.nools @@ -829,7 +829,7 @@ rule visit_2j_2 { // ; (write edge_label (crlf)) // (make edge_label ^p1 ^p2 ^l_name ^l_id ) // (make edge_label ^p1 ^p2 ^l_name ^l_id )) -rule visit_2j_0 { +rule visit_2j_3 { when { s : Stage s.value == 'VISITING_2J'; j : Junction j.visited == 'now' {name : name, basePoint : basePoint, p1 : p1, p2 : p2}; @@ -922,7 +922,7 @@ rule start_checking { // --> // (modify 1 ^value remove_label) // (make illegal ^bp ^l_id )) -rule checking1 { +rule checking { when { stage : Stage stage.value == 'CHECKING'; junction : Junction junction.visited == 'check' {basePoint : basePoint}; diff --git a/docs-md/examples.md b/docs-md/examples.md index 8cf9a0b..f600335 100644 --- a/docs-md/examples.md +++ b/docs-md/examples.md @@ -2,6 +2,7 @@ * [Conways 2D](./examples/browser/conways_2d.html) * [Conways 3D](./examples/browser/conways_3d.html) + * [Sudoku](./examples/browser/sudoku.html) * [Fibonacci](./examples/browser/fibonacci.html) * [Miss Manners](./examples/browser/manners.html) * [Diagnosis](./examples/browser/diagnose.html) diff --git a/docs/History.html b/docs/History.html index bc09f06..de60546 100644 --- a/docs/History.html +++ b/docs/History.html @@ -178,6 +178,18 @@ +

0.2.0 / 2013-10-14

+
    +
  • Nools now supports true modify!!!
      +
    • This is a major leap forward for nools opening the door for more complex actions and expressions in the rules.
      • +
    +
    • +
  • Added support from for from conditions in the rhs.
    • +
  • Fixed issue #81.
    • +
  • Fixed issue #82.
    • +
  • Added new sudoku web example.
    • +
  • Added Send More Money benchmark see #78.
    • +

0.1.14

  • Fixed issue with async actions and early match termination.
    • diff --git a/docs/examples.html b/docs/examples.html index 6c8e337..7d94e33 100644 --- a/docs/examples.html +++ b/docs/examples.html @@ -182,6 +182,7 @@

    Examples

    • Conways 2D
    • Conways 3D
      • +
    • Sudoku
    • Fibonacci
    • Miss Manners
    • Diagnosis
      • diff --git a/docs/examples/browser/assets/array-extended.js b/docs/examples/browser/assets/array-extended.js new file mode 100644 index 0000000..ba1aad0 --- /dev/null +++ b/docs/examples/browser/assets/array-extended.js @@ -0,0 +1,3 @@ +/*! array-extended - v0.0.9 - 2013-06-17 + * Copyright (c) 2013 Doug Martin; Licensed MIT */ +!function(){"use strict";function a(a,b,c){function d(a,b){return o(b,function(b,c){return N(c)||(c=[c]),c.unshift(a),b.unshift(c),b},[])}function e(a,b,c){for(var d=[],e=0;e>>0;if(0===d)return-1;var e=d;arguments.length>2&&(e=Number(arguments[2]),e!==e?e=0:0!==e&&e!==1/0&&e!==-(1/0)&&(e=(e>0||-1)*P(Q(e))));for(var f=e>=0?R(e,d-1):d-Q(e);f>=0;f--)if(f in c&&c[f]===b)return f;return-1}function i(a,b,c){if(a&&X&&X===a.filter)return a.filter(b,c);if(!N(a)||"function"!=typeof b)throw new TypeError;for(var d=Object(a),e=d.length>>>0,f=[],g=0;e>g;g++)if(g in d){var h=d[g];b.call(c,h,g,d)&&f.push(h)}return f}function j(a,b,c){if(!N(a)||"function"!=typeof 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_(a,b)[0]}function u(a,b){return _(a,b)[a.length-1]}function v(a){var b=a,c=J($(arguments,1));return N(a)&&(b=i(a,function(a){return-1===g(c,a)})),b}function w(a){var b,c=[],d=-1,e=0;if(a)for(b=a.length;++d0?(c.push(c.shift()),b--):(c.unshift(c.pop()),b++),y(c,b)):c}function z(a,b){var c=[];if(N(a)){var d=a.slice(0);"number"!=typeof b&&(b=a.length),b?b<=a.length&&(c=n(a,function(a,c,f){var g;return g=b>1?e(c,y(d,f).slice(1),b):[[c]],a.concat(g)},[])):c=[[]]}return c}function A(){var a=[],c=$(arguments);if(c.length>1){var d=c.shift();N(d)&&(a=n(d,function(a,d,e){for(var f=[d],g=0;gd;d++)c.push(a[b[d]]||null);return c}function D(){var a=[],b=$(arguments);if(b.length>1){for(var c=0,d=b.length;d>c;c++)a=a.concat(b[c]);a=w(a)}return a}function E(){var a,b,c=[],d=-1;if(a=arguments.length>1?$(arguments):arguments[0],N(a))for(c=a[0],d=0,b=a.length;++d1?c:p(a),n(b,function(a,b){return a.concat(b)},[])}function K(a,b){b=b.split(".");var c=a.slice(0);return j(b,function(a){var 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100644 --- a/docs/examples/browser/assets/conways.css +++ b/docs/examples/browser/assets/conways.css @@ -152,6 +152,23 @@ input[type="submit"], input[type="button"] { box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.2); } +.sudoku .col { + width: 50px; + height: 50px; + font-size: 30px; + vertical-align: middle; + text-align: center; +} + +.sudoku .col.error { + background-color: rgba(255, 0, 0, 0.43); +} + +.sudoku #grid{ + width: 465px; + height: 470px; +} + .col.live { background-color: black; } diff --git a/docs/examples/browser/rules/conways3d.nools b/docs/examples/browser/rules/conways3d.nools index e9af56a..4f71c5f 100644 --- a/docs/examples/browser/rules/conways3d.nools +++ b/docs/examples/browser/rules/conways3d.nools @@ -71,6 +71,8 @@ rule Transition { if(cell.transition()){ emit("cell-transition", cell); transitioned = true; + }else{ + retract(cell); } }); emit("evaluate"); diff --git a/docs/examples/browser/rules/sudoku.nools b/docs/examples/browser/rules/sudoku.nools new file mode 100644 index 0000000..cd2661f --- /dev/null +++ b/docs/examples/browser/rules/sudoku.nools @@ -0,0 +1,377 @@ + +rule "terminate group" { + salience: -100; + agenda-group: "validate"; + when { + $state: String $state == "validate"; + } + then{ + console.log("Validation complete." ); + retract($state); + halt(); + } +} + + + +rule "duplicate in cell col" { + agenda-group: "validate"; + when{ + $c: Cell $c.value; + $e: Cell $e.value == $c.value from $c.exCells; + } + then { + emit("invalid", $c); + emit("invalid", $e); + } +} + + +rule "halt after setup" { + when{ + $ctr: Counter $ctr.count == 0; + } + then{ + console.log("halt after setup"); + halt(); + } +} + + +rule "emergency halt 2" { + salience: 100; + when{ + $c: Cell !$c.value && $c.count == 0; + } + then{ + console.log("emergency halt cell without a value and no free values"); + halt(); + //process.exit(); + } + +} + +// A Setting object is inserted to define the value of a Cell. +// Rule "set a value" updates the cell and all cell groups containing it. +rule "set a value"{ + when{ + // a Setting with row and column number, and a value + $s: Setting {rowNo: $rn, colNo: $cn, value: $v}; + + // a matching Cell, with no value set + $c: Cell $c.rowNo == $rn && $c.colNo == $cn && !$c.value {cellRow: $cr, cellCol: $cc, cellSqr: $cs}; + } + then { + // modify the Cell by setting its value + modify( $c, function(){ this.blockExcept(); this.value = $v;}); + emit("set-value", $c); + console.log( "set cell " + $c.toString() ); + modify( $cr, function(){ this.blockValue( $v ) }); + modify( $cc, function(){ this.blockValue( $v ) }); + modify( $cs, function(){ this.blockValue( $v ) }); + } +} + + +// Rule for removing a value from all cells that are siblings +// in one of the three cell groups. +rule "eliminate a value from Cell" { + salience: 1; + when{ + // a Setting with row and column number, and a value + $s: Setting {rowNo: $rn, colNo: $cn, value: $v}; + + // the matching Cell, with the value already set + $mc : Cell $mc.rowNo == $rn && $mc.colNo == $cn && $mc.value == $v {exCells: $exCells}; + + // for all Cells that are in cahoots with the updated cell + $c: Cell $v in $c.free from $exCells; + } + then{ + console.log( "clear " + $v + " from cell " + $c.posAsString() + " because of " + $mc.posAsString() ); + // modify a related Cell by blocking the assigned value + modify( $c, function(){ this.blockValue( $v ); }); + } +} + +//Rule for elimination the Setting fact. +rule "retract setting"{ + when { + // a Setting with row and column number, and a value + $s: Setting {rowNo: $rn, colNo: $cn, value: $v}; + + // the matching Cell, with the value already set + $c: Cell $c.rowNo == $rn && $c.colNo == $cn && $c.value == $v; + + // This is the negation of the last pattern in the previous rule. + // Now the Setting fact can be safely retracted. + not( $x: Cell $v in $x.free && $x in $c.exCells); + // count down + $ctr: Counter {count: $count}; + + } + then{ + console.log("retracting " + $s.toString()); + // Discard the Setter fact. + retract( $s ); + console.log("COUNT = %s", $count); + modify( $ctr, function(){ this.count = $count - 1;}); + console.log( "done setting cell " + $c.toString() ); + } +} + + +// Detect a set of candidate values with cardinality 1 for some Cell. +// This is the value to be set. +rule "single"{ + when { + // There is currently no setting under way. + not($ns: Setting); + + // One element in the "free" set. + $c: Cell $c.count == 1 {rowNo: $rn, colNo: $cn}; + } + then { + var i = $c.freeValue(); + console.log( "single " + i + " at " + $c.posAsString() ); + // Insert another Setter fact. + assert( new Setting( $rn, $cn, i ) ); + } +} + +// Detect a set of candidate values with a value that is the only one +// in one of its groups. This is the value to be set. +rule "hidden single" { + when{ + // There is currently no setting under way. + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + // Some integer. + $i: Number; + + // The "free" set contains this number. + $c: Cell $c.count > 1 && $i in $c.free {rowNo: $rn, colNo: $cn}; + + // We have a cell group containing this cell $c + $cg: CellGroup $c in $cg.cells; + // but no other cell from that group contains $i + not ($nc2: Cell $nc2 != $c && $i in $nc2.free from $cg.cells); + } + then { + console.log( "hidden single " + $i + " at " + $c.posAsString() ); + // Insert another Setter fact. + assert( new Setting( $rn, $cn, $i ) ); + } +} + + +// A "naked pair" is two cells in some cell group with their sets of +// permissible values being equal with cardinality 2. These two values +// can be removed from all other candidate lists in the group. +rule "naked pair" { + when { + // There is currently no setting under way. + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + + // One cell with two candidates. + $c1: Cell $c1.count == 2 {free: $f1, cellRow: $r1, rowNo: $rn1, colNo: $cn1, cellSqr: $b1}; + + // The containing cell group. + $cg: CellGroup $cg.count > 2 && $c1 in $cg.cells; + + // Another cell with two candidates, not the one we already have. + $c2: Cell( $c2 != $c1 && deepEqual($c2.free, $f1) ) from $cg.cells; + + // Get one of the "naked pair". + $v: Number from $c1.free; + + // Get some other cell with a candidate equal to one from the pair. + $c3: Cell $c3 != $c1 && $c3 != $c2 && $c3.count > 1 && $v in $c3.free from $cg.cells; + } + then{ + console.log( "remove " + $v + " from " + $c3.posAsString() + " due to naked pair at " + $c1.posAsString() + ":[" + $f1.join(",") + "] and " + $c2.posAsString() + ":[" + $c2.free.join(",") + "]" ); + // Remove the value. + modify( $c3, function(){ this.blockValue( $v ); }); + } +} + +// If two cells within the same cell group contain candidate sets with more than +// two values, with two values being in both of them but in none of the other +// cells, then we have a "hidden pair". We can remove all other candidates from +// these two cells. +// +rule "hidden pair in row" { + when{ + // There is currently no setting under way. + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + // Establish a pair of Integer facts + $i1: Number; + $i2: Number $i2 > $i1; + + // Look for a Cell with these two among its candidates. (The upper bound on + // the number of candidates avoids a lot of useless work during startup.) + $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellRow: $cellRow}; + + // Get another one from the same row, with the same pair among its candidates, + $c2: Cell $c2 != $c1 && $c2.cellRow == $cellRow && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free; + + // Assertain that no other cell in the group has one of these two values. + not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellRow.cells) + } + then{ + console.log( "hidden pair in row at " + $c1.posAsString() + " and " + $c2.posAsString() ); + // Set the candidate lists of these two Cells to the "hidden pair". + modify( $c1, function(){this.blockExcept([$i1, $i2]) }); + modify( $c2, function(){this.blockExcept([$i1, $i2]) }); + } +} + +rule "hidden pair in column"{ + when{ + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + $i1: Number; + $i2: Number $i2 > $i1; + + $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellCol: $cellCol}; + $c2: Cell $c2 != $c1 && $c2.cellCol == $cellCol && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free; + not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellCol.cells) + } + then{ + console.log( "hidden pair in column at " + $c1.posAsString() + " and " + $c2.posAsString() ); + modify( $c1, function(){this.blockExcept([$i1, $i2]) }); + modify( $c2, function(){this.blockExcept([$i1, $i2]) }); + } +} + +rule "hidden pair in square" { + when{ + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + $i1: Number; + $i2: Number $i2 > $i1; + + $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellSqr: $cellSqr}; + $c2: Cell $c2 != $c1 && $c2.cellSqr == $cellSqr && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free; + + not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellSqr.cells) + } + then{ + console.log( "hidden pair in square " + $c1.posAsString() + " and " + $c2.posAsString() ); + modify( $c1, function(){this.blockExcept([$i1, $i2]) }); + modify( $c2, function(){this.blockExcept([$i1, $i2]) }); + } +} + + +rule "X-wings in rows" { + when{ + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + $i: Number; + + $ca1: Cell $ca1.count > 1 && $i in $ca1.free {cellRow: $ra, rowNo: $rano, cellCol: $c1,colNo: $c1no}; + $cb1: Cell $cb1.count > 1 && $i in $cb1.free && $cb1.rowNo > $rano && $cb1.cellCol == $c1 {cellRow: $rb, rowNo: $rbno}; + not($nc2: Cell $nc2 != $ca1 && $nc2 != $cb1 && $i in $nc2.free from $c1.cells); + + $ca2: Cell $ca2.count > 1 && $1 in $ca2.free && $ca2.cellRow == $ra && $ca2.colNo > $c1no {cellCol: $c2, colNo: $c2no}; + $cb2: Cell $cb2.count > 1 && $i in $cb2.free && $cb2.cellRow == $rb && $cb2.cellCol == $c2; + not($nc3: Cell $nc3 != $ca2 && $nc3 != $cb2 && $i in $nc3.free from $c2.cells); + + $cx: Cell ($cx.rowNo == $rano || $cx.rowNo == $rbno) && $cx.colNo != $c1no && $cx.colNo != $c2no && $cx.count > 1 && $i in $cx.free; + } + then{ + + console.log( "X-wing with " + $i + " in rows " + + $ca1.posAsString() + " - " + $cb1.posAsString() + + $ca2.posAsString() + " - " + $cb2.posAsString() + ", remove from " + $cx.posAsString() ); + + modify( $cx, function(){ this.blockValue( $i ) }); + } +} + +rule "X-wings in columns"{ + when{ + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + $i: Number; + + + $ca1: Cell $ca1.count > 1 && $i in $ca1.free {cellRow: $ra, rowNo: $rano, cellCol: $c1,colNo: $c1no}; + + $ca2: Cell $ca2.count > 1 && $i in $ca2.free && $ca2.colNo > $c1No && $ca2.cellRow == $ra {cellCol: $c2, colNo: $c2no}; + not( $nc2: Cell $nc2 != $ca1 && $nc2 != $ca2 && $i in $nc2.free from $ra.cells); + + $cb1: Cell $cb1.count > 1 && $i in $cb1.free && $cb1.cellCol == $c1 && $cb1.rowNo > $rano {cellRow: $rb, rowNo: $rbno}; + $cb2: Cell $cb2.count > 1 && $i in $cb2.free && $cb2.cellCol == $c2 && $cb2.cellRow == $rb; + not($nc3: Cell $nc3 != $cb1 && $nc3 != $cb2 && $i in $nc3.free from $rb.cells); + + $cx: Cell ($cx.colNo == $c1no || $cx.colNo == $c2no) && $cx.rowNo != $rano && $cx.rowNo != $rbno && $cx.count > 1 && $i in $cx.free; + } + then{ + + console.log( "X-wing with " + $i + " in columns " + + $ca1.posAsString() + " - " + $ca2.posAsString() + + $cb1.posAsString() + " - " + $cb2.posAsString() + ", remove from " + $cx.posAsString() ); + + modify( $cx, function(){this.blockValue( $i ) }); + } +} + +rule "intersection removal column" { + when { + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + $i: Number; + + // occurs in a Cell + $c: Cell $i in $c.free {cellSqr: $cs, cellCol: $cc}; + // but not in another cell of the same square and a different column + not($nc2: Cell $nc2 != $c && $i in $nc2.free && $nc2.cellSqr == $cs && $nc2.cellCol != $cc ); + + // but there is a cell in the same column and another sqstuare containing this value + $cx: Cell $cx.count > 1 && $i in $cx.free && $cx.cellCol == $cc && $cx.cellSqr != $cs; + } + then{ + // remove the value from that other cell + //if (explain) { + console.log( "column elimination due to " + $c.posAsString() + + ": remove " + $i + " from " + $cx.posAsString() ); + //} + modify( $cx, function(){this.blockValue( $i ) }); + } +} + +rule "intersection removal row"{ + when{ + not($ns: Setting); + not($nc: Cell $nc.count == 1 ); + + $i: Number; + // occurs in a Cell + $c: Cell $i in $c.free {cellSqr: $cs, cellRow: $cr}; + // but not in another cell of the same square and a different row + not($nc2: Cell $nc2 != $c && $i in $nc2.free && $nc2.cellSqr == $cs && $nc2.cellRow != $cr); + + // but there is a cell in the same row and another square containing this value + $cx: Cell $cx.count > 1 && $i in $cx.free && $cx.cellRow == $cr && $cx.cellSqr != $cs; + } + then { + // remove the value from that other cell + //if (explain) { + console.log( "row elimination due to " + $c.posAsString() + + ": remove " + $i + " from " + $cx.posAsString() ); + //} + modify( $cx, function(){ this.blockValue( $i ) }); + } +} diff --git a/docs/examples/browser/src/sudoku.js b/docs/examples/browser/src/sudoku.js new file mode 100644 index 0000000..31da919 --- /dev/null +++ b/docs/examples/browser/src/sudoku.js @@ -0,0 +1,368 @@ +(function () { + /*global $:true*/ + var declare = this.declare, + arr = this.arrayExtended, + unique = arr.unique; + + var allNine = [1, 2, 3, 4, 5, 6, 7, 8, 9]; + + var SetOfNine = declare({ + instance: { + + free: null, + count: 0, + + constructor: function () { + this.count = (this.free = allNine.slice()).length; + }, + + blockValue: function (value) { + var index = arr.indexOf(this.free, value); + if (index !== -1) { + this.free.splice(index, 1); + this.count = this.free.length; + } + return this; + }, + + blockExcept: function (values) { + this.free = values || []; + this.count = this.free.length; + return this; + }, + + freeValue: function () { + return this.free[0]; + } + } + }).as(this, "SetOfNine"); + + var CellGroup = SetOfNine.extend({ + instance: { + cells: null, + + constructor: function () { + this._super(arguments); + this.cells = []; + }, + + addCell: function (cell) { + this.cells.push(cell); + } + } + }).as(this, "CellGroup"); + + + var CellFile = CellGroup.extend({ + instance: { + number: null, + + constructor: function (number) { + this._super(arguments); + this.number = number; + }, + + toString: function () { + var ret = [], cells = this.cells; + for (var i = 0, l = cells.length; i < l; i++) { + ret.push(cells[i].toString()); + } + return ret.join(", "); + } + } + }).as(this, "CellFile"); + + var Cell = SetOfNine.extend({ + instance: { + value: null, + cellRow: null, + cellCol: null, + cellSqr: null, + exCells: null, + el: null, + + constructor: function () { + this._super(arguments); + this.exCells = []; + }, + + makeReferences: function (cr, col, sqr) { + this.cellRow = cr; + this.cellCol = col; + this.cellSqr = sqr; + this.colNo = col.number; + this.rowNo = cr.number; + this.exCells = unique(this.exCells.concat(cr.cells).concat(col.cells).concat(sqr.cells)); + this.exCells.splice(this.exCells.indexOf(this), 1); + return this; + }, + + toString: function () { + return [this.posAsString(), this.valueAsString()].join(": "); + }, + + valueAsString: function () { + return this.value === null ? " ": this.value; + }, + + posAsString: function () { + return ["[", this.cellRow.number, ",", this.cellCol.number, "]"].join(""); + } + } + }).as(this, "Cell"); + + var CellCol = CellFile.extend({ + instance: { + toString: function () { + return ["Column ", this.number, ": ", this._super(arguments)]; + } + } + }).as(this, "CellCol"); + + + var CellRow = CellFile.extend({ + instance: { + toString: function () { + return ["Row ", this.number, ": ", this._super(arguments)]; + } + } + }).as(this, "CellRow"); + + var CellSqr = CellGroup.extend({ + instance: { + constructor: function (cr1, cr2, cr3, cc1, cc2, cc3) { + this._super(arguments); + for (var i = cr1.number; i <= cr3.number; i++) { + this.addCell(cc1.cells[i]); + this.addCell(cc2.cells[i]); + this.addCell(cc3.cells[i]); + } + + } + } + }).as(this, "CellSqr"); + + var Counter = declare({ + instance: { + count: 0, + constructor: function (count) { + this.count = count; + } + } + }).as(this, "Counter"); + + + var Setting = declare({ + instance: { + rowNo: null, + colNo: null, + value: null, + + constructor: function (row, col, value) { + this.rowNo = row; + this.colNo = col; + this.value = value; + }, + + toString: function () { + return "Setting [" + this.rowNo + "," + this.colNo + "] : " + this.value; + } + + } + }).as(this, "Setting"); + + + var Stepping = declare({ + instance: { + emergency: false + } + }).as(this, "Stepping"); + + var Sudoku = declare({ + instance: { + + constructor: function (flow, statsListener) { + this.rows = []; + this.cols = []; + this.sqrs = []; + this.cells = []; + this.flow = flow; + this.statsListener = statsListener; + this.session = null; + this.stepping = null; + }, + + stop: function () { + if (this.session) { + this.session.halt(); + this.session.dispose(); + } + return this; + }, + + clear: function () { + this.stop(); + this.setCellValues([]); + }, + + step: function () { + this.session.modify(this.counter, function () { + this.count = 1; + }); + if (!this.stepping) { + this.session.assert(new Stepping()); + } + return this.session.matchUntilHalt(function (err) { + if (err) { + console.log(err); + } + }); + }, + + solve: function () { + this.session.modify(this.counter, function () { + this.count = Infinity; + }); + if (this.stepping) { + this.session.retract(this.stepping); + } + return this.session.match(function (err) { + if (err) { + console.log(err); + } + }); + }, + + setCellValue: function setCellValue(cell) { + cell.el.text(cell.value ? cell.value: ""); + return cell; + }, + + create: function () { + var grid; + (grid = $("#grid")).empty(); + var rows = this.rows, cols = this.cols, sqrs = this.sqrs, session = this.session; + for (var i = 0; i < 9; i++) { + session.assert(i + 1); + rows[i] = new CellRow(i); + cols[i] = new CellCol(i); + } + + var cells = this.cells = [], iCol; + for (var iRow = 0; iRow < 9; iRow++) { + var rowDom = $("
      ").addClass("row").appendTo(grid); + cells[iRow] = []; + for (iCol = 0; iCol < 9; iCol++) { + var cell = cells[iRow][iCol] = new Cell(); + cell.el = $("
      ").appendTo(rowDom); + rows[iRow].addCell(cell); + cols[iCol].addCell(cell); + } + } + + for (i = 0; i < 3; i++) { + sqrs[i] = []; + for (var j = 0; j < 3; j++) { + sqrs[i][j] = new CellSqr(rows[i * 3], rows[i * 3 + 1], rows[i * 3 + 2], + cols[j * 3], cols[j * 3 + 1], cols[j * 3 + 2]); + } + } + + for (iRow = 0; iRow < 9; iRow++) { + for (iCol = 0; iCol < 9; iCol++) { + session.assert(cells[iRow][iCol].makeReferences(rows[iRow], cols[iCol], sqrs[Math.floor(iRow / 3)][Math.floor(iCol / 3)])); + } + session.assert(rows[iRow]); + session.assert(cols[iRow]); + session.assert(sqrs[Math.floor(iRow / 3)][iRow % 3]); + } + return this; + }, + + setCellValues: function (cellValues) { + this.stop(); + var session = (this.session = this.statsListener.listen(this.flow.getSession())) + .on("set-value", this.setCellValue); + + var s000 = new Setting(0, 0, 0); + this.session.assert(s000); + this.create(); + + var initial = 0; + for (var iRow = 0; iRow < 9; iRow++) { + var row = cellValues[iRow] || []; + for (var iCol = 0; iCol < 9; iCol++) { + var value = row[iCol] || null; + if (value) { + session.assert(new Setting(iRow, iCol, value)); + initial++; + //console.log(initial); + } + } + } + var counter = this.counter = new Counter(initial); + this.session.assert(counter); + this.session.retract(s000); + return this.session.matchUntilHalt(function (err) { + if (err) { + console.log(err); + } + this.dumpGrid(); + }.bind(this)); + }, + + dumpGrid: function () { + var cells = this.cells; + var print = [" "]; + for (var iCol = 0; iCol < 9; iCol++) { + print.push("Col: " + iCol + " "); + } + console.log(print.join("")); + for (var iRow = 0; iRow < 9; iRow++) { + print = ["Row " + (iRow) + ": "]; + for (iCol = 0; iCol < 9; iCol++) { + if (cells[iRow][iCol].value !== null) { + print.push(" --- " + cells[iRow][iCol].value + " --- "); + } else { + var perms = cells[iRow][iCol].free, sb = []; + for (var i = 1; i <= 9; i++) { + if (perms.indexOf(i) !== -1) { + sb.push(i); + } else { + sb.push(' '); + } + } + print.push(" % " + sb.join("")); + } + } + console.log(print.join("")); + } + }, + + setInvalidCellValue: function setCellValue(cell) { + cell.el.addClass("error"); + return cell; + }, + + validate: function () { + this.session.assert("validate"); + return this.session.focus("validate") + .on("invalid", this.setInvalidCellValue) + .matchUntilHalt(); + } + + } + }); + + this.Sudoku = Sudoku; +}).call(this); + + + + + + + + + + diff --git a/docs/examples/browser/src/sudokuPatterns.js b/docs/examples/browser/src/sudokuPatterns.js new file mode 100644 index 0000000..c73a45c --- /dev/null +++ b/docs/examples/browser/src/sudokuPatterns.js @@ -0,0 +1,90 @@ +(function () { + + this.sudokuExamples = { + Simple: [ + [null, 5, 6, 8, null, 1, 9, 4, null], + [9, null, null, 6, null, 5, null, null, 3], + [7, null, null, 4, 9, 3, null, null, 8], + [8, 9, 7, null, 4, null, 6, 3, 5], + [null, null, 3, 9, null, 6, 8, null, null], + [4, 6, 5, null, 8, null, 2, 9, 1], + [5, null, null, 2, 6, 9, null, null, 7], + [6, null, null, 5, null, 4, null, null, 9], + [null, 4, 9, 7, null, 8, 3, 5, null] + ], + + Medium: [ + [8, 4, 7, null, null, null, 2, 5, 6], + [5, null, null, null, 8, null, null, null, 4], + [2, null, null, null, 7, null, null, null, 8], + [null, null, null, 3, null, 8, null, null, null], + [null, 5, 1, null, null, null, 8, 7, 2], + [null, null, null, 5, null, 7, null, null, null], + [4, null, null, null, 5, null, null, null, 7], + [6, null, null, null, 3, null, null, null, 9], + [1, 3, 2, null, null, null, 4, 8, 5] + ], + + "Hard 1": [ + [null, null, null, null, 5, 1, null, 8, null], + [null, 8, null, null, 4, null, null, null, 5], + [null, null, 3, null, null, null, 2, null, null], + [null, null, null, null, 6, null, null, null, 9], + [6, 7, null, 4, null, 9, null, 1, 3], + [8, null, null, null, 3, null, null, null, null], + [null, null, 2, null, null, null, 4, null, null], + [5, null, null, null, 9, null, null, 2, null], + [null, 9, null, 7, 1, null, null, null, null] + ], + + "Hard 2": [ + [null, null, null, 6, null, null, 1, null, null], + [null, null, null, null, null, 5, null, null, 6], + [5, null, 7, null, null, null, 2, 3, null], + [null, 8, null, 9, null, 7, null, null, null], + [9, 3, null, null, null, null, null, 6, 7], + [null, null, null, 4, null, 6, null, 1, null], + [null, 7, 4, null, null, null, 9, null, 1], + [8, null, null, 7, null, null, null, null, null], + [null, null, 3, null, null, 8, null, null, null] + ], + + "Hard 3": [ + [null, 8, null, null, null, 6, null, null, 5], + [2, null, null, null, null, null, 4, 8, null], + [null, null, 9, null, null, 8, null, 1, null], + [null, null, null, null, 8, null, 1, null, 2], + [null, null, null, 3, null, 1, null, null, null], + [6, null, 1, null, 9, null, null, null, null], + [null, 9, null, 4, null, null, 8, null, null], + [null, 7, 6, null, null, null, null, null, 3], + [1, null, null, 7, null, null, null, 5, null] + ], + + "Hard 4": [ + [null, null, null, null, null, 4, null, 9, 5], + [6, 7, null, 5, null, null, null, 1, null], + [null, null, null, 6, null, 9, null, null, null], + [null, 2, null, null, null, null, 4, null, null], + [8, 1, null, null, null, null, null, 7, 2], + [null, null, 7, null, null, null, null, 8, null], + [null, null, null, 3, null, 5, null, null, null], + [null, 6, null, null, null, 1, null, 5, 8], + [7, 3, null, 9, null, null, null, null, null] + ], + + "Broken": [ + [5, null, null, null, null, 4, null, 9, 5], + [6, 7, null, 5, null, null, null, 1, null], + [null, null, null, 6, null, 9, null, null, null], + [null, 2, null, null, null, null, 4, null, null], + [8, 1, null, null, null, null, null, 7, 2], + [null, null, 7, null, null, null, null, 8, null], + [8, null, null, 3, null, 5, null, null, null], + [null, 6, null, null, null, 1, null, 5, 8], + [7, 3, null, 9, null, null, null, null, null] + ] + + }; + +}).call(this); \ No newline at end of file diff --git a/docs/examples/browser/sudoku.html b/docs/examples/browser/sudoku.html new file mode 100644 index 0000000..81afdba --- /dev/null +++ b/docs/examples/browser/sudoku.html @@ -0,0 +1,146 @@ + + + + + + Sudoku + + + + + + +
      +
      +

      Sudoku

      + +
      + + + + + + +
      +
      +
      +
      + +
      +
      +
      + + + + + + + + + + + + + + + + + + + + diff --git a/docs/index.html b/docs/index.html index 1531906..6930902 100644 --- a/docs/index.html +++ b/docs/index.html @@ -191,7 +191,12 @@

      Usage

    • Flows -

      The examples and tests are a -great place to get started. You can ask your questions on the Nools Google group.

      +

      Resources

      +

      Defining a flow

      When using nools you define a flow which acts as a container for rules that can later be used to get @@ -375,13 +389,18 @@

      Working with a session

      Working with facts

      Facts are items that the rules should try to match.

      -

      To add facts to the session use assert method.

      +

      +

      Assert

      +

      To add facts to the session use assert method.

      session.assert(new Message("hello"));
 session.assert(new Message("hello world"));
 session.assert(new Message("goodbye"));

      As a convenience any object passed into getSession will also be asserted.

      +

      Note assert is typically used pre engine execution and during the execution of the rules.

      flow.getSession(new Message("hello"), new Message("hello world"), new Message("goodbye"));
      -

      To retract facts from the session use the retract method.

      +

      +

      Retract

      +

      To remove facts from the session use the retract method.

      var m = new Message("hello");
 
 //assert the fact into the engine
@@ -389,7 +408,10 @@ 
      Working with facts
      
 
 //remove the fact from the engine
 session.retract(m);
      -

      To modify a fact use the modify method.

      +

      Note retract is typically used during the execution of the rules.

      +

      +

      Modify

      +

      To modify a fact use the modify method.

      Note modify will not work with immutable objects (i.e. strings). 

      
 var m = new Message("hello");
@@ -399,8 +421,7 @@ 
      Working with facts
      
 m.message = "hello goodbye";
 
 session.modify(m);
      -

      assert is typically used pre engine execution and during the execution of the rules.

      -

      modify and retract are typically used during the execution of the rules.

      +

      Note modify is typically used during the execution of the rules.

      Firing the rules

      When you get a session from a flow no rules will be fired until the match method is called.

      @@ -771,6 +792,38 @@

      Salience

      this.rule("Hello1", {salience: 10}, [Message, "m", "m.name == 'Hello'"], function (facts) { }); +

      Or using the DSL

      +
      rule Hello4 {
+    salience: 7;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}
+
+rule Hello3 {
+    salience: 8;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}
+
+rule Hello2 {
+    salience: 9;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}
+
+rule Hello1 {
+    salience: 10;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}

      In the above flow we define four rules each with a different salience, when a single message is asserted they will fire in order of salience (highest to lowest).

      var fired = [];
 flow1
@@ -916,6 +969,75 @@ 
      Constraints
      
 
    • Reference(optional) - An object where the keys are properties on the current object, and values are aliases to use. The alias may be used in succeeding patterns.
      
 
      • 
 
+
      
+
      Not Constraint
      
+
      The not constraint allow you to check that particular fact does not exist.
      
+
      
+[
+    [Number, "n1"],
+    ["not", Number, "n2", "n1 > n2"]
+]
      
+
      Or using the DSL.
      
+
      
+when {
+    n1: Number;
+    not(n2: Number n1 > n2);
+}
      
+
      The previous example will check that for all numbers in the workingMemory there is not one that is greater than n1.
      
+
      
+
      Or Constraint
      
+
      The or constraint can be used to check for either one fact or another.
      
+
      
+[
+    ["or",
+        [String, "s", "s == 'hello'"],
+        [String, "s", "s == 'world'"]
+    ]
+]
      
+
      Using the DSL.
      
+
      when {
+    or(
+        s : String s == 'hello',
+        s : String s == 'world'
+    );
+}
      
+
      The previous example will evaluate to true if you have a string in workingMemory that equals hello or `world.
      
+
      
+
      From Constraint
      
+
      The from modifier allows for the checking of facts that are not necessarily in the workingMemory but instead exist as a property on a fact.
      
+
      [
+    [Person, "p"],
+    [Address, "a", "a.zipcode == 88847", "from p.address"],
+    [String, "first", "first == 'bob'", "from p.firstName"],
+    [String, "last", "last == 'yukon'", "from p.lastName"]
+]
      
+
      Or using the DSL.
      
+
      when {
+    p: Person:
+    a: Address a.zipcode == 88847 from p.address;
+    first: String first == 'bob' from p.firstName;
+    last: String last == 'yukon' from p.lastName;
+}
      
+
      The above example will used the address, firstName and lastName from the person fact.
      
+
      You can also use the from modifier to check facts that create a graph.
      
+
      For example assume the person object from above has friends that are also of type Person.
      
+
      [
+    [Person, "p"],
+    [Person, "friend", "friend.firstName != p.firstName", "from p.friends"],
+    [String, "first", "first =~ /^a/", "from friend.firstName"]
+]
      
+
      Or using the DSL.
      
+
      when {
+    p: Person;
+    friend: Person friend.firstName != p.firstName;
+    first: String first =~ /^a/ from friend.firstName;
+}
      
+
      The above example will pull the friend fact from the friends array property on fact p, and first from the friend's firstName.
      
+
      You could achieve the same thing using the following code if you assert all friends into working memory.
      
+
      when {
+    p: Person;
+    friend: Person friend in p.friends && friend.firstName != p.firstName && p.firstName =~ /^a/;
+}
      
 
      
 
      Action
      
 
      The action is a function that should be fired when all patterns in the rule match. The action is called in the scope
diff --git a/docs/nools.js b/docs/nools.js
index 945c126..f0d5d62 100644
--- a/docs/nools.js
+++ b/docs/nools.js
@@ -1,10 +1,10 @@
-/*! nools - v0.1.14 - 2013-10-02
+/*! nools - v0.2.0 - 2013-10-14
 * http://c2fo.github.com/nools
 * Copyright (c) 2013 Doug Martin (http://c2fo.com); Licensed  */
-!function a(b,c,d){function e(g,h){if(!c[g]){if(!b[g]){var i="function"==typeof require&&require;if(!h&&i)return i(g,!0);if(f)return f(g,!0);throw new Error("Cannot find module '"+g+"'")}var j=c[g]={exports:{}};b[g][0].call(j.exports,function(a){var c=b[g][1][a];return e(c?c:a)},j,j.exports,a,b,c,d)}return c[g].exports}for(var f="function"==typeof require&&require,g=0;gf&&j>f&&f++;);c=g[f]-h[f],c||(c=i-j)}return c||(c=a.recency-b.recency),c>0?1:-1},j=e({instance:{constructor:function(){this.memory={},this.memoryValues=new g},clear:function(){this.memoryValues.clear(),this.memory={},this.memory.length=this.memoryValues.length=0},get:function(a){var b=this.memory[a.id];return b?b.data:[]},remove:function(a){for(var b,c,e,f,g=a.match.facts,h=g.length,i=this.memoryValues,j=this.memory,k=-1;++k-1;)c=h[i],f.remove(c),e.remove(c),g.remove(c);h.length=0},retract:function(a,b){var c=this.rules[a.name],d=c.tree,e=c.factTable,f=this.getAgendaGroup(a.rule.agendaGroup);d.traverse(d.__root,k,function(a){b(a)&&(e.remove(a),f.remove(a),d.remove(a))})},insert:function(a,b){var c=this.rules[a.name],d=a.rule,e=d.agendaGroup;c.tree.insert(b),this.getAgendaGroup(e).insert(b),e&&d.autoFocus&&this.setFocus(e),c.factTable.insert(b)},dispose:function(){for(var a in this.agendaGroups)this.agendaGroups[a].clear();var b=this.rules;for(a in b)a in b&&(b[a].tree.clear(),b[a].factTable.clear());this.rules={}}}})},{"./extended":11,events:47}],4:[function(require,module,exports){"use strict";var extd=require("../extended"),forEach=extd.forEach,isString=extd.isString;exports.modifiers=["assert","modify","retract","emit","halt","focus"];var createFunction=function(body,defined,scope,scopeNames,definedNames){var declares=[];forEach(definedNames,function(a){-1!==body.indexOf(a)&&declares.push("var "+a+"= defined."+a+";")}),forEach(scopeNames,function(a){-1!==body.indexOf(a)&&declares.push("var "+a+"= scope."+a+";")}),body=["((function(){",declares.join(""),"\n	return ",body,"\n})())"].join("");try{return eval(body)}catch(e){throw new Error("Invalid action : "+body+"\n"+e.message)}},createDefined=function(){var a=function(a){a=isString(a)?new Function("return "+a+";")():a;var b=a.hasOwnProperty("constructor")&&"function"==typeof a.constructor?a.constructor:function(b){b=b||{};for(var c in b)c in a&&(this[c]=b[c])},c=b.prototype;for(var d in a)c[d]=a[d];return b};return function(b){return a(b.properties)}}();exports.createFunction=createFunction,exports.createDefined=createDefined},{"../extended":11}],5:[function(a,b,c){var d=a("__browserify_Buffer").Buffer,e=a("../extended"),f=a("../parser"),g=a("../constraintMatcher.js"),h=e.indexOf,i=e.forEach,j=e.removeDuplicates,k=e.map,l=e.hash,m=l.keys,n=e.merge,o=a("../rule"),p=a("./common"),q=p.createDefined,r=p.createFunction,s=function(a,b,c,d){var f=[];i(b,function(b){-1!==a.indexOf(b)&&f.push("var "+b+"= facts."+b+";")}),e(c).keys().forEach(function(b){-1!==a.indexOf(b)&&f.push("var "+b+"= defined."+b+";")}),e(d).keys().forEach(function(b){-1!==a.indexOf(b)&&f.push("var "+b+"= scope."+b+";")});var g=["facts","flow"];/next\(.*\)/.test(a)&&g.push("next"),a="with(flow){"+f.join("")+a+"}";try{return new Function("defined, scope","return "+new Function(g.join(","),a).toString())(c,d)}catch(h){throw new Error("Invalid action : "+a+"\n"+h.message)}},t=function(){var a=function(a,b,c,d,j){var k=[],l=a[0],m=a[1],n=a[2],o=a[3];if(e.isHash(n)&&(o=n,n=null),!l||!(l=d[l]))throw new Error("Invalid class "+a[0]+" for rule "+j);if(k.push(l),k.push(m,n,o),c.push(k),b.push(m),n&&i(g.getIdentifiers(f.parseConstraint(n)),function(a){b.push(a)}),e.isObject(o))for(var p in o){var q=o[p];-1===h(b,q)&&b.push(q)}};return function(b,c,d){var f=b.name;if(e.isEmpty(b))throw new Error("Rule is empty");var g=b.options||{};g.scope=d;var h=b.constraints||[],k=h.length;k||(h=["true"]);var l=b.action;if(e.isUndefined(l))throw new Error("No action was defined for rule "+f);var m=[],n=[];return e(h).forEach(function(b){if(b.length){var d=b[0];if("not"===d){var e=[];b.shift(),a(b,n,e,c,f);var g=e[0];g.unshift(d),m.push(g)}else if("or"===d){var h=[d];b.shift(),i(b,function(b){a(b,n,h,c,f)}),m.push(h)}else a(b,n,m,c,f),n=j(n)}}),o.createRule(f,g,m,s(l,n,c,d))}}();c.parse=function(a,b){return f.parseRuleSet(a,b)},c.compile=function(a,b,c,f){e.isFunction(b)?(c=b,b={}):(b=b||{},c=null);var g=a.name||b.name;if(!g)throw new Error("Name must be present in JSON or options");var h=new f(g),j=n({Array:Array,String:String,Number:Number,Boolean:Boolean,RegExp:RegExp,Date:Date,Object:Object},b.define||{});"undefined"!=typeof d&&(j.Buffer=d);var l=n({console:console},b.scope);i(a.define,function(a){j[a.name]=q(a)}),e(j).forEach(function(a,b){h.addDefined(b,a)});var o=e(a.scope).pluck("name").union(e(l).keys().value()).value(),p=k(m(j),function(a){return a});i(a.scope,function(a){l[a.name]=r(a.body,j,l,o,p)});var s=a.rules;return s.length&&i(s,function(a){h.__rules=h.__rules.concat(t(a,j,l))}),c&&c.call(h,h),h},c.transpile=a("./transpile").transpile},{"../constraintMatcher.js":8,"../extended":11,"../parser":31,"../rule":36,"./common":4,"./transpile":6,__browserify_Buffer:50}],6:[function(a,b,c){function d(a){a=l(a)?new Function("return "+a+";")():a;var b,c=["(function(){"];a.hasOwnProperty("constructor")&&"function"==typeof a.constructor?c.push("var Defined = "+a.constructor.toString()+";"):c.push("var Defined = function(opts){ for(var i in opts){if(opts.hasOwnProperty(i)){this[i] = opts[i];}}};"),c.push("var proto = Defined.prototype;");for(var d in a)a.hasOwnProperty(d)&&(b=a[d],c.push("proto."+d+" = "+(h.isFunction(b)?b.toString():h.format("%j",b))+";"));return c.push("return Defined;"),c.push("}())"),c.join("")}function e(a,b,c,d){var e=[];i(b,function(b){-1!==a.indexOf(b)&&e.push("var "+b+"= facts."+b+";")}),h(c).keys().forEach(function(b){-1!==a.indexOf(b)&&e.push("var "+b+"= defined."+b+";")}),h(d).keys().forEach(function(b){-1!==a.indexOf(b)&&e.push("var "+b+"= scope."+b+";")});var f=["facts","flow"];/next\(.*\)/.test(a)&&f.push("next"),a=e.join("")+a;try{return["function(",f.join(","),"){with(flow){",a,"}}"].join("")}catch(g){throw new Error("Invalid action : "+a+"\n"+g.message)}}function f(a,b){a=a.slice(0);var c=[];if("or"===a[0])return c.push('["'+a.shift()+'"'),c.push(h.map(a,function(a){return f(a,b)}).join(",")+"]"),c;if("not"===a[0]&&c.push('"',a.shift(),'", '),b.push(a[1]),c.push(a[0],', 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j=k({console:console},b.scope);return c.push(["return nools.flow('",b.name,"', function(){"].join("")),c.push(h(a.define||[]).map(function(a){var b=a.name;return a[b]={},["var",b,"= defined."+b,"= this.addDefined('"+b+"',",d(a.properties)+");"].join(" ")}).value().join("\n")),c.push(h(a.scope||[]).map(function(a){var b=a.name;return j[b]={},["var",b,"= scope."+b,"= ",a.body,";"].join(" ")}).value().join("\n")),c.push("scope.console = console;\n"),c.push(h(a.rules||[]).map(function(a){var b=[],c=["this.rule('",a.name.replace(/'/g,"\\'"),"'"],d=h.merge(a.options||{},{scope:"scope"});return c.push(",",h.format("%j",[d]).replace(/(:"scope")/,":scope")),a.constraints&&!h.isEmpty(a.constraints)&&(c.push(", ["),c.push(h(a.constraints).map(function(a){return 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g(a,this._static)&&this.constraint===a.constraint}}}).as(c,"ObjectConstraint"),j.extend({instance:{constructor:function(a,b){this._super(["equality",a]),b=b||{},this.pattern=b.pattern,this._matcher=d.getMatcher(a,b.scope||{})},assert:function(a){return this._matcher(a)}}}).as(c,"EqualityConstraint"),j.extend({instance:{constructor:function(){this._super(["equality",[!0]])},equal:function(a){return g(a,this._static)&&this.get("alias")===a.get("alias")},assert:function(){return!0}}}).as(c,"TrueConstraint"),j.extend({instance:{constructor:function(a,b){this.cache={},this._super(["reference",a]),b=b||{},this.values=[],this.pattern=b.pattern,this._options=b,this._matcher=d.getMatcher(a,b.scope||{})},assert:function(a){try{return this._matcher(a)}catch(b){throw new Error("Error with evaluating pattern "+this.pattern+" "+b.message)}},merge:function(a){var b=this;return a instanceof this._static&&(b=new 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c=!1;return a===b?c=!0:a[2]===b[2]&&(c=-1!==i(["string","number","boolean","regexp","identifier","null"],a[2])?a[0]===b[0]:"unary"===a[2]||"logicalNot"===a[2]?this.equal(a[0],b[0]):this.equal(a[0],b[0])&&this.equal(a[1],b[1])),c},getIdentifiers:function(a){var b=[],c=a[2];if("identifier"===c)return[a[0]];if("function"===c)b=b.concat(this.getIdentifiers(a[0])).concat(this.getIdentifiers(a[1]));else if("string"!==c&&"number"!==c&&"boolean"!==c&&"regexp"!==c&&"unary"!==c&&"unary"!==c)if("prop"===c){if(b=b.concat(this.getIdentifiers(a[0])),a[1])for(var d=a[1];e(d);){if("function"===d[2]){b=b.concat(this.getIdentifiers(d[1]));break}d=d[1]}}else a[0]&&(b=b.concat(this.getIdentifiers(a[0]))),a[1]&&(b=b.concat(this.getIdentifiers(a[1])));return k(b)},toConstraints:function(a,b){var c=[],d=b.alias,e=b.scope||{},f=a[2];return"and"===f?c=c.concat(this.toConstraints(a[0],b)).concat(this.toConstraints(a[1],b)):("composite"===f||"or"===f||"lt"===f||"gt"===f||"lte"===f||"gte"===f||"like"===f||"notLike"===f||"eq"===f||"neq"===f||"in"===f||"notIn"===f||"prop"===f||"propLookup"===f||"function"===f||"logicalNot"===f)&&(g(this.getIdentifiers(a),function(a){return!(a===d||a in m||a in e)})?c.push(new l.ReferenceConstraint(a,b)):c.push(new l.EqualityConstraint(a,b))),c},parse:function(a){return this[a[2]](a[0],a[1])},composite:function(a){return this.parse(a)},and:function(a,b){return["(",this.parse(a),"&&",this.parse(b),")"].join(" ")},or:function(a,b){return["(",this.parse(a),"||",this.parse(b),")"].join(" 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")},like:function(a,b){return[this.parse(b),".test(",this.parse(a),")"].join("")},notLike:function(a,b){return["!",this.parse(b),".test(",this.parse(a),")"].join("")},eq:function(a,b){return[this.parse(a),"===",this.parse(b)].join(" ")},neq:function(a,b){return[this.parse(a),"!==",this.parse(b)].join(" ")},"in":function(a,b){return["(indexOf(",this.parse(b),",",this.parse(a),")) != -1"].join("")},notIn:function(a,b){return["(indexOf(",this.parse(b),",",this.parse(a),")) == -1"].join("")},arguments:function(a,b){var c=[];return a&&c.push(this.parse(a)),b&&c.push(this.parse(b)),c.join(",")},array:function(a){var b=[];return a?(b=this.parse(a),e(b)?b:["[",b,"]"].join("")):["[",b.join(","),"]"].join("")},"function":function(a,b){var c=this.parse(b);return[this.parse(a),"(",c,")"].join("")},string:function(a){return"'"+a+"'"},number:function(a){return a},"boolean":function(a){return a},regexp:function(a){return a},identifier:function(a){return 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19:[2,16],20:[2,16],21:[2,16],22:[2,16],24:[2,16],25:[2,16],26:[2,16],27:[2,16],34:[2,16],36:[2,16],46:[2,16]},{5:[2,17],17:[1,48],19:[2,17],20:[2,17],21:[2,17],22:[2,17],24:[2,17],25:[2,17],26:[2,17],27:[2,17],34:[2,17],36:[2,17],46:[2,17]},{5:[2,18],17:[1,48],19:[2,18],20:[2,18],21:[2,18],22:[2,18],24:[2,18],25:[2,18],26:[2,18],27:[2,18],34:[2,18],36:[2,18],46:[2,18]},{5:[2,37],8:[2,37],11:[2,37],12:[2,37],13:[2,37],15:[2,37],17:[2,37],19:[2,37],20:[2,37],21:[2,37],22:[2,37],24:[2,37],25:[2,37],26:[2,37],27:[2,37],29:[2,37],31:[2,37],34:[2,37],36:[2,37],38:[2,37],41:[2,37],42:[2,37],44:[2,37],45:[2,37],46:[2,37]},{44:[1,88]},{41:[1,44],42:[1,45],44:[1,89],45:[1,46]},{5:[2,40],8:[2,40],11:[2,40],12:[2,40],13:[2,40],15:[2,40],17:[2,40],19:[2,40],20:[2,40],21:[2,40],22:[2,40],24:[2,40],25:[2,40],26:[2,40],27:[2,40],29:[2,40],31:[2,40],34:[2,40],36:[2,40],38:[2,40],41:[2,40],42:[2,40],44:[2,40],45:[2,40],46:[2,40]},{38:[1,82],46:[1,90]},{5:[2,56],8:[2,56],11:[2,56],12:[2,56],13:[2,56],15:[2,56],17:[2,56],19:[2,56],20:[2,56],21:[2,56],22:[2,56],24:[2,56],25:[2,56],26:[2,56],27:[2,56],29:[2,56],31:[2,56],34:[2,56],36:[2,56],38:[2,56],44:[2,56],46:[2,56]},{5:[2,13],8:[1,53],15:[1,52],17:[2,13],19:[2,13],20:[2,13],21:[2,13],22:[2,13],24:[2,13],25:[2,13],26:[2,13],27:[2,13],34:[2,13],36:[2,13],46:[2,13]},{5:[2,48],8:[2,48],11:[2,48],12:[2,48],13:[2,48],15:[2,48],17:[2,48],19:[2,48],20:[2,48],21:[2,48],22:[2,48],24:[2,48],25:[2,48],26:[2,48],27:[2,48],29:[2,48],31:[2,48],34:[2,48],36:[2,48],38:[2,48],44:[2,48],46:[2,48]},{7:91,30:15,32:14,39:23,40:[1,26],42:[1,24],43:9,45:[1,16],47:[1,18],48:10,49:[1,19],50:11,51:[1,20],52:12,53:[1,21],54:13,55:[1,22]},{5:[2,10],8:[2,10],11:[1,54],12:[1,55],13:[1,56],15:[2,10],17:[2,10],19:[2,10],20:[2,10],21:[2,10],22:[2,10],24:[2,10],25:[2,10],26:[2,10],27:[2,10],34:[2,10],36:[2,10],46:[2,10]},{5:[2,11],8:[2,11],11:[1,54],12:[1,55],13:[1,56],15:[2,11],17:[2,11],19:[2,11],20:[2,11],21:[2,11],22:[2,11],24:[2,11],25:[2,11],26:[2,11],27:[2,11],34:[2,11],36:[2,11],46:[2,11]},{5:[2,6],8:[2,6],11:[2,6],12:[2,6],13:[2,6],15:[2,6],17:[2,6],19:[2,6],20:[2,6],21:[2,6],22:[2,6],24:[2,6],25:[2,6],26:[2,6],27:[2,6],34:[2,6],36:[2,6],46:[2,6]},{5:[2,7],8:[2,7],11:[2,7],12:[2,7],13:[2,7],15:[2,7],17:[2,7],19:[2,7],20:[2,7],21:[2,7],22:[2,7],24:[2,7],25:[2,7],26:[2,7],27:[2,7],34:[2,7],36:[2,7],46:[2,7]},{5:[2,8],8:[2,8],11:[2,8],12:[2,8],13:[2,8],15:[2,8],17:[2,8],19:[2,8],20:[2,8],21:[2,8],22:[2,8],24:[2,8],25:[2,8],26:[2,8],27:[2,8],34:[2,8],36:[2,8],46:[2,8]},{5:[2,38],8:[2,38],11:[2,38],12:[2,38],13:[2,38],15:[2,38],17:[2,38],19:[2,38],20:[2,38],21:[2,38],22:[2,38],24:[2,38],25:[2,38],26:[2,38],27:[2,38],29:[2,38],31:[2,38],34:[2,38],36:[2,38],38:[2,38],41:[2,38],42:[2,38],44:[2,38],45:[2,38],46:[2,38]},{5:[2,39],8:[2,39],11:[2,39],12:[2,39],13:[2,39],15:[2,39],17:[2,39],19:[2,39],20:[2,39],21:[2,39],22:[2,39],24:[2,39],25:[2,39],26:[2,39],27:[2,39],29:[2,39],31:[2,39],34:[2,39],36:[2,39],38:[2,39],41:[2,39],42:[2,39],44:[2,39],45:[2,39],46:[2,39]},{5:[2,41],8:[2,41],11:[2,41],12:[2,41],13:[2,41],15:[2,41],17:[2,41],19:[2,41],20:[2,41],21:[2,41],22:[2,41],24:[2,41],25:[2,41],26:[2,41],27:[2,41],29:[2,41],31:[2,41],34:[2,41],36:[2,41],38:[2,41],41:[2,41],42:[2,41],44:[2,41],45:[2,41],46:[2,41]},{38:[2,34],44:[2,34],46:[2,34]}],defaultActions:{31:[2,1]},parseError:function(a,b){if(!b.recoverable)throw new Error(a);this.trace(a)},parse:function(a){function b(){var a;return a=c.lexer.lex()||m,"number"!=typeof a&&(a=c.symbols_[a]||a),a}var c=this,d=[0],e=[null],f=[],g=this.table,h="",i=0,j=0,k=0,l=2,m=1;this.lexer.setInput(a),this.lexer.yy=this.yy,this.yy.lexer=this.lexer,this.yy.parser=this,"undefined"==typeof this.lexer.yylloc&&(this.lexer.yylloc={});var n=this.lexer.yylloc;f.push(n);var o=this.lexer.options&&this.lexer.options.ranges;this.parseError="function"==typeof this.yy.parseError?this.yy.parseError:Object.getPrototypeOf(this).parseError;for(var p,q,r,s,t,u,v,w,x,y={};;){if(r=d[d.length-1],this.defaultActions[r]?s=this.defaultActions[r]:((null===p||"undefined"==typeof p)&&(p=b()),s=g[r]&&g[r][p]),"undefined"==typeof s||!s.length||!s[0]){var z="";x=[];for(u in g[r])this.terminals_[u]&&u>l&&x.push("'"+this.terminals_[u]+"'");z=this.lexer.showPosition?"Parse error on line "+(i+1)+":\n"+this.lexer.showPosition()+"\nExpecting "+x.join(", ")+", got '"+(this.terminals_[p]||p)+"'":"Parse error on line "+(i+1)+": Unexpected "+(p==m?"end of input":"'"+(this.terminals_[p]||p)+"'"),this.parseError(z,{text:this.lexer.match,token:this.terminals_[p]||p,line:this.lexer.yylineno,loc:n,expected:x})}if(s[0]instanceof Array&&s.length>1)throw new Error("Parse Error: multiple actions possible at state: "+r+", token: "+p);switch(s[0]){case 1:d.push(p),e.push(this.lexer.yytext),f.push(this.lexer.yylloc),d.push(s[1]),p=null,q?(p=q,q=null):(j=this.lexer.yyleng,h=this.lexer.yytext,i=this.lexer.yylineno,n=this.lexer.yylloc,k>0&&k--);break;case 2:if(v=this.productions_[s[1]][1],y.$=e[e.length-v],y._$={first_line:f[f.length-(v||1)].first_line,last_line:f[f.length-1].last_line,first_column:f[f.length-(v||1)].first_column,last_column:f[f.length-1].last_column},o&&(y._$.range=[f[f.length-(v||1)].range[0],f[f.length-1].range[1]]),t=this.performAction.call(y,h,j,i,this.yy,s[1],e,f),"undefined"!=typeof t)return t;v&&(d=d.slice(0,2*-1*v),e=e.slice(0,-1*v),f=f.slice(0,-1*v)),d.push(this.productions_[s[1]][0]),e.push(y.$),f.push(y._$),w=g[d[d.length-2]][d[d.length-1]],d.push(w);break;case 3:return!0}}return!0}},c=function(){var a={EOF:1,parseError:function(a,b){if(!this.yy.parser)throw new Error(a);this.yy.parser.parseError(a,b)},setInput:function(a){return this._input=a,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},input:function(){var a=this._input[0];this.yytext+=a,this.yyleng++,this.offset++,this.match+=a,this.matched+=a;var b=a.match(/(?:\r\n?|\n).*/g);return b?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),a},unput:function(a){var b=a.length,c=a.split(/(?:\r\n?|\n)/g);this._input=a+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-b-1),this.offset-=b;var d=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),c.length-1&&(this.yylineno-=c.length-1);var e=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:c?(c.length===d.length?this.yylloc.first_column:0)+d[d.length-c.length].length-c[0].length:this.yylloc.first_column-b},this.options.ranges&&(this.yylloc.range=[e[0],e[0]+this.yyleng-b]),this.yyleng=this.yytext.length,this},more:function(){return this._more=!0,this},reject:function(){return this.options.backtrack_lexer?(this._backtrack=!0,this):this.parseError("Lexical error on line "+(this.yylineno+1)+". You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true).\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},less:function(a){this.unput(this.match.slice(a))},pastInput:function(){var a=this.matched.substr(0,this.matched.length-this.match.length);return(a.length>20?"...":"")+a.substr(-20).replace(/\n/g,"")},upcomingInput:function(){var a=this.match;return a.length<20&&(a+=this._input.substr(0,20-a.length)),(a.substr(0,20)+(a.length>20?"...":"")).replace(/\n/g,"")},showPosition:function(){var a=this.pastInput(),b=new Array(a.length+1).join("-");return a+this.upcomingInput()+"\n"+b+"^"},test_match:function(a,b){var c,d,e;if(this.options.backtrack_lexer&&(e={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(e.yylloc.range=this.yylloc.range.slice(0))),d=a[0].match(/(?:\r\n?|\n).*/g),d&&(this.yylineno+=d.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:d?d[d.length-1].length-d[d.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+a[0].length},this.yytext+=a[0],this.match+=a[0],this.matches=a,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(a[0].length),this.matched+=a[0],c=this.performAction.call(this,this.yy,this,b,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),c)return c;
-if(this._backtrack){for(var f in e)this[f]=e[f];return!1}return!1},next:function(){if(this.done)return this.EOF;this._input||(this.done=!0);var a,b,c,d;this._more||(this.yytext="",this.match="");for(var e=this._currentRules(),f=0;fb[0].length)){if(b=c,d=f,this.options.backtrack_lexer){if(a=this.test_match(c,e[f]),a!==!1)return a;if(this._backtrack){b=!1;continue}return!1}if(!this.options.flex)break}return b?(a=this.test_match(b,e[d]),a!==!1?a:!1):""===this._input?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+". Unrecognized text.\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},lex:function(){var a=this.next();return a?a:this.lex()},begin:function(a){this.conditionStack.push(a)},popState:function(){var a=this.conditionStack.length-1;return a>0?this.conditionStack.pop():this.conditionStack[0]},_currentRules:function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},topState:function(a){return a=this.conditionStack.length-1-Math.abs(a||0),a>=0?this.conditionStack[a]:"INITIAL"},pushState:function(a){this.begin(a)},stateStackSize:function(){return this.conditionStack.length},options:{},performAction:function(a,b,c,d){switch(c){case 0:return 29;case 1:return 31;case 2:return"from";case 3:return 24;case 4:return 25;case 5:return 21;case 6:return 19;case 7:return 22;case 8:return 20;case 9:return 26;case 10:return 27;case 11:return 34;case 12:return 36;case 13:return 55;case 14:return 53;case 15:break;case 16:return 49;case 17:return 47;case 18:return 47;case 19:return 40;case 20:return 51;case 21:return 41;case 22:return 11;case 23:return 12;case 24:return 13;case 25:return 38;case 26:return 8;case 27:return 26;case 28:return 27;case 29:return 24;case 30:return 24;case 31:return 25;case 32:return 25;case 33:return 21;case 34:return 22;case 35:return 20;case 36:return 19;case 37:return 34;case 38:return 36;case 39:return 15;case 40:return 17;case 41:return 45;case 42:return 44;case 43:return 42;case 44:return 46;case 45:return 9;case 46:return 5}},rules:[/^(?:\s+in\b)/,/^(?:\s+notIn\b)/,/^(?:\s+from\b)/,/^(?:\s+(eq|EQ)\b)/,/^(?:\s+(neq|NEQ)\b)/,/^(?:\s+(lte|LTE)\b)/,/^(?:\s+(lt|LT)\b)/,/^(?:\s+(gte|GTE)\b)/,/^(?:\s+(gt|GT)\b)/,/^(?:\s+(like|LIKE)\b)/,/^(?:\s+(notLike|NOT_LIKE)\b)/,/^(?:\s+(and|AND)\b)/,/^(?:\s+(or|OR)\b)/,/^(?:\s+null\b)/,/^(?:\s+(true|false)\b)/,/^(?:\s+)/,/^(?:-?[0-9]+(?:\.[0-9]+)?\b)/,/^(?:'[^']*')/,/^(?:"[^"]*")/,/^(?:([a-zA-Z_$][0-9a-zA-Z_$]*))/,/^(?:^\/((?![\s=])[^[\/\n\\]*(?:(?:\\[\s\S]|\[[^\]\n\\]*(?:\\[\s\S][^\]\n\\]*)*])[^[\/\n\\]*)*\/[imgy]{0,4})(?!\w))/,/^(?:\.)/,/^(?:\*)/,/^(?:\/)/,/^(?:\%)/,/^(?:,)/,/^(?:-)/,/^(?:=~)/,/^(?:!=~)/,/^(?:==)/,/^(?:===)/,/^(?:!=)/,/^(?:!==)/,/^(?:<=)/,/^(?:>=)/,/^(?:>)/,/^(?:<)/,/^(?:&&)/,/^(?:\|\|)/,/^(?:\+)/,/^(?:\^)/,/^(?:\()/,/^(?:\])/,/^(?:\[)/,/^(?:\))/,/^(?:!)/,/^(?:$)/],conditions:{INITIAL:{rules:[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46],inclusive:!0}}};return a}();return b.lexer=c,a.prototype=b,b.Parser=a,new a}();"undefined"!=typeof a&&"undefined"!=typeof c&&(c.parser=e,c.Parser=e.Parser,c.parse=function(){return e.parse.apply(e,arguments)},c.main=function(b){b[1]||(console.log("Usage: "+b[0]+" FILE"),d.exit(1));var e=a("fs").readFileSync(a("path").normalize(b[1]),"utf8");return c.parser.parse(e)},"undefined"!=typeof b&&a.main===b&&c.main(d.argv.slice(1)))},{__browserify_process:51,fs:48,path:49}],31:[function(a,b,c){!function(){"use strict";var b=a("./constraint/parser"),d=a("./nools/nool.parser");c.parseConstraint=function(a){try{return b.parse(a)}catch(c){throw new Error("Invalid expression '"+a+"'")}},c.parseRuleSet=function(a,b){return d.parse(a,b)}}()},{"./constraint/parser":30,"./nools/nool.parser":32}],32:[function(a,b,c){"use strict";var d=a("./tokens.js"),e=a("../../extended"),f=e.hash.keys,g=a("./util.js"),h=function(a,b,c){var d=a;a=a.replace(/\/\/(.*)[\n|\r|\r\n]/g,"").replace(/\n|\r|\r\n/g," ");for(var e,i=new RegExp("^("+f(b).join("|")+")");a&&-1!==(e=g.findNextTokenIndex(a));){a=a.substr(e);var j=a.match(i);if(null===j)throw new Error("Error parsing "+a);if(j=j[1],!(j in b))throw new Error("Unknown token"+j);try{a=b[j](a,c,h).replace(/^\s*|\s*$/g,"")}catch(k){throw new Error("Invalid "+j+" definition \n"+k.message+"; \nstarting at : "+d)}}};c.parse=function(a,b){var c={define:[],rules:[],scope:[],loaded:[],file:b};return h(a,d,c),c}},{"../../extended":11,"./tokens.js":33,"./util.js":34}],33:[function(require,module,exports){var process=require("__browserify_process"),utils=require("./util.js"),fs=require("fs"),indexOf=require("../../extended").indexOf,isWhiteSpace=function(a){return 0===a.replace(/[\s|\n|\r|\t]/g,"").length},ruleTokens={salience:function(){var a=/^(salience|priority)\s*:\s*(-?\d+)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=parseInt(d[2],10);if(isNaN(e))throw new Error("Invalid salience/priority "+d[2]);return c.options.priority=e,b.replace(d[0],"")}throw new Error("invalid format")}}(),agendaGroup:function(){var a=/^(agenda-group|agendaGroup)\s*:\s*([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid agenda-group "+d[2]);return c.options.agendaGroup=e.replace(/^["']|["']$/g,""),b.replace(d[0],"")}throw new Error("invalid format")}}(),autoFocus:function(){var a=/^(auto-focus|autoFocus)\s*:\s*(true|false)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid auto-focus "+d[2]);return c.options.autoFocus="true"===e?!0:!1,b.replace(d[0],"")}throw new Error("invalid format")}}(),"agenda-group":function(){return this.agendaGroup.apply(this,arguments)},"auto-focus":function(){return this.autoFocus.apply(this,arguments)},priority:function(){return this.salience.apply(this,arguments)},when:function(){var ruleRegExp=/^(\$?\w+) *: *(\w+)(.*)/,joinFunc=function(a,b){return"; "+b},constraintRegExp=/(\{ *(?:["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']? *(?:, *["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']?)*)+ *\})/,predicateExp=/^(\w+) *\((.*)\)$/m,parseRules=function(str){for(var rules=[],ruleLines=str.split(";"),l=ruleLines.length,ruleLine,i=0;l>i&&(ruleLine=ruleLines[i].replace(/^\s*|\s*$/g,"").replace(/\n/g,""));i++)if(!isWhiteSpace(ruleLine)){var rule=[];if(predicateExp.test(ruleLine)){var m=ruleLine.match(predicateExp),pred=m[1].replace(/^\s*|\s*$/g,"");if(rule.push(pred),ruleLine=m[2].replace(/^\s*|\s*$/g,""),"or"===pred){rule=rule.concat(parseRules(ruleLine.replace(/,\s*(\$?\w+\s*:)/g,joinFunc))),rules.push(rule);continue}}var parts=ruleLine.match(ruleRegExp);if(!parts||!parts.length)throw new Error("Invalid constraint "+ruleLine);rule.push(parts[2],parts[1]);var constraints=parts[3].replace(/^\s*|\s*$/g,""),hashParts=constraints.match(constraintRegExp);if(hashParts){var hash=hashParts[1],constraint=constraints.replace(hash,"");constraint&&rule.push(constraint.replace(/^\s*|\s*$/g,"")),hash&&rule.push(eval("("+hash.replace(/(\$?\w+)\s*:\s*(\$?\w+)/g,'"$1" : "$2"')+")"))}else constraints&&!isWhiteSpace(constraints)&&rule.push(constraints);rules.push(rule)}return rules};return function(a,b){var c=a.replace(/^when\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(d,""),b.constraints=parseRules(d.replace(/^\{\s*|\}\s*$/g,"")),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}(),then:function(){return function(a,b){if(b.action)throw new Error("action already defined for rule"+b.name);var c=a.replace(/^then\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");if(c=c.replace(d,""),b.action||(b.action=d.replace(/^\{\s*|\}\s*$/g,"")),!isWhiteSpace(c))throw new Error("Error parsing then block "+a);return c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}()},topLevelTokens={"/":function(a){return a.match(/^\/\*/)?a.replace(/\/\*.*?\*\//,""):a},define:function(a,b){var c=a.replace(/^define\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){d=d[1];var e=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(e,""),b.define.push({name:d,properties:"("+e+")"}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"import":function(a,b,c){if("undefined"!=typeof window)throw new Error("import cannot be used in a browser");var d=a.replace(/^import\s*/,"");if("("===utils.findNextToken(d)){var e=utils.getParamList(d);if(d=d.replace(e,"").replace(/^\s*|\s*$/g,""),";"===utils.findNextToken(d)&&(d=d.replace(/\s*;/,"")),e=e.replace(/[\(|\)]/g,"").split(","),1===e.length){if(e=utils.resolve(b.file||process.cwd(),e[0].replace(/["|']/g,"")),-1===indexOf(b.loaded,e)){var f=b.file;b.file=e,c(fs.readFileSync(e,"utf8"),topLevelTokens,b),b.loaded.push(e),b.file=f}return d}throw new Error("import accepts a single file")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(d)+"'")},global:function(a,b){var c=a.replace(/^global\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*\s*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"="===utils.findNextToken(c)){d=d[1].replace(/^\s+|\s+$/g,"");var e=utils.getTokensBetween(c,"=",";",!0).join(""),f=e.substring(1,e.length-1);if(f=f.replace(/^\s+|\s+$/g,""),/^require\(/.test(f)){var g=utils.getParamList(f.replace("require")).replace(/[\(|\)]/g,"").split(",");1===g.length&&(g=g[0].replace(/["|']/g,""),f=["require('",utils.resolve(b.file||process.cwd(),g),"')"].join(""))}return b.scope.push({name:d,body:f}),c=c.replace(e,"")}throw new Error("unexpected token : expected : '=' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"function":function(a,b){var c=a.replace(/^function\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)\s*/);if(d){if(c=c.replace(d[0],""),"("===utils.findNextToken(c)){d=d[1];var e=utils.getParamList(c);if(c=c.replace(e,"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){var f=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(f,""),b.scope.push({name:d,body:"function"+e+f}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},rule:function(a,b,c){var d=a.replace(/^rule\s*/,""),e=d.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')/);if(e){if(d=d.replace(e[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(d)){e=e[1].replace(/^["']|["']$/g,"");var f={name:e,options:{},constraints:null,action:null},g=utils.getTokensBetween(d,"{","}",!0).join("");return d=d.replace(g,""),c(g.replace(/^\{\s*|\}\s*$/g,""),ruleTokens,f),b.rules.push(f),d}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(d)+"'")}throw new Error("missing name")}};module.exports=topLevelTokens},{"../../extended":11,"./util.js":34,__browserify_process:51,fs:48}],34:[function(a,b,c){var d=a("__browserify_process"),e=a("path"),f=/[\s|\n|\r|\t]/,g=e.sep||("win32"===d.platform?"\\":"/"),h={"{":"}","}":"{","(":")",")":"(","[":"]"},i=c.getTokensBetween=function(a,b,c,d){var e=0,f=[];b||(b=h[c],e=1),c||(c=h[b]),a=Object(a);for(var g,i=!1,j=0,k=!1;g=a.charAt(j++);)if(g===b)e++,i?f.push(g):(i=!0,d&&f.push(g));else if(g===c&&j){if(e--,0===e){d&&f.push(g),k=!0;break}f.push(g)}else i&&f.push(g);if(!k)throw new Error("Unable to match "+b+" in "+a);return f};c.getParamList=function(a){return i(a,"(",")",!0).join("")},c.resolve=function(a,b){return""!==e.extname(a)&&(a=e.dirname(a)),1===b.split(g).length?b:e.resolve(a,b)};var j=c.findNextTokenIndex=function(a,b,c){b=b||0,c=c||a.length;var d=-1,e=a.length;for((!c||c>e)&&(c=e);c>b;b++){var g=a.charAt(b);if(!f.test(g)){d=b;break}}return d};c.findNextToken=function(a,b,c){return a.charAt(j(a,b,c))}},{__browserify_process:51,path:49}],35:[function(a,b,c){!function(){"use strict";var b=a("./extended"),d=b.merge,e=b.forEach,f=b.declare,g=a("./constraintMatcher"),h=a("./constraint"),i=f({}),j=i.extend({instance:{constructor:function(a,c,f,i,j){j=j||{},this.type=a,this.alias=c,this.conditions=f,this.pattern=j.pattern,this.constraints=[new h.ObjectConstraint(a)];var k=g.toConstraints(f,d({alias:c},j));if(k.length)this.constraints=this.constraints.concat(k);else{var l=new h.TrueConstraint;this.constraints.push(l)}if(i&&!b.isEmpty(i)){var m=new h.HashConstraint(i);this.constraints.push(m)}e(this.constraints,function(a){a.set("alias",c)})},hasConstraint:function(a){return b.some(this.constraints,function(b){return b instanceof a})},hashCode:function(){return[this.type,this.alias,b.format("%j",this.conditions)].join(":")},toString:function(){return b.format("%j",this.constraints)}}}).as(c,"ObjectPattern");j.extend().as(c,"NotPattern"),i.extend({instance:{constructor:function(a,b){this.leftPattern=a,this.rightPattern=b},hashCode:function(){return[this.leftPattern.hashCode(),this.rightPattern.hashCode()].join(":")},getters:{constraints:function(){return this.leftPattern.constraints.concat(this.rightPattern.constraints)}}}}).as(c,"CompositePattern");var k=f({}).as(c,"InitialFact");j.extend({instance:{constructor:function(){this._super([k,"i",[],{}])},assert:function(){return!0}}}).as(c,"InitialFactPattern")}()},{"./constraint":7,"./constraintMatcher":8,"./extended":11}],36:[function(a,b,c){"use strict";function d(a,b,c,d){e.isArray(b)?(d=c,c=b):b=b||{};var g=e.every(c,function(a){return f(a)});g&&1===c.length&&(c=c[0],g=!1);var h=[],i=b.scope||{};if(c.scope=i,g){for(var j,k=function(a,b){n[b]?e(n).forEach(function(b){b.push(a)}):(n[b]=0===b?[]:n[b-1].slice(),0!==b&&n[b].pop(),n[b].push(a))},l=c.length,n=[],o=0;l>o;o++)j=c[o],j.scope=i,e.forEach(p(j),k);h=e.map(n,function(c){for(var e=null,f=0;f>>0;if(0===d)return-1;var e=d;arguments.length>2&&(e=Number(arguments[2]),e!==e?e=0:0!==e&&e!==1/0&&e!==-(1/0)&&(e=(e>0||-1)*P(Q(e))));for(var f=e>=0?R(e,d-1):d-Q(e);f>=0;f--)if(f in c&&c[f]===b)return f;return-1}function i(a,b,c){if(a&&X&&X===a.filter)return a.filter(b,c);if(!N(a)||"function"!=typeof b)throw new TypeError;for(var 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0;if(0>b||b>=a.length)throw new Error("targetStart out of bounds");if(0>c||c>=e.length)throw new Error("sourceStart out of bounds");if(0>d||d>e.length)throw new Error("sourceEnd out of bounds");return d>this.length&&(d=this.length),a.length-bthis.length)throw new Error("oob");if(a>b)throw new Error("oob");return new l(this.parent,b-a,+a+this.offset)},l.prototype.utf8Slice=function(a,b){return this.toString("utf8",a,b)},l.prototype.binarySlice=function(a,b){return this.toString("binary",a,b)},l.prototype.asciiSlice=function(a,b){return this.toString("ascii",a,b)},l.prototype.utf8Write=function(a,b){return this.write(a,b,"utf8")},l.prototype.binaryWrite=function(a,b){return this.write(a,b,"binary")},l.prototype.asciiWrite=function(a,b){return this.write(a,b,"ascii")},l.prototype.readUInt8=function(a,b){var c=this;return b||(D.ok(void 0!==a&&null!==a,"missing 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b=this.removeFromLeftMemory(a);b&&(b=b.data,b.blocked||this.__propagate("retract",b.clone()))},__modify:function(a,b){var c=b.blocked,d=a.factHash,e=this.plucker(d);if(l(e)){for(var f=0,g=e.length;g>f;f++)if(this.__isMatch(a,e[f],!0)){a.blocked=!0;break}}else a.blocked=this.__isMatch(a,e,!0);var h=a.blocked;h?c||this.__propagate("retract",b.clone()):c?this.__propagate("assert",a.clone()):this.__propagate("modify",a.clone())},modifyLeft:function(a){var b=this.removeFromLeftMemory(a);if(!b)throw new Error;this.__addToLeftMemory(a),this.__modify(a,b.data);var c=this.fromMemory[a.fact.id];if(this.fromMemory[a.fact.id]={},c)for(var d in c)if(d!==a.hashCode){var e=c[d];b=this.removeFromLeftMemory(e),b&&(e=e.clone(),e.blocked=!1,this.__addToLeftMemory(e),this.__modify(e,b.data))}},__findMatches:function(a){var b=a.factHash,c=this.plucker(b),d=!1;if(l(c)){for(var e=0,f=c.length;f>e;e++)if(this.__isMatch(a,c[e],!0))return a.blocked=!0,void 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d=a("../extended"),e=d.forEach,f=d.some,g=d.declare,h=a("../pattern.js"),i=h.ObjectPattern,j=h.FromPattern,k=h.FromNotPattern,l=h.NotPattern,m=h.CompositePattern,n=h.InitialFactPattern,o=a("../constraint"),p=o.HashConstraint,q=o.ReferenceConstraint,r=a("./aliasNode"),s=a("./equalityNode"),t=a("./joinNode"),u=a("./notNode"),v=a("./fromNode"),w=a("./fromNotNode"),x=a("./leftAdapterNode"),y=a("./rightAdapterNode"),z=a("./typeNode"),A=a("./terminalNode"),B=a("./propertyNode");g({instance:{constructor:function(a,b){this.terminalNodes=[],this.joinNodes=[],this.nodes=[],this.constraints=[],this.typeNodes=[],this.__ruleCount=0,this.bucket={counter:0,recency:0},this.agendaTree=b,this.workingMemory=a},assertRule:function(a){var b=new 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this.__checkEqual(new s(b)).addRule(a)},__createPropertyNode:function(a,b){return this.__checkEqual(new B(b)).addRule(a)},__createAliasNode:function(a,b){return this.__checkEqual(new r(b)).addRule(a)},__createAdapterNode:function(a,b){return("left"===b?new x:new y).addRule(a)},__createJoinNode:function(a,b,c,d){var e;b.rightPattern instanceof l?e=new u:b.rightPattern instanceof k?e=new w(b.rightPattern,this.workingMemory):b.rightPattern instanceof j?e=new v(b.rightPattern,this.workingMemory):(e=new t,this.joinNodes.push(e)),e.__rule__=a;var f=e;if(c instanceof t){var g=this.__createAdapterNode(a,d);f.addOutNode(g,b),f=g}return f.addOutNode(c,b),e.addRule(a)},__addToNetwork:function(a,b,c,d){b instanceof i?!(b instanceof l||b instanceof j||b instanceof k)||d&&"left"!==d?this.__createAlphaNode(a,b,c,d):b instanceof k?this.__createBetaNode(a,new m(new n,b),c,d):this.__createBetaNode(a,new m(new n,b),c,d):b instanceof 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e,f,g,h=this.rightTuples,i=this.constraint,j={next:d.head},k=h.length;j=j.next;){if(e=j.data,this.removeFromLeftBlockedMemory(e),0!==k){for(i.setLeftContext(e),f=b;f=f.next;)if(i.setRightContext(g=f.data).isMatch()){e.blocker=g,this.addToLeftBlockedMemory(g.blocking.push(e)),e=null;break}i.clearContexts()}e&&(this.__addToLeftMemory(e),this.__propagate("assert",e.clone()))}d.clear()}},retractLeft:function(a){var b=this.removeFromLeftMemory(a);if(b)this.__propagate("retract",b.data.clone());else if(!this.removeFromLeftBlockedMemory(a))throw new Error},assertLeft:function(a){var b,c,d=this.rightTuples,e=this.constraint;if(d.length){for(b={next:d.head},e.setLeftContext(a);(b=b.next)&&a;)e.setRightContext(c=b.data).isMatch()&&(a.blocker=c,this.addToLeftBlockedMemory(c.blocking.push(a)),a=null);e.clearContexts()}a&&(this.__addToLeftMemory(a),this.__propagate("assert",a.clone()))},assertRight:function(a){this.__addToRightMemory(a),a.blocking=new d;var b,c,e=this.leftTuples,f=this.constraint;if(e.length){for(c={next:e.head},f.setRightContext(a);c=c.next;)b=c.data,f.setLeftContext(b).isMatch()&&(this.__propagate("retract",b.clone()),this.removeFromLeftMemory(b),b.blocker=a,this.addToLeftBlockedMemory(a.blocking.push(b)));f.clearContexts()}},addToLeftBlockedMemory:function(a){var b=a.data,c=b.hashCode,d=this.leftMemory[c];return this.leftTupleMemory[c]=a,d&&this.leftTuples.remove(d),this},removeFromLeftBlockedMemory:function(a){var b=this.leftTupleMemory[a.hashCode]||null;return b&&(delete this.leftTupleMemory[a.hashCode],b.data.blocker.blocking.remove(b)),b},modifyLeft:function(a){var b,c,d,e,f=this.removeFromLeftMemory(a),g=this.constraint,h=this.rightTuples,i=h.length,j=!1;if(f||(f=this.removeFromLeftBlockedMemory(a),j=!0),!f)throw new Error;if(b=f.data,b&&b.blocker&&(e=this.rightMemory[b.blocker.hashCode]),e&&(g.setLeftContext(a),g.setRightContext(d=e.data).isMatch()&&(j||this.__propagate("retract",b.clone()),a.blocker=d,this.addToLeftBlockedMemory(d.blocking.push(a)),a=null)),a&&i){for(c={next:h.head},g.setLeftContext(a);c=c.next;)if(g.setRightContext(d=c.data).isMatch()){j||this.__propagate("retract",b.clone()),this.addToLeftBlockedMemory(d.blocking.push(a)),a.blocker=d,a=null;break}g.clearContexts()}a&&(this.__addToLeftMemory(a),j?this.__propagate("assert",a.clone()):this.__propagate("modify",a.clone()))},modifyRight:function(a){var b=this.removeFromRightMemory(a);if(!b)throw new Error;var c,e,f=b.data,g=this.leftTuples,h=g.length,i=this.constraint,j=f.blocking;if(this.__addToRightMemory(a),a.blocking=new 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2,16],17:[1,48],19:[2,16],20:[2,16],21:[2,16],22:[2,16],24:[2,16],25:[2,16],26:[2,16],27:[2,16],34:[2,16],36:[2,16],47:[2,16]},{5:[2,17],17:[1,48],19:[2,17],20:[2,17],21:[2,17],22:[2,17],24:[2,17],25:[2,17],26:[2,17],27:[2,17],34:[2,17],36:[2,17],47:[2,17]},{5:[2,18],17:[1,48],19:[2,18],20:[2,18],21:[2,18],22:[2,18],24:[2,18],25:[2,18],26:[2,18],27:[2,18],34:[2,18],36:[2,18],47:[2,18]},{5:[2,37],8:[2,37],11:[2,37],12:[2,37],13:[2,37],15:[2,37],17:[2,37],19:[2,37],20:[2,37],21:[2,37],22:[2,37],24:[2,37],25:[2,37],26:[2,37],27:[2,37],29:[2,37],31:[2,37],34:[2,37],36:[2,37],38:[2,37],41:[2,37],42:[2,37],44:[2,37],46:[2,37],47:[2,37]},{44:[1,89]},{44:[1,90]},{41:[1,44],42:[1,45],44:[1,91],46:[1,46]},{5:[2,41],8:[2,41],11:[2,41],12:[2,41],13:[2,41],15:[2,41],17:[2,41],19:[2,41],20:[2,41],21:[2,41],22:[2,41],24:[2,41],25:[2,41],26:[2,41],27:[2,41],29:[2,41],31:[2,41],34:[2,41],36:[2,41],38:[2,41],41:[2,41],42:[2,41],44:[2,41],46:[2,41],47:[2,41]},{38:[1,83],47:[1,92]},{5:[2,57],8:[2,57],11:[2,57],12:[2,57],13:[2,57],15:[2,57],17:[2,57],19:[2,57],20:[2,57],21:[2,57],22:[2,57],24:[2,57],25:[2,57],26:[2,57],27:[2,57],29:[2,57],31:[2,57],34:[2,57],36:[2,57],38:[2,57],44:[2,57],47:[2,57]},{5:[2,13],8:[1,53],15:[1,52],17:[2,13],19:[2,13],20:[2,13],21:[2,13],22:[2,13],24:[2,13],25:[2,13],26:[2,13],27:[2,13],34:[2,13],36:[2,13],47:[2,13]},{5:[2,49],8:[2,49],11:[2,49],12:[2,49],13:[2,49],15:[2,49],17:[2,49],19:[2,49],20:[2,49],21:[2,49],22:[2,49],24:[2,49],25:[2,49],26:[2,49],27:[2,49],29:[2,49],31:[2,49],34:[2,49],36:[2,49],38:[2,49],44:[2,49],47:[2,49]},{7:93,30:15,32:14,39:23,40:[1,26],42:[1,24],43:9,45:10,46:[1,16],48:[1,18],49:[1,19],50:11,51:[1,20],52:12,53:[1,21],54:13,55:[1,22]},{5:[2,10],8:[2,10],11:[1,54],12:[1,55],13:[1,56],15:[2,10],17:[2,10],19:[2,10],20:[2,10],21:[2,10],22:[2,10],24:[2,10],25:[2,10],26:[2,10],27:[2,10],34:[2,10],36:[2,10],47:[2,10]},{5:[2,11],8:[2,11],11:[1,54],12:[1,55],13:[1,56],15:[2,11],17:[2,11],19:[2,11],20:[2,11],21:[2,11],22:[2,11],24:[2,11],25:[2,11],26:[2,11],27:[2,11],34:[2,11],36:[2,11],47:[2,11]},{5:[2,6],8:[2,6],11:[2,6],12:[2,6],13:[2,6],15:[2,6],17:[2,6],19:[2,6],20:[2,6],21:[2,6],22:[2,6],24:[2,6],25:[2,6],26:[2,6],27:[2,6],34:[2,6],36:[2,6],47:[2,6]},{5:[2,7],8:[2,7],11:[2,7],12:[2,7],13:[2,7],15:[2,7],17:[2,7],19:[2,7],20:[2,7],21:[2,7],22:[2,7],24:[2,7],25:[2,7],26:[2,7],27:[2,7],34:[2,7],36:[2,7],47:[2,7]},{5:[2,8],8:[2,8],11:[2,8],12:[2,8],13:[2,8],15:[2,8],17:[2,8],19:[2,8],20:[2,8],21:[2,8],22:[2,8],24:[2,8],25:[2,8],26:[2,8],27:[2,8],34:[2,8],36:[2,8],47:[2,8]},{5:[2,38],8:[2,38],11:[2,38],12:[2,38],13:[2,38],15:[2,38],17:[2,38],19:[2,38],20:[2,38],21:[2,38],22:[2,38],24:[2,38],25:[2,38],26:[2,38],27:[2,38],29:[2,38],31:[2,38],34:[2,38],36:[2,38],38:[2,38],41:[2,38],42:[2,38],44:[2,38],46:[2,38],47:[2,38]},{5:[2,39],8:[2,39],11:[2,39],12:[2,39],13:[2,39],15:[2,39],17:[2,39],19:[2,39],20:[2,39],21:[2,39],22:[2,39],24:[2,39],25:[2,39],26:[2,39],27:[2,39],29:[2,39],31:[2,39],34:[2,39],36:[2,39],38:[2,39],41:[2,39],42:[2,39],44:[2,39],46:[2,39],47:[2,39]},{5:[2,40],8:[2,40],11:[2,40],12:[2,40],13:[2,40],15:[2,40],17:[2,40],19:[2,40],20:[2,40],21:[2,40],22:[2,40],24:[2,40],25:[2,40],26:[2,40],27:[2,40],29:[2,40],31:[2,40],34:[2,40],36:[2,40],38:[2,40],41:[2,40],42:[2,40],44:[2,40],46:[2,40],47:[2,40]},{5:[2,42],8:[2,42],11:[2,42],12:[2,42],13:[2,42],15:[2,42],17:[2,42],19:[2,42],20:[2,42],21:[2,42],22:[2,42],24:[2,42],25:[2,42],26:[2,42],27:[2,42],29:[2,42],31:[2,42],34:[2,42],36:[2,42],38:[2,42],41:[2,42],42:[2,42],44:[2,42],46:[2,42],47:[2,42]},{38:[2,34],44:[2,34],47:[2,34]}],defaultActions:{31:[2,1]},parseError:function(a,b){if(!b.recoverable)throw new Error(a);
+this.trace(a)},parse:function(a){function b(){var a;return a=c.lexer.lex()||m,"number"!=typeof a&&(a=c.symbols_[a]||a),a}var c=this,d=[0],e=[null],f=[],g=this.table,h="",i=0,j=0,k=0,l=2,m=1;this.lexer.setInput(a),this.lexer.yy=this.yy,this.yy.lexer=this.lexer,this.yy.parser=this,"undefined"==typeof this.lexer.yylloc&&(this.lexer.yylloc={});var n=this.lexer.yylloc;f.push(n);var o=this.lexer.options&&this.lexer.options.ranges;this.parseError="function"==typeof this.yy.parseError?this.yy.parseError:Object.getPrototypeOf(this).parseError;for(var p,q,r,s,t,u,v,w,x,y={};;){if(r=d[d.length-1],this.defaultActions[r]?s=this.defaultActions[r]:((null===p||"undefined"==typeof p)&&(p=b()),s=g[r]&&g[r][p]),"undefined"==typeof s||!s.length||!s[0]){var z="";x=[];for(u in g[r])this.terminals_[u]&&u>l&&x.push("'"+this.terminals_[u]+"'");z=this.lexer.showPosition?"Parse error on line "+(i+1)+":\n"+this.lexer.showPosition()+"\nExpecting "+x.join(", ")+", got '"+(this.terminals_[p]||p)+"'":"Parse error on line "+(i+1)+": Unexpected "+(p==m?"end of input":"'"+(this.terminals_[p]||p)+"'"),this.parseError(z,{text:this.lexer.match,token:this.terminals_[p]||p,line:this.lexer.yylineno,loc:n,expected:x})}if(s[0]instanceof Array&&s.length>1)throw new Error("Parse Error: multiple actions possible at state: "+r+", token: "+p);switch(s[0]){case 1:d.push(p),e.push(this.lexer.yytext),f.push(this.lexer.yylloc),d.push(s[1]),p=null,q?(p=q,q=null):(j=this.lexer.yyleng,h=this.lexer.yytext,i=this.lexer.yylineno,n=this.lexer.yylloc,k>0&&k--);break;case 2:if(v=this.productions_[s[1]][1],y.$=e[e.length-v],y._$={first_line:f[f.length-(v||1)].first_line,last_line:f[f.length-1].last_line,first_column:f[f.length-(v||1)].first_column,last_column:f[f.length-1].last_column},o&&(y._$.range=[f[f.length-(v||1)].range[0],f[f.length-1].range[1]]),t=this.performAction.call(y,h,j,i,this.yy,s[1],e,f),"undefined"!=typeof t)return t;v&&(d=d.slice(0,2*-1*v),e=e.slice(0,-1*v),f=f.slice(0,-1*v)),d.push(this.productions_[s[1]][0]),e.push(y.$),f.push(y._$),w=g[d[d.length-2]][d[d.length-1]],d.push(w);break;case 3:return!0}}return!0}},c=function(){var a={EOF:1,parseError:function(a,b){if(!this.yy.parser)throw new Error(a);this.yy.parser.parseError(a,b)},setInput:function(a){return this._input=a,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},input:function(){var a=this._input[0];this.yytext+=a,this.yyleng++,this.offset++,this.match+=a,this.matched+=a;var b=a.match(/(?:\r\n?|\n).*/g);return b?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),a},unput:function(a){var b=a.length,c=a.split(/(?:\r\n?|\n)/g);this._input=a+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-b-1),this.offset-=b;var d=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),c.length-1&&(this.yylineno-=c.length-1);var e=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:c?(c.length===d.length?this.yylloc.first_column:0)+d[d.length-c.length].length-c[0].length:this.yylloc.first_column-b},this.options.ranges&&(this.yylloc.range=[e[0],e[0]+this.yyleng-b]),this.yyleng=this.yytext.length,this},more:function(){return this._more=!0,this},reject:function(){return this.options.backtrack_lexer?(this._backtrack=!0,this):this.parseError("Lexical error on line "+(this.yylineno+1)+". You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true).\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},less:function(a){this.unput(this.match.slice(a))},pastInput:function(){var a=this.matched.substr(0,this.matched.length-this.match.length);return(a.length>20?"...":"")+a.substr(-20).replace(/\n/g,"")},upcomingInput:function(){var a=this.match;return a.length<20&&(a+=this._input.substr(0,20-a.length)),(a.substr(0,20)+(a.length>20?"...":"")).replace(/\n/g,"")},showPosition:function(){var a=this.pastInput(),b=new Array(a.length+1).join("-");return a+this.upcomingInput()+"\n"+b+"^"},test_match:function(a,b){var c,d,e;if(this.options.backtrack_lexer&&(e={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(e.yylloc.range=this.yylloc.range.slice(0))),d=a[0].match(/(?:\r\n?|\n).*/g),d&&(this.yylineno+=d.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:d?d[d.length-1].length-d[d.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+a[0].length},this.yytext+=a[0],this.match+=a[0],this.matches=a,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(a[0].length),this.matched+=a[0],c=this.performAction.call(this,this.yy,this,b,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),c)return c;if(this._backtrack){for(var f in e)this[f]=e[f];return!1}return!1},next:function(){if(this.done)return this.EOF;this._input||(this.done=!0);var a,b,c,d;this._more||(this.yytext="",this.match="");for(var e=this._currentRules(),f=0;fb[0].length)){if(b=c,d=f,this.options.backtrack_lexer){if(a=this.test_match(c,e[f]),a!==!1)return a;if(this._backtrack){b=!1;continue}return!1}if(!this.options.flex)break}return b?(a=this.test_match(b,e[d]),a!==!1?a:!1):""===this._input?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+". Unrecognized text.\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},lex:function(){var a=this.next();return a?a:this.lex()},begin:function(a){this.conditionStack.push(a)},popState:function(){var a=this.conditionStack.length-1;return a>0?this.conditionStack.pop():this.conditionStack[0]},_currentRules:function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},topState:function(a){return a=this.conditionStack.length-1-Math.abs(a||0),a>=0?this.conditionStack[a]:"INITIAL"},pushState:function(a){this.begin(a)},stateStackSize:function(){return this.conditionStack.length},options:{},performAction:function(a,b,c,d){switch(c){case 0:return 29;case 1:return 31;case 2:return"from";case 3:return 24;case 4:return 25;case 5:return 21;case 6:return 19;case 7:return 22;case 8:return 20;case 9:return 26;case 10:return 27;case 11:return 34;case 12:return 36;case 13:return 55;case 14:return 53;case 15:break;case 16:return 49;case 17:return 48;case 18:return 48;case 19:return 40;case 20:return 51;case 21:return 41;case 22:return 11;case 23:return 12;case 24:return 13;case 25:return 38;case 26:return 8;case 27:return 26;case 28:return 27;case 29:return 24;case 30:return 24;case 31:return 25;case 32:return 25;case 33:return 21;case 34:return 22;case 35:return 20;case 36:return 19;case 37:return 34;case 38:return 36;case 39:return 15;case 40:return 17;case 41:return 46;case 42:return 44;case 43:return 42;case 44:return 47;case 45:return 9;case 46:return 5}},rules:[/^(?:\s+in\b)/,/^(?:\s+notIn\b)/,/^(?:\s+from\b)/,/^(?:\s+(eq|EQ)\b)/,/^(?:\s+(neq|NEQ)\b)/,/^(?:\s+(lte|LTE)\b)/,/^(?:\s+(lt|LT)\b)/,/^(?:\s+(gte|GTE)\b)/,/^(?:\s+(gt|GT)\b)/,/^(?:\s+(like|LIKE)\b)/,/^(?:\s+(notLike|NOT_LIKE)\b)/,/^(?:\s+(and|AND)\b)/,/^(?:\s+(or|OR)\b)/,/^(?:\s+null\b)/,/^(?:\s+(true|false)\b)/,/^(?:\s+)/,/^(?:-?[0-9]+(?:\.[0-9]+)?\b)/,/^(?:'[^']*')/,/^(?:"[^"]*")/,/^(?:([a-zA-Z_$][0-9a-zA-Z_$]*))/,/^(?:^\/((?![\s=])[^[\/\n\\]*(?:(?:\\[\s\S]|\[[^\]\n\\]*(?:\\[\s\S][^\]\n\\]*)*])[^[\/\n\\]*)*\/[imgy]{0,4})(?!\w))/,/^(?:\.)/,/^(?:\*)/,/^(?:\/)/,/^(?:\%)/,/^(?:,)/,/^(?:-)/,/^(?:=~)/,/^(?:!=~)/,/^(?:==)/,/^(?:===)/,/^(?:!=)/,/^(?:!==)/,/^(?:<=)/,/^(?:>=)/,/^(?:>)/,/^(?:<)/,/^(?:&&)/,/^(?:\|\|)/,/^(?:\+)/,/^(?:\^)/,/^(?:\()/,/^(?:\])/,/^(?:\[)/,/^(?:\))/,/^(?:!)/,/^(?:$)/],conditions:{INITIAL:{rules:[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46],inclusive:!0}}};return a}();return b.lexer=c,a.prototype=b,b.Parser=a,new a}();"undefined"!=typeof a&&"undefined"!=typeof c&&(c.parser=e,c.Parser=e.Parser,c.parse=function(){return e.parse.apply(e,arguments)},c.main=function(b){b[1]||(console.log("Usage: "+b[0]+" FILE"),d.exit(1));var e=a("fs").readFileSync(a("path").normalize(b[1]),"utf8");return c.parser.parse(e)},"undefined"!=typeof b&&a.main===b&&c.main(d.argv.slice(1)))},{__browserify_process:54,fs:51,path:52}],34:[function(a,b,c){!function(){"use strict";var b=a("./constraint/parser"),d=a("./nools/nool.parser");c.parseConstraint=function(a){try{return b.parse(a)}catch(c){throw new Error("Invalid expression '"+a+"'")}},c.parseRuleSet=function(a,b){return d.parse(a,b)}}()},{"./constraint/parser":33,"./nools/nool.parser":35}],35:[function(a,b,c){"use strict";var d=a("./tokens.js"),e=a("../../extended"),f=e.hash.keys,g=a("./util.js"),h=function(a,b,c){var d=a;a=a.replace(/\/\/(.*)/g,"").replace(/\n|\r|\r\n/g," ");for(var e,i=new RegExp("^("+f(b).join("|")+")");a&&-1!==(e=g.findNextTokenIndex(a));){a=a.substr(e);var j=a.match(i);if(null===j)throw new Error("Error parsing "+a);if(j=j[1],!(j in b))throw new Error("Unknown token"+j);try{a=b[j](a,c,h).replace(/^\s*|\s*$/g,"")}catch(k){throw new Error("Invalid "+j+" definition \n"+k.message+"; \nstarting at : "+d)}}};c.parse=function(a,b){var c={define:[],rules:[],scope:[],loaded:[],file:b};return h(a,d,c),c}},{"../../extended":12,"./tokens.js":36,"./util.js":37}],36:[function(require,module,exports){var process=require("__browserify_process"),utils=require("./util.js"),fs=require("fs"),indexOf=require("../../extended").indexOf,isWhiteSpace=function(a){return 0===a.replace(/[\s|\n|\r|\t]/g,"").length},ruleTokens={salience:function(){var a=/^(salience|priority)\s*:\s*(-?\d+)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=parseInt(d[2],10);if(isNaN(e))throw new Error("Invalid salience/priority "+d[2]);return c.options.priority=e,b.replace(d[0],"")}throw new Error("invalid format")}}(),agendaGroup:function(){var a=/^(agenda-group|agendaGroup)\s*:\s*([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid agenda-group "+d[2]);return c.options.agendaGroup=e.replace(/^["']|["']$/g,""),b.replace(d[0],"")}throw new Error("invalid format")}}(),autoFocus:function(){var a=/^(auto-focus|autoFocus)\s*:\s*(true|false)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid auto-focus "+d[2]);return c.options.autoFocus="true"===e?!0:!1,b.replace(d[0],"")}throw new Error("invalid format")}}(),"agenda-group":function(){return this.agendaGroup.apply(this,arguments)},"auto-focus":function(){return this.autoFocus.apply(this,arguments)},priority:function(){return this.salience.apply(this,arguments)},when:function(){var ruleRegExp=/^(\$?\w+) *: *(\w+)(.*)/,joinFunc=function(a,b){return"; "+b},constraintRegExp=/(\{ *(?:["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']? *(?:, *["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']?)*)+ *\})/,predicateExp=/^(\w+) *\((.*)\)$/m,fromRegExp=/(\bfrom\s+.*)/,parseRules=function(str){for(var rules=[],ruleLines=str.split(";"),l=ruleLines.length,ruleLine,i=0;l>i&&(ruleLine=ruleLines[i].replace(/^\s*|\s*$/g,"").replace(/\n/g,""));i++)if(!isWhiteSpace(ruleLine)){var rule=[];if(predicateExp.test(ruleLine)){var m=ruleLine.match(predicateExp),pred=m[1].replace(/^\s*|\s*$/g,"");if(rule.push(pred),ruleLine=m[2].replace(/^\s*|\s*$/g,""),"or"===pred){rule=rule.concat(parseRules(ruleLine.replace(/,\s*(\$?\w+\s*:)/g,joinFunc))),rules.push(rule);continue}}var parts=ruleLine.match(ruleRegExp);if(!parts||!parts.length)throw new Error("Invalid constraint "+ruleLine);rule.push(parts[2],parts[1]);var constraints=parts[3].replace(/^\s*|\s*$/g,""),hashParts=constraints.match(constraintRegExp),from=null,fromMatch;if(hashParts){var hash=hashParts[1],constraint=constraints.replace(hash,"");fromRegExp.test(constraint)&&(fromMatch=constraint.match(fromRegExp),from=fromMatch[0],constraint=constraint.replace(fromMatch[0],"")),constraint&&rule.push(constraint.replace(/^\s*|\s*$/g,"")),hash&&rule.push(eval("("+hash.replace(/(\$?\w+)\s*:\s*(\$?\w+)/g,'"$1" : "$2"')+")"))}else constraints&&!isWhiteSpace(constraints)&&(fromRegExp.test(constraints)&&(fromMatch=constraints.match(fromRegExp),from=fromMatch[0],constraints=constraints.replace(fromMatch[0],"")),rule.push(constraints));from&&rule.push(from),rules.push(rule)}return rules};return function(a,b){var c=a.replace(/^when\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(d,""),b.constraints=parseRules(d.replace(/^\{\s*|\}\s*$/g,"")),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}(),then:function(){return function(a,b){if(b.action)throw new Error("action already defined for rule"+b.name);var c=a.replace(/^then\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");if(c=c.replace(d,""),b.action||(b.action=d.replace(/^\{\s*|\}\s*$/g,"")),!isWhiteSpace(c))throw new Error("Error parsing then block "+a);return c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}()},topLevelTokens={"/":function(a){return a.match(/^\/\*/)?a.replace(/\/\*.*?\*\//,""):a},define:function(a,b){var c=a.replace(/^define\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){d=d[1];var e=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(e,""),b.define.push({name:d,properties:"("+e+")"}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"import":function(a,b,c){if("undefined"!=typeof window)throw new Error("import cannot be used in a browser");var d=a.replace(/^import\s*/,"");if("("===utils.findNextToken(d)){var e=utils.getParamList(d);if(d=d.replace(e,"").replace(/^\s*|\s*$/g,""),";"===utils.findNextToken(d)&&(d=d.replace(/\s*;/,"")),e=e.replace(/[\(|\)]/g,"").split(","),1===e.length){if(e=utils.resolve(b.file||process.cwd(),e[0].replace(/["|']/g,"")),-1===indexOf(b.loaded,e)){var f=b.file;b.file=e,c(fs.readFileSync(e,"utf8"),topLevelTokens,b),b.loaded.push(e),b.file=f}return d}throw new Error("import accepts a single file")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(d)+"'")},global:function(a,b){var c=a.replace(/^global\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*\s*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"="===utils.findNextToken(c)){d=d[1].replace(/^\s+|\s+$/g,"");var e=utils.getTokensBetween(c,"=",";",!0).join(""),f=e.substring(1,e.length-1);if(f=f.replace(/^\s+|\s+$/g,""),/^require\(/.test(f)){var g=utils.getParamList(f.replace("require")).replace(/[\(|\)]/g,"").split(",");1===g.length&&(g=g[0].replace(/["|']/g,""),f=["require('",utils.resolve(b.file||process.cwd(),g),"')"].join(""))}return b.scope.push({name:d,body:f}),c=c.replace(e,"")}throw new Error("unexpected token : expected : '=' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"function":function(a,b){var c=a.replace(/^function\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)\s*/);if(d){if(c=c.replace(d[0],""),"("===utils.findNextToken(c)){d=d[1];var e=utils.getParamList(c);if(c=c.replace(e,"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){var f=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(f,""),b.scope.push({name:d,body:"function"+e+f}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},rule:function(a,b,c){var d=a.replace(/^rule\s*/,""),e=d.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')/);if(e){if(d=d.replace(e[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(d)){e=e[1].replace(/^["']|["']$/g,"");var f={name:e,options:{},constraints:null,action:null},g=utils.getTokensBetween(d,"{","}",!0).join("");return d=d.replace(g,""),c(g.replace(/^\{\s*|\}\s*$/g,""),ruleTokens,f),b.rules.push(f),d}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(d)+"'")}throw new Error("missing name")}};module.exports=topLevelTokens},{"../../extended":12,"./util.js":37,__browserify_process:54,fs:51}],37:[function(a,b,c){var d=a("__browserify_process"),e=a("path"),f=/[\s|\n|\r|\t]/,g=e.sep||("win32"===d.platform?"\\":"/"),h={"{":"}","}":"{","(":")",")":"(","[":"]"},i=c.getTokensBetween=function(a,b,c,d){var e=0,f=[];b||(b=h[c],e=1),c||(c=h[b]),a=Object(a);for(var g,i=!1,j=0,k=!1;g=a.charAt(j++);)if(g===b)e++,i?f.push(g):(i=!0,d&&f.push(g));else if(g===c&&j){if(e--,0===e){d&&f.push(g),k=!0;break}f.push(g)}else i&&f.push(g);if(!k)throw new Error("Unable to match "+b+" in "+a);return f};c.getParamList=function(a){return i(a,"(",")",!0).join("")},c.resolve=function(a,b){return""!==e.extname(a)&&(a=e.dirname(a)),1===b.split(g).length?b:e.resolve(a,b)};var j=c.findNextTokenIndex=function(a,b,c){b=b||0,c=c||a.length;var d=-1,e=a.length;for((!c||c>e)&&(c=e);c>b;b++){var g=a.charAt(b);if(!f.test(g)){d=b;break}}return d};c.findNextToken=function(a,b,c){return a.charAt(j(a,b,c))}},{__browserify_process:54,path:52}],38:[function(a,b,c){"use strict";var d=a("./extended"),e=d.isEmpty,f=d.merge,g=d.forEach,h=d.declare,i=a("./constraintMatcher"),j=a("./constraint"),k=j.EqualityConstraint,l=0,m=h({}),n=m.extend({instance:{constructor:function(a,b,c,d,h){h=h||{},this.id=l++,this.type=a,this.alias=b,this.conditions=c,this.pattern=h.pattern;var k=[new j.ObjectConstraint(a)],m=i.toConstraints(c,f({alias:b},h));if(m.length)k=k.concat(m);else{var n=new j.TrueConstraint;k.push(n)}if(d&&!e(d)){var o=new j.HashConstraint(d);k.push(o)}g(k,function(a){a.set("alias",b)}),this.constraints=k},getSpecificity:function(){for(var a=this.constraints,b=0,c=0,d=a.length;d>c;c++)a[c]instanceof k&&b++;return b},hasConstraint:function(a){return d.some(this.constraints,function(b){return b instanceof a})},hashCode:function(){return[this.type,this.alias,d.format("%j",this.conditions)].join(":")},toString:function(){return d.format("%j",this.constraints)}}}).as(c,"ObjectPattern"),o=n.extend({instance:{constructor:function(a,b,c,d,e,f){this._super([a,b,c,d,f]),this.from=e.from},hasConstraint:function(a){return d.some(this.constraints,function(b){return b instanceof a})},getSpecificity:function(){return 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l._charsWritten=d._charsWritten,h},l.prototype.toString=function(a,b,c){switch(a=String(a||"utf8").toLowerCase(),"undefined"==typeof b||0>b?b=0:b>this.length&&(b=this.length),"undefined"==typeof c||c>this.length?c=this.length:0>c&&(c=0),b+=this.offset,c+=this.offset,a){case"hex":return this.parent.hexSlice(b,c);case"utf8":case"utf-8":return this.parent.utf8Slice(b,c);case"ascii":return this.parent.asciiSlice(b,c);case"binary":return this.parent.binarySlice(b,c);case"base64":return this.parent.base64Slice(b,c);case"ucs2":case"ucs-2":return this.parent.ucs2Slice(b,c);default:throw new Error("Unknown encoding")}},l.byteLength=d.byteLength,l.prototype.fill=function(a,b,c){if(a||(a=0),b||(b=0),c||(c=this.length),"string"==typeof a&&(a=a.charCodeAt(0)),"number"!=typeof a||isNaN(a))throw new Error("value is not a number");if(b>c)throw new Error("end < start");if(c===b)return 0;if(0==this.length)return 0;if(0>b||b>=this.length)throw new Error("start out of bounds");if(0>c||c>this.length)throw new Error("end out of bounds");return this.parent.fill(a,b+this.offset,c+this.offset)},l.prototype.copy=function(a,b,c,d){var e=this;if(c||(c=0),d||(d=this.length),b||(b=0),c>d)throw new Error("sourceEnd < sourceStart");if(d===c)return 0;if(0==a.length||0==e.length)return 0;if(0>b||b>=a.length)throw new Error("targetStart out of bounds");if(0>c||c>=e.length)throw new Error("sourceStart out of bounds");if(0>d||d>e.length)throw new Error("sourceEnd out of bounds");return d>this.length&&(d=this.length),a.length-bthis.length)throw new Error("oob");if(a>b)throw new Error("oob");return new l(this.parent,b-a,+a+this.offset)},l.prototype.utf8Slice=function(a,b){return this.toString("utf8",a,b)},l.prototype.binarySlice=function(a,b){return this.toString("binary",a,b)},l.prototype.asciiSlice=function(a,b){return this.toString("ascii",a,b)},l.prototype.utf8Write=function(a,b){return this.write(a,b,"utf8")},l.prototype.binaryWrite=function(a,b){return this.write(a,b,"binary")},l.prototype.asciiWrite=function(a,b){return this.write(a,b,"ascii")},l.prototype.readUInt8=function(a,b){var c=this;return b||(D.ok(void 0!==a&&null!==a,"missing 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t=b.isHash,u=Array.prototype.slice,v=/%((?:-?\+?.?\d*)?|(?:\[[^\[|\]]*\]))?([sjdDZ])/g,w=/\{(?:\[([^\[|\]]*)\])?(\w+)\}/g,x=/(-?)(\+?)([A-Z|a-z|\W]?)([1-9][0-9]*)?$/,y=/([1-9][0-9]*)$/g,z={bold:1,bright:1,italic:3,underline:4,blink:5,inverse:7,crossedOut:9,red:31,green:32,yellow:33,blue:34,magenta:35,cyan:36,white:37,redBackground:41,greenBackground:42,yellowBackground:43,blueBackground:44,magentaBackground:45,cyanBackground:46,whiteBackground:47,encircled:52,overlined:53,grey:90,black:90},A={SMILEY:"☺",SOLID_SMILEY:"☻",HEART:"♥",DIAMOND:"♦",CLOVE:"♣",SPADE:"♠",DOT:"•",SQUARE_CIRCLE:"◘",CIRCLE:"○",FILLED_SQUARE_CIRCLE:"◙",MALE:"♂",FEMALE:"♀",EIGHT_NOTE:"♪",DOUBLE_EIGHTH_NOTE:"♫",SUN:"☼",PLAY:"►",REWIND:"◄",UP_DOWN:"↕",PILCROW:"¶",SECTION:"§",THICK_MINUS:"▬",SMALL_UP_DOWN:"↨",UP_ARROW:"↑",DOWN_ARROW:"↓",RIGHT_ARROW:"→",LEFT_ARROW:"←",RIGHT_ANGLE:"∟",LEFT_RIGHT_ARROW:"↔",TRIANGLE:"▲",DOWN_TRIANGLE:"▼",HOUSE:"⌂",C_CEDILLA:"Ç",U_UMLAUT:"ü",E_ACCENT:"é",A_LOWER_CIRCUMFLEX:"â",A_LOWER_UMLAUT:"ä",A_LOWER_GRAVE_ACCENT:"à",A_LOWER_CIRCLE_OVER:"å",C_LOWER_CIRCUMFLEX:"ç",E_LOWER_CIRCUMFLEX:"ê",E_LOWER_UMLAUT:"ë",E_LOWER_GRAVE_ACCENT:"è",I_LOWER_UMLAUT:"ï",I_LOWER_CIRCUMFLEX:"î",I_LOWER_GRAVE_ACCENT:"ì",A_UPPER_UMLAUT:"Ä",A_UPPER_CIRCLE:"Å",E_UPPER_ACCENT:"É",A_E_LOWER:"æ",A_E_UPPER:"Æ",O_LOWER_CIRCUMFLEX:"ô",O_LOWER_UMLAUT:"ö",O_LOWER_GRAVE_ACCENT:"ò",U_LOWER_CIRCUMFLEX:"û",U_LOWER_GRAVE_ACCENT:"ù",Y_LOWER_UMLAUT:"ÿ",O_UPPER_UMLAUT:"Ö",U_UPPER_UMLAUT:"Ü",CENTS:"¢",POUND:"£",YEN:"¥",CURRENCY:"¤",PTS:"₧",FUNCTION:"ƒ",A_LOWER_ACCENT:"á",I_LOWER_ACCENT:"í",O_LOWER_ACCENT:"ó",U_LOWER_ACCENT:"ú",N_LOWER_TILDE:"ñ",N_UPPER_TILDE:"Ñ",A_SUPER:"ª",O_SUPER:"º",UPSIDEDOWN_QUESTION:"¿",SIDEWAYS_L:"⌐",NEGATION:"¬",ONE_HALF:"½",ONE_FOURTH:"¼",UPSIDEDOWN_EXCLAMATION:"¡",DOUBLE_LEFT:"«",DOUBLE_RIGHT:"»",LIGHT_SHADED_BOX:"░",MEDIUM_SHADED_BOX:"▒",DARK_SHADED_BOX:"▓",VERTICAL_LINE:"│",MAZE__SINGLE_RIGHT_T:"┤",MAZE_SINGLE_RIGHT_TOP:"┐",MAZE_SINGLE_RIGHT_BOTTOM_SMALL:"┘",MAZE_SINGLE_LEFT_TOP_SMALL:"┌",MAZE_SINGLE_LEFT_BOTTOM_SMALL:"└",MAZE_SINGLE_LEFT_T:"├",MAZE_SINGLE_BOTTOM_T:"┴",MAZE_SINGLE_TOP_T:"┬",MAZE_SINGLE_CENTER:"┼",MAZE_SINGLE_HORIZONTAL_LINE:"─",MAZE_SINGLE_RIGHT_DOUBLECENTER_T:"╡",MAZE_SINGLE_RIGHT_DOUBLE_BL:"╛",MAZE_SINGLE_RIGHT_DOUBLE_T:"╢",MAZE_SINGLE_RIGHT_DOUBLEBOTTOM_TOP:"╖",MAZE_SINGLE_RIGHT_DOUBLELEFT_TOP:"╕",MAZE_SINGLE_LEFT_DOUBLE_T:"╞",MAZE_SINGLE_BOTTOM_DOUBLE_T:"╧",MAZE_SINGLE_TOP_DOUBLE_T:"╤",MAZE_SINGLE_TOP_DOUBLECENTER_T:"╥",MAZE_SINGLE_BOTTOM_DOUBLECENTER_T:"╨",MAZE_SINGLE_LEFT_DOUBLERIGHT_BOTTOM:"╘",MAZE_SINGLE_LEFT_DOUBLERIGHT_TOP:"╒",MAZE_SINGLE_LEFT_DOUBLEBOTTOM_TOP:"╓",MAZE_SINGLE_LEFT_DOUBLETOP_BOTTOM:"╙",MAZE_SINGLE_LEFT_TOP:"Γ",MAZE_SINGLE_RIGHT_BOTTOM:"╜",MAZE_SINGLE_LEFT_CENTER:"╟",MAZE_SINGLE_DOUBLECENTER_CENTER:"╫",MAZE_SINGLE_DOUBLECROSS_CENTER:"╪",MAZE_DOUBLE_LEFT_CENTER:"╣",MAZE_DOUBLE_VERTICAL:"║",MAZE_DOUBLE_RIGHT_TOP:"╗",MAZE_DOUBLE_RIGHT_BOTTOM:"╝",MAZE_DOUBLE_LEFT_BOTTOM:"╚",MAZE_DOUBLE_LEFT_TOP:"╔",MAZE_DOUBLE_BOTTOM_T:"╩",MAZE_DOUBLE_TOP_T:"╦",MAZE_DOUBLE_LEFT_T:"╠",MAZE_DOUBLE_HORIZONTAL:"═",MAZE_DOUBLE_CROSS:"╬",SOLID_RECTANGLE:"█",THICK_LEFT_VERTICAL:"▌",THICK_RIGHT_VERTICAL:"▐",SOLID_SMALL_RECTANGLE_BOTTOM:"▄",SOLID_SMALL_RECTANGLE_TOP:"▀",PHI_UPPER:"Φ",INFINITY:"∞",INTERSECTION:"∩",DEFINITION:"≡",PLUS_MINUS:"±",GT_EQ:"≥",LT_EQ:"≤",THEREFORE:"⌠",SINCE:"∵",DOESNOT_EXIST:"∄",EXISTS:"∃",FOR_ALL:"∀",EXCLUSIVE_OR:"⊕",BECAUSE:"⌡",DIVIDE:"÷",APPROX:"≈",DEGREE:"°",BOLD_DOT:"∙",DOT_SMALL:"·",CHECK:"√",ITALIC_X:"✗",SUPER_N:"ⁿ",SQUARED:"²",CUBED:"³",SOLID_BOX:"■",PERMILE:"‰",REGISTERED_TM:"®",COPYRIGHT:"©",TRADEMARK:"™",BETA:"β",GAMMA:"γ",ZETA:"ζ",ETA:"η",IOTA:"ι",KAPPA:"κ",LAMBDA:"λ",NU:"ν",XI:"ξ",OMICRON:"ο",RHO:"ρ",UPSILON:"υ",CHI_LOWER:"φ",CHI_UPPER:"χ",PSI:"ψ",ALPHA:"α",ESZETT:"ß",PI:"π",SIGMA_UPPER:"Σ",SIGMA_LOWER:"σ",MU:"µ",TAU:"τ",THETA:"Θ",OMEGA:"Ω",DELTA:"δ",PHI_LOWER:"φ",EPSILON:"ε"},B={toArray:k,pad:h,truncate:i,multiply:l,format:j,style:m,escape:n,trim:o,trimLeft:p,trimRight:q,isEmpty:r};return a.define(b.isString,B).define(b.isArray,{style:m}).expose(B).expose({characters:A})}"undefined"!=typeof c?"undefined"!=typeof b&&b.exports&&(b.exports=d(a("extended"),a("is-extended"),a("date-extended"),a("array-extended"))):"function"==typeof define&&define.amd?define(["extended","is-extended","date-extended","array-extended"],function(a,b,c,e){return d(a,b,c,e)}):this.stringExtended=d(this.extended,this.isExtended,this.dateExtended,this.arrayExtended)}.call(this)},{"array-extended":42,"date-extended":43,extended:46,"is-extended":56}]},{},[1]);
\ No newline at end of file
diff --git a/examples/browser/assets/array-extended.js b/examples/browser/assets/array-extended.js
new file mode 100644
index 0000000..ba1aad0
--- /dev/null
+++ b/examples/browser/assets/array-extended.js
@@ -0,0 +1,3 @@
+/*! array-extended - v0.0.9 - 2013-06-17
+ * Copyright (c) 2013 Doug Martin; Licensed MIT */
+!function(){"use strict";function a(a,b,c){function d(a,b){return o(b,function(b,c){return N(c)||(c=[c]),c.unshift(a),b.unshift(c),b},[])}function e(a,b,c){for(var d=[],e=0;e>>0;if(0===d)return-1;var e=d;arguments.length>2&&(e=Number(arguments[2]),e!==e?e=0:0!==e&&e!==1/0&&e!==-(1/0)&&(e=(e>0||-1)*P(Q(e))));for(var f=e>=0?R(e,d-1):d-Q(e);f>=0;f--)if(f in c&&c[f]===b)return f;return-1}function i(a,b,c){if(a&&X&&X===a.filter)return a.filter(b,c);if(!N(a)||"function"!=typeof b)throw new TypeError;for(var d=Object(a),e=d.length>>>0,f=[],g=0;e>g;g++)if(g in d){var h=d[g];b.call(c,h,g,d)&&f.push(h)}return f}function j(a,b,c){if(!N(a)||"function"!=typeof b)throw new TypeError;if(a&&T&&T===a.forEach)return a.forEach(b,c),a;for(var d=0,e=a.length;e>d;++d)b.call(c||a,a[d],d,a);return a}function k(a,b,c){if(a&&Y&&Y===a.every)return a.every(b,c);if(!N(a)||"function"!=typeof b)throw new TypeError;for(var d=Object(a),e=d.length>>>0,f=0;e>f;f++)if(f in d&&!b.call(c,d[f],f,d))return!1;return!0}function l(a,b,c){if(a&&Z&&Z===a.some)return a.some(b,c);if(!N(a)||"function"!=typeof b)throw new TypeError;for(var d=Object(a),e=d.length>>>0,f=0;e>f;f++)if(f in d&&b.call(c,d[f],f,d))return!0;return!1}function m(a,b,c){if(a&&U&&U===a.map)return a.map(b,c);if(!N(a)||"function"!=typeof b)throw new TypeError;for(var d=Object(a),e=d.length>>>0,f=[],g=0;e>g;g++)g in d&&f.push(b.call(c,d[g],g,d));return f}function n(a,b,c){var d=arguments.length>2;if(a&&V&&V===a.reduce)return d?a.reduce(b,c):a.reduce(b);if(!N(a)||"function"!=typeof b)throw new TypeError;var e=0,f=a.length>>0;if(arguments.length<3){if(0===f)throw new TypeError("Array length is 0 and no second argument");c=a[0],e=1}else c=arguments[2];for(;f>e;)e in a&&(c=b.call(void 0,c,a[e],e,a)),++e;return c}function o(a,b,c){var d=arguments.length>2;if(a&&W&&W===a.reduceRight)return d?a.reduceRight(b,c):a.reduceRight(b);if(!N(a)||"function"!=typeof b)throw new TypeError;var e=Object(a),f=e.length>>>0;if(0===f&&2===arguments.length)throw new TypeError;var g=f-1;if(arguments.length>=3)c=arguments[2];else for(;;)if(g in a){c=a[g--];break}for(;g>=0;)g in e&&(c=b.call(void 0,c,e[g],g,e)),g--;return c}function p(a){var c=[];if(null!==a){var d=$(arguments);if(1===d.length)if(N(a))c=a;else if(b.isHash(a))for(var e in a)a.hasOwnProperty(e)&&c.push([e,a[e]]);else c.push(a);else j(d,function(a){c=c.concat(p(a))})}return c}function q(a){return a=a||[],a.length?n(a,function(a,b){return a+b}):0}function r(a){if(a=a||[],a.length){var c=q(a);if(b.isNumber(c))return c/a.length;throw new Error("Cannot average an array of non numbers.")}return 0}function s(a,b){return _(a,b)}function t(a,b){return _(a,b)[0]}function u(a,b){return _(a,b)[a.length-1]}function v(a){var b=a,c=J($(arguments,1));return N(a)&&(b=i(a,function(a){return-1===g(c,a)})),b}function w(a){var b,c=[],d=-1,e=0;if(a)for(b=a.length;++d0?(c.push(c.shift()),b--):(c.unshift(c.pop()),b++),y(c,b)):c}function z(a,b){var c=[];if(N(a)){var d=a.slice(0);"number"!=typeof b&&(b=a.length),b?b<=a.length&&(c=n(a,function(a,c,f){var g;return g=b>1?e(c,y(d,f).slice(1),b):[[c]],a.concat(g)},[])):c=[[]]}return c}function A(){var a=[],c=$(arguments);if(c.length>1){var d=c.shift();N(d)&&(a=n(d,function(a,d,e){for(var f=[d],g=0;gd;d++)c.push(a[b[d]]||null);return c}function D(){var a=[],b=$(arguments);if(b.length>1){for(var c=0,d=b.length;d>c;c++)a=a.concat(b[c]);a=w(a)}return a}function E(){var a,b,c=[],d=-1;if(a=arguments.length>1?$(arguments):arguments[0],N(a))for(c=a[0],d=0,b=a.length;++d1?c:p(a),n(b,function(a,b){return a.concat(b)},[])}function K(a,b){b=b.split(".");var c=a.slice(0);return j(b,function(a){var b=a.match(/(\w+)\(\)$/);c=m(c,function(c){return b?c[b[1]]():c[a]})}),c}function L(a,b,c){return c=$(arguments,2),m(a,function(a){var d=M(b)?a[b]:b;return d.apply(a,c)})}var M=b.isString,N=Array.isArray||b.isArray,O=b.isDate,P=Math.floor,Q=Math.abs,R=(Math.max,Math.min),S=Array.prototype,T=(S.indexOf,S.forEach),U=S.map,V=S.reduce,W=S.reduceRight,X=S.filter,Y=S.every,Z=S.some,$=c.argsToArray,_=function(){var a=function(a,b){return k(a,b)},b=function(a,b){return a-b},c=function(a,b){return a.getTime()-b.getTime()};return function(d,e){var f=[];return N(d)&&(f=d.slice(),e?"function"==typeof e?f.sort(e):f.sort(function(a,b){var c=a[e],d=b[e];return M(c)&&M(d)?c>d?1:d>c?-1:0:O(c)&&O(d)?c.getTime()-d.getTime():c-d}):a(f,M)?f.sort():a(f,O)?f.sort(c):f.sort(b)),f}}(),ab={toArray:p,sum:q,avg:r,sort:s,min:t,max:u,difference:v,removeDuplicates:w,unique:x,rotate:y,permutations:z,zip:A,transpose:B,valuesAt:C,union:D,intersect:E,powerSet:F,cartesian:G,compact:H,multiply:I,flatten:J,pluck:K,invoke:L,forEach:j,map:m,filter:i,reduce:n,reduceRight:o,some:l,every:k,indexOf:g,lastIndexOf:h};return a.define(N,ab).expose(ab)}"undefined"!=typeof exports?"undefined"!=typeof module&&module.exports&&(module.exports=a(require("extended"),require("is-extended"),require("arguments-extended"))):"function"==typeof define&&define.amd?define(["extended","is-extended","arguments-extended"],function(b,c,d){return a(b,c,d)}):this.arrayExtended=a(this.extended,this.isExtended,this.argumentsExtended)}.call(this);
\ No newline at end of file
diff --git a/examples/browser/assets/conways.css b/examples/browser/assets/conways.css
index 78a3af0..b4eced4 100644
--- a/examples/browser/assets/conways.css
+++ b/examples/browser/assets/conways.css
@@ -152,6 +152,23 @@ input[type="submit"], input[type="button"] {
     box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.2);
 }
 
+.sudoku .col {
+    width: 50px;
+    height: 50px;
+    font-size: 30px;
+    vertical-align: middle;
+    text-align: center;
+}
+
+.sudoku .col.error {
+    background-color: rgba(255, 0, 0, 0.43);
+}
+
+.sudoku #grid{
+    width: 465px;
+    height: 470px;
+}
+
 .col.live {
     background-color: black;
 }
diff --git a/examples/browser/rules/conways3d.nools b/examples/browser/rules/conways3d.nools
index e9af56a..4f71c5f 100644
--- a/examples/browser/rules/conways3d.nools
+++ b/examples/browser/rules/conways3d.nools
@@ -71,6 +71,8 @@ rule Transition {
             if(cell.transition()){
                 emit("cell-transition", cell);
                 transitioned = true;
+            }else{
+                retract(cell);
             }
         });
         emit("evaluate");
diff --git a/examples/browser/rules/sudoku.nools b/examples/browser/rules/sudoku.nools
new file mode 100644
index 0000000..cd2661f
--- /dev/null
+++ b/examples/browser/rules/sudoku.nools
@@ -0,0 +1,377 @@
+
+rule "terminate group" {
+    salience: -100;
+    agenda-group: "validate";
+    when {
+        $state: String $state == "validate";
+    }
+    then{
+        console.log("Validation complete." );
+        retract($state);
+        halt();
+    }
+}
+
+
+
+rule "duplicate in cell col" {
+    agenda-group: "validate";
+    when{
+        $c: Cell $c.value;
+        $e: Cell $e.value == $c.value from $c.exCells;
+    }
+    then {
+        emit("invalid", $c);
+        emit("invalid", $e);
+    }
+}
+
+
+rule "halt after setup" {
+    when{
+        $ctr: Counter $ctr.count == 0;
+    }
+    then{
+        console.log("halt after setup");
+        halt();
+    }
+}
+
+
+rule "emergency halt 2" {
+    salience: 100;
+    when{
+        $c: Cell !$c.value && $c.count == 0;
+    }
+    then{
+        console.log("emergency halt cell without a value and no free values");
+        halt();
+        //process.exit();
+    }
+
+}
+
+// A Setting object is inserted to define the value of a Cell.
+// Rule "set a value" updates the cell and all cell groups containing it.
+rule "set a value"{
+    when{
+        // a Setting with row and column number, and a value
+        $s: Setting {rowNo: $rn, colNo: $cn, value: $v};
+
+        // a matching Cell, with no value set
+        $c: Cell $c.rowNo == $rn && $c.colNo == $cn && !$c.value {cellRow: $cr, cellCol: $cc, cellSqr: $cs};
+    }
+    then {
+        // modify the Cell by setting its value
+        modify( $c, function(){ this.blockExcept(); this.value = $v;});
+        emit("set-value", $c);
+        console.log( "set cell " + $c.toString() );
+        modify( $cr, function(){ this.blockValue( $v ) });
+        modify( $cc, function(){ this.blockValue( $v ) });
+        modify( $cs, function(){ this.blockValue( $v ) });
+    }
+}
+
+
+// Rule for removing a value from all cells that are siblings
+// in one of the three cell groups.
+rule "eliminate a value from Cell" {
+    salience: 1;
+    when{
+        // a Setting with row and column number, and a value
+        $s: Setting {rowNo: $rn, colNo: $cn, value: $v};
+
+        // the matching Cell, with the value already set
+        $mc : Cell $mc.rowNo == $rn && $mc.colNo == $cn && $mc.value == $v {exCells: $exCells};
+
+        // for all Cells that are in cahoots with the updated cell
+        $c: Cell $v in $c.free from $exCells;
+    }
+    then{
+        console.log( "clear " + $v + " from cell " + $c.posAsString() + " because of " + $mc.posAsString() );
+        // modify a related Cell by blocking the assigned value
+        modify( $c, function(){ this.blockValue( $v ); });
+    }
+}
+
+//Rule for elimination the Setting fact.
+rule "retract setting"{
+    when {
+        // a Setting with row and column number, and a value
+        $s: Setting {rowNo: $rn, colNo: $cn, value: $v};
+
+        // the matching Cell, with the value already set
+        $c: Cell $c.rowNo == $rn && $c.colNo == $cn && $c.value == $v;
+
+        // This is the negation of the last pattern in the previous rule.
+        // Now the Setting fact can be safely retracted.
+        not( $x: Cell $v in $x.free && $x in $c.exCells);
+        // count down
+        $ctr: Counter {count: $count};
+
+    }
+    then{
+        console.log("retracting " + $s.toString());
+        // Discard the Setter fact.
+        retract( $s );
+        console.log("COUNT = %s", $count);
+        modify( $ctr, function(){ this.count = $count - 1;});
+        console.log( "done setting cell " + $c.toString() );
+    }
+}
+
+
+// Detect a set of candidate values with cardinality 1 for some Cell.
+// This is the value to be set.
+rule "single"{
+    when {
+        // There is currently no setting under way.
+        not($ns: Setting);
+
+        // One element in the "free" set.
+        $c: Cell $c.count == 1 {rowNo: $rn, colNo: $cn};
+    }
+    then {
+        var i  = $c.freeValue();
+        console.log( "single " + i + " at " + $c.posAsString() );
+        // Insert another Setter fact.
+        assert( new Setting( $rn, $cn, i ) );
+    }
+}
+
+// Detect a set of candidate values with a value that is the only one
+// in one of its groups. This is the value to be set.
+rule "hidden single" {
+    when{
+        // There is currently no setting under way.
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        // Some integer.
+        $i: Number;
+
+        // The "free" set contains this number.
+        $c: Cell  $c.count > 1 && $i in $c.free {rowNo: $rn, colNo: $cn};
+
+        // We have a cell group containing this cell $c
+        $cg: CellGroup $c in $cg.cells;
+        // but no other cell from that group contains $i
+        not ($nc2: Cell $nc2 != $c && $i in $nc2.free from $cg.cells);
+    }
+    then {
+        console.log( "hidden single " + $i + " at " + $c.posAsString() );
+        // Insert another Setter fact.
+        assert( new Setting( $rn, $cn, $i ) );
+    }
+}
+
+
+// A "naked pair" is two cells in some cell group with their sets of
+// permissible values being equal with cardinality 2. These two values
+// can be removed from all other candidate lists in the group.
+rule "naked pair" {
+    when {
+        // There is currently no setting under way.
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+
+        // One cell with two candidates.
+        $c1: Cell $c1.count == 2 {free: $f1, cellRow: $r1, rowNo: $rn1, colNo: $cn1, cellSqr: $b1};
+
+        // The containing cell group.
+        $cg: CellGroup  $cg.count > 2 && $c1 in $cg.cells;
+
+        // Another cell with two candidates, not the one we already have.
+        $c2: Cell( $c2 != $c1 && deepEqual($c2.free, $f1) ) from $cg.cells;
+
+        // Get one of the "naked pair".
+        $v: Number from $c1.free;
+
+        // Get some other cell with a candidate equal to one from the pair.
+        $c3: Cell $c3 != $c1 && $c3 != $c2 && $c3.count > 1 &&  $v in $c3.free from $cg.cells;
+    }
+    then{
+        console.log( "remove " + $v + " from " + $c3.posAsString() + " due to naked pair at " + $c1.posAsString() + ":[" + $f1.join(",") + "] and " + $c2.posAsString() + ":[" + $c2.free.join(",") + "]" );
+        // Remove the value.
+        modify( $c3, function(){ this.blockValue( $v ); });
+    }
+}
+
+// If two cells within the same cell group contain candidate sets with more than
+// two values, with two values being in both of them but in none of the other
+// cells, then we have a "hidden pair". We can remove all other candidates from
+// these two cells.
+//
+rule "hidden pair in row" {
+    when{
+        // There is currently no setting under way.
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        // Establish a pair of Integer facts
+        $i1: Number;
+        $i2: Number $i2 > $i1;
+
+        // Look for a Cell with these two among its candidates. (The upper bound on
+        // the number of candidates avoids a lot of useless work during startup.)
+        $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellRow: $cellRow};
+
+        // Get another one from the same row, with the same pair among its candidates,
+        $c2: Cell $c2 != $c1 && $c2.cellRow == $cellRow && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free;
+
+        // Assertain that no other cell in the group has one of these two values.
+        not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellRow.cells)
+     }
+    then{
+        console.log( "hidden pair in row at " + $c1.posAsString() + " and " + $c2.posAsString() );
+        // Set the candidate lists of these two Cells to the "hidden pair".
+        modify( $c1, function(){this.blockExcept([$i1, $i2]) });
+        modify( $c2, function(){this.blockExcept([$i1, $i2]) });
+    }
+}
+
+rule "hidden pair in column"{
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i1: Number;
+        $i2: Number $i2 > $i1;
+
+        $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellCol: $cellCol};
+        $c2: Cell $c2 != $c1 && $c2.cellCol == $cellCol && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free;
+        not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellCol.cells)
+    }
+    then{
+        console.log( "hidden pair in column at " + $c1.posAsString() + " and " + $c2.posAsString() );
+        modify( $c1, function(){this.blockExcept([$i1, $i2]) });
+        modify( $c2, function(){this.blockExcept([$i1, $i2]) });
+    }
+}
+
+rule "hidden pair in square" {
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i1: Number;
+        $i2: Number $i2 > $i1;
+
+        $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellSqr: $cellSqr};
+        $c2: Cell $c2 != $c1 && $c2.cellSqr == $cellSqr && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free;
+
+        not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellSqr.cells)
+    }
+    then{
+        console.log( "hidden pair in square " + $c1.posAsString() + " and " + $c2.posAsString() );
+        modify( $c1, function(){this.blockExcept([$i1, $i2]) });
+        modify( $c2, function(){this.blockExcept([$i1, $i2]) });
+    }
+}
+
+
+rule "X-wings in rows" {
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+
+        $ca1: Cell $ca1.count > 1 && $i in $ca1.free {cellRow: $ra, rowNo: $rano, cellCol: $c1,colNo: $c1no};
+        $cb1: Cell $cb1.count > 1 && $i in $cb1.free && $cb1.rowNo > $rano && $cb1.cellCol == $c1 {cellRow: $rb, rowNo: $rbno};
+        not($nc2: Cell $nc2 != $ca1 && $nc2 != $cb1 && $i in $nc2.free from $c1.cells);
+
+        $ca2: Cell $ca2.count > 1 && $1 in $ca2.free && $ca2.cellRow == $ra && $ca2.colNo > $c1no {cellCol: $c2, colNo: $c2no};
+        $cb2: Cell $cb2.count > 1 && $i in $cb2.free && $cb2.cellRow == $rb && $cb2.cellCol == $c2;
+        not($nc3: Cell $nc3 != $ca2 && $nc3 != $cb2 && $i in $nc3.free from $c2.cells);
+
+        $cx: Cell ($cx.rowNo == $rano || $cx.rowNo == $rbno) && $cx.colNo != $c1no && $cx.colNo != $c2no && $cx.count > 1 && $i in $cx.free;
+    }
+    then{
+
+            console.log( "X-wing with " + $i + " in rows " +
+                $ca1.posAsString() + " - " + $cb1.posAsString() +
+                $ca2.posAsString() + " - " + $cb2.posAsString() + ", remove from " + $cx.posAsString() );
+
+       modify( $cx, function(){ this.blockValue( $i ) });
+    }
+}
+
+rule "X-wings in columns"{
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+
+
+        $ca1: Cell $ca1.count > 1 && $i in $ca1.free {cellRow: $ra, rowNo: $rano, cellCol: $c1,colNo: $c1no};
+
+        $ca2: Cell $ca2.count > 1 && $i in $ca2.free && $ca2.colNo > $c1No && $ca2.cellRow == $ra  {cellCol: $c2, colNo: $c2no};
+        not( $nc2: Cell $nc2 != $ca1 && $nc2 != $ca2 && $i in $nc2.free from $ra.cells);
+
+        $cb1: Cell $cb1.count > 1 && $i in  $cb1.free && $cb1.cellCol == $c1 && $cb1.rowNo > $rano {cellRow: $rb,  rowNo: $rbno};
+        $cb2: Cell $cb2.count > 1 && $i in $cb2.free && $cb2.cellCol == $c2 && $cb2.cellRow == $rb;
+        not($nc3: Cell $nc3 != $cb1 && $nc3 != $cb2 && $i in $nc3.free from $rb.cells);
+
+        $cx: Cell ($cx.colNo == $c1no || $cx.colNo == $c2no) && $cx.rowNo != $rano && $cx.rowNo != $rbno && $cx.count > 1 && $i in $cx.free;
+    }
+    then{
+
+            console.log( "X-wing with " + $i + " in columns " +
+                $ca1.posAsString() + " - " + $ca2.posAsString() +
+                $cb1.posAsString() + " - " + $cb2.posAsString() + ", remove from " + $cx.posAsString()  );
+
+        modify( $cx, function(){this.blockValue( $i ) });
+    }
+}
+
+rule "intersection removal column" {
+    when {
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+
+        // occurs in a Cell
+        $c: Cell $i in $c.free {cellSqr: $cs, cellCol: $cc};
+        // but not in another cell of the same square and a different column
+        not($nc2: Cell $nc2 != $c && $i in $nc2.free && $nc2.cellSqr == $cs && $nc2.cellCol != $cc );
+
+        // but there is a cell in the same column and another sqstuare containing this value
+        $cx: Cell $cx.count > 1 && $i in $cx.free && $cx.cellCol == $cc && $cx.cellSqr != $cs;
+    }
+    then{
+        // remove the value from that other cell
+        //if (explain) {
+            console.log( "column elimination due to " + $c.posAsString() +
+                            ": remove " + $i + " from " + $cx.posAsString() );
+        //}
+        modify( $cx, function(){this.blockValue( $i ) });
+    }
+}
+
+rule "intersection removal row"{
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+        // occurs in a Cell
+        $c: Cell $i in  $c.free {cellSqr: $cs, cellRow: $cr};
+        // but not in another cell of the same square and a different row
+        not($nc2: Cell $nc2 != $c && $i in $nc2.free && $nc2.cellSqr == $cs && $nc2.cellRow != $cr);
+
+        // but there is a cell in the same row and another square containing this value
+        $cx: Cell  $cx.count > 1 && $i in $cx.free && $cx.cellRow == $cr && $cx.cellSqr != $cs;
+    }
+    then {
+        // remove the value from that other cell
+        //if (explain) {
+            console.log( "row elimination due to " + $c.posAsString() +
+                                ": remove " + $i + " from " + $cx.posAsString() );
+        //}
+        modify( $cx, function(){ this.blockValue( $i ) });
+    }
+}
diff --git a/examples/browser/src/sudoku.js b/examples/browser/src/sudoku.js
new file mode 100644
index 0000000..31da919
--- /dev/null
+++ b/examples/browser/src/sudoku.js
@@ -0,0 +1,368 @@
+(function () {
+    /*global $:true*/
+    var declare = this.declare,
+        arr = this.arrayExtended,
+        unique = arr.unique;
+
+    var allNine = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+
+    var SetOfNine = declare({
+        instance: {
+
+            free: null,
+            count: 0,
+
+            constructor: function () {
+                this.count = (this.free = allNine.slice()).length;
+            },
+
+            blockValue: function (value) {
+                var index = arr.indexOf(this.free, value);
+                if (index !== -1) {
+                    this.free.splice(index, 1);
+                    this.count = this.free.length;
+                }
+                return this;
+            },
+
+            blockExcept: function (values) {
+                this.free = values || [];
+                this.count = this.free.length;
+                return this;
+            },
+
+            freeValue: function () {
+                return this.free[0];
+            }
+        }
+    }).as(this, "SetOfNine");
+
+    var CellGroup = SetOfNine.extend({
+        instance: {
+            cells: null,
+
+            constructor: function () {
+                this._super(arguments);
+                this.cells = [];
+            },
+
+            addCell: function (cell) {
+                this.cells.push(cell);
+            }
+        }
+    }).as(this, "CellGroup");
+
+
+    var CellFile = CellGroup.extend({
+        instance: {
+            number: null,
+
+            constructor: function (number) {
+                this._super(arguments);
+                this.number = number;
+            },
+
+            toString: function () {
+                var ret = [], cells = this.cells;
+                for (var i = 0, l = cells.length; i < l; i++) {
+                    ret.push(cells[i].toString());
+                }
+                return ret.join(", ");
+            }
+        }
+    }).as(this, "CellFile");
+
+    var Cell = SetOfNine.extend({
+        instance: {
+            value: null,
+            cellRow: null,
+            cellCol: null,
+            cellSqr: null,
+            exCells: null,
+            el: null,
+
+            constructor: function () {
+                this._super(arguments);
+                this.exCells = [];
+            },
+
+            makeReferences: function (cr, col, sqr) {
+                this.cellRow = cr;
+                this.cellCol = col;
+                this.cellSqr = sqr;
+                this.colNo = col.number;
+                this.rowNo = cr.number;
+                this.exCells = unique(this.exCells.concat(cr.cells).concat(col.cells).concat(sqr.cells));
+                this.exCells.splice(this.exCells.indexOf(this), 1);
+                return this;
+            },
+
+            toString: function () {
+                return [this.posAsString(), this.valueAsString()].join(": ");
+            },
+
+            valueAsString: function () {
+                return this.value === null ? " ": this.value;
+            },
+
+            posAsString: function () {
+                return ["[", this.cellRow.number, ",", this.cellCol.number, "]"].join("");
+            }
+        }
+    }).as(this, "Cell");
+
+    var CellCol = CellFile.extend({
+        instance: {
+            toString: function () {
+                return ["Column ", this.number, ": ", this._super(arguments)];
+            }
+        }
+    }).as(this, "CellCol");
+
+
+    var CellRow = CellFile.extend({
+        instance: {
+            toString: function () {
+                return ["Row ", this.number, ": ", this._super(arguments)];
+            }
+        }
+    }).as(this, "CellRow");
+
+    var CellSqr = CellGroup.extend({
+        instance: {
+            constructor: function (cr1, cr2, cr3, cc1, cc2, cc3) {
+                this._super(arguments);
+                for (var i = cr1.number; i <= cr3.number; i++) {
+                    this.addCell(cc1.cells[i]);
+                    this.addCell(cc2.cells[i]);
+                    this.addCell(cc3.cells[i]);
+                }
+
+            }
+        }
+    }).as(this, "CellSqr");
+
+    var Counter = declare({
+        instance: {
+            count: 0,
+            constructor: function (count) {
+                this.count = count;
+            }
+        }
+    }).as(this, "Counter");
+
+
+    var Setting = declare({
+        instance: {
+            rowNo: null,
+            colNo: null,
+            value: null,
+
+            constructor: function (row, col, value) {
+                this.rowNo = row;
+                this.colNo = col;
+                this.value = value;
+            },
+
+            toString: function () {
+                return "Setting [" + this.rowNo + "," + this.colNo + "] : " + this.value;
+            }
+
+        }
+    }).as(this, "Setting");
+
+
+    var Stepping = declare({
+        instance: {
+            emergency: false
+        }
+    }).as(this, "Stepping");
+
+    var Sudoku = declare({
+        instance: {
+
+            constructor: function (flow, statsListener) {
+                this.rows = [];
+                this.cols = [];
+                this.sqrs = [];
+                this.cells = [];
+                this.flow = flow;
+                this.statsListener = statsListener;
+                this.session = null;
+                this.stepping = null;
+            },
+
+            stop: function () {
+                if (this.session) {
+                    this.session.halt();
+                    this.session.dispose();
+                }
+                return this;
+            },
+
+            clear: function () {
+                this.stop();
+                this.setCellValues([]);
+            },
+
+            step: function () {
+                this.session.modify(this.counter, function () {
+                    this.count = 1;
+                });
+                if (!this.stepping) {
+                    this.session.assert(new Stepping());
+                }
+                return this.session.matchUntilHalt(function (err) {
+                    if (err) {
+                        console.log(err);
+                    }
+                });
+            },
+
+            solve: function () {
+                this.session.modify(this.counter, function () {
+                    this.count = Infinity;
+                });
+                if (this.stepping) {
+                    this.session.retract(this.stepping);
+                }
+                return this.session.match(function (err) {
+                    if (err) {
+                        console.log(err);
+                    }
+                });
+            },
+
+            setCellValue: function setCellValue(cell) {
+                cell.el.text(cell.value ? cell.value: "");
+                return cell;
+            },
+
+            create: function () {
+                var grid;
+                (grid = $("#grid")).empty();
+                var rows = this.rows, cols = this.cols, sqrs = this.sqrs, session = this.session;
+                for (var i = 0; i < 9; i++) {
+                    session.assert(i + 1);
+                    rows[i] = new CellRow(i);
+                    cols[i] = new CellCol(i);
+                }
+
+                var cells = this.cells = [], iCol;
+                for (var iRow = 0; iRow < 9; iRow++) {
+                    var rowDom = $("
      ").addClass("row").appendTo(grid);
+                    cells[iRow] = [];
+                    for (iCol = 0; iCol < 9; iCol++) {
+                        var cell = cells[iRow][iCol] = new Cell();
+                        cell.el = $("
      ").appendTo(rowDom);
+                        rows[iRow].addCell(cell);
+                        cols[iCol].addCell(cell);
+                    }
+                }
+
+                for (i = 0; i < 3; i++) {
+                    sqrs[i] = [];
+                    for (var j = 0; j < 3; j++) {
+                        sqrs[i][j] = new CellSqr(rows[i * 3], rows[i * 3 + 1], rows[i * 3 + 2],
+                            cols[j * 3], cols[j * 3 + 1], cols[j * 3 + 2]);
+                    }
+                }
+
+                for (iRow = 0; iRow < 9; iRow++) {
+                    for (iCol = 0; iCol < 9; iCol++) {
+                        session.assert(cells[iRow][iCol].makeReferences(rows[iRow], cols[iCol], sqrs[Math.floor(iRow / 3)][Math.floor(iCol / 3)]));
+                    }
+                    session.assert(rows[iRow]);
+                    session.assert(cols[iRow]);
+                    session.assert(sqrs[Math.floor(iRow / 3)][iRow % 3]);
+                }
+                return this;
+            },
+
+            setCellValues: function (cellValues) {
+                this.stop();
+                var session = (this.session = this.statsListener.listen(this.flow.getSession()))
+                    .on("set-value", this.setCellValue);
+
+                var s000 = new Setting(0, 0, 0);
+                this.session.assert(s000);
+                this.create();
+
+                var initial = 0;
+                for (var iRow = 0; iRow < 9; iRow++) {
+                    var row = cellValues[iRow] || [];
+                    for (var iCol = 0; iCol < 9; iCol++) {
+                        var value = row[iCol] || null;
+                        if (value) {
+                            session.assert(new Setting(iRow, iCol, value));
+                            initial++;
+                            //console.log(initial);
+                        }
+                    }
+                }
+                var counter = this.counter = new Counter(initial);
+                this.session.assert(counter);
+                this.session.retract(s000);
+                return this.session.matchUntilHalt(function (err) {
+                    if (err) {
+                        console.log(err);
+                    }
+                    this.dumpGrid();
+                }.bind(this));
+            },
+
+            dumpGrid: function () {
+                var cells = this.cells;
+                var print = ["       "];
+                for (var iCol = 0; iCol < 9; iCol++) {
+                    print.push("Col: " + iCol + "     ");
+                }
+                console.log(print.join(""));
+                for (var iRow = 0; iRow < 9; iRow++) {
+                    print = ["Row " + (iRow) + ": "];
+                    for (iCol = 0; iCol < 9; iCol++) {
+                        if (cells[iRow][iCol].value !== null) {
+                            print.push(" --- " + cells[iRow][iCol].value + " --- ");
+                        } else {
+                            var perms = cells[iRow][iCol].free, sb = [];
+                            for (var i = 1; i <= 9; i++) {
+                                if (perms.indexOf(i) !== -1) {
+                                    sb.push(i);
+                                } else {
+                                    sb.push(' ');
+                                }
+                            }
+                            print.push(" %          " + sb.join(""));
+                        }
+                    }
+                    console.log(print.join(""));
+                }
+            },
+
+            setInvalidCellValue: function setCellValue(cell) {
+                cell.el.addClass("error");
+                return cell;
+            },
+
+            validate: function () {
+                this.session.assert("validate");
+                return this.session.focus("validate")
+                    .on("invalid", this.setInvalidCellValue)
+                    .matchUntilHalt();
+            }
+
+        }
+    });
+
+    this.Sudoku = Sudoku;
+}).call(this);
+
+
+
+
+
+
+
+
+
+
diff --git a/examples/browser/src/sudokuPatterns.js b/examples/browser/src/sudokuPatterns.js
new file mode 100644
index 0000000..c73a45c
--- /dev/null
+++ b/examples/browser/src/sudokuPatterns.js
@@ -0,0 +1,90 @@
+(function () {
+
+    this.sudokuExamples = {
+        Simple: [
+            [null, 5, 6, 8, null, 1, 9, 4, null],
+            [9, null, null, 6, null, 5, null, null, 3],
+            [7, null, null, 4, 9, 3, null, null, 8],
+            [8, 9, 7, null, 4, null, 6, 3, 5],
+            [null, null, 3, 9, null, 6, 8, null, null],
+            [4, 6, 5, null, 8, null, 2, 9, 1],
+            [5, null, null, 2, 6, 9, null, null, 7],
+            [6, null, null, 5, null, 4, null, null, 9],
+            [null, 4, 9, 7, null, 8, 3, 5, null]
+        ],
+
+        Medium: [
+            [8, 4, 7, null, null, null, 2, 5, 6],
+            [5, null, null, null, 8, null, null, null, 4],
+            [2, null, null, null, 7, null, null, null, 8],
+            [null, null, null, 3, null, 8, null, null, null],
+            [null, 5, 1, null, null, null, 8, 7, 2],
+            [null, null, null, 5, null, 7, null, null, null],
+            [4, null, null, null, 5, null, null, null, 7],
+            [6, null, null, null, 3, null, null, null, 9],
+            [1, 3, 2, null, null, null, 4, 8, 5]
+        ],
+
+        "Hard 1": [
+            [null, null, null, null, 5, 1, null, 8, null],
+            [null, 8, null, null, 4, null, null, null, 5],
+            [null, null, 3, null, null, null, 2, null, null],
+            [null, null, null, null, 6, null, null, null, 9],
+            [6, 7, null, 4, null, 9, null, 1, 3],
+            [8, null, null, null, 3, null, null, null, null],
+            [null, null, 2, null, null, null, 4, null, null],
+            [5, null, null, null, 9, null, null, 2, null],
+            [null, 9, null, 7, 1, null, null, null, null]
+        ],
+
+        "Hard 2": [
+            [null, null, null, 6, null, null, 1, null, null],
+            [null, null, null, null, null, 5, null, null, 6],
+            [5, null, 7, null, null, null, 2, 3, null],
+            [null, 8, null, 9, null, 7, null, null, null],
+            [9, 3, null, null, null, null, null, 6, 7],
+            [null, null, null, 4, null, 6, null, 1, null],
+            [null, 7, 4, null, null, null, 9, null, 1],
+            [8, null, null, 7, null, null, null, null, null],
+            [null, null, 3, null, null, 8, null, null, null]
+        ],
+
+        "Hard 3": [
+            [null, 8, null, null, null, 6, null, null, 5],
+            [2, null, null, null, null, null, 4, 8, null],
+            [null, null, 9, null, null, 8, null, 1, null],
+            [null, null, null, null, 8, null, 1, null, 2],
+            [null, null, null, 3, null, 1, null, null, null],
+            [6, null, 1, null, 9, null, null, null, null],
+            [null, 9, null, 4, null, null, 8, null, null],
+            [null, 7, 6, null, null, null, null, null, 3],
+            [1, null, null, 7, null, null, null, 5, null]
+        ],
+
+        "Hard 4": [
+            [null, null, null, null, null, 4, null, 9, 5],
+            [6, 7, null, 5, null, null, null, 1, null],
+            [null, null, null, 6, null, 9, null, null, null],
+            [null, 2, null, null, null, null, 4, null, null],
+            [8, 1, null, null, null, null, null, 7, 2],
+            [null, null, 7, null, null, null, null, 8, null],
+            [null, null, null, 3, null, 5, null, null, null],
+            [null, 6, null, null, null, 1, null, 5, 8],
+            [7, 3, null, 9, null, null, null, null, null]
+        ],
+
+        "Broken": [
+            [5, null, null, null, null, 4, null, 9, 5],
+            [6, 7, null, 5, null, null, null, 1, null],
+            [null, null, null, 6, null, 9, null, null, null],
+            [null, 2, null, null, null, null, 4, null, null],
+            [8, 1, null, null, null, null, null, 7, 2],
+            [null, null, 7, null, null, null, null, 8, null],
+            [8, null, null, 3, null, 5, null, null, null],
+            [null, 6, null, null, null, 1, null, 5, 8],
+            [7, 3, null, 9, null, null, null, null, null]
+        ]
+
+    };
+
+}).call(this);
\ No newline at end of file
diff --git a/examples/browser/sudoku.html b/examples/browser/sudoku.html
new file mode 100644
index 0000000..81afdba
--- /dev/null
+++ b/examples/browser/sudoku.html
@@ -0,0 +1,146 @@
+
+
+
+    
+    
+    Sudoku
+    
+    
+    
+
+
+
+
      
+    
      
+        
      Sudoku
      
+
+        
      
+            
+            
+            
+            
+            
+            
+        
      
+    
      
+    
      
+
      
+
+
      
+    
      
+
      
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/examples/counter/counter.nools b/examples/counter/counter.nools
index c0f71ad..77c3673 100644
--- a/examples/counter/counter.nools
+++ b/examples/counter/counter.nools
@@ -26,7 +26,7 @@ rule "not count" {
     }
 }
 
-rule count {
+rule count1 {
     when{
         $ctr: Counter $ctr.count % 1000 == 0 {count: $count}
     }
@@ -36,7 +36,7 @@ rule count {
     }
 }
 
-rule count {
+rule count2 {
     when{
         $ctr: Counter {count: $count}
     }
diff --git a/examples/counter/index.js b/examples/counter/index.js
index 1653efb..7715a42 100644
--- a/examples/counter/index.js
+++ b/examples/counter/index.js
@@ -4,4 +4,7 @@ var flow = nools.compile(require.resolve("./counter.nools"));
 
 flow.getSession().matchUntilHalt().then(function () {
     //halt finally invoked
+    console.log("done");
+}, function () {
+    console.log(err);
 });
diff --git a/examples/sudoku/index.js b/examples/sudoku/index.js
new file mode 100644
index 0000000..1524f48
--- /dev/null
+++ b/examples/sudoku/index.js
@@ -0,0 +1,121 @@
+var nools = require("../../index.js"),
+    sudoku = require("./lib/sudoku");
+
+var flow = nools.compile(require.resolve("./lib/rules/sudoku.nools"), {
+    define: {
+        CellGroup: sudoku.CellGroup,
+        Cell: sudoku.Cell,
+        CellCol: sudoku.CellCol,
+        CellRow: sudoku.CellCol,
+        CellSqr: sudoku.CellSqr,
+        Counter: sudoku.Counter,
+        Setting: sudoku.Setting,
+        Stepping: sudoku.Stepping
+    },
+    scope: {
+        explain: true
+    }
+});
+
+
+var simple = [
+    [null, 5, 6, 8, null, 1, 9, 4, null],
+    [9, null, null, 6, null, 5, null, null, 3],
+    [7, null, null, 4, 9, 3, null, null, 8],
+    [8, 9, 7, null, 4, null, 6, 3, 5],
+    [null, null, 3, 9, null, 6, 8, null, null],
+    [4, 6, 5, null, 8, null, 2, 9, 1],
+    [5, null, null, 2, 6, 9, null, null, 7],
+    [6, null, null, 5, null, 4, null, null, 9],
+    [null, 4, 9, 7, null, 8, 3, 5, null]
+];
+
+var medium = [
+    [8, 4, 7, null, null, null, 2, 5, 6],
+    [5, null, null, null, 8, null, null, null, 4],
+    [2, null, null, null, 7, null, null, null, 8],
+    [null, null, null, 3, null, 8, null, null, null],
+    [null, 5, 1, null, null, null, 8, 7, 2],
+    [null, null, null, 5, null, 7, null, null, null],
+    [4, null, null, null, 5, null, null, null, 7],
+    [6, null, null, null, 3, null, null, null, 9],
+    [1, 3, 2, null, null, null, 4, 8, 5]
+];
+
+var hard1 = [
+    [null, null, null, null, 5, 1, null, 8, null],
+    [null, 8, null, null, 4, null, null, null, 5],
+    [null, null, 3, null, null, null, 2, null, null],
+    [null, null, null, null, 6, null, null, null, 9],
+    [6, 7, null, 4, null, 9, null, 1, 3],
+    [8, null, null, null, 3, null, null, null, null],
+    [null, null, 2, null, null, null, 4, null, null],
+    [5, null, null, null, 9, null, null, 2, null],
+    [null, 9, null, 7, 1, null, null, null, null]
+];
+
+var hard2 = [
+    [null, null, null, 6, null, null, 1, null, null],
+    [null, null, null, null, null, 5, null, null, 6],
+    [5, null, 7, null, null, null, 2, 3, null],
+    [null, 8, null, 9, null, 7, null, null, null],
+    [9, 3, null, null, null, null, null, 6, 7],
+    [null, null, null, 4, null, 6, null, 1, null],
+    [null, 7, 4, null, null, null, 9, null, 1],
+    [8, null, null, 7, null, null, null, null, null],
+    [null, null, 3, null, null, 8, null, null, null]
+];
+
+var hard3 = [
+    [null, 8, null, null, null, 6, null, null, 5],
+    [2, null, null, null, null, null, 4, 8, null],
+    [null, null, 9, null, null, 8, null, 1, null],
+    [null, null, null, null, 8, null, 1, null, 2],
+    [null, null, null, 3, null, 1, null, null, null],
+    [6, null, 1, null, 9, null, null, null, null],
+    [null, 9, null, 4, null, null, 8, null, null],
+    [null, 7, 6, null, null, null, null, null, 3],
+    [1, null, null, 7, null, null, null, 5, null]
+];
+
+var hard4 = [
+    [null, null, null, null, null, 4, null, 9, 5],
+    [6, 7, null, 5, null, null, null, 1, null],
+    [null, null, null, 6, null, 9, null, null, null],
+    [null, 2, null, null, null, null, 4, null, null],
+    [8, 1, null, null, null, null, null, 7, 2],
+    [null, null, 7, null, null, null, null, 8, null],
+    [null, null, null, 3, null, 5, null, null, null],
+    [null, 6, null, null, null, 1, null, 5, 8],
+    [7, 3, null, 9, null, null, null, null, null]
+];
+
+var sud = new sudoku.Sudoku(flow);
+var repl = require("repl");
+sud.setCellValues(hard4).then(function () {
+    var sudokuRepl = repl.start("sudoku>>");
+    sudokuRepl.context.print = sud.dumpGrid.bind(sud);
+    sudokuRepl.context.step = function () {
+        sud.step().classic(function (err) {
+            if (err) {
+                console.log(err.stack);
+            } else {
+                sud.dumpGrid();
+            }
+        });
+    };
+    sudokuRepl.context.solve = function () {
+        sud.solve().classic(function (err) {
+            if (err) {
+                console.log(err.stack);
+            } else {
+                sud.dumpGrid();
+            }
+            process.exit();
+        });
+    };
+});
+
+
+
+
diff --git a/examples/sudoku/lib/rules/sudoku.nools b/examples/sudoku/lib/rules/sudoku.nools
new file mode 100644
index 0000000..088a4f5
--- /dev/null
+++ b/examples/sudoku/lib/rules/sudoku.nools
@@ -0,0 +1,386 @@
+
+rule "halt after setup" {
+//   salience: 9;
+    when{
+//        not($s: Setting);
+        $ctr: Counter $ctr.count == 0;
+    }
+    then{
+        console.log("halt after setup");
+        halt();
+    }
+}
+
+//rule "emergency halt" {
+//    salience: -100;
+//    when{
+//        $s: Stepping;
+//    }
+//    then{
+//        console.log("emergency halt");
+//        modify($s, function(){
+//            this.emergency = true;
+//        });
+//        halt();
+//    }
+//
+//}
+
+rule "emergency halt 2" {
+    salience: 100;
+    when{
+        $c: Cell !$c.value && $c.count == 0;
+    }
+    then{
+        console.log("emergency halt cell without a value and no free values");
+        halt();
+        //process.exit();
+    }
+
+}
+
+// A Setting object is inserted to define the value of a Cell.
+// Rule "set a value" updates the cell and all cell groups containing it.
+rule "set a value"{
+    when{
+        // a Setting with row and column number, and a value
+        $s: Setting {rowNo: $rn, colNo: $cn, value: $v};
+
+        // a matching Cell, with no value set
+        $c: Cell $c.rowNo == $rn && $c.colNo == $cn && !$c.value {cellRow: $cr, cellCol: $cc, cellSqr: $cs};
+    }
+    then {
+        // modify the Cell by setting its value
+        emit("set-value", $c);
+        modify( $c, function(){ this.blockExcept(); this.value = $v;});
+        console.log( "set cell " + $c.toString() );
+        modify( $cr, function(){ this.blockValue( $v ) });
+        modify( $cc, function(){ this.blockValue( $v ) });
+        modify( $cs, function(){ this.blockValue( $v ) });
+    }
+}
+
+
+// Rule for removing a value from all cells that are siblings
+// in one of the three cell groups.
+rule "eliminate a value from Cell" {
+    salience: 1;
+    when{
+        // a Setting with row and column number, and a value
+        $s: Setting {rowNo: $rn, colNo: $cn, value: $v};
+
+        // the matching Cell, with the value already set
+        $mc : Cell $mc.rowNo == $rn && $mc.colNo == $cn && $mc.value == $v {exCells: $exCells};
+
+        // for all Cells that are in cahoots with the updated cell
+        $c: Cell $v in $c.free from $exCells;
+    }
+    then{
+        console.log( "clear " + $v + " from cell " + $c.posAsString() + " because of " + $mc.posAsString() );
+        // modify a related Cell by blocking the assigned value
+        modify( $c, function(){ this.blockValue( $v ); });
+    }
+}
+
+//Rule for elimination the Setting fact.
+rule "retract setting"{
+//    salience: 8;
+    when {
+        // a Setting with row and column number, and a value
+        $s: Setting {rowNo: $rn, colNo: $cn, value: $v};
+
+        // the matching Cell, with the value already set
+        $c: Cell $c.rowNo == $rn && $c.colNo == $cn && $c.value == $v;
+
+        // This is the negation of the last pattern in the previous rule.
+        // Now the Setting fact can be safely retracted.
+        not( $x: Cell $v in $x.free && $x in $c.exCells);
+        // count down
+        $ctr: Counter {count: $count};
+
+    }
+    then{
+        console.log("retracting " + $s.toString());
+        // Discard the Setter fact.
+        retract( $s );
+        console.log("COUNT = %s", $count);
+        modify( $ctr, function(){ this.count = $count - 1;});
+        console.log( "done setting cell " + $c.toString() );
+    }
+}
+
+
+// Detect a set of candidate values with cardinality 1 for some Cell.
+// This is the value to be set.
+rule "single"{
+//    salience: 7;
+    when {
+        // There is currently no setting under way.
+        not($ns: Setting);
+
+        // One element in the "free" set.
+        $c: Cell $c.count == 1 {rowNo: $rn, colNo: $cn};
+    }
+    then {
+        var i  = $c.freeValue();
+        console.log( "single " + i + " at " + $c.posAsString() );
+        // Insert another Setter fact.
+        assert( new Setting( $rn, $cn, i ) );
+    }
+}
+
+// Detect a set of candidate values with a value that is the only one
+// in one of its groups. This is the value to be set.
+rule "hidden single" {
+//    salience: 6;
+    when{
+        // There is currently no setting under way.
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        // Some integer.
+        $i: Number;
+
+        // The "free" set contains this number.
+        $c: Cell  $c.count > 1 && $i in $c.free {rowNo: $rn, colNo: $cn};
+
+        // We have a cell group containing this cell $c
+        $cg: CellGroup $c in $cg.cells;
+        // but no other cell from that group contains $i
+        not ($nc2: Cell $nc2 != $c && $i in $nc2.free from $cg.cells);
+    }
+    then {
+        console.log( "hidden single " + $i + " at " + $c.posAsString() );
+        // Insert another Setter fact.
+        assert( new Setting( $rn, $cn, $i ) );
+    }
+}
+
+
+// A "naked pair" is two cells in some cell group with their sets of
+// permissible values being equal with cardinality 2. These two values
+// can be removed from all other candidate lists in the group.
+rule "naked pair" {
+//    salience: 5;
+    when {
+        // There is currently no setting under way.
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+
+        // One cell with two candidates.
+        $c1: Cell $c1.count == 2 {free: $f1, cellRow: $r1, rowNo: $rn1, colNo: $cn1, cellSqr: $b1};
+
+        // The containing cell group.
+        $cg: CellGroup  $cg.count > 2 && $c1 in $cg.cells;
+
+        // Another cell with two candidates, not the one we already have.
+        $c2: Cell( $c2 != $c1 && deepEqual($c2.free, $f1) ) from $cg.cells;
+
+        // Get one of the "naked pair".
+        $v: Number from $c1.free;
+
+        // Get some other cell with a candidate equal to one from the pair.
+        $c3: Cell $c3 != $c1 && $c3 != $c2 && $c3.count > 1 &&  $v in $c3.free from $cg.cells;
+    }
+    then{
+        console.log( "remove " + $v + " from " + $c3.posAsString() + " due to naked pair at " + $c1.posAsString() + ":[" + $f1.join(",") + "] and " + $c2.posAsString() + ":[" + $c2.free.join(",") + "]" );
+        // Remove the value.
+        modify( $c3, function(){ this.blockValue( $v ); });
+    }
+}
+
+// If two cells within the same cell group contain candidate sets with more than
+// two values, with two values being in both of them but in none of the other
+// cells, then we have a "hidden pair". We can remove all other candidates from
+// these two cells.
+//
+rule "hidden pair in row" {
+//    salience: 4;
+    when{
+        // There is currently no setting under way.
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        // Establish a pair of Integer facts
+        $i1: Number;
+        $i2: Number $i2 > $i1;
+
+        // Look for a Cell with these two among its candidates. (The upper bound on
+        // the number of candidates avoids a lot of useless work during startup.)
+        $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellRow: $cellRow};
+
+        // Get another one from the same row, with the same pair among its candidates,
+        $c2: Cell $c2 != $c1 && $c2.cellRow == $cellRow && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free;
+
+        // Assertain that no other cell in the group has one of these two values.
+        not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellRow.cells)
+     }
+    then{
+        console.log( "hidden pair in row at " + $c1.posAsString() + " and " + $c2.posAsString() );
+        // Set the candidate lists of these two Cells to the "hidden pair".
+        modify( $c1, function(){this.blockExcept([$i1, $i2]) });
+        modify( $c2, function(){this.blockExcept([$i1, $i2]) });
+    }
+}
+
+rule "hidden pair in column"{
+//    salience: 3;
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i1: Number;
+        $i2: Number $i2 > $i1;
+
+        $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellCol: $cellCol};
+        $c2: Cell $c2 != $c1 && $c2.cellCol == $cellCol && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free;
+        not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellCol.cells)
+    }
+    then{
+        console.log( "hidden pair in column at " + $c1.posAsString() + " and " + $c2.posAsString() );
+        modify( $c1, function(){this.blockExcept([$i1, $i2]) });
+        modify( $c2, function(){this.blockExcept([$i1, $i2]) });
+    }
+}
+
+rule "hidden pair in square" {
+//    salience: 2;
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i1: Number;
+        $i2: Number $i2 > $i1;
+
+        $c1: Cell $c1.count > 2 && $c1.count < 9 && $i1 in $c1.free && $i2 in $c1.free {rowNo: $rn1, colNo: $cn1, cellSqr: $cellSqr};
+        $c2: Cell $c2 != $c1 && $c2.cellSqr == $cellSqr && $c2.count > 2 && $i1 in $c2.free && $i2 in $c2.free;
+
+        not($nc2: Cell $nc2 != $c1 && $nc2 != $c2 && ($i1 in $nc2.free || $i2 in $nc2.free ) from $cellSqr.cells)
+    }
+    then{
+        console.log( "hidden pair in square " + $c1.posAsString() + " and " + $c2.posAsString() );
+        modify( $c1, function(){this.blockExcept([$i1, $i2]) });
+        modify( $c2, function(){this.blockExcept([$i1, $i2]) });
+    }
+}
+
+
+rule "X-wings in rows" {
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+
+        $ca1: Cell $ca1.count > 1 && $i in $ca1.free {cellRow: $ra, rowNo: $rano, cellCol: $c1,colNo: $c1no};
+        $cb1: Cell $cb1.count > 1 && $i in $cb1.free && $cb1.rowNo > $rano && $cb1.cellCol == $c1 {cellRow: $rb, rowNo: $rbno};
+        not($nc2: Cell $nc2 != $ca1 && $nc2 != $cb1 && $i in $nc2.free from $c1.cells);
+
+        $ca2: Cell $ca2.count > 1 && $1 in $ca2.free && $ca2.cellRow == $ra && $ca2.colNo > $c1no {cellCol: $c2, colNo: $c2no};
+        $cb2: Cell $cb2.count > 1 && $i in $cb2.free && $cb2.cellRow == $rb && $cb2.cellCol == $c2;
+        not($nc3: Cell $nc3 != $ca2 && $nc3 != $cb2 && $i in $nc3.free from $c2.cells);
+
+        $cx: Cell ($cx.rowNo == $rano || $cx.rowNo == $rbno) && $cx.colNo != $c1no && $cx.colNo != $c2no && $cx.count > 1 && $i in $cx.free;
+    }
+    then{
+
+            console.log( "X-wing with " + $i + " in rows " +
+                $ca1.posAsString() + " - " + $cb1.posAsString() +
+                $ca2.posAsString() + " - " + $cb2.posAsString() + ", remove from " + $cx.posAsString() );
+
+       modify( $cx, function(){ this.blockValue( $i ) });
+    }
+}
+
+rule "X-wings in columns"{
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+
+
+        $ca1: Cell $ca1.count > 1 && $i in $ca1.free {cellRow: $ra, rowNo: $rano, cellCol: $c1,colNo: $c1no};
+
+        $ca2: Cell $ca2.count > 1 && $i in $ca2.free && $ca2.colNo > $c1No && $ca2.cellRow == $ra  {cellCol: $c2, colNo: $c2no};
+        not( $nc2: Cell $nc2 != $ca1 && $nc2 != $ca2 && $i in $nc2.free from $ra.cells);
+
+        $cb1: Cell $cb1.count > 1 && $i in  $cb1.free && $cb1.cellCol == $c1 && $cb1.rowNo > $rano {cellRow: $rb,  rowNo: $rbno};
+        $cb2: Cell $cb2.count > 1 && $i in $cb2.free && $cb2.cellCol == $c2 && $cb2.cellRow == $rb;
+        not($nc3: Cell $nc3 != $cb1 && $nc3 != $cb2 && $i in $nc3.free from $rb.cells);
+
+        $cx: Cell ($cx.colNo == $c1no || $cx.colNo == $c2no) && $cx.rowNo != $rano && $cx.rowNo != $rbno && $cx.count > 1 && $i in $cx.free;
+    }
+    then{
+
+            console.log( "X-wing with " + $i + " in columns " +
+                $ca1.posAsString() + " - " + $ca2.posAsString() +
+                $cb1.posAsString() + " - " + $cb2.posAsString() + ", remove from " + $cx.posAsString()  );
+
+        modify( $cx, function(){this.blockValue( $i ) });
+    }
+}
+
+rule "intersection removal column" {
+//    salience: -1;
+    when {
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+
+        // occurs in a Cell
+        $c: Cell $i in $c.free {cellSqr: $cs, cellCol: $cc};
+        // but not in another cell of the same square and a different column
+        not($nc2: Cell $nc2 != $c && $i in $nc2.free && $nc2.cellSqr == $cs && $nc2.cellCol != $cc );
+
+        // but there is a cell in the same column and another sqstuare containing this value
+        $cx: Cell $cx.count > 1 && $i in $cx.free && $cx.cellCol == $cc && $cx.cellSqr != $cs;
+    }
+    then{
+        // remove the value from that other cell
+        //if (explain) {
+            console.log( "column elimination due to " + $c.posAsString() +
+                            ": remove " + $i + " from " + $cx.posAsString() );
+        //}
+        modify( $cx, function(){this.blockValue( $i ) });
+    }
+}
+
+rule "intersection removal row"{
+//  salience: -2;
+    when{
+        not($ns: Setting);
+        not($nc: Cell $nc.count == 1 );
+
+        $i: Number;
+        // occurs in a Cell
+        $c: Cell $i in  $c.free {cellSqr: $cs, cellRow: $cr};
+        // but not in another cell of the same square and a different row
+        not($nc2: Cell $nc2 != $c && $i in $nc2.free && $nc2.cellSqr == $cs && $nc2.cellRow != $cr);
+
+        // but there is a cell in the same row and another square containing this value
+        $cx: Cell  $cx.count > 1 && $i in $cx.free && $cx.cellRow == $cr && $cx.cellSqr != $cs;
+    }
+    then {
+        // remove the value from that other cell
+        //if (explain) {
+            console.log( "row elimination due to " + $c.posAsString() +
+                                ": remove " + $i + " from " + $cx.posAsString() );
+        //}
+        modify( $cx, function(){ this.blockValue( $i ) });
+    }
+}
+////
+////// Y-wing
+////// $c1: Cell( count == 2 ) contains a, b
+////// $c2: Cell( count == 2 ) contains a, c
+////// $c3: Cell( count == 2 ) contains b, c
+////// //g12: CellGroup() contains $c1, $c2
+////// //g1e: CellGroup() contains $c1, $c3
+////
+////// $cx: Cell( count > 1 ) contains c
+//////  // //g12: CellGroup() contains $c1, $c2
+////
+////
diff --git a/examples/sudoku/lib/rules/validate.nools b/examples/sudoku/lib/rules/validate.nools
new file mode 100644
index 0000000..e79a504
--- /dev/null
+++ b/examples/sudoku/lib/rules/validate.nools
@@ -0,0 +1,42 @@
+
+rule "terminate group" {
+    salience: -100
+    when {}
+    then{
+        console.log("Validation complete." );
+        halt();
+    }
+}
+
+rule "duplicate in cell row" {
+    when{
+        $c: Cell $c.value !== null {$v: value};
+        $cr: CellRow $c in $cr.cells;
+        $e: Cell $e != $c && $e.value == $v && $e.cellRow == $cr;
+    }
+    then{
+        console.log( "cell " + $c.toString() + " has a duplicate in row " + $cr.getNumber() );
+    }
+}
+
+rule "duplicate in cell col" {
+    when{
+        $c: Cell $c.value !== null {$v: value};
+        $cc: CellCol $c in $cc.cells;
+        $e: Cell $e != $c && $e.value == $v && $e.cellCol == $cc;
+    }
+    then {
+        console.log( "cell " + $c.toString() + " has a duplicate in col " + $cc.getNumber() );
+    }
+}
+
+rule "duplicate in cell sqr" {
+    when{
+        $c: Cell $c.value !== null {$v: value};
+        $cs: CellSqr $c in $cs.cells;
+        $e: Cell $e != $c && $e.value == $v && $e.cellSqr == $cs
+    }
+    then{
+        System.out.println( "cell " + $c.toString() + " has duplicate in its square of nine." );
+    }
+}
diff --git a/examples/sudoku/lib/sudoku.js b/examples/sudoku/lib/sudoku.js
new file mode 100644
index 0000000..bd7a6ab
--- /dev/null
+++ b/examples/sudoku/lib/sudoku.js
@@ -0,0 +1,332 @@
+var declare = require("declare.js"),
+    arr = require("array-extended"),
+    format = require("string-extended").format,
+    unique = arr.unique;
+
+var allNine = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+
+var SetOfNine = declare({
+    instance: {
+
+        free: null,
+        count: 0,
+
+        constructor: function () {
+            this.count = (this.free = allNine.slice()).length;
+        },
+
+        blockValue: function (value) {
+            var index = arr.indexOf(this.free, value);
+            if (index !== -1) {
+                this.free.splice(index, 1);
+                this.count = this.free.length;
+            }
+            return this;
+        },
+
+        blockExcept: function (values) {
+            this.free = values || [];
+            this.count = this.free.length;
+            return this;
+        },
+
+        freeValue: function () {
+            return this.free[0];
+        }
+    }
+}).as(exports, "SetOfNine");
+
+var CellGroup = SetOfNine.extend({
+    instance: {
+        cells: null,
+
+        constructor: function () {
+            this._super(arguments);
+            this.cells = [];
+        },
+
+        addCell: function (cell) {
+            this.cells.push(cell);
+        }
+    }
+}).as(exports, "CellGroup");
+
+
+var CellFile = CellGroup.extend({
+    instance: {
+        number: null,
+
+        constructor: function (number) {
+            this._super(arguments);
+            this.number = number;
+        },
+
+        toString: function () {
+            var ret = [], cells = this.cells;
+            for (var i = 0, l = cells.length; i < l; i++) {
+                ret.push(cells[i].toString());
+            }
+            return ret.join(", ");
+        }
+    }
+}).as(exports, "CellFile");
+
+var Cell = SetOfNine.extend({
+    instance: {
+        value: null,
+        cellRow: null,
+        cellCol: null,
+        CellSqr: null,
+        exCells: null,
+
+        constructor: function () {
+            this._super(arguments);
+            this.exCells = [];
+        },
+
+        makeReferences: function (cr, col, sqr) {
+            this.cellRow = cr;
+            this.cellCol = col;
+            this.cellSqr = sqr;
+            this.colNo = col.number;
+            this.rowNo = cr.number;
+            this.exCells = unique(this.exCells.concat(cr.cells).concat(col.cells).concat(sqr.cells));
+            this.exCells.splice(this.exCells.indexOf(this), 1);
+            return this;
+        },
+
+        toString: function () {
+            return [this.posAsString(), this.valueAsString()].join(": ");
+        },
+
+        valueAsString: function () {
+            return this.value === null ? " " : this.value;
+        },
+
+        posAsString: function () {
+            return ["[", this.cellRow.number, ",", this.cellCol.number, "]"].join("");
+        }
+    }
+}).as(exports, "Cell");
+
+var CellCol = CellFile.extend({
+    instance: {
+        toString: function () {
+            return ["Column ", this.number, ": ", this._super(arguments)];
+        }
+    }
+}).as(exports, "CellCol");
+
+
+var CellRow = CellFile.extend({
+    instance: {
+        toString: function () {
+            return ["Row ", this.number, ": ", this._super(arguments)];
+        }
+    }
+}).as(exports, "CellRow");
+
+var CellSqr = CellGroup.extend({
+    instance: {
+        constructor: function (cr1, cr2, cr3, cc1, cc2, cc3) {
+            this._super(arguments);
+            for (var i = cr1.number; i <= cr3.number; i++) {
+                this.addCell(cc1.cells[i]);
+                this.addCell(cc2.cells[i]);
+                this.addCell(cc3.cells[i]);
+            }
+
+        }
+    }
+}).as(exports, "CellSqr");
+
+var Counter = declare({
+    instance: {
+        count: 0,
+        constructor: function (count) {
+            this.count = count;
+        }
+    }
+}).as(exports, "Counter");
+
+
+var Setting = declare({
+    instance: {
+        rowNo: null,
+        colNo: null,
+        value: null,
+
+        constructor: function (row, col, value) {
+            this.rowNo = row;
+            this.colNo = col;
+            this.value = value;
+        },
+
+        toString: function () {
+            return "Setting [" + this.rowNo + "," + this.colNo + "] : " + this.value;
+        }
+
+    }
+}).as(exports, "Setting");
+
+
+var Stepping = declare({
+    instance: {
+        emergency: false
+    }
+}).as(exports, "Stepping");
+
+var Sudoku = declare({
+    instance: {
+
+        constructor: function (flow) {
+            this.rows = [];
+            this.cols = [];
+            this.sqrs = [];
+            this.cells = [];
+            this.solvedCount = 0;
+            this.flow = flow;
+            this.session = null;
+            this.stepping = null;
+        },
+
+        step: function () {
+            this.session.halt();
+            this.session.modify(this.counter, function () {
+                this.count = 1;
+            });
+            if (!this.stepping) {
+                this.session.assert((this.stepping = new Stepping()));
+            }
+            return this.session.matchUntilHalt(function (err) {
+                if (err) {
+                    console.log("ERROR %s", err.stack);
+                }
+            });
+        },
+
+        solve: function () {
+            var self = this;
+            return this.step().then(function () {
+                self.dumpGrid();
+                if (self.solvedCount !== 81) {
+                    return self.solve();
+                }
+            });
+        },
+
+        create: function () {
+            var rows = this.rows, cols = this.cols, sqrs = this.sqrs, session = this.session;
+            for (var i = 0; i < 9; i++) {
+                session.assert(i + 1);
+                rows[i] = new CellRow(i);
+                cols[i] = new CellCol(i);
+            }
+
+            var cells = this.cells = [], iCol;
+            for (var iRow = 0; iRow < 9; iRow++) {
+                cells[iRow] = [];
+                for (iCol = 0; iCol < 9; iCol++) {
+                    var cell = cells[iRow][iCol] = new Cell();
+                    rows[iRow].addCell(cell);
+                    cols[iCol].addCell(cell);
+                }
+            }
+
+            for (i = 0; i < 3; i++) {
+                sqrs[i] = [];
+                for (var j = 0; j < 3; j++) {
+                    sqrs[i][j] = new CellSqr(rows[i * 3], rows[i * 3 + 1], rows[i * 3 + 2],
+                        cols[j * 3], cols[j * 3 + 1], cols[j * 3 + 2]);
+                }
+            }
+
+            for (iRow = 0; iRow < 9; iRow++) {
+                for (iCol = 0; iCol < 9; iCol++) {
+                    session.assert(cells[iRow][iCol].makeReferences(rows[iRow], cols[iCol], sqrs[Math.floor(iRow / 3)][Math.floor(iCol / 3)]));
+                }
+                session.assert(rows[iRow]);
+                session.assert(cols[iRow]);
+                session.assert(sqrs[Math.floor(iRow / 3)][iRow % 3]);
+            }
+            return this;
+        },
+
+        setCellValues: function (cellValues) {
+            var session = this.session;
+            if (session !== null) {
+                session.dispose();
+            }
+            var self = this;
+            var session = (this.session = this.flow.getSession())
+                .on("set-cell", function () {
+                    self.solvedCount++;
+                });
+
+            var s000 = new Setting(0, 0, 0);
+            this.session.assert(s000);
+            this.create();
+
+            var initial = 0;
+            for (var iRow = 0; iRow < 9; iRow++) {
+                for (var iCol = 0; iCol < 9; iCol++) {
+                    var value = cellValues[iRow][iCol];
+                    if (value) {
+                        session.assert(new Setting(iRow, iCol, value));
+                        initial++;
+                        //console.log(initial);
+                    }
+                }
+            }
+            var counter = this.counter = new Counter(initial);
+            this.session.assert(counter);
+            this.session.retract(s000);
+            return this.session.matchUntilHalt(function (err) {
+                if (err) {
+                    console.log("ERROR %s", err.stack);
+                }
+                this.dumpGrid();
+            }.bind(this));
+        },
+
+        dumpGrid: function () {
+            var cells = this.cells;
+            var print = ["       "];
+            for (var iCol = 0; iCol < 9; iCol++) {
+                print.push(format("Col: %d     ", iCol));
+            }
+            console.log(print.join(""));
+            for (var iRow = 0; iRow < 9; iRow++) {
+                var print = ["Row " + (iRow) + ": "];
+                for (iCol = 0; iCol < 9; iCol++) {
+                    if (cells[iRow][iCol].value !== null) {
+                        print.push(format(" --- %d --- ", cells[iRow][iCol].value));
+                    } else {
+                        var perms = cells[iRow][iCol].free, sb = [];
+                        for (var i = 1; i <= 9; i++) {
+                            if (perms.indexOf(i) !== -1) {
+                                sb.push(i);
+                            } else {
+                                sb.push(' ');
+                            }
+                        }
+                        print.push(format(" %-10s", sb.join("")));
+                    }
+                }
+                console.log(print.join(""));
+            }
+        }
+
+    }
+}).as(exports, "Sudoku");
+
+
+
+
+
+
+
+
+
+
+
diff --git a/history.md b/history.md
index e2244aa..3b2e144 100644
--- a/history.md
+++ b/history.md
@@ -1,3 +1,14 @@
+#0.2.0 / 2013-10-14
+
+* Nools now supports true modify!!!
+   * This is a major leap forward for `nools` opening the door for more complex actions and expressions in the rules.
+* Added support from for `from` conditions in the `rhs`.
+* Fixed issue [#81](https://github.com/C2FO/nools/issues/81).
+* Fixed issue [#82](https://github.com/C2FO/nools/issues/82).
+* Added new `sudoku` web example.
+* Added [Send More Money](http://en.wikipedia.org/wiki/Verbal_arithmetic) benchmark see [#78](https://github.com/C2FO/nools/issues/78).
+
+
 #0.1.14
 * Fixed issue with async actions and early match termination.
 
diff --git a/lib/agenda.js b/lib/agenda.js
index dc97b3c..ac692fd 100644
--- a/lib/agenda.js
+++ b/lib/agenda.js
@@ -1,41 +1,12 @@
 "use strict";
 var extd = require("./extended"),
-    indexOf = extd.indexOf,
+//indexOf = extd.indexOf,
     declare = extd.declare,
     AVLTree = extd.AVLTree,
     LinkedList = extd.LinkedList,
-    EventEmitter = require("events").EventEmitter;
+    EventEmitter = require("events").EventEmitter,
+    sortAgenda = require("./conflict").strategy(["salience", "activationRecency"]);
 
-var sortAgenda = function (a, b) {
-    /*jshint noempty:false*/
-    if (a === b) {
-        return 0;
-    }
-    var ret;
-    var p1 = a.rule.priority, p2 = b.rule.priority;
-    if (p1 !== p2) {
-        ret = p1 - p2;
-    } else if (a.counter !== b.counter) {
-        ret = a.counter - b.counter;
-    }
-    if (!ret) {
-
-        var i = 0;
-        var aMatchRecency = a.match.recency,
-            bMatchRecency = b.match.recency, aLength = aMatchRecency.length - 1, bLength = bMatchRecency.length - 1;
-        while (aMatchRecency[i] === bMatchRecency[i] && i < aLength && i < bLength && i++) {
-        }
-        ret = aMatchRecency[i] - bMatchRecency[i];
-        if (!ret) {
-            ret = aLength - bLength;
-        }
-        //   }
-    }
-    if (!ret) {
-        ret = a.recency - b.recency;
-    }
-    return ret > 0 ? 1 : -1;
-};
 
 var FactHash = declare({
     instance: {
@@ -47,60 +18,33 @@ var FactHash = declare({
         clear: function () {
             this.memoryValues.clear();
             this.memory = {};
-            this.memory.length = this.memoryValues.length = 0;
-        },
-
-        get: function (k) {
-            var node = this.memory[k.id];
-            return node ? node.data : [];
         },
 
 
         remove: function (v) {
-            var facts = v.match.facts,
-                l = facts.length,
-                mv = this.memoryValues,
-                m = this.memory,
-                i = -1,
-                arr, index, node, fId;
-            while (++i < l) {
-                fId = facts[i].id;
-                node = m[fId];
-                arr = node.data;
-                index = indexOf(arr, v);
-                arr.splice(index, 1);
-                if (arr.length === 0) {
-                    mv.remove(node);
-                    delete m[fId];
-                }
+            var hashCode = v.hashCode,
+                memory = this.memory,
+                ret = memory[hashCode];
+            if (ret) {
+                this.memoryValues.remove(ret);
+                delete memory[hashCode];
             }
+            return ret;
         },
 
         insert: function (insert) {
-            var facts = insert.match.facts,
-                mv = this.memoryValues,
-                m = this.memory,
-                l = facts.length,
-                i = -1,
-                node, o, arr, fId;
-            while (++i < l) {
-                o = facts[i];
-                fId = o.id;
-                node = m[o.id];
-                if (!node) {
-                    m[fId] = mv.push((arr = []));
-                } else {
-                    arr = node.data;
-                }
-                arr.push(insert);
+            var hashCode = insert.hashCode;
+            if (hashCode in this.memory) {
+                throw new Error("Activation already in agenda " + insert.rule.name + " agenda");
             }
+            this.memoryValues.push((this.memory[hashCode] = insert));
         }
     }
 
 });
 
 
-var REVERSE_ORDER = AVLTree.REVERSE_ORDER, DEFAULT_AGENDA_GROUP = "main";
+var DEFAULT_AGENDA_GROUP = "main";
 module.exports = declare(EventEmitter, {
 
     instance: {
@@ -194,30 +138,27 @@ module.exports = declare(EventEmitter, {
             return v;
         },
 
-        removeByFact: function (node, fact) {
-            var rule = this.rules[node.name], tree = rule.tree, factTable = rule.factTable;
-            var ma = this.getAgendaGroup(node.rule.agendaGroup);
-            var remove = factTable.get(fact) || [];
-            var i = remove.length, r;
-            while (--i > -1) {
-                r = remove[i];
-                factTable.remove(r);
-                tree.remove(r);
-                ma.remove(r);
+        peek: function () {
+            var tree = this.getFocusedAgenda(), root = tree.__root;
+            while (root.right) {
+                root = root.right;
             }
-            remove.length = 0;
+            return root.data;
         },
 
-        retract: function (node, cb) {
-            var rule = this.rules[node.name], tree = rule.tree, factTable = rule.factTable;
-            var ma = this.getAgendaGroup(node.rule.agendaGroup);
-            tree.traverse(tree.__root, REVERSE_ORDER, function (v) {
-                if (cb(v)) {
-                    factTable.remove(v);
-                    ma.remove(v);
-                    tree.remove(v);
-                }
-            });
+        modify: function (node, context) {
+            this.retract(node, context);
+            this.insert(node, context);
+        },
+
+        retract: function (node, retract) {
+            var rule = this.rules[node.name];
+            retract.rule = node;
+            var activation = rule.factTable.remove(retract);
+            if (activation) {
+                this.getAgendaGroup(node.rule.agendaGroup).remove(activation);
+                rule.tree.remove(activation);
+            }
         },
 
         insert: function (node, insert) {
diff --git a/lib/conflict.js b/lib/conflict.js
new file mode 100644
index 0000000..d5e600c
--- /dev/null
+++ b/lib/conflict.js
@@ -0,0 +1,54 @@
+var map = require("./extended").map;
+
+function salience(a, b) {
+    return a.rule.priority - b.rule.priority;
+}
+
+function bucketCounter(a, b) {
+    return a.counter - b.counter;
+}
+
+function factRecency(a, b) {
+    /*jshint noempty: false*/
+    var i = 0;
+    var aMatchRecency = a.match.recency,
+        bMatchRecency = b.match.recency, aLength = aMatchRecency.length - 1, bLength = bMatchRecency.length - 1;
+    while (aMatchRecency[i] === bMatchRecency[i] && i < aLength && i < bLength && i++) {
+    }
+    var ret = aMatchRecency[i] - bMatchRecency[i];
+    if (!ret) {
+        ret = aLength - bLength;
+    }
+    return ret;
+}
+
+function activationRecency(a, b) {
+    return a.recency - b.recency;
+}
+
+var strategies = {
+    salience: salience,
+    bucketCounter: bucketCounter,
+    factRecency: factRecency,
+    activationRecency: activationRecency
+};
+
+exports.strategies = strategies;
+exports.strategy = function (strats) {
+    strats = map(strats, function (s) {
+        return strategies[s];
+    });
+    var stratsLength = strats.length;
+
+    return function (a, b) {
+        var i = -1, ret = 0;
+        var equal = (a === b) || (a.name === b.name && a.hashCode === b.hashCode);
+        if (!equal) {
+            while (++i < stratsLength && !ret) {
+                ret = strats[i](a, b);
+            }
+            ret = ret > 0 ? 1: -1;
+        }
+        return ret;
+    };
+};
\ No newline at end of file
diff --git a/lib/constraint.js b/lib/constraint.js
index 8f4d2fe..dea1880 100644
--- a/lib/constraint.js
+++ b/lib/constraint.js
@@ -1,12 +1,14 @@
 "use strict";
 
 var extd = require("./extended"),
+    deepEqual = extd.deepEqual,
     merge = extd.merge,
     instanceOf = extd.instanceOf,
     filter = extd.filter,
     declare = extd.declare,
     constraintMatcher;
 
+var id = 0;
 var Constraint = declare({
 
     instance: {
@@ -14,6 +16,7 @@ var Constraint = declare({
             if (!constraintMatcher) {
                 constraintMatcher = require("./constraintMatcher");
             }
+            this.id = id++;
             this.type = type;
             this.constraint = constraint;
         },
@@ -168,5 +171,30 @@ Constraint.extend({
     }
 }).as(exports, "HashConstraint");
 
+Constraint.extend({
+    instance: {
+        constructor: function (prop, constraints) {
+            this.type = "from";
+            this.prop = prop;
+            this.constraints = constraints;
+        },
+
+        equal: function (constraint) {
+            return instanceOf(constraint, this._static) && this.get("alias") === constraint.get("alias") && deepEqual(this.constraints, constraint.constraints);
+        },
+
+        "assert": function () {
+            return true;
+        },
+
+        getters: {
+            variables: function () {
+                return this.constraint;
+            }
+        }
+
+    }
+}).as(exports, "FromConstraint");
+
 
 
diff --git a/lib/context.js b/lib/context.js
index 0ea8b27..246b9db 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -1,5 +1,6 @@
 "use strict";
 var extd = require("./extended"),
+    isBoolean = extd.isBoolean,
     declare = extd.declare,
     merge = extd.merge,
     union = extd.union,
@@ -66,7 +67,19 @@ var Context = declare({
         },
 
         isMatch: function (isMatch) {
-            this.match.isMatch = isMatch;
+            if (isBoolean(isMatch)) {
+                this.match.isMatch = isMatch;
+            } else {
+                return this.match.isMatch;
+            }
+            return this;
+        },
+
+        mergeMatch: function (merge) {
+            var match = this.match = this.match.merge(merge);
+            this.factHash = match.factHash;
+            this.hashCode = match.hashCode;
+            this.factIds = match.factIds;
             return this;
         },
 
diff --git a/lib/extended.js b/lib/extended.js
index 08f132f..2323252 100644
--- a/lib/extended.js
+++ b/lib/extended.js
@@ -1,11 +1,48 @@
+var arr = require("array-extended"),
+    map = arr.map;
+
+function plucked(prop) {
+    var exec = prop.match(/(\w+)\(\)$/);
+    if (exec) {
+        prop = exec[1];
+        return function (item) {
+            return item[prop]();
+        };
+    } else {
+        return function (item) {
+            return item[prop];
+        };
+    }
+}
+
+function plucker(prop) {
+    prop = prop.split(".");
+    if (prop.length === 1) {
+        return plucked(prop[0]);
+    } else {
+        var pluckers = map(prop, function (prop) {
+            return plucked(prop);
+        });
+        var l = pluckers.length;
+        return function (item) {
+            var i = -1, res = item;
+            while (++i < l) {
+                res = pluckers[i](res);
+            }
+            return res;
+        };
+    }
+}
+
 module.exports = require("extended")()
-    .register(require("array-extended"))
+    .register(arr)
     .register(require("date-extended"))
     .register(require("object-extended"))
     .register(require("string-extended"))
     .register(require("promise-extended"))
     .register(require("function-extended"))
     .register(require("is-extended"))
+    .register("plucker", plucker)
     .register("HashTable", require("ht"))
     .register("declare", require("declare.js"))
     .register(require("leafy"))
diff --git a/lib/flow.js b/lib/flow.js
index eaafd8a..a2b0276 100644
--- a/lib/flow.js
+++ b/lib/flow.js
@@ -65,12 +65,11 @@ module.exports = declare(EventEmitter, {
         // retract followed by an assert.
         modify: function (fact, cb) {
             //fact = this.workingMemory.getFact(fact);
-            this.rootNode.retractFact(this.workingMemory.retractFact(fact));
             if ("function" === typeof cb) {
                 cb.call(fact, fact);
             }
+            this.rootNode.modifyFact(this.workingMemory.modifyFact(fact));
             this.emit("modify", fact);
-            this.rootNode.assertFact(this.workingMemory.assertFact(fact));
             return fact;
         },
 
diff --git a/lib/linkedList.js b/lib/linkedList.js
index 0015409..e551e8d 100644
--- a/lib/linkedList.js
+++ b/lib/linkedList.js
@@ -32,7 +32,7 @@ declare({
             } else {
                 this.tail = node.prev;
             }
-            node.data = node.prev = node.next = null;
+            //node.data = node.prev = node.next = null;
             this.length--;
         },
 
diff --git a/lib/nodes/aliasNode.js b/lib/nodes/aliasNode.js
index d221dd1..f65bfe6 100644
--- a/lib/nodes/aliasNode.js
+++ b/lib/nodes/aliasNode.js
@@ -16,8 +16,12 @@ AlphaNode.extend({
             return this.__propagate("assert", context.set(this.alias, context.fact.object));
         },
 
-        retract: function (assertable) {
-            this.propagateRetract(assertable.fact);
+        modify: function (context) {
+            return this.__propagate("modify", context.set(this.alias, context.fact.object));
+        },
+
+        retract: function (context) {
+            return this.__propagate("retract", context.set(this.alias, context.fact.object));
         },
 
         equal: function (other) {
diff --git a/lib/nodes/equalityNode.js b/lib/nodes/equalityNode.js
index 9a09f32..7db5ec1 100644
--- a/lib/nodes/equalityNode.js
+++ b/lib/nodes/equalityNode.js
@@ -1,18 +1,53 @@
 var AlphaNode = require("./alphaNode");
 
+function createContextHash(context) {
+    var ret = [],
+        paths = context.paths,
+        i = -1,
+        l = paths.length;
+    while (++i < l) {
+        ret.push(paths[i].id);
+    }
+    ret.push(context.hashCode);
+    return ret.join(":");
+
+}
+
 AlphaNode.extend({
     instance: {
 
         constructor: function () {
+            this.memory = {};
             this._super(arguments);
         },
 
         assert: function (context) {
-            if (this.constraint.assert(context.factHash)) {
+            var hashCode = createContextHash(context);
+            if ((this.memory[hashCode] = this.constraint.assert(context.factHash))) {
                 this.__propagate("assert", context);
             }
         },
 
+        modify: function (context) {
+            var memory = this.memory,
+                hashCode = createContextHash(context),
+                wasMatch = memory[hashCode];
+            if ((memory[hashCode] = this.constraint.assert(context.factHash))) {
+                this.__propagate(wasMatch ? "modify": "assert", context);
+            } else if (wasMatch) {
+                this.__propagate("retract", context);
+            }
+        },
+
+        retract: function (context) {
+            var hashCode = createContextHash(context),
+                memory = this.memory;
+            if (memory[hashCode]) {
+                this.__propagate("retract", context);
+            }
+            memory[hashCode] = null;
+        },
+
         toString: function () {
             return "EqualityNode" + this.__count;
         }
diff --git a/lib/nodes/fromNode.js b/lib/nodes/fromNode.js
new file mode 100644
index 0000000..7625037
--- /dev/null
+++ b/lib/nodes/fromNode.js
@@ -0,0 +1,218 @@
+var Node = require("./joinNode"),
+    extd = require("../extended"),
+    constraint = require("../constraint"),
+    EqualityConstraint = constraint.EqualityConstraint,
+    HashConstraint = constraint.HashConstraint,
+    ReferenceConstraint = constraint.ReferenceConstraint,
+    Context = require("../context"),
+    plucker = extd.plucker,
+    isEmpty = extd.isEmpty,
+    forEach = extd.forEach,
+    isArray = extd.isArray;
+
+var DEFAULT_MATCH = {
+    isMatch: function () {
+        return false;
+    }
+};
+
+
+Node.extend({
+    instance: {
+
+        constructor: function (pattern, wm) {
+            this._super(arguments);
+            this.workingMemory = wm;
+            this.fromMemory = {};
+            this.pattern = pattern;
+            this.type = pattern.get("constraints")[0];
+            this.alias = pattern.get("alias");
+            this.plucker = plucker(this.from = pattern.from);
+            var eqConstraints = this.__equalityConstraints = [];
+            var vars = [];
+            forEach(this.constraints = this.pattern.get("constraints").slice(1), function (c) {
+                if (c instanceof EqualityConstraint || c instanceof ReferenceConstraint) {
+                    eqConstraints.push(c);
+                } else if (c instanceof HashConstraint) {
+                    vars = vars.concat(c.get("variables"));
+                }
+            });
+            this.__variables = vars;
+        },
+
+        __createMatches: function (context) {
+            var fh = context.factHash, o = this.plucker(fh);
+            if (isArray(o)) {
+                for (var i = 0, l = o.length; i < l; i++) {
+                    this.__checkMatch(context, o[i], true);
+                }
+            } else {
+                this.__checkMatch(context, o, true);
+            }
+        },
+
+        __checkMatch: function (context, o, propogate) {
+            var newContext;
+            if ((newContext = this.__createMatch(context, o)).isMatch() && propogate) {
+                this.__propagate("assert", newContext.clone());
+            }
+            return newContext;
+        },
+
+        __createMatch: function (lc, o) {
+            if (this.type.assert(o)) {
+                var createdFact = this.workingMemory.getFactHandle(o, true),
+                    createdContext,
+                    rc = new Context(createdFact)
+                        .set(this.alias, o),
+                    createdFactId = createdFact.id;
+                var fh = rc.factHash, lcFh = lc.factHash;
+                for (var key in lcFh) {
+                    fh[key] = lcFh[key];
+                }
+                var eqConstraints = this.__equalityConstraints, vars = this.__variables, i = -1, l = eqConstraints.length;
+                while (++i < l) {
+                    if (!eqConstraints[i].assert(fh)) {
+                        createdContext = DEFAULT_MATCH;
+                        break;
+                    }
+                }
+                var fm = this.fromMemory[createdFactId];
+                if (!fm) {
+                    fm = this.fromMemory[createdFactId] = {};
+                }
+                if (!createdContext) {
+                    var prop;
+                    i = -1;
+                    l = vars.length;
+                    while (++i < l) {
+                        prop = vars[i];
+                        fh[prop] = o[prop];
+                    }
+                    lc.fromMatches[createdFact.id] = createdContext = rc.clone(createdFact, null, lc.match.merge(rc.match));
+                }
+                fm[lc.hashCode] = [lc, createdContext];
+                return createdContext;
+            }
+            return DEFAULT_MATCH;
+        },
+
+        retractRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+        removeFromFromMemory: function (context) {
+            var factId = context.fact.id;
+            var fm = this.fromMemory[factId];
+            if (fm) {
+                var entry;
+                for (var i in fm) {
+                    entry = fm[i];
+                    if (entry[1] === context) {
+                        delete fm[i];
+                        if (isEmpty(fm)) {
+                            delete this.fromMemory[factId];
+                        }
+                        break;
+                    }
+                }
+            }
+
+        },
+
+        retractLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                ctx = ctx.data;
+                var fromMatches = ctx.fromMatches;
+                for (var i in fromMatches) {
+                    this.removeFromFromMemory(fromMatches[i]);
+                    this.__propagate("retract", fromMatches[i].clone());
+                }
+            }
+        },
+
+        modifyLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context), newContext, i, l, factId, fact;
+            if (ctx) {
+                this.__addToLeftMemory(context);
+
+                var leftContext = ctx.data,
+                    fromMatches = (context.fromMatches = {}),
+                    rightMatches = leftContext.fromMatches,
+                    o = this.plucker(context.factHash);
+
+                if (isArray(o)) {
+                    for (i = 0, l = o.length; i < l; i++) {
+                        newContext = this.__checkMatch(context, o[i], false);
+                        if (newContext.isMatch()) {
+                            factId = newContext.fact.id;
+                            if (factId in rightMatches) {
+                                this.__propagate("modify", newContext.clone());
+                            } else {
+                                this.__propagate("assert", newContext.clone());
+                            }
+                        }
+                    }
+                } else {
+                    newContext = this.__checkMatch(context, o, false);
+                    if (newContext.isMatch()) {
+                        factId = newContext.fact.id;
+                        if (factId in rightMatches) {
+                            this.__propagate("modify", newContext.clone());
+                        } else {
+                            this.__propagate("assert", newContext.clone());
+                        }
+                    }
+                }
+                for (i in rightMatches) {
+                    if (!(i in fromMatches)) {
+                        this.removeFromFromMemory(rightMatches[i]);
+                        this.__propagate("retract", rightMatches[i].clone());
+                    }
+                }
+            } else {
+                this.assertLeft(context);
+            }
+            fact = context.fact;
+            factId = fact.id;
+            var fm = this.fromMemory[factId];
+            this.fromMemory[factId] = {};
+            if (fm) {
+                var lc, entry, cc, createdIsMatch, factObject = fact.object;
+                for (i in fm) {
+                    entry = fm[i];
+                    lc = entry[0];
+                    cc = entry[1];
+                    createdIsMatch = cc.isMatch();
+                    if (lc.hashCode !== context.hashCode) {
+                        newContext = this.__createMatch(lc, factObject, false);
+                        if (createdIsMatch) {
+                            this.__propagate("retract", cc.clone());
+                        }
+                        if (newContext.isMatch()) {
+                            this.__propagate(createdIsMatch ? "modify": "assert", newContext.clone());
+                        }
+
+                    }
+                }
+            }
+        },
+
+        assertLeft: function (context) {
+            this.__addToLeftMemory(context);
+            context.fromMatches = {};
+            this.__createMatches(context);
+        },
+
+        assertRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+
+        toString: function () {
+            return "FromNode" + this.__count;
+        }
+
+    }
+}).as(module);
\ No newline at end of file
diff --git a/lib/nodes/fromNotNode.js b/lib/nodes/fromNotNode.js
new file mode 100644
index 0000000..c1636f1
--- /dev/null
+++ b/lib/nodes/fromNotNode.js
@@ -0,0 +1,165 @@
+var Node = require("./joinNode"),
+    extd = require("../extended"),
+    constraint = require("../constraint"),
+    EqualityConstraint = constraint.EqualityConstraint,
+    HashConstraint = constraint.HashConstraint,
+    ReferenceConstraint = constraint.ReferenceConstraint,
+    Context = require("../context"),
+    plucker = extd.plucker,
+    forEach = extd.forEach,
+    isArray = extd.isArray;
+
+Node.extend({
+    instance: {
+
+        constructor: function (pattern, workingMemory) {
+            this._super(arguments);
+            this.workingMemory = workingMemory;
+            this.pattern = pattern;
+            this.type = pattern.get("constraints")[0];
+            this.alias = pattern.get("alias");
+            this.plucker = plucker(this.from = pattern.from);
+            this.fromMemory = {};
+            var eqConstraints = this.__equalityConstraints = [];
+            var vars = [];
+            forEach(this.constraints = this.pattern.get("constraints").slice(1), function (c) {
+                if (c instanceof EqualityConstraint || c instanceof ReferenceConstraint) {
+                    eqConstraints.push(c);
+                } else if (c instanceof HashConstraint) {
+                    vars = vars.concat(c.get("variables"));
+                }
+            });
+            this.__variables = vars;
+
+        },
+
+        retractLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                ctx = ctx.data;
+                if (!ctx.blocked) {
+                    this.__propagate("retract", ctx.clone());
+                }
+            }
+        },
+
+        __modify: function (context, leftContext) {
+            var leftContextBlocked = leftContext.blocked;
+            var fh = context.factHash, o = this.plucker(fh);
+            if (isArray(o)) {
+                for (var i = 0, l = o.length; i < l; i++) {
+                    if (this.__isMatch(context, o[i], true)) {
+                        context.blocked = true;
+                        break;
+                    }
+                }
+            } else {
+                context.blocked = this.__isMatch(context, o, true);
+            }
+            var newContextBlocked = context.blocked;
+            if (!newContextBlocked) {
+                if (leftContextBlocked) {
+                    this.__propagate("assert", context.clone());
+                } else {
+                    this.__propagate("modify", context.clone());
+                }
+            } else if (!leftContextBlocked) {
+                this.__propagate("retract", leftContext.clone());
+            }
+
+        },
+
+        modifyLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                this.__addToLeftMemory(context);
+                this.__modify(context, ctx.data);
+            } else {
+                throw new Error();
+            }
+            var fm = this.fromMemory[context.fact.id];
+            this.fromMemory[context.fact.id] = {};
+            if (fm) {
+                for (var i in fm) {
+                    // update any contexts associated with this fact
+                    if (i !== context.hashCode) {
+                        var lc = fm[i];
+                        ctx = this.removeFromLeftMemory(lc);
+                        if (ctx) {
+                            lc = lc.clone();
+                            lc.blocked = false;
+                            this.__addToLeftMemory(lc);
+                            this.__modify(lc, ctx.data);
+                        }
+                    }
+                }
+            }
+        },
+
+        __findMatches: function (context) {
+            var fh = context.factHash, o = this.plucker(fh), isMatch = false;
+            if (isArray(o)) {
+                for (var i = 0, l = o.length; i < l; i++) {
+                    if (this.__isMatch(context, o[i], true)) {
+                        context.blocked = true;
+                        return;
+                    }
+                }
+                this.__propagate("assert", context.clone());
+            } else if (!(context.blocked = this.__isMatch(context, o, true))) {
+                this.__propagate("assert", context.clone());
+            }
+            return isMatch;
+        },
+
+        __isMatch: function (oc, o, add) {
+            var ret = false;
+            if (this.type.assert(o)) {
+                var createdFact = this.workingMemory.getFactHandle(o);
+                var context = new Context(createdFact, null)
+                    .mergeMatch(oc.match)
+                    .set(this.alias, o);
+                if (add) {
+                    var fm = this.fromMemory[createdFact.id];
+                    if (!fm) {
+                        fm = this.fromMemory[createdFact.id] = {};
+                    }
+                    fm[oc.hashCode] = oc;
+                }
+                var fh = context.factHash;
+                var eqConstraints = this.__equalityConstraints;
+                for (var i = 0, l = eqConstraints.length; i < l; i++) {
+                    if (eqConstraints[i].assert(fh)) {
+                        ret = true;
+                    } else {
+                        ret = false;
+                        break;
+                    }
+                }
+            }
+            return ret;
+        },
+
+        removeFromLeftMemory: function () {
+            return this._super(arguments);
+        },
+
+        assertLeft: function (context) {
+            this.__addToLeftMemory(context);
+            this.__findMatches(context);
+        },
+
+        assertRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+        retractRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+        toString: function () {
+            return "FromNode" + this.__count;
+        }
+
+    }
+}).as(module);
\ No newline at end of file
diff --git a/lib/nodes/index.js b/lib/nodes/index.js
index 49ef321..27b7923 100644
--- a/lib/nodes/index.js
+++ b/lib/nodes/index.js
@@ -5,6 +5,8 @@ var extd = require("../extended"),
     declare = extd.declare,
     pattern = require("../pattern.js"),
     ObjectPattern = pattern.ObjectPattern,
+    FromPattern = pattern.FromPattern,
+    FromNotPattern = pattern.FromNotPattern,
     NotPattern = pattern.NotPattern,
     CompositePattern = pattern.CompositePattern,
     InitialFactPattern = pattern.InitialFactPattern,
@@ -15,6 +17,8 @@ var extd = require("../extended"),
     EqualityNode = require("./equalityNode"),
     JoinNode = require("./joinNode"),
     NotNode = require("./notNode"),
+    FromNode = require("./fromNode"),
+    FromNotNode = require("./fromNotNode"),
     LeftAdapterNode = require("./leftAdapterNode"),
     RightAdapterNode = require("./rightAdapterNode"),
     TypeNode = require("./typeNode"),
@@ -35,6 +39,7 @@ declare({
                 recency: 0
             };
             this.agendaTree = agendaTree;
+            this.workingMemory = wm;
         },
 
         assertRule: function (rule) {
@@ -66,6 +71,13 @@ declare({
             }
         },
 
+        modifyFact: function (fact) {
+            var typeNodes = this.typeNodes, i = typeNodes.length - 1;
+            for (; i >= 0; i--) {
+                typeNodes[i].modify(fact);
+            }
+        },
+
 
         containsRule: function (name) {
             return some(this.terminalNodes, function (n) {
@@ -129,17 +141,22 @@ declare({
         },
 
         __createAdapterNode: function (rule, side) {
-            return (side === "left" ? new LeftAdapterNode() : new RightAdapterNode()).addRule(rule);
+            return (side === "left" ? new LeftAdapterNode(): new RightAdapterNode()).addRule(rule);
         },
 
         __createJoinNode: function (rule, pattern, outNode, side) {
             var joinNode;
             if (pattern.rightPattern instanceof NotPattern) {
                 joinNode = new NotNode();
+            } else if (pattern.rightPattern instanceof FromNotPattern) {
+                joinNode = new FromNotNode(pattern.rightPattern, this.workingMemory);
+            } else if (pattern.rightPattern instanceof FromPattern) {
+                joinNode = new FromNode(pattern.rightPattern, this.workingMemory);
             } else {
                 joinNode = new JoinNode();
                 this.joinNodes.push(joinNode);
             }
+            joinNode["__rule__"] = rule;
             var parentNode = joinNode;
             if (outNode instanceof JoinNode) {
                 var adapterNode = this.__createAdapterNode(rule, side);
@@ -152,10 +169,15 @@ declare({
 
         __addToNetwork: function (rule, pattern, outNode, side) {
             if (pattern instanceof ObjectPattern) {
-                if (pattern instanceof NotPattern && (!side || side === "left")) {
-                    return this.__createBetaNode(rule, new CompositePattern(new InitialFactPattern(), pattern), outNode, side);
+                if ((pattern instanceof NotPattern || pattern instanceof FromPattern || pattern instanceof FromNotPattern) && (!side || side === "left")) {
+                    if (pattern instanceof FromNotPattern) {
+                        this.__createBetaNode(rule, new CompositePattern(new InitialFactPattern(), pattern), outNode, side);
+                    } else {
+                        this.__createBetaNode(rule, new CompositePattern(new InitialFactPattern(), pattern), outNode, side);
+                    }
+                } else {
+                    this.__createAlphaNode(rule, pattern, outNode, side);
                 }
-                this.__createAlphaNode(rule, pattern, outNode, side);
             } else if (pattern instanceof CompositePattern) {
                 this.__createBetaNode(rule, pattern, outNode, side);
             }
@@ -171,36 +193,41 @@ declare({
 
 
         __createAlphaNode: function (rule, pattern, outNode, side) {
-            var constraints = pattern.get("constraints");
-            var typeNode = this.__createTypeNode(rule, pattern);
-            var aliasNode = this.__createAliasNode(rule, pattern);
-            typeNode.addOutNode(aliasNode, pattern);
-            aliasNode.addParentNode(typeNode);
-            var parentNode = aliasNode;
-            var i = constraints.length - 1;
-            for (; i > 0; i--) {
-                var constraint = constraints[i], node;
-                if (constraint instanceof HashConstraint) {
-                    node = this.__createPropertyNode(rule, constraint);
-                } else if (constraint instanceof ReferenceConstraint) {
-                    outNode.constraint.addConstraint(constraint);
-                    continue;
-                } else {
-                    node = this.__createEqualityNode(rule, constraint);
+            var typeNode, parentNode;
+            if (!(pattern instanceof FromPattern)) {
+
+                var constraints = pattern.get("constraints");
+                typeNode = this.__createTypeNode(rule, pattern);
+                var aliasNode = this.__createAliasNode(rule, pattern);
+                typeNode.addOutNode(aliasNode, pattern);
+                aliasNode.addParentNode(typeNode);
+                parentNode = aliasNode;
+                var i = constraints.length - 1;
+                for (; i > 0; i--) {
+                    var constraint = constraints[i], node;
+                    if (constraint instanceof HashConstraint) {
+                        node = this.__createPropertyNode(rule, constraint);
+                    } else if (constraint instanceof ReferenceConstraint) {
+                        outNode.constraint.addConstraint(constraint);
+                        continue;
+                    } else {
+                        node = this.__createEqualityNode(rule, constraint);
+                    }
+                    parentNode.addOutNode(node, pattern);
+                    node.addParentNode(parentNode);
+                    parentNode = node;
                 }
-                parentNode.addOutNode(node, pattern);
-                node.addParentNode(parentNode);
-                parentNode = node;
-            }
-            if (outNode instanceof JoinNode) {
-                var adapterNode = this.__createAdapterNode(rule, side);
-                adapterNode.addParentNode(parentNode);
-                parentNode.addOutNode(adapterNode, pattern);
-                parentNode = adapterNode;
+
+                if (outNode instanceof JoinNode) {
+                    var adapterNode = this.__createAdapterNode(rule, side);
+                    adapterNode.addParentNode(parentNode);
+                    parentNode.addOutNode(adapterNode, pattern);
+                    parentNode = adapterNode;
+                }
+                outNode.addParentNode(parentNode);
+                parentNode.addOutNode(outNode, pattern);
+                return typeNode;
             }
-            outNode.addParentNode(parentNode);
-            parentNode.addOutNode(outNode, pattern);
-            return typeNode;
         },
 
         print: function () {
diff --git a/lib/nodes/joinNode.js b/lib/nodes/joinNode.js
index 9e80431..f6766b9 100644
--- a/lib/nodes/joinNode.js
+++ b/lib/nodes/joinNode.js
@@ -1,8 +1,8 @@
 var extd = require("../extended"),
     values = extd.hash.values,
-    indexOf = extd.indexOf,
     Node = require("./node"),
-    JoinReferenceNode = require("./joinReferenceNode");
+    JoinReferenceNode = require("./joinReferenceNode"),
+    LinkedList = require("../linkedList");
 
 Node.extend({
 
@@ -12,22 +12,26 @@ Node.extend({
             this.constraint = new JoinReferenceNode();
             this.leftMemory = {};
             this.rightMemory = {};
-            this.leftTuples = [];
-            this.rightTuples = [];
+            this.leftTuples = new LinkedList();
+            this.rightTuples = new LinkedList();
         },
 
         dispose: function () {
             this.leftMemory = {};
             this.rightMemory = {};
+            this.leftTuples.clear();
+            this.rightTuples.clear();
         },
 
         disposeLeft: function (fact) {
             this.leftMemory = {};
+            this.leftTuples.clear();
             this.propagateDispose(fact);
         },
 
         disposeRight: function (fact) {
             this.rightMemory = {};
+            this.rightTuples.clear();
             this.propagateDispose(fact);
         },
 
@@ -39,100 +43,245 @@ Node.extend({
             return "JoinNode " + this.__count;
         },
 
-        retractResolve: function (match) {
-            var es = values(this.leftMemory), j = es.length, leftTuples = this.leftTuples;
-            while (--j > -1) {
-                var contexts = es[j], i = contexts.length, context;
-                while (--i > -1) {
-                    context = contexts[i];
-                    if (this.resolve(context.match, match)) {
-                        leftTuples.splice(indexOf(leftTuples, context), 1);
-                        contexts.splice(i, 1);
-                        break;
-                    }
+        retractLeft: function (context) {
+            context = this.removeFromLeftMemory(context);
+            if (context) {
+                context = context.data;
+                var rightMathces = values(context.rightMatches),
+                    i = -1,
+                    l = rightMathces.length;
+                while (++i < l) {
+                    this.__propagate("retract", rightMathces[i]);
                 }
+            }else{
+                throw new Error();
             }
-            this._propagateRetractResolve(match);
+            return this;
         },
 
-        retractLeft: function (fact) {
-            var contexts = this.leftMemory[fact.id], tuples = this.leftTuples, i, l;
-            if (contexts) {
-                i = -1;
-                l = contexts.length;
+        retractRight: function (context) {
+            context = this.removeFromRightMemory(context);
+            if (context) {
+                context = context.data;
+                var leftMatches = values(context.leftMatches),
+                    i = -1,
+                    l = leftMatches.length;
                 while (++i < l) {
-                    tuples.splice(indexOf(tuples, contexts[i]), 1);
+                    this.__propagate("retract", leftMatches[i]);
+                }
+            }else{
+                throw new Error();
+            }
+            return this;
+        },
+
+        propagateFromLeft: function (context, constraint, rm) {
+            var mr;
+            if ((mr = constraint.setRightContext(rm).match()).isMatch) {
+                this.__propagate("assert", this.__addToMemoryMatches(rm, context, context.clone(null, null, mr)));
+            }
+            return this;
+        },
+
+        propagateFromRight: function (context, constraint, lm) {
+            var mr;
+            if ((mr = constraint.setLeftContext(lm).match()).isMatch) {
+                this.__propagate("assert", this.__addToMemoryMatches(context, lm, context.clone(null, null, mr)));
+            }
+            return this;
+        },
+
+        assertLeft: function (context) {
+            if (this.__addToLeftMemory(context)) {
+                var rm = this.rightTuples, node = {next: rm.head}, thisConstraint = this.constraint;
+                if (rm.length) {
+                    thisConstraint.setLeftContext(context);
+                    while ((node = node.next)) {
+                        this.propagateFromLeft(context, thisConstraint, node.data);
+                    }
+                    thisConstraint.clearContexts();
                 }
-                delete this.leftMemory[fact.id];
             } else {
-                var tuple;
-                for (i = 0; i < tuples.length; i++) {
-                    tuple = tuples[i];
-                    if (indexOf(tuple.factIds, fact.id) !== -1) {
-                        tuples.splice(i, 1);
+                this.modifyLeft(context);
+            }
+        },
+
+        assertRight: function (context) {
+            if (this.__addToRightMemory(context)) {
+                var lm = this.leftTuples;
+                if (lm.length) {
+                    var node = {next: lm.head}, thisConstraint = this.constraint;
+                    thisConstraint.setRightContext(context);
+                    while ((node = node.next)) {
+                        this.propagateFromRight(context, thisConstraint, node.data);
                     }
+                    thisConstraint.clearContexts();
                 }
+            } else {
+                this.modifyRight(context);
             }
-            this.propagateRetract(fact);
         },
 
-        retractRight: function (fact) {
-            var context = this.rightMemory[fact.id], tuples = this.rightTuples;
-            if (context) {
-                tuples.splice(indexOf(tuples, context), 1);
-                delete this.rightMemory[fact.id];
+        modifyLeft: function (context) {
+            var previousContext;
+            if ((previousContext = this.removeFromLeftMemory(context))) {
+                previousContext = previousContext.data;
+                this.__addToLeftMemory(context);
+                var rm = this.rightTuples, l = rm.length;
+                if (!l) {
+                    this.propagateRetract(context);
+                } else {
+                    var thisConstraint = this.constraint,
+                        node = {next: rm.head},
+                        rightMatches = previousContext.rightMatches;
+                    thisConstraint.setLeftContext(context);
+                    while ((node = node.next)) {
+                        this.propagateAssertModifyFromLeft(context, rightMatches, thisConstraint, node.data);
+                    }
+                    thisConstraint.clearContexts();
+
+                }
             } else {
-                var tuple;
-                for (var i = 0; i < tuples.length; i++) {
-                    tuple = tuples[i];
-                    if (indexOf(tuple.factIds, fact.id) !== -1) {
-                        tuples.splice(i, 1);
+                throw new Error();
+            }
+
+        },
+
+        modifyRight: function (context) {
+            var previousContext;
+            if ((previousContext = this.removeFromRightMemory(context))) {
+                previousContext = previousContext.data;
+                this.__addToRightMemory(context);
+                var lm = this.leftTuples;
+                if (!lm.length) {
+                    this.propagateRetract(context);
+                } else {
+                    var thisConstraint = this.constraint,
+                        leftMatches = previousContext.leftMatches,
+                        node = {next: lm.head};
+                    thisConstraint.setRightContext(context);
+                    while ((node = node.next)) {
+                        this.propagateAssertModifyFromRight(context, leftMatches, thisConstraint, node.data);
                     }
+                    thisConstraint.clearContexts();
                 }
+            }  else {
+                throw new Error();
             }
-            this.propagateRetract(fact);
+
         },
 
-        assertLeft: function (context) {
-            this.__addToLeftMemory(context);
-            var rm = this.rightTuples, i = -1, l = rm.length, thisConstraint = this.constraint, mr;
-            thisConstraint.setLeftContext(context);
-            while (++i < l) {
-                if ((mr = thisConstraint.setRightContext(rm[i]).match()).isMatch) {
-                    this.__propagate("assert", context.clone(null, null, mr));
+        propagateAssertModifyFromLeft: function (context, rightMatches, constraint, rm) {
+            var factId = rm.hashCode, mr;
+            if (factId in rightMatches) {
+                mr = constraint.setRightContext(rm).match();
+                var mrIsMatch = mr.isMatch;
+                if (!mrIsMatch) {
+                    this.__propagate("retract", rightMatches[factId].clone());
+                } else {
+                    this.__propagate("modify", this.__addToMemoryMatches(rm, context, context.clone(null, null, mr)));
                 }
+            } else {
+                this.propagateFromLeft(context, constraint, rm);
             }
-            thisConstraint.clearContexts();
         },
 
-        assertRight: function (context) {
-            var fact = context.fact;
-            this.rightMemory[fact.id] = context;
-            this.rightTuples.push(context);
-            var fl = this.leftTuples, i = -1, l = fl.length, thisConstraint = this.constraint, mr;
-            thisConstraint.setRightContext(context);
-            while (++i < l) {
-                if ((mr = thisConstraint.setLeftContext(fl[i]).match()).isMatch) {
-                    this.__propagate("assert", context.clone(null, null, mr));
+        propagateAssertModifyFromRight: function (context, leftMatches, constraint, lm) {
+            var factId = lm.hashCode, mr;
+            if (factId in leftMatches) {
+                mr = constraint.setLeftContext(lm).match();
+                var mrIsMatch = mr.isMatch;
+                if (!mrIsMatch) {
+                    this.__propagate("retract", leftMatches[factId].clone());
+                } else {
+                    this.__propagate("modify", this.__addToMemoryMatches(context, lm, context.clone(null, null, mr)));
+                }
+            } else {
+                this.propagateFromRight(context, constraint, lm);
+            }
+        },
+
+        removeFromRightMemory: function (context) {
+            var hashCode = context.hashCode, ret;
+            context = this.rightMemory[hashCode] || null;
+            var tuples = this.rightTuples;
+            if (context) {
+                var leftMemory = this.leftMemory;
+                ret = context.data;
+                var leftMatches = ret.leftMatches;
+                tuples.remove(context);
+                for (var i in leftMatches) {
+                    delete leftMemory[i].data.rightMatches[hashCode];
+                }
+                delete this.rightMemory[hashCode];
+            }
+            return context;
+        },
+
+        removeFromLeftMemory: function (context) {
+            var hashCode = context.hashCode;
+            context = this.leftMemory[hashCode] || null;
+            if (context) {
+                var rightMemory = this.rightMemory;
+                var rightMatches = context.data.rightMatches;
+                this.leftTuples.remove(context);
+                for (var i in rightMatches) {
+                    delete rightMemory[i].data.leftMatches[hashCode];
                 }
+                delete this.leftMemory[hashCode];
             }
-            thisConstraint.clearContexts();
+            return context;
         },
 
-        _propagateRetractResolve: function (context) {
-            this.__propagate("retractResolve", context);
+        getRightMemoryMatches: function (context) {
+            var lm = this.leftMemory[context.hashCode], ret = {};
+            if (lm) {
+                ret = lm.rightMatches;
+            }
+            return ret;
         },
 
+        __addToMemoryMatches: function (rightContext, leftContext, createdContext) {
+            var rightFactId = rightContext.hashCode,
+                rm = this.rightMemory[rightFactId],
+                lm, leftFactId = leftContext.hashCode;
+            if (rm) {
+                rm = rm.data;
+                if (leftFactId in rm.leftMatches) {
+                    throw new Error("Duplicate left fact entry");
+                }
+                rm.leftMatches[leftFactId] = createdContext;
+            }
+            lm = this.leftMemory[leftFactId];
+            if (lm) {
+                lm = lm.data;
+                if (rightFactId in lm.rightMatches) {
+                    throw new Error("Duplicate right fact entry");
+                }
+                lm.rightMatches[rightFactId] = createdContext;
+            }
+            return createdContext;
+        },
+
+        __addToRightMemory: function (context) {
+            var hashCode = context.hashCode, rm = this.rightMemory;
+            if (hashCode in rm) {
+                return false;
+            }
+            rm[hashCode] = this.rightTuples.push(context);
+            context.leftMatches = {};
+            return true;
+        },
+
+
         __addToLeftMemory: function (context) {
-            var o = context.fact;
-            var lm = this.leftMemory[o.id];
-            if (!lm) {
-                lm = [];
-                this.leftMemory[o.id] = lm;
-            }
-            this.leftTuples.push(context);
-            lm.push(context);
-            return this;
+            var hashCode = context.hashCode, lm = this.leftMemory;
+            if (hashCode in lm) {
+                return false;
+            }
+            lm[hashCode] = this.leftTuples.push(context);
+            context.rightMatches = {};
+            return true;
         }
     }
 
diff --git a/lib/nodes/joinReferenceNode.js b/lib/nodes/joinReferenceNode.js
index 56d90b9..e77960f 100644
--- a/lib/nodes/joinReferenceNode.js
+++ b/lib/nodes/joinReferenceNode.js
@@ -1,9 +1,16 @@
 var Node = require("./node");
+
+var DEFUALT_CONSTRAINT = {
+    assert: function () {
+        return true;
+    }
+};
+
 Node.extend({
 
     instance: {
 
-        constraint: null,
+        constraint: DEFUALT_CONSTRAINT,
         __lc: null,
         __rc: null,
         __varLength: 0,
@@ -51,12 +58,12 @@ Node.extend({
         clearLeftContext: function () {
             this.__lc = null;
             var fh = this.__fh = {}, rc = this.__rc;
-            fh[this.__alias] = rc ? rc.fact.object : null;
+            fh[this.__alias] = rc ? rc.fact.object: null;
             return this;
         },
 
         addConstraint: function (constraint) {
-            if (this.constraint === null) {
+            if (this.constraint === DEFUALT_CONSTRAINT) {
                 this.constraint = constraint;
             } else {
                 this.constraint = this.constraint.merge(constraint);
@@ -66,17 +73,13 @@ Node.extend({
         },
 
         equal: function (constraint) {
-            if (this.constraint !== null) {
+            if (this.constraint !== DEFUALT_CONSTRAINT) {
                 return this.constraint.equal(constraint.constraint);
             }
         },
 
         isMatch: function () {
-            var constraint = this.constraint, ret = true;
-            if (constraint !== null) {
-                ret = constraint.assert(this.__fh);
-            }
-            return ret;
+            return this.constraint.assert(this.__fh);
         },
 
         match: function () {
diff --git a/lib/nodes/leftAdapterNode.js b/lib/nodes/leftAdapterNode.js
index e96d9a1..3f96a6d 100644
--- a/lib/nodes/leftAdapterNode.js
+++ b/lib/nodes/leftAdapterNode.js
@@ -14,7 +14,7 @@ Node.extend({
             this.__propagate("retractResolve", context);
         },
 
-        modify: function (context) {
+        propagateModify: function (context) {
             this.__propagate("modifyLeft", context);
         },
 
diff --git a/lib/nodes/node.js b/lib/nodes/node.js
index 6302942..4039847 100644
--- a/lib/nodes/node.js
+++ b/lib/nodes/node.js
@@ -70,8 +70,7 @@ declare({
             return false;
         },
 
-        __propagate: function (method, context, outNodes) {
-            outNodes = outNodes || this.nodes;
+        __propagate: function (method, context) {
             var entrySet = this.__entrySet, i = entrySet.length, entry, outNode, paths, continuingPaths;
             while (--i > -1) {
                 entry = entrySet[i];
@@ -104,20 +103,24 @@ declare({
             }
         },
 
-        propagateAssert: function (assertable, outNodes) {
-            this.__propagate("assert", assertable, outNodes || this.nodes);
+        propagateAssert: function (assertable) {
+            this.__propagate("assert", assertable);
         },
 
-        propagateRetract: function (assertable, outNodes) {
-            this.__propagate("retract", assertable, outNodes || this.nodes);
+        propagateRetract: function (assertable) {
+            this.__propagate("retract", assertable);
         },
 
         assert: function (assertable) {
             this.propagateAssert(assertable);
         },
 
-        propagateModify: function (assertable, outNodes) {
-            this.__propagate("modify", assertable, outNodes || this.nodes);
+        modify: function (assertable) {
+            this.propagateModify(assertable);
+        },
+
+        propagateModify: function (assertable) {
+            this.__propagate("modify", assertable);
         }
     }
 
diff --git a/lib/nodes/notNode.js b/lib/nodes/notNode.js
index ac3d94d..85b3826 100644
--- a/lib/nodes/notNode.js
+++ b/lib/nodes/notNode.js
@@ -1,7 +1,5 @@
 var JoinNode = require("./joinNode"),
-    Context = require("../context"),
-    extd = require("../extended"),
-    indexOf = extd.indexOf;
+    LinkedList = require("../linkedList");
 
 JoinNode.extend({
     instance: {
@@ -9,7 +7,6 @@ JoinNode.extend({
         constructor: function () {
             this._super(arguments);
             this.leftTupleMemory = {};
-            this.allTuples = {};
         },
 
 
@@ -18,167 +15,257 @@ JoinNode.extend({
         },
 
 
-        retractRight: function (fact) {
-            var rightMemory = this.rightMemory;
-            var rightContext = rightMemory[fact.id], thisConstraint = this.constraint;
-            delete rightMemory[fact.id];
-            if (rightContext) {
-                var index = indexOf(this.rightTuples, rightContext);
-                this.rightTuples.splice(index, 1);
-                var fl = rightContext.blocking, leftContext;
-                var rValues = this.rightTuples, k = rValues.length, rc, j;
-                while ((leftContext = fl.pop())) {
-                    leftContext.blocker = null;
-                    thisConstraint.setLeftContext(leftContext);
-                    for (j = index; j < k; j++) {
-                        rc = rValues[j];
-                        thisConstraint.setRightContext(rc);
-                        if (thisConstraint.isMatch()) {
-                            leftContext.blocker = rc;
-                            rc.blocking.push(leftContext);
-                            this.__addToLeftTupleMemory(leftContext);
-                            break;
+        retractRight: function (context) {
+            var ctx = this.removeFromRightMemory(context);
+            if (ctx) {
+                var rightContext = ctx.data;
+                var blocking = rightContext.blocking;
+                if (blocking.length) {
+                    //if we are blocking left contexts
+                    var leftContext, rightTuples = this.rightTuples, thisConstraint = this.constraint, blockingNode = {next: blocking.head}, node, l = rightTuples.length, rc;
+                    while ((blockingNode = blockingNode.next)) {
+                        leftContext = blockingNode.data;
+                        this.removeFromLeftBlockedMemory(leftContext);
+                        if (l !== 0) {
+                            thisConstraint.setLeftContext(leftContext);
+                            node = ctx;
+                            while ((node = node.next)) {
+                                if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
+                                    leftContext.blocker = rc;
+                                    this.addToLeftBlockedMemory(rc.blocking.push(leftContext));
+                                    leftContext = null;
+                                    break;
+                                }
+                            }
+                            thisConstraint.clearContexts();
+                        }
+                        if (leftContext) {
+                            this.__addToLeftMemory(leftContext);
+                            this.__propagate("assert", leftContext.clone());
                         }
                     }
-                    if (!leftContext.blocker) {
-                        this.__removeFromLeftTupleMemory(leftContext);
-                        this.__addToLeftMemory(leftContext).propagateAssert(new Context(leftContext.fact, null, leftContext.match));
-                    }
+                    blocking.clear();
                 }
-                thisConstraint.clearContexts();
+            } else {
+                throw new Error();
             }
+
         },
 
 
-        retractLeft: function (fact) {
-            var factId = fact.id, tuples = this.allTuples[fact.id] || [], context, blocking, blocker;
-            while (tuples.length) {
-                context = tuples.pop();
-                if (indexOf(context.factIds, factId) !== -1) {
-                    this.__removeFromAllTupleMemory(context);
-                    this.__removeFromLeftMemory(context);
-                    this.__removeFromLeftTupleMemory(context);
-                    if ((blocker = context.blocker)) {
-                        blocking = blocker.blocking;
-                        blocking.splice(indexOf(blocking, context), 1);
-                        context.blocker = null;
-                    }
+        retractLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                this.__propagate("retract", ctx.data.clone());
+            } else {
+                if (!this.removeFromLeftBlockedMemory(context)) {
+                    throw new Error();
                 }
             }
-            delete this.leftMemory[factId];
-            delete this.leftTupleMemory[factId];
-            this.propagateRetract(fact);
-
         },
 
         assertLeft: function (context) {
-            var values = this.rightTuples, thisConstraint = this.constraint, i = -1, l = values.length, rc;
-            if (l !== 0) {
+            var values = this.rightTuples,
+                node,
+                thisConstraint = this.constraint, rc;
+            if (values.length) {
+                node = {next: values.head};
                 thisConstraint.setLeftContext(context);
-                while (++i < l) {
-                    if (thisConstraint.setRightContext(rc = values[i]).isMatch()) {
+                while ((node = node.next) && context) {
+                    if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
                         context.blocker = rc;
-                        rc.blocking.push(context);
-                        this.__addToLeftTupleMemory(context);
+                        this.addToLeftBlockedMemory(rc.blocking.push(context));
                         context = null;
-                        break;
                     }
                 }
+                thisConstraint.clearContexts();
             }
             if (context) {
-                this.__addToLeftMemory(context).propagateAssert(new Context(context.fact, null, context.match));
+                this.__addToLeftMemory(context);
+                this.__propagate("assert", context.clone());
             }
         },
 
         assertRight: function (context) {
-            context.blocking = [];
-            this.rightTuples.push(context);
-            this.rightMemory[context.fact.id] = context;
-            var fl = this.leftTuples, i = fl.length, leftContext, thisConstraint = this.constraint;
-            thisConstraint.setRightContext(context);
-            while (--i > -1) {
-                leftContext = fl[i];
-                if (thisConstraint.setLeftContext(leftContext).isMatch()) {
-                    this._propagateRetractResolve(leftContext.match);
-                    //blocked so remove from memory
-                    this.__removeFromLeftMemory(leftContext);
-                    leftContext.blocker = context;
-                    context.blocking.push(leftContext);
-                    this.__addToLeftTupleMemory(leftContext);
+            this.__addToRightMemory(context);
+            context.blocking = new LinkedList();
+            var fl = this.leftTuples, leftContext, node, thisConstraint = this.constraint;
+            if (fl.length) {
+                node = {next: fl.head};
+                thisConstraint.setRightContext(context);
+                while ((node = node.next)) {
+                    leftContext = node.data;
+                    if (thisConstraint.setLeftContext(leftContext).isMatch()) {
+                        this.__propagate("retract", leftContext.clone());
+                        this.removeFromLeftMemory(leftContext);
+                        leftContext.blocker = context;
+                        this.addToLeftBlockedMemory(context.blocking.push(leftContext));
+                    }
                 }
+                thisConstraint.clearContexts();
             }
-            thisConstraint.clearContexts();
         },
 
-        __removeFromLeftMemory: function (context) {
-            var leftMemories = this.leftMemory[context.fact.id] || [], lc, tuples = this.leftTuples;
-            for (var i = 0, l = tuples.length; i < l; i++) {
-                lc = tuples[i];
-                if (lc === context) {
-                    tuples.splice(i, 1);
-                    leftMemories.splice(indexOf(leftMemories, lc), 1);
-                    break;
-                }
+        addToLeftBlockedMemory: function (context) {
+            var data = context.data, hashCode = data.hashCode;
+            var ctx = this.leftMemory[hashCode];
+            this.leftTupleMemory[hashCode] = context;
+            if (ctx) {
+                this.leftTuples.remove(ctx);
             }
             return this;
         },
 
-        __removeFromLeftTupleMemory: function (context) {
-            var leftMemories = this.leftTupleMemory[context.fact.id] || [], lc;
-            for (var i = 0, l = leftMemories.length; i < l; i++) {
-                lc = leftMemories[i];
-                if (lc === context) {
-                    leftMemories.splice(i, 1);
-                    break;
-                }
+        removeFromLeftBlockedMemory: function (context) {
+            var ret = this.leftTupleMemory[context.hashCode] || null;
+            if (ret) {
+                delete this.leftTupleMemory[context.hashCode];
+                ret.data.blocker.blocking.remove(ret);
             }
-            return this;
+            return ret;
         },
 
-        __addToAllTupleMemory: function (context) {
-            var factIds = context.factIds, i = -1, l = factIds.length, factId, allTuples = this.allTuples, tuples;
-            while (++i < l) {
-                factId = factIds[i];
-                tuples = allTuples[factId] = (allTuples[factId] || []);
-                if (indexOf(tuples, context) === -1) {
-                    tuples.push(context);
-                }
+        modifyLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context),
+                leftContext,
+                thisConstraint = this.constraint,
+                rightTuples = this.rightTuples,
+                l = rightTuples.length,
+                isBlocked = false,
+                node, rc, blocker;
+            if (!ctx) {
+                //blocked before
+                ctx = this.removeFromLeftBlockedMemory(context);
+                isBlocked = true;
             }
-            return this;
+            if (ctx) {
+                leftContext = ctx.data;
 
-        },
+                if (leftContext && leftContext.blocker) {
+                    //we were blocked before so only check nodes previous to our blocker
+                    blocker = this.rightMemory[leftContext.blocker.hashCode];
+                }
+                if (blocker) {
+                    thisConstraint.setLeftContext(context);
+                    if (thisConstraint.setRightContext(rc = blocker.data).isMatch()) {
+                        //we cant be proagated so retract previous
+                        if (!isBlocked) {
+                            //we were asserted before so retract
+                            this.__propagate("retract", leftContext.clone());
+                        }
+                        context.blocker = rc;
+                        this.addToLeftBlockedMemory(rc.blocking.push(context));
+                        context = null;
+                    }
+                }
+                if (context && l) {
+                    node = {next: rightTuples.head};
+                    //we were propogated before
+                    thisConstraint.setLeftContext(context);
+                    while ((node = node.next)) {
+                        if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
+                            //we cant be proagated so retract previous
+                            if (!isBlocked) {
+                                //we were asserted before so retract
+                                this.__propagate("retract", leftContext.clone());
+                            }
+                            this.addToLeftBlockedMemory(rc.blocking.push(context));
+                            context.blocker = rc;
+                            context = null;
+                            break;
+                        }
+                    }
+                    thisConstraint.clearContexts();
+                }
+                if (context) {
+                    //we can still be propogated
+                    this.__addToLeftMemory(context);
+                    if (!isBlocked) {
+                        //we weren't blocked before so modify
+                        this.__propagate("modify", context.clone());
+                    } else {
+                        //we were blocked before but aren't now
+                        this.__propagate("assert", context.clone());
+                    }
 
-        __removeFromAllTupleMemory: function (context) {
-            var factIds = context.factIds, i = -1, l = factIds.length, factId, allTuples = this.allTuples, tuples, index;
-            while (++i < l) {
-                factId = factIds[i];
-                tuples = allTuples[factId];
-                index = indexOf(tuples, context);
-                if (index !== -1) {
-                    tuples.splice(i, 1);
                 }
+            } else {
+                throw new Error();
             }
-            return this;
 
         },
 
+        modifyRight: function (context) {
+            var ctx = this.removeFromRightMemory(context);
+            if (ctx) {
+                var rightContext = ctx.data,
+                    leftTuples = this.leftTuples,
+                    leftTuplesLength = leftTuples.length,
+                    leftContext,
+                    thisConstraint = this.constraint,
+                    node,
+                    blocking = rightContext.blocking;
+                this.__addToRightMemory(context);
+                context.blocking = new LinkedList();
+                if (leftTuplesLength || blocking.length) {
+                    if (leftTuplesLength) {
+                        //check currently left tuples in memory
+                        thisConstraint.setRightContext(context);
+                        node = {next: leftTuples.head};
+                        while ((node = node.next)) {
+                            leftContext = node.data;
+                            if (thisConstraint.setLeftContext(leftContext).isMatch()) {
+                                this.__propagate("retract", leftContext.clone());
+                                this.removeFromLeftMemory(leftContext);
+                                this.addToLeftBlockedMemory(context.blocking.push(leftContext));
+                                leftContext.blocker = context;
+                            }
+                        }
+                    }
 
-        __addToLeftMemory: function (context) {
-            this._super(arguments);
-            this.__addToAllTupleMemory(context);
-            return this;
-        },
+                    if (blocking.length) {
+                        var rc;
+                        //check old blocked contexts
+                        //check if the same contexts blocked before are still blocked
+                        var blockingNode = {next: blocking.head};
+                        while ((blockingNode = blockingNode.next)) {
+                            leftContext = blockingNode.data;
+                            leftContext.blocker = null;
+                            thisConstraint.setRightContext(context);
+                            thisConstraint.setLeftContext(leftContext);
+                            if (thisConstraint.isMatch()) {
+                                leftContext.blocker = context;
+                                this.addToLeftBlockedMemory(context.blocking.push(leftContext));
+                                leftContext = null;
+                                return;
+                            } else {
+                                //we arent blocked anymore
+                                leftContext.blocker = null;
+                                node = ctx;
+                                while ((node = node.next)) {
+                                    if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
+                                        leftContext.blocker = rc;
+                                        this.addToLeftBlockedMemory(rc.blocking.push(leftContext));
+                                        leftContext = null;
+                                        break;
+                                    }
+                                }
+                                if (leftContext) {
+                                    this.__addToLeftMemory(leftContext);
+                                    this.__propagate("assert", leftContext.clone());
+                                }
+                                thisConstraint.clearContexts();
+                            }
+                        }
+                        thisConstraint.clearContexts();
+                    }
 
-        __addToLeftTupleMemory: function (context) {
-            var o = context.fact;
-            var lm = this.leftTupleMemory[o.id];
-            if (!lm) {
-                lm = [];
-                this.leftTupleMemory[o.id] = lm;
+                }
+            } else {
+                throw new Error();
             }
-            lm.push(context);
-            this.__addToAllTupleMemory(context);
-            return this;
+
+
         }
     }
 }).as(module);
\ No newline at end of file
diff --git a/lib/nodes/propertyNode.js b/lib/nodes/propertyNode.js
index e83acd1..5b24edd 100644
--- a/lib/nodes/propertyNode.js
+++ b/lib/nodes/propertyNode.js
@@ -24,6 +24,22 @@ AlphaNode.extend({
 
         },
 
+        retract: function (context) {
+            this.__propagate("retract", new Context(context.fact, context.paths));
+        },
+
+        modify: function (context) {
+            var c = new Context(context.fact, context.paths);
+            var variables = this.variables, o = context.fact.object, item;
+            c.set(this.alias, o);
+            for (var i = 0, l = this.varLength; i < l; i++) {
+                item = variables[i];
+                c.set(item[1], o[item[0]]);
+            }
+            this.__propagate("modify", c);
+        },
+
+
         toString: function () {
             return "PropertyNode" + this.__count;
         }
diff --git a/lib/nodes/rightAdapterNode.js b/lib/nodes/rightAdapterNode.js
index 3a5d504..98fa684 100644
--- a/lib/nodes/rightAdapterNode.js
+++ b/lib/nodes/rightAdapterNode.js
@@ -23,7 +23,7 @@ Node.extend({
             this.__propagate("retractResolve", context);
         },
 
-        modify: function (context) {
+        propagateModify: function (context) {
             this.__propagate("modifyRight", context);
         },
 
diff --git a/lib/nodes/terminalNode.js b/lib/nodes/terminalNode.js
index e0d7608..5e9d7b2 100644
--- a/lib/nodes/terminalNode.js
+++ b/lib/nodes/terminalNode.js
@@ -27,6 +27,7 @@ Node.extend({
                 var rule = this.rule, bucket = this.bucket;
                 this.agenda.insert(this, {
                     rule: rule,
+                    hashCode: context.hashCode,
                     index: this.index,
                     name: rule.name,
                     recency: bucket.recency++,
@@ -41,19 +42,20 @@ Node.extend({
         },
 
         modify: function (context) {
+            this.agenda.retract(this, context);
             this.__assertModify(context);
         },
 
-        retract: function (fact) {
-            this.agenda.removeByFact(this, fact);
+        retract: function (context) {
+            this.agenda.retract(this, context);
         },
 
-        retractRight: function (fact) {
-            this.agenda.removeByFact(this, fact);
+        retractRight: function (context) {
+            this.agenda.retract(this, context);
         },
 
-        retractLeft: function (fact) {
-            this.agenda.removeByFact(this, fact);
+        retractLeft: function (context) {
+            this.agenda.retract(this, context);
         },
 
         assertLeft: function (context) {
@@ -64,13 +66,6 @@ Node.extend({
             this.__assertModify(context);
         },
 
-        retractResolve: function (match) {
-            var resolve = this.resolve;
-            this.agenda.retract(this, function (v) {
-                return resolve(v.match, match);
-            });
-        },
-
         toString: function () {
             return "TerminalNode " + this.rule.name;
         }
diff --git a/lib/nodes/typeNode.js b/lib/nodes/typeNode.js
index b3e10ca..b28bf15 100644
--- a/lib/nodes/typeNode.js
+++ b/lib/nodes/typeNode.js
@@ -10,9 +10,15 @@ AlphaNode.extend({
             }
         },
 
+        modify: function (fact) {
+            if (this.constraint.assert(fact.object)) {
+                this.__propagate("modify", fact);
+            }
+        },
+
         retract: function (fact) {
             if (this.constraint.assert(fact.object)) {
-                this.propagateRetract(fact);
+                this.__propagate("retract", fact);
             }
         },
 
@@ -29,8 +35,8 @@ AlphaNode.extend({
         },
 
         __propagate: function (method, fact) {
-            var es = this.__entrySet, i = es.length - 1;
-            for (; i >= 0; i--) {
+            var es = this.__entrySet, i = -1, l = es.length;
+            while (++i < l) {
                 var e = es[i], outNode = e.key, paths = e.value;
                 outNode[method](new Context(fact, paths));
             }
diff --git a/lib/parser/constraint/grammar.js b/lib/parser/constraint/grammar.js
index c367ff6..b8b1689 100644
--- a/lib/parser/constraint/grammar.js
+++ b/lib/parser/constraint/grammar.js
@@ -129,6 +129,7 @@ var grammar = {
             "IDENTIFIER_EXPRESSION",
             [ "OBJECT_EXPRESSION . IDENTIFIER_EXPRESSION", "$$ = [$1,$3, 'prop'];" ],
             [ "OBJECT_EXPRESSION [ STRING_EXPRESSION ]", "$$ = [$1,$3, 'propLookup'];" ],
+            [ "OBJECT_EXPRESSION [ NUMBER_EXPRESSION ]", "$$ = [$1,$3, 'propLookup'];" ],
             [ "OBJECT_EXPRESSION [ OBJECT_EXPRESSION ]", "$$ = [$1,$3, 'propLookup'];" ],
             [ "OBJECT_EXPRESSION ( )", "$$ = [$1, [null, null, 'arguments'], 'function']"],
             [ "OBJECT_EXPRESSION ( ARGUMENT_LIST )", "$$ = [$1, $3, 'function']"]
diff --git a/lib/parser/constraint/parser.js b/lib/parser/constraint/parser.js
index 4e7f0be..d4e2341 100644
--- a/lib/parser/constraint/parser.js
+++ b/lib/parser/constraint/parser.js
@@ -74,9 +74,9 @@
 var parser = (function(){
 var parser = {trace: function trace() { },
 yy: {},
-symbols_: {"error":2,"expressions":3,"EXPRESSION":4,"EOF":5,"UNARY_EXPRESSION":6,"LITERAL_EXPRESSION":7,"-":8,"!":9,"MULTIPLICATIVE_EXPRESSION":10,"*":11,"/":12,"%":13,"ADDITIVE_EXPRESSION":14,"+":15,"EXPONENT_EXPRESSION":16,"^":17,"RELATIONAL_EXPRESSION":18,"<":19,">":20,"<=":21,">=":22,"EQUALITY_EXPRESSION":23,"==":24,"!=":25,"=~":26,"!=~":27,"IN_EXPRESSION":28,"in":29,"ARRAY_EXPRESSION":30,"notIn":31,"OBJECT_EXPRESSION":32,"AND_EXPRESSION":33,"&&":34,"OR_EXPRESSION":35,"||":36,"ARGUMENT_LIST":37,",":38,"IDENTIFIER_EXPRESSION":39,"IDENTIFIER":40,".":41,"[":42,"STRING_EXPRESSION":43,"]":44,"(":45,")":46,"STRING":47,"NUMBER_EXPRESSION":48,"NUMBER":49,"REGEXP_EXPRESSION":50,"REGEXP":51,"BOOLEAN_EXPRESSION":52,"BOOLEAN":53,"NULL_EXPRESSION":54,"NULL":55,"$accept":0,"$end":1},
-terminals_: {2:"error",5:"EOF",8:"-",9:"!",11:"*",12:"/",13:"%",15:"+",17:"^",19:"<",20:">",21:"<=",22:">=",24:"==",25:"!=",26:"=~",27:"!=~",29:"in",31:"notIn",34:"&&",36:"||",38:",",40:"IDENTIFIER",41:".",42:"[",44:"]",45:"(",46:")",47:"STRING",49:"NUMBER",51:"REGEXP",53:"BOOLEAN",55:"NULL"},
-productions_: [0,[3,2],[6,1],[6,2],[6,2],[10,1],[10,3],[10,3],[10,3],[14,1],[14,3],[14,3],[16,1],[16,3],[18,1],[18,3],[18,3],[18,3],[18,3],[23,1],[23,3],[23,3],[23,3],[23,3],[28,1],[28,3],[28,3],[28,3],[28,3],[33,1],[33,3],[35,1],[35,3],[37,1],[37,3],[39,1],[32,1],[32,3],[32,4],[32,4],[32,3],[32,4],[43,1],[48,1],[50,1],[52,1],[54,1],[30,2],[30,3],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,3],[4,1]],
+symbols_: {"error":2,"expressions":3,"EXPRESSION":4,"EOF":5,"UNARY_EXPRESSION":6,"LITERAL_EXPRESSION":7,"-":8,"!":9,"MULTIPLICATIVE_EXPRESSION":10,"*":11,"/":12,"%":13,"ADDITIVE_EXPRESSION":14,"+":15,"EXPONENT_EXPRESSION":16,"^":17,"RELATIONAL_EXPRESSION":18,"<":19,">":20,"<=":21,">=":22,"EQUALITY_EXPRESSION":23,"==":24,"!=":25,"=~":26,"!=~":27,"IN_EXPRESSION":28,"in":29,"ARRAY_EXPRESSION":30,"notIn":31,"OBJECT_EXPRESSION":32,"AND_EXPRESSION":33,"&&":34,"OR_EXPRESSION":35,"||":36,"ARGUMENT_LIST":37,",":38,"IDENTIFIER_EXPRESSION":39,"IDENTIFIER":40,".":41,"[":42,"STRING_EXPRESSION":43,"]":44,"NUMBER_EXPRESSION":45,"(":46,")":47,"STRING":48,"NUMBER":49,"REGEXP_EXPRESSION":50,"REGEXP":51,"BOOLEAN_EXPRESSION":52,"BOOLEAN":53,"NULL_EXPRESSION":54,"NULL":55,"$accept":0,"$end":1},
+terminals_: {2:"error",5:"EOF",8:"-",9:"!",11:"*",12:"/",13:"%",15:"+",17:"^",19:"<",20:">",21:"<=",22:">=",24:"==",25:"!=",26:"=~",27:"!=~",29:"in",31:"notIn",34:"&&",36:"||",38:",",40:"IDENTIFIER",41:".",42:"[",44:"]",46:"(",47:")",48:"STRING",49:"NUMBER",51:"REGEXP",53:"BOOLEAN",55:"NULL"},
+productions_: [0,[3,2],[6,1],[6,2],[6,2],[10,1],[10,3],[10,3],[10,3],[14,1],[14,3],[14,3],[16,1],[16,3],[18,1],[18,3],[18,3],[18,3],[18,3],[23,1],[23,3],[23,3],[23,3],[23,3],[28,1],[28,3],[28,3],[28,3],[28,3],[33,1],[33,3],[35,1],[35,3],[37,1],[37,3],[39,1],[32,1],[32,3],[32,4],[32,4],[32,4],[32,3],[32,4],[43,1],[45,1],[50,1],[52,1],[54,1],[30,2],[30,3],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,3],[4,1]],
 performAction: function anonymous(yytext, yyleng, yylineno, yy, yystate /* action[1] */, $$ /* vstack */, _$ /* lstack */) {
 /* this == yyval */
 
@@ -138,29 +138,31 @@ case 38:this.$ = [$$[$0-3],$$[$0-1], 'propLookup'];
 break;
 case 39:this.$ = [$$[$0-3],$$[$0-1], 'propLookup'];
 break;
-case 40:this.$ = [$$[$0-2], [null, null, 'arguments'], 'function']
+case 40:this.$ = [$$[$0-3],$$[$0-1], 'propLookup'];
 break;
-case 41:this.$ = [$$[$0-3], $$[$0-1], 'function']
+case 41:this.$ = [$$[$0-2], [null, null, 'arguments'], 'function']
 break;
-case 42:this.$ = [String(yytext.replace(/^['|"]|['|"]$/g, '')), null, 'string'];
+case 42:this.$ = [$$[$0-3], $$[$0-1], 'function']
 break;
-case 43:this.$ = [Number(yytext), null, 'number'];
+case 43:this.$ = [String(yytext.replace(/^['|"]|['|"]$/g, '')), null, 'string'];
 break;
-case 44:this.$ = [yytext, null, 'regexp'];
+case 44:this.$ = [Number(yytext), null, 'number'];
 break;
-case 45:this.$ = [yytext.replace(/^\s+/, '') == 'true', null, 'boolean'];
+case 45:this.$ = [yytext, null, 'regexp'];
 break;
-case 46:this.$ = [null, null, 'null'];
+case 46:this.$ = [yytext.replace(/^\s+/, '') == 'true', null, 'boolean'];
 break;
-case 47:this.$ = [null, null, 'array'];
+case 47:this.$ = [null, null, 'null'];
 break;
-case 48:this.$ = [$$[$0-1], null, 'array'];
+case 48:this.$ = [null, null, 'array'];
 break;
-case 56:this.$ = [$$[$0-1], null, 'composite']
+case 49:this.$ = [$$[$0-1], null, 'array'];
+break;
+case 57:this.$ = [$$[$0-1], null, 'composite']
 break;
 }
 },
-table: 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],22:[2,16],24:[2,16],25:[2,16],26:[2,16],27:[2,16],34:[2,16],36:[2,16],47:[2,16]},{5:[2,17],17:[1,48],19:[2,17],20:[2,17],21:[2,17],22:[2,17],24:[2,17],25:[2,17],26:[2,17],27:[2,17],34:[2,17],36:[2,17],47:[2,17]},{5:[2,18],17:[1,48],19:[2,18],20:[2,18],21:[2,18],22:[2,18],24:[2,18],25:[2,18],26:[2,18],27:[2,18],34:[2,18],36:[2,18],47:[2,18]},{5:[2,37],8:[2,37],11:[2,37],12:[2,37],13:[2,37],15:[2,37],17:[2,37],19:[2,37],20:[2,37],21:[2,37],22:[2,37],24:[2,37],25:[2,37],26:[2,37],27:[2,37],29:[2,37],31:[2,37],34:[2,37],36:[2,37],38:[2,37],41:[2,37],42:[2,37],44:[2,37],46:[2,37],47:[2,37]},{44:[1,89]},{44:[1,90]},{41:[1,44],42:[1,45],44:[1,91],46:[1,46]},{5:[2,41],8:[2,41],11:[2,41],12:[2,41],13:[2,41],15:[2,41],17:[2,41],19:[2,41],20:[2,41],21:[2,41],22:[2,41],24:[2,41],25:[2,41],26:[2,41],27:[2,41],29:[2,41],31:[2,41],34:[2,41],36:[2,41],38:[2,41],41:[2,41],42:[2,41],44:[2,41],46:[2,41],47:[2,41]},{38:[1,83],47:[1,92]},{5:[2,57],8:[2,57],11:[2,57],12:[2,57],13:[2,57],15:[2,57],17:[2,57],19:[2,57],20:[2,57],21:[2,57],22:[2,57],24:[2,57],25:[2,57],26:[2,57],27:[2,57],29:[2,57],31:[2,57],34:[2,57],36:[2,57],38:[2,57],44:[2,57],47:[2,57]},{5:[2,13],8:[1,53],15:[1,52],17:[2,13],19:[2,13],20:[2,13],21:[2,13],22:[2,13],24:[2,13],25:[2,13],26:[2,13],27:[2,13],34:[2,13],36:[2,13],47:[2,13]},{5:[2,49],8:[2,49],11:[2,49],12:[2,49],13:[2,49],15:[2,49],17:[2,49],19:[2,49],20:[2,49],21:[2,49],22:[2,49],24:[2,49],25:[2,49],26:[2,49],27:[2,49],29:[2,49],31:[2,49],34:[2,49],36:[2,49],38:[2,49],44:[2,49],47:[2,49]},{7:93,30:15,32:14,39:23,40:[1,26],42:[1,24],43:9,45:10,46:[1,16],48:[1,18],49:[1,19],50:11,51:[1,20],52:12,53:[1,21],54:13,55:[1,22]},{5:[2,10],8:[2,10],11:[1,54],12:[1,55],13:[1,56],15:[2,10],17:[2,10],19:[2,10],20:[2,10],21:[2,10],22:[2,10],24:[2,10],25:[2,10],26:[2,10],27:[2,10],34:[2,10],36:[2,10],47:[2,10]},{5:[2,11],8:[2,11],11:[1,54],12:[1,55],13:[1,56],15:[2,11],17:[2,11],19:[2,11],20:[2,11],21:[2,11],22:[2,11],24:[2,11],25:[2,11],26:[2,11],27:[2,11],34:[2,11],36:[2,11],47:[2,11]},{5:[2,6],8:[2,6],11:[2,6],12:[2,6],13:[2,6],15:[2,6],17:[2,6],19:[2,6],20:[2,6],21:[2,6],22:[2,6],24:[2,6],25:[2,6],26:[2,6],27:[2,6],34:[2,6],36:[2,6],47:[2,6]},{5:[2,7],8:[2,7],11:[2,7],12:[2,7],13:[2,7],15:[2,7],17:[2,7],19:[2,7],20:[2,7],21:[2,7],22:[2,7],24:[2,7],25:[2,7],26:[2,7],27:[2,7],34:[2,7],36:[2,7],47:[2,7]},{5:[2,8],8:[2,8],11:[2,8],12:[2,8],13:[2,8],15:[2,8],17:[2,8],19:[2,8],20:[2,8],21:[2,8],22:[2,8],24:[2,8],25:[2,8],26:[2,8],27:[2,8],34:[2,8],36:[2,8],47:[2,8]},{5:[2,38],8:[2,38],11:[2,38],12:[2,38],13:[2,38],15:[2,38],17:[2,38],19:[2,38],20:[2,38],21:[2,38],22:[2,38],24:[2,38],25:[2,38],26:[2,38],27:[2,38],29:[2,38],31:[2,38],34:[2,38],36:[2,38],38:[2,38],41:[2,38],42:[2,38],44:[2,38],46:[2,38],47:[2,38]},{5:[2,39],8:[2,39],11:[2,39],12:[2,39],13:[2,39],15:[2,39],17:[2,39],19:[2,39],20:[2,39],21:[2,39],22:[2,39],24:[2,39],25:[2,39],26:[2,39],27:[2,39],29:[2,39],31:[2,39],34:[2,39],36:[2,39],38:[2,39],41:[2,39],42:[2,39],44:[2,39],46:[2,39],47:[2,39]},{5:[2,40],8:[2,40],11:[2,40],12:[2,40],13:[2,40],15:[2,40],17:[2,40],19:[2,40],20:[2,40],21:[2,40],22:[2,40],24:[2,40],25:[2,40],26:[2,40],27:[2,40],29:[2,40],31:[2,40],34:[2,40],36:[2,40],38:[2,40],41:[2,40],42:[2,40],44:[2,40],46:[2,40],47:[2,40]},{5:[2,42],8:[2,42],11:[2,42],12:[2,42],13:[2,42],15:[2,42],17:[2,42],19:[2,42],20:[2,42],21:[2,42],22:[2,42],24:[2,42],25:[2,42],26:[2,42],27:[2,42],29:[2,42],31:[2,42],34:[2,42],36:[2,42],38:[2,42],41:[2,42],42:[2,42],44:[2,42],46:[2,42],47:[2,42]},{38:[2,34],44:[2,34],47:[2,34]}],
 defaultActions: {31:[2,1]},
 parseError: function parseError(str, hash) {
     if (hash.recoverable) {
@@ -652,9 +654,9 @@ case 15:/* skip whitespace */
 break;
 case 16:return 49;
 break;
-case 17:return 47;
+case 17:return 48;
 break;
-case 18:return 47;
+case 18:return 48;
 break;
 case 19:return 40;
 break;
@@ -700,13 +702,13 @@ case 39:return 15;
 break;
 case 40:return 17;
 break;
-case 41:return 45;
+case 41:return 46;
 break;
 case 42:return 44;
 break;
 case 43:return 42;
 break;
-case 44:return 46;
+case 44:return 47;
 break;
 case 45:return 9;
 break;
diff --git a/lib/parser/nools/nool.parser.js b/lib/parser/nools/nool.parser.js
index 60f8f15..71d4012 100644
--- a/lib/parser/nools/nool.parser.js
+++ b/lib/parser/nools/nool.parser.js
@@ -7,7 +7,7 @@ var tokens = require("./tokens.js"),
 
 var parse = function (src, keywords, context) {
     var orig = src;
-    src = src.replace(/\/\/(.*)[\n|\r|\r\n]/g, "").replace(/\n|\r|\r\n/g, " ");
+    src = src.replace(/\/\/(.*)/g, "").replace(/\n|\r|\r\n/g, " ");
 
     var blockTypes = new RegExp("^(" + keys(keywords).join("|") + ")"), index;
     while (src && (index = utils.findNextTokenIndex(src)) !== -1) {
diff --git a/lib/parser/nools/tokens.js b/lib/parser/nools/tokens.js
index c1cc91e..98e918b 100644
--- a/lib/parser/nools/tokens.js
+++ b/lib/parser/nools/tokens.js
@@ -85,6 +85,7 @@ var ruleTokens = {
         };
         var constraintRegExp = /(\{ *(?:["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']? *(?:, *["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']?)*)+ *\})/;
         var predicateExp = /^(\w+) *\((.*)\)$/m;
+        var fromRegExp = /(\bfrom\s+.*)/;
         var parseRules = function (str) {
             var rules = [];
             var ruleLines = str.split(";"), l = ruleLines.length, ruleLine;
@@ -107,9 +108,14 @@ var ruleTokens = {
                     if (parts && parts.length) {
                         rule.push(parts[2], parts[1]);
                         var constraints = parts[3].replace(/^\s*|\s*$/g, "");
-                        var hashParts = constraints.match(constraintRegExp);
+                        var hashParts = constraints.match(constraintRegExp), from = null, fromMatch;
                         if (hashParts) {
                             var hash = hashParts[1], constraint = constraints.replace(hash, "");
+                            if (fromRegExp.test(constraint)) {
+                                fromMatch = constraint.match(fromRegExp);
+                                from = fromMatch[0];
+                                constraint = constraint.replace(fromMatch[0], "");
+                            }
                             if (constraint) {
                                 rule.push(constraint.replace(/^\s*|\s*$/g, ""));
                             }
@@ -117,8 +123,16 @@ var ruleTokens = {
                                 rule.push(eval("(" + hash.replace(/(\$?\w+)\s*:\s*(\$?\w+)/g, '"$1" : "$2"') + ")"));
                             }
                         } else if (constraints && !isWhiteSpace(constraints)) {
+                            if (fromRegExp.test(constraints)) {
+                                fromMatch = constraints.match(fromRegExp);
+                                from = fromMatch[0];
+                                constraints = constraints.replace(fromMatch[0], "");
+                            }
                             rule.push(constraints);
                         }
+                        if (from) {
+                            rule.push(from);
+                        }
                         rules.push(rule);
                     } else {
                         throw new Error("Invalid constraint " + ruleLine);
diff --git a/lib/pattern.js b/lib/pattern.js
index 1a98eec..7c389fb 100644
--- a/lib/pattern.js
+++ b/lib/pattern.js
@@ -1,93 +1,145 @@
-(function () {
-    "use strict";
-    var extd = require("./extended"),
-        merge = extd.merge,
-        forEach = extd.forEach,
-        declare = extd.declare,
-        constraintMatcher = require("./constraintMatcher"),
-        constraint = require("./constraint");
-
-
-    var Pattern = declare({});
-
-    var ObjectPattern = Pattern.extend({
-        instance: {
-            constructor: function (type, alias, conditions, store, options) {
-                options = options || {};
-                this.type = type;
-                this.alias = alias;
-                this.conditions = conditions;
-                this.pattern = options.pattern;
-                this.constraints = [new constraint.ObjectConstraint(type)];
-                var constrnts = constraintMatcher.toConstraints(conditions, merge({alias: alias}, options));
-                if (constrnts.length) {
-                    this.constraints = this.constraints.concat(constrnts);
-                } else {
-                    var cnstrnt = new constraint.TrueConstraint();
-                    this.constraints.push(cnstrnt);
-                }
-                if (store && !extd.isEmpty(store)) {
-                    var atm = new constraint.HashConstraint(store);
-                    this.constraints.push(atm);
+"use strict";
+var extd = require("./extended"),
+    isEmpty = extd.isEmpty,
+    merge = extd.merge,
+    forEach = extd.forEach,
+    declare = extd.declare,
+    constraintMatcher = require("./constraintMatcher"),
+    constraint = require("./constraint"),
+    EqualityConstraint = constraint.EqualityConstraint;
+
+var id = 0;
+var Pattern = declare({});
+
+var ObjectPattern = Pattern.extend({
+    instance: {
+        constructor: function (type, alias, conditions, store, options) {
+            options = options || {};
+            this.id = id++;
+            this.type = type;
+            this.alias = alias;
+            this.conditions = conditions;
+            this.pattern = options.pattern;
+            var constraints = [new constraint.ObjectConstraint(type)];
+            var constrnts = constraintMatcher.toConstraints(conditions, merge({alias: alias}, options));
+            if (constrnts.length) {
+                constraints = constraints.concat(constrnts);
+            } else {
+                var cnstrnt = new constraint.TrueConstraint();
+                constraints.push(cnstrnt);
+            }
+            if (store && !isEmpty(store)) {
+                var atm = new constraint.HashConstraint(store);
+                constraints.push(atm);
+            }
+
+            forEach(constraints, function (constraint) {
+                constraint.set("alias", alias);
+            });
+            this.constraints = constraints;
+        },
+
+        getSpecificity: function () {
+            var constraints = this.constraints, specificity = 0;
+            for (var i = 0, l = constraints.length; i < l; i++) {
+                if (constraints[i] instanceof EqualityConstraint) {
+                    specificity++;
                 }
-                forEach(this.constraints, function (constraint) {
-                    constraint.set("alias", alias);
-                });
-            },
-
-            hasConstraint: function (type) {
-                return extd.some(this.constraints, function (c) {
-                    return c instanceof type;
-                });
-            },
-
-            hashCode: function () {
-                return [this.type, this.alias, extd.format("%j", this.conditions)].join(":");
-            },
-
-            toString: function () {
-                return extd.format("%j", this.constraints);
             }
+            return specificity;
+        },
+
+        hasConstraint: function (type) {
+            return extd.some(this.constraints, function (c) {
+                return c instanceof type;
+            });
+        },
+
+        hashCode: function () {
+            return [this.type, this.alias, extd.format("%j", this.conditions)].join(":");
+        },
+
+        toString: function () {
+            return extd.format("%j", this.constraints);
         }
-    }).as(exports, "ObjectPattern");
+    }
+}).as(exports, "ObjectPattern");
+
+var FromPattern = ObjectPattern.extend({
+    instance: {
+        constructor: function (type, alias, conditions, store, from, options) {
+            this._super([type, alias, conditions, store, options]);
+            this.from = from.from;
+        },
+
+        hasConstraint: function (type) {
+            return extd.some(this.constraints, function (c) {
+                return c instanceof type;
+            });
+        },
+
+        getSpecificity: function () {
+            return this._super(arguments) + 1;
+        },
+
+        hashCode: function () {
+            return [this.type, this.alias, extd.format("%j", this.conditions), this.from.from].join(":");
+        },
+
+        toString: function () {
+            return extd.format("%j from %s", this.constraints, this.from.from);
+        }
+    }
+}).as(exports, "FromPattern");
 
-    ObjectPattern.extend().as(exports, "NotPattern");
 
-    Pattern.extend({
+FromPattern.extend().as(exports, "FromNotPattern");
+ObjectPattern.extend().as(exports, "NotPattern");
 
-        instance: {
-            constructor: function (left, right) {
-                this.leftPattern = left;
-                this.rightPattern = right;
-            },
+Pattern.extend({
 
-            hashCode: function () {
-                return [this.leftPattern.hashCode(), this.rightPattern.hashCode()].join(":");
-            },
+    instance: {
+        constructor: function (left, right) {
+            this.id = id++;
+            this.leftPattern = left;
+            this.rightPattern = right;
+        },
 
-            getters: {
-                constraints: function () {
-                    return this.leftPattern.constraints.concat(this.rightPattern.constraints);
-                }
+        hashCode: function () {
+            return [this.leftPattern.hashCode(), this.rightPattern.hashCode()].join(":");
+        },
+
+        getSpecificity: function () {
+            return this.rightPattern.getSpecificity() + this.leftPattern.getSpecificity();
+        },
+
+        getters: {
+            constraints: function () {
+                return this.leftPattern.constraints.concat(this.rightPattern.constraints);
             }
         }
+    }
 
-    }).as(exports, "CompositePattern");
+}).as(exports, "CompositePattern");
 
 
-    var InitialFact = declare({}).as(exports, "InitialFact");
+var InitialFact = declare({
+    constuctor: function(){
+        this.id = id++;
+    }
+}).as(exports, "InitialFact");
 
-    ObjectPattern.extend({
-        instance: {
-            constructor: function () {
-                this._super([InitialFact, "i", [], {}]);
-            },
+ObjectPattern.extend({
+    instance: {
+        constructor: function () {
+            this._super([InitialFact, "i", [], {}]);
+        },
 
-            assert: function () {
-                return true;
-            }
+        assert: function () {
+            return true;
         }
-    }).as(exports, "InitialFactPattern");
+    }
+}).as(exports, "InitialFactPattern");
+
 
-})();
 
diff --git a/lib/rule.js b/lib/rule.js
index 1dd4b66..12eb172 100644
--- a/lib/rule.js
+++ b/lib/rule.js
@@ -3,12 +3,63 @@ var extd = require("./extended"),
     isArray = extd.isArray,
     Promise = extd.Promise,
     declare = extd.declare,
+    isHash = extd.isHash,
+    isString = extd.isString,
+    format = extd.format,
     parser = require("./parser"),
     pattern = require("./pattern"),
     ObjectPattern = pattern.ObjectPattern,
+    FromPattern = pattern.FromPattern,
     NotPattern = pattern.NotPattern,
+    FromNotPattern = pattern.FromNotPattern,
     CompositePattern = pattern.CompositePattern;
 
+var parseExtra = extd
+    .switcher()
+    .isUndefinedOrNull(function () {
+        return null;
+    })
+    .isLike(/^from +/, function (s) {
+        return {from: s.replace(/^from +/, "").replace(/^\s*|\s*$/g, "")};
+    })
+    .def(function (o) {
+        throw new Error("invalid rule constraint option " + o);
+    })
+    .switcher();
+
+var normailizeConstraint = extd
+    .switcher()
+    .isLength(1, function (c) {
+        throw new Error("invalid rule constraint " + format("%j", [c]));
+    })
+    .isLength(2, function (c) {
+        c.push("true");
+        return c;
+    })
+    //handle case where c[2] is a hash rather than a constraint string
+    .isLength(3, function (c) {
+        if (isHash(c[2])) {
+            c.splice(2, 0, "true");
+        }
+        return c;
+    })
+    //handle case where c[3] is a from clause rather than a hash for references
+    .isLength(4, function (c) {
+        if (isString(c[3])) {
+            c.splice(3, 0, null);
+            c[4] = parseExtra(c[4]);
+        }
+        return c;
+    })
+    .def(function (c) {
+        if (c.length === 5) {
+            c[4] = parseExtra(c[4]);
+        }
+        return c;
+    })
+    .switcher();
+
+
 var getParamTypeSwitch = extd
     .switcher()
     .isEq("string", function () {
@@ -68,29 +119,56 @@ var parsePattern = extd
     })
     .contains("not", 0, function (condition) {
         condition.shift();
-        return [
-            new NotPattern(
-                getParamType(condition[0]),
-                condition[1] || "m",
-                parser.parseConstraint(condition[2] || "true"),
-                condition[3] || {},
-                {scope: condition.scope, pattern: condition[2]}
-            )
-        ];
+        condition = normailizeConstraint(condition);
+        if (condition[4] && condition[4].from) {
+            return [
+                new FromNotPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    condition[4],
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        } else {
+            return [
+                new NotPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        }
     })
     .def(function (condition) {
-        return [
-            new ObjectPattern(
-                getParamType(condition[0]),
-                condition[1] || "m",
-                parser.parseConstraint(condition[2] || "true"),
-                condition[3] || {},
-                {scope: condition.scope, pattern: condition[2]}
-            )
-        ];
+        condition = normailizeConstraint(condition);
+        if (condition[4] && condition[4].from) {
+            return [
+                new FromPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    condition[4],
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        } else {
+            return [
+                new ObjectPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        }
     }).switcher();
 
-
 var Rule = declare({
     instance: {
         constructor: function (name, options, pattern, cb) {
@@ -121,7 +199,7 @@ var Rule = declare({
 });
 
 function createRule(name, options, conditions, cb) {
-    if (extd.isArray(options)) {
+    if (isArray(options)) {
         cb = conditions;
         conditions = options;
     } else {
diff --git a/lib/workingMemory.js b/lib/workingMemory.js
index 9a66546..c3c9287 100644
--- a/lib/workingMemory.js
+++ b/lib/workingMemory.js
@@ -1,8 +1,7 @@
 "use strict";
-var declare = require("declare.js");
-
-
-var id = 0;
+var declare = require("declare.js"),
+    LinkedList = require("./linkedList"),
+    id = 0;
 
 var Fact = declare({
 
@@ -30,26 +29,69 @@ declare({
 
         constructor: function () {
             this.recency = 0;
-            this.facts = [];
+            this.facts = new LinkedList();
         },
 
         dispose: function () {
-            this.facts.length = 0;
+            this.facts.clear();
+        },
+
+        getFactHandle: function (o) {
+            var head = {next: this.facts.head}, ret;
+            while ((head = head.next)) {
+                var existingFact = head.data;
+                if (existingFact.equals(o)) {
+                    return existingFact;
+                }
+            }
+            if (!ret) {
+                ret = new Fact(o);
+                ret.recency = this.recency++;
+                //this.facts.push(ret);
+            }
+            return ret;
+        },
+
+        modifyFact: function (fact) {
+            var head = {next: this.facts.head};
+            while ((head = head.next)) {
+                var existingFact = head.data;
+                if (existingFact.equals(fact)) {
+                    existingFact.recency = this.recency++;
+                    return existingFact;
+                }
+            }
+            //if we made it here we did not find the fact
+            throw new Error("the fact to modify does not exist");
         },
 
         assertFact: function (fact) {
-            fact = new Fact(fact);
-            fact.recency = this.recency++;
-            this.facts.push(fact);
-            return fact;
+            var ret = new Fact(fact);
+            ret.recency = this.recency++;
+            this.facts.push(ret);
+            return ret;
+//            var head = {next: this.facts.head}, ret;
+//            while ((head = head.next)) {
+//                var existingFact = head.data;
+//                if (existingFact.equals(fact)) {
+//                    ret = existingFact;
+//                    break;
+//                }
+//            }
+//            if (!ret) {
+//                ret = new Fact(fact);
+//                ret.recency = this.recency++;
+//                this.facts.push(ret);
+//            }
+//            return ret;
         },
 
         retractFact: function (fact) {
-            var facts = this.facts, l = facts.length, i = -1, existingFact;
-            while (++i < l) {
-                existingFact = facts[i];
+            var facts = this.facts, head = {next: facts.head};
+            while ((head = head.next)) {
+                var existingFact = head.data;
                 if (existingFact.equals(fact)) {
-                    this.facts.splice(i, 1);
+                    facts.remove(head);
                     return existingFact;
                 }
             }
diff --git a/nools.js b/nools.js
index 110d6c6..3802591 100644
--- a/nools.js
+++ b/nools.js
@@ -25,45 +25,16 @@
 
 },{"../":2}],2:[function(require,module,exports){
 module.exports = exports = require("./lib");
-},{"./lib":14}],3:[function(require,module,exports){
+},{"./lib":15}],3:[function(require,module,exports){
 "use strict";
 var extd = require("./extended"),
-    indexOf = extd.indexOf,
+//indexOf = extd.indexOf,
     declare = extd.declare,
     AVLTree = extd.AVLTree,
     LinkedList = extd.LinkedList,
-    EventEmitter = require("events").EventEmitter;
-
-var sortAgenda = function (a, b) {
-    /*jshint noempty:false*/
-    if (a === b) {
-        return 0;
-    }
-    var ret;
-    var p1 = a.rule.priority, p2 = b.rule.priority;
-    if (p1 !== p2) {
-        ret = p1 - p2;
-    } else if (a.counter !== b.counter) {
-        ret = a.counter - b.counter;
-    }
-    if (!ret) {
+    EventEmitter = require("events").EventEmitter,
+    sortAgenda = require("./conflict").strategy(["salience", "activationRecency"]);
 
-        var i = 0;
-        var aMatchRecency = a.match.recency,
-            bMatchRecency = b.match.recency, aLength = aMatchRecency.length - 1, bLength = bMatchRecency.length - 1;
-        while (aMatchRecency[i] === bMatchRecency[i] && i < aLength && i < bLength && i++) {
-        }
-        ret = aMatchRecency[i] - bMatchRecency[i];
-        if (!ret) {
-            ret = aLength - bLength;
-        }
-        //   }
-    }
-    if (!ret) {
-        ret = a.recency - b.recency;
-    }
-    return ret > 0 ? 1 : -1;
-};
 
 var FactHash = declare({
     instance: {
@@ -75,60 +46,33 @@ var FactHash = declare({
         clear: function () {
             this.memoryValues.clear();
             this.memory = {};
-            this.memory.length = this.memoryValues.length = 0;
-        },
-
-        get: function (k) {
-            var node = this.memory[k.id];
-            return node ? node.data : [];
         },
 
 
         remove: function (v) {
-            var facts = v.match.facts,
-                l = facts.length,
-                mv = this.memoryValues,
-                m = this.memory,
-                i = -1,
-                arr, index, node, fId;
-            while (++i < l) {
-                fId = facts[i].id;
-                node = m[fId];
-                arr = node.data;
-                index = indexOf(arr, v);
-                arr.splice(index, 1);
-                if (arr.length === 0) {
-                    mv.remove(node);
-                    delete m[fId];
-                }
+            var hashCode = v.hashCode,
+                memory = this.memory,
+                ret = memory[hashCode];
+            if (ret) {
+                this.memoryValues.remove(ret);
+                delete memory[hashCode];
             }
+            return ret;
         },
 
         insert: function (insert) {
-            var facts = insert.match.facts,
-                mv = this.memoryValues,
-                m = this.memory,
-                l = facts.length,
-                i = -1,
-                node, o, arr, fId;
-            while (++i < l) {
-                o = facts[i];
-                fId = o.id;
-                node = m[o.id];
-                if (!node) {
-                    m[fId] = mv.push((arr = []));
-                } else {
-                    arr = node.data;
-                }
-                arr.push(insert);
+            var hashCode = insert.hashCode;
+            if (hashCode in this.memory) {
+                throw new Error("Activation already in agenda " + insert.rule.name + " agenda");
             }
+            this.memoryValues.push((this.memory[hashCode] = insert));
         }
     }
 
 });
 
 
-var REVERSE_ORDER = AVLTree.REVERSE_ORDER, DEFAULT_AGENDA_GROUP = "main";
+var DEFAULT_AGENDA_GROUP = "main";
 module.exports = declare(EventEmitter, {
 
     instance: {
@@ -222,30 +166,27 @@ module.exports = declare(EventEmitter, {
             return v;
         },
 
-        removeByFact: function (node, fact) {
-            var rule = this.rules[node.name], tree = rule.tree, factTable = rule.factTable;
-            var ma = this.getAgendaGroup(node.rule.agendaGroup);
-            var remove = factTable.get(fact) || [];
-            var i = remove.length, r;
-            while (--i > -1) {
-                r = remove[i];
-                factTable.remove(r);
-                tree.remove(r);
-                ma.remove(r);
+        peek: function () {
+            var tree = this.getFocusedAgenda(), root = tree.__root;
+            while (root.right) {
+                root = root.right;
             }
-            remove.length = 0;
+            return root.data;
         },
 
-        retract: function (node, cb) {
-            var rule = this.rules[node.name], tree = rule.tree, factTable = rule.factTable;
-            var ma = this.getAgendaGroup(node.rule.agendaGroup);
-            tree.traverse(tree.__root, REVERSE_ORDER, function (v) {
-                if (cb(v)) {
-                    factTable.remove(v);
-                    ma.remove(v);
-                    tree.remove(v);
-                }
-            });
+        modify: function (node, context) {
+            this.retract(node, context);
+            this.insert(node, context);
+        },
+
+        retract: function (node, retract) {
+            var rule = this.rules[node.name];
+            retract.rule = node;
+            var activation = rule.factTable.remove(retract);
+            if (activation) {
+                this.getAgendaGroup(node.rule.agendaGroup).remove(activation);
+                rule.tree.remove(activation);
+            }
         },
 
         insert: function (node, insert) {
@@ -278,7 +219,7 @@ module.exports = declare(EventEmitter, {
     }
 
 });
-},{"./extended":11,"events":47}],4:[function(require,module,exports){
+},{"./conflict":7,"./extended":12,"events":50}],4:[function(require,module,exports){
 /*jshint evil:true*/
 "use strict";
 var extd = require("../extended"),
@@ -335,7 +276,7 @@ var createDefined = (function () {
 
 exports.createFunction = createFunction;
 exports.createDefined = createDefined;
-},{"../extended":11}],5:[function(require,module,exports){
+},{"../extended":12}],5:[function(require,module,exports){
 var Buffer=require("__browserify_Buffer").Buffer;/*jshint evil:true*/
 "use strict";
 var extd = require("../extended"),
@@ -526,7 +467,7 @@ exports.transpile = require("./transpile").transpile;
 
 
 
-},{"../constraintMatcher.js":8,"../extended":11,"../parser":31,"../rule":36,"./common":4,"./transpile":6,"__browserify_Buffer":50}],6:[function(require,module,exports){
+},{"../constraintMatcher.js":9,"../extended":12,"../parser":34,"../rule":39,"./common":4,"./transpile":6,"__browserify_Buffer":53}],6:[function(require,module,exports){
 var Buffer=require("__browserify_Buffer").Buffer;var extd = require("../extended"),
     forEach = extd.forEach,
     indexOf = extd.indexOf,
@@ -678,16 +619,73 @@ exports.transpile = function (flowObj, options) {
 
 
 
-},{"../constraintMatcher":8,"../extended":11,"../parser":31,"__browserify_Buffer":50}],7:[function(require,module,exports){
+},{"../constraintMatcher":9,"../extended":12,"../parser":34,"__browserify_Buffer":53}],7:[function(require,module,exports){
+var map = require("./extended").map;
+
+function salience(a, b) {
+    return a.rule.priority - b.rule.priority;
+}
+
+function bucketCounter(a, b) {
+    return a.counter - b.counter;
+}
+
+function factRecency(a, b) {
+    /*jshint noempty: false*/
+    var i = 0;
+    var aMatchRecency = a.match.recency,
+        bMatchRecency = b.match.recency, aLength = aMatchRecency.length - 1, bLength = bMatchRecency.length - 1;
+    while (aMatchRecency[i] === bMatchRecency[i] && i < aLength && i < bLength && i++) {
+    }
+    var ret = aMatchRecency[i] - bMatchRecency[i];
+    if (!ret) {
+        ret = aLength - bLength;
+    }
+    return ret;
+}
+
+function activationRecency(a, b) {
+    return a.recency - b.recency;
+}
+
+var strategies = {
+    salience: salience,
+    bucketCounter: bucketCounter,
+    factRecency: factRecency,
+    activationRecency: activationRecency
+};
+
+exports.strategies = strategies;
+exports.strategy = function (strats) {
+    strats = map(strats, function (s) {
+        return strategies[s];
+    });
+    var stratsLength = strats.length;
+
+    return function (a, b) {
+        var i = -1, ret = 0;
+        var equal = (a === b) || (a.name === b.name && a.hashCode === b.hashCode);
+        if (!equal) {
+            while (++i < stratsLength && !ret) {
+                ret = strats[i](a, b);
+            }
+            ret = ret > 0 ? 1: -1;
+        }
+        return ret;
+    };
+};
+},{"./extended":12}],8:[function(require,module,exports){
 "use strict";
 
 var extd = require("./extended"),
+    deepEqual = extd.deepEqual,
     merge = extd.merge,
     instanceOf = extd.instanceOf,
     filter = extd.filter,
     declare = extd.declare,
     constraintMatcher;
 
+var id = 0;
 var Constraint = declare({
 
     instance: {
@@ -695,6 +693,7 @@ var Constraint = declare({
             if (!constraintMatcher) {
                 constraintMatcher = require("./constraintMatcher");
             }
+            this.id = id++;
             this.type = type;
             this.constraint = constraint;
         },
@@ -849,10 +848,35 @@ Constraint.extend({
     }
 }).as(exports, "HashConstraint");
 
+Constraint.extend({
+    instance: {
+        constructor: function (prop, constraints) {
+            this.type = "from";
+            this.prop = prop;
+            this.constraints = constraints;
+        },
 
+        equal: function (constraint) {
+            return instanceOf(constraint, this._static) && this.get("alias") === constraint.get("alias") && deepEqual(this.constraints, constraint.constraints);
+        },
 
+        "assert": function () {
+            return true;
+        },
 
-},{"./constraintMatcher":8,"./extended":11}],8:[function(require,module,exports){
+        getters: {
+            variables: function () {
+                return this.constraint;
+            }
+        }
+
+    }
+}).as(exports, "FromConstraint");
+
+
+
+
+},{"./constraintMatcher":9,"./extended":12}],9:[function(require,module,exports){
 "use strict";
 
 var extd = require("./extended"),
@@ -1225,9 +1249,10 @@ exports.getIdentifiers = function (constraint) {
 
 
 
-},{"./constraint":7,"./extended":11}],9:[function(require,module,exports){
+},{"./constraint":8,"./extended":12}],10:[function(require,module,exports){
 "use strict";
 var extd = require("./extended"),
+    isBoolean = extd.isBoolean,
     declare = extd.declare,
     merge = extd.merge,
     union = extd.union,
@@ -1294,7 +1319,19 @@ var Context = declare({
         },
 
         isMatch: function (isMatch) {
-            this.match.isMatch = isMatch;
+            if (isBoolean(isMatch)) {
+                this.match.isMatch = isMatch;
+            } else {
+                return this.match.isMatch;
+            }
+            return this;
+        },
+
+        mergeMatch: function (merge) {
+            var match = this.match = this.match.merge(merge);
+            this.factHash = match.factHash;
+            this.hashCode = match.hashCode;
+            this.factIds = match.factIds;
             return this;
         },
 
@@ -1306,7 +1343,7 @@ var Context = declare({
 
 
 
-},{"./extended":11}],10:[function(require,module,exports){
+},{"./extended":12}],11:[function(require,module,exports){
 var extd = require("./extended"),
     Promise = extd.Promise,
     nextTick = require("./nextTick"),
@@ -1411,22 +1448,59 @@ Promise.extend({
         }
     }
 }).as(module);
-},{"./extended":11,"./nextTick":16}],11:[function(require,module,exports){
+},{"./extended":12,"./nextTick":17}],12:[function(require,module,exports){
+var arr = require("array-extended"),
+    map = arr.map;
+
+function plucked(prop) {
+    var exec = prop.match(/(\w+)\(\)$/);
+    if (exec) {
+        prop = exec[1];
+        return function (item) {
+            return item[prop]();
+        };
+    } else {
+        return function (item) {
+            return item[prop];
+        };
+    }
+}
+
+function plucker(prop) {
+    prop = prop.split(".");
+    if (prop.length === 1) {
+        return plucked(prop[0]);
+    } else {
+        var pluckers = map(prop, function (prop) {
+            return plucked(prop);
+        });
+        var l = pluckers.length;
+        return function (item) {
+            var i = -1, res = item;
+            while (++i < l) {
+                res = pluckers[i](res);
+            }
+            return res;
+        };
+    }
+}
+
 module.exports = require("extended")()
-    .register(require("array-extended"))
+    .register(arr)
     .register(require("date-extended"))
     .register(require("object-extended"))
     .register(require("string-extended"))
     .register(require("promise-extended"))
     .register(require("function-extended"))
     .register(require("is-extended"))
+    .register("plucker", plucker)
     .register("HashTable", require("ht"))
     .register("declare", require("declare.js"))
     .register(require("leafy"))
     .register("LinkedList", require("./linkedList"));
 
 
-},{"./linkedList":15,"array-extended":39,"date-extended":40,"declare.js":42,"extended":43,"function-extended":46,"ht":52,"is-extended":53,"leafy":54,"object-extended":55,"promise-extended":56,"string-extended":57}],12:[function(require,module,exports){
+},{"./linkedList":16,"array-extended":42,"date-extended":43,"declare.js":45,"extended":46,"function-extended":49,"ht":55,"is-extended":56,"leafy":57,"object-extended":58,"promise-extended":59,"string-extended":60}],13:[function(require,module,exports){
 "use strict";
 var extd = require("./extended"),
     bind = extd.bind,
@@ -1494,12 +1568,11 @@ module.exports = declare(EventEmitter, {
         // retract followed by an assert.
         modify: function (fact, cb) {
             //fact = this.workingMemory.getFact(fact);
-            this.rootNode.retractFact(this.workingMemory.retractFact(fact));
             if ("function" === typeof cb) {
                 cb.call(fact, fact);
             }
+            this.rootNode.modifyFact(this.workingMemory.modifyFact(fact));
             this.emit("modify", fact);
-            this.rootNode.assertFact(this.workingMemory.assertFact(fact));
             return fact;
         },
 
@@ -1525,7 +1598,7 @@ module.exports = declare(EventEmitter, {
 
     }
 });
-},{"./agenda":3,"./executionStrategy":10,"./extended":11,"./nodes":20,"./workingMemory":37,"events":47}],13:[function(require,module,exports){
+},{"./agenda":3,"./executionStrategy":11,"./extended":12,"./nodes":23,"./workingMemory":40,"events":50}],14:[function(require,module,exports){
 "use strict";
 var extd = require("./extended"),
     instanceOf = extd.instanceOf,
@@ -1626,7 +1699,7 @@ var FlowContainer = declare({
     }
 
 }).as(module);
-},{"./extended":11,"./flow":12,"./pattern":35,"./rule":36}],14:[function(require,module,exports){
+},{"./extended":12,"./flow":13,"./pattern":38,"./rule":39}],15:[function(require,module,exports){
 /**
  *
  * @projectName nools
@@ -1702,7 +1775,7 @@ exports.transpile = function (file, options) {
 };
 
 exports.parse = parse;
-},{"./compile":5,"./extended":11,"./flowContainer":13,"fs":48,"path":49}],15:[function(require,module,exports){
+},{"./compile":5,"./extended":12,"./flowContainer":14,"fs":51,"path":52}],16:[function(require,module,exports){
 var declare = require("declare.js");
 declare({
 
@@ -1737,7 +1810,7 @@ declare({
             } else {
                 this.tail = node.prev;
             }
-            node.data = node.prev = node.next = null;
+            //node.data = node.prev = node.next = null;
             this.length--;
         },
 
@@ -1757,7 +1830,7 @@ declare({
 
 }).as(module);
 
-},{"declare.js":42}],16:[function(require,module,exports){
+},{"declare.js":45}],17:[function(require,module,exports){
 var process=require("__browserify_process");/*global setImmediate, window, MessageChannel*/
 var extd = require("./extended");
 var nextTick;
@@ -1795,7 +1868,7 @@ if (typeof setImmediate === "function") {
 }
 
 module.exports = nextTick;
-},{"./extended":11,"__browserify_process":51}],17:[function(require,module,exports){
+},{"./extended":12,"__browserify_process":54}],18:[function(require,module,exports){
 var AlphaNode = require("./alphaNode");
 
 AlphaNode.extend({
@@ -1814,8 +1887,12 @@ AlphaNode.extend({
             return this.__propagate("assert", context.set(this.alias, context.fact.object));
         },
 
-        retract: function (assertable) {
-            this.propagateRetract(assertable.fact);
+        modify: function (context) {
+            return this.__propagate("modify", context.set(this.alias, context.fact.object));
+        },
+
+        retract: function (context) {
+            return this.__propagate("retract", context.set(this.alias, context.fact.object));
         },
 
         equal: function (other) {
@@ -1823,7 +1900,7 @@ AlphaNode.extend({
         }
     }
 }).as(module);
-},{"./alphaNode":18}],18:[function(require,module,exports){
+},{"./alphaNode":19}],19:[function(require,module,exports){
 "use strict";
 var Node = require("./node");
 
@@ -1843,28 +1920,448 @@ Node.extend({
         }
     }
 }).as(module);
-},{"./node":24}],19:[function(require,module,exports){
+},{"./node":27}],20:[function(require,module,exports){
 var AlphaNode = require("./alphaNode");
 
+function createContextHash(context) {
+    var ret = [],
+        paths = context.paths,
+        i = -1,
+        l = paths.length;
+    while (++i < l) {
+        ret.push(paths[i].id);
+    }
+    ret.push(context.hashCode);
+    return ret.join(":");
+
+}
+
 AlphaNode.extend({
     instance: {
 
         constructor: function () {
+            this.memory = {};
             this._super(arguments);
         },
 
         assert: function (context) {
-            if (this.constraint.assert(context.factHash)) {
+            var hashCode = createContextHash(context);
+            if ((this.memory[hashCode] = this.constraint.assert(context.factHash))) {
                 this.__propagate("assert", context);
             }
         },
 
+        modify: function (context) {
+            var memory = this.memory,
+                hashCode = createContextHash(context),
+                wasMatch = memory[hashCode];
+            if ((memory[hashCode] = this.constraint.assert(context.factHash))) {
+                this.__propagate(wasMatch ? "modify": "assert", context);
+            } else if (wasMatch) {
+                this.__propagate("retract", context);
+            }
+        },
+
+        retract: function (context) {
+            var hashCode = createContextHash(context),
+                memory = this.memory;
+            if (memory[hashCode]) {
+                this.__propagate("retract", context);
+            }
+            memory[hashCode] = null;
+        },
+
         toString: function () {
             return "EqualityNode" + this.__count;
         }
     }
 }).as(module);
-},{"./alphaNode":18}],20:[function(require,module,exports){
+},{"./alphaNode":19}],21:[function(require,module,exports){
+var Node = require("./joinNode"),
+    extd = require("../extended"),
+    constraint = require("../constraint"),
+    EqualityConstraint = constraint.EqualityConstraint,
+    HashConstraint = constraint.HashConstraint,
+    ReferenceConstraint = constraint.ReferenceConstraint,
+    Context = require("../context"),
+    plucker = extd.plucker,
+    isEmpty = extd.isEmpty,
+    forEach = extd.forEach,
+    isArray = extd.isArray;
+
+var DEFAULT_MATCH = {
+    isMatch: function () {
+        return false;
+    }
+};
+
+
+Node.extend({
+    instance: {
+
+        constructor: function (pattern, wm) {
+            this._super(arguments);
+            this.workingMemory = wm;
+            this.fromMemory = {};
+            this.pattern = pattern;
+            this.type = pattern.get("constraints")[0];
+            this.alias = pattern.get("alias");
+            this.plucker = plucker(this.from = pattern.from);
+            var eqConstraints = this.__equalityConstraints = [];
+            var vars = [];
+            forEach(this.constraints = this.pattern.get("constraints").slice(1), function (c) {
+                if (c instanceof EqualityConstraint || c instanceof ReferenceConstraint) {
+                    eqConstraints.push(c);
+                } else if (c instanceof HashConstraint) {
+                    vars = vars.concat(c.get("variables"));
+                }
+            });
+            this.__variables = vars;
+        },
+
+        __createMatches: function (context) {
+            var fh = context.factHash, o = this.plucker(fh);
+            if (isArray(o)) {
+                for (var i = 0, l = o.length; i < l; i++) {
+                    this.__checkMatch(context, o[i], true);
+                }
+            } else {
+                this.__checkMatch(context, o, true);
+            }
+        },
+
+        __checkMatch: function (context, o, propogate) {
+            var newContext;
+            if ((newContext = this.__createMatch(context, o)).isMatch() && propogate) {
+                this.__propagate("assert", newContext.clone());
+            }
+            return newContext;
+        },
+
+        __createMatch: function (lc, o) {
+            if (this.type.assert(o)) {
+                var createdFact = this.workingMemory.getFactHandle(o, true),
+                    createdContext,
+                    rc = new Context(createdFact)
+                        .set(this.alias, o),
+                    createdFactId = createdFact.id;
+                var fh = rc.factHash, lcFh = lc.factHash;
+                for (var key in lcFh) {
+                    fh[key] = lcFh[key];
+                }
+                var eqConstraints = this.__equalityConstraints, vars = this.__variables, i = -1, l = eqConstraints.length;
+                while (++i < l) {
+                    if (!eqConstraints[i].assert(fh)) {
+                        createdContext = DEFAULT_MATCH;
+                        break;
+                    }
+                }
+                var fm = this.fromMemory[createdFactId];
+                if (!fm) {
+                    fm = this.fromMemory[createdFactId] = {};
+                }
+                if (!createdContext) {
+                    var prop;
+                    i = -1;
+                    l = vars.length;
+                    while (++i < l) {
+                        prop = vars[i];
+                        fh[prop] = o[prop];
+                    }
+                    lc.fromMatches[createdFact.id] = createdContext = rc.clone(createdFact, null, lc.match.merge(rc.match));
+                }
+                fm[lc.hashCode] = [lc, createdContext];
+                return createdContext;
+            }
+            return DEFAULT_MATCH;
+        },
+
+        retractRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+        removeFromFromMemory: function (context) {
+            var factId = context.fact.id;
+            var fm = this.fromMemory[factId];
+            if (fm) {
+                var entry;
+                for (var i in fm) {
+                    entry = fm[i];
+                    if (entry[1] === context) {
+                        delete fm[i];
+                        if (isEmpty(fm)) {
+                            delete this.fromMemory[factId];
+                        }
+                        break;
+                    }
+                }
+            }
+
+        },
+
+        retractLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                ctx = ctx.data;
+                var fromMatches = ctx.fromMatches;
+                for (var i in fromMatches) {
+                    this.removeFromFromMemory(fromMatches[i]);
+                    this.__propagate("retract", fromMatches[i].clone());
+                }
+            }
+        },
+
+        modifyLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context), newContext, i, l, factId, fact;
+            if (ctx) {
+                this.__addToLeftMemory(context);
+
+                var leftContext = ctx.data,
+                    fromMatches = (context.fromMatches = {}),
+                    rightMatches = leftContext.fromMatches,
+                    o = this.plucker(context.factHash);
+
+                if (isArray(o)) {
+                    for (i = 0, l = o.length; i < l; i++) {
+                        newContext = this.__checkMatch(context, o[i], false);
+                        if (newContext.isMatch()) {
+                            factId = newContext.fact.id;
+                            if (factId in rightMatches) {
+                                this.__propagate("modify", newContext.clone());
+                            } else {
+                                this.__propagate("assert", newContext.clone());
+                            }
+                        }
+                    }
+                } else {
+                    newContext = this.__checkMatch(context, o, false);
+                    if (newContext.isMatch()) {
+                        factId = newContext.fact.id;
+                        if (factId in rightMatches) {
+                            this.__propagate("modify", newContext.clone());
+                        } else {
+                            this.__propagate("assert", newContext.clone());
+                        }
+                    }
+                }
+                for (i in rightMatches) {
+                    if (!(i in fromMatches)) {
+                        this.removeFromFromMemory(rightMatches[i]);
+                        this.__propagate("retract", rightMatches[i].clone());
+                    }
+                }
+            } else {
+                this.assertLeft(context);
+            }
+            fact = context.fact;
+            factId = fact.id;
+            var fm = this.fromMemory[factId];
+            this.fromMemory[factId] = {};
+            if (fm) {
+                var lc, entry, cc, createdIsMatch, factObject = fact.object;
+                for (i in fm) {
+                    entry = fm[i];
+                    lc = entry[0];
+                    cc = entry[1];
+                    createdIsMatch = cc.isMatch();
+                    if (lc.hashCode !== context.hashCode) {
+                        newContext = this.__createMatch(lc, factObject, false);
+                        if (createdIsMatch) {
+                            this.__propagate("retract", cc.clone());
+                        }
+                        if (newContext.isMatch()) {
+                            this.__propagate(createdIsMatch ? "modify": "assert", newContext.clone());
+                        }
+
+                    }
+                }
+            }
+        },
+
+        assertLeft: function (context) {
+            this.__addToLeftMemory(context);
+            context.fromMatches = {};
+            this.__createMatches(context);
+        },
+
+        assertRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+
+        toString: function () {
+            return "FromNode" + this.__count;
+        }
+
+    }
+}).as(module);
+},{"../constraint":8,"../context":10,"../extended":12,"./joinNode":24}],22:[function(require,module,exports){
+var Node = require("./joinNode"),
+    extd = require("../extended"),
+    constraint = require("../constraint"),
+    EqualityConstraint = constraint.EqualityConstraint,
+    HashConstraint = constraint.HashConstraint,
+    ReferenceConstraint = constraint.ReferenceConstraint,
+    Context = require("../context"),
+    plucker = extd.plucker,
+    forEach = extd.forEach,
+    isArray = extd.isArray;
+
+Node.extend({
+    instance: {
+
+        constructor: function (pattern, workingMemory) {
+            this._super(arguments);
+            this.workingMemory = workingMemory;
+            this.pattern = pattern;
+            this.type = pattern.get("constraints")[0];
+            this.alias = pattern.get("alias");
+            this.plucker = plucker(this.from = pattern.from);
+            this.fromMemory = {};
+            var eqConstraints = this.__equalityConstraints = [];
+            var vars = [];
+            forEach(this.constraints = this.pattern.get("constraints").slice(1), function (c) {
+                if (c instanceof EqualityConstraint || c instanceof ReferenceConstraint) {
+                    eqConstraints.push(c);
+                } else if (c instanceof HashConstraint) {
+                    vars = vars.concat(c.get("variables"));
+                }
+            });
+            this.__variables = vars;
+
+        },
+
+        retractLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                ctx = ctx.data;
+                if (!ctx.blocked) {
+                    this.__propagate("retract", ctx.clone());
+                }
+            }
+        },
+
+        __modify: function (context, leftContext) {
+            var leftContextBlocked = leftContext.blocked;
+            var fh = context.factHash, o = this.plucker(fh);
+            if (isArray(o)) {
+                for (var i = 0, l = o.length; i < l; i++) {
+                    if (this.__isMatch(context, o[i], true)) {
+                        context.blocked = true;
+                        break;
+                    }
+                }
+            } else {
+                context.blocked = this.__isMatch(context, o, true);
+            }
+            var newContextBlocked = context.blocked;
+            if (!newContextBlocked) {
+                if (leftContextBlocked) {
+                    this.__propagate("assert", context.clone());
+                } else {
+                    this.__propagate("modify", context.clone());
+                }
+            } else if (!leftContextBlocked) {
+                this.__propagate("retract", leftContext.clone());
+            }
+
+        },
+
+        modifyLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                this.__addToLeftMemory(context);
+                this.__modify(context, ctx.data);
+            } else {
+                throw new Error();
+            }
+            var fm = this.fromMemory[context.fact.id];
+            this.fromMemory[context.fact.id] = {};
+            if (fm) {
+                for (var i in fm) {
+                    // update any contexts associated with this fact
+                    if (i !== context.hashCode) {
+                        var lc = fm[i];
+                        ctx = this.removeFromLeftMemory(lc);
+                        if (ctx) {
+                            lc = lc.clone();
+                            lc.blocked = false;
+                            this.__addToLeftMemory(lc);
+                            this.__modify(lc, ctx.data);
+                        }
+                    }
+                }
+            }
+        },
+
+        __findMatches: function (context) {
+            var fh = context.factHash, o = this.plucker(fh), isMatch = false;
+            if (isArray(o)) {
+                for (var i = 0, l = o.length; i < l; i++) {
+                    if (this.__isMatch(context, o[i], true)) {
+                        context.blocked = true;
+                        return;
+                    }
+                }
+                this.__propagate("assert", context.clone());
+            } else if (!(context.blocked = this.__isMatch(context, o, true))) {
+                this.__propagate("assert", context.clone());
+            }
+            return isMatch;
+        },
+
+        __isMatch: function (oc, o, add) {
+            var ret = false;
+            if (this.type.assert(o)) {
+                var createdFact = this.workingMemory.getFactHandle(o);
+                var context = new Context(createdFact, null)
+                    .mergeMatch(oc.match)
+                    .set(this.alias, o);
+                if (add) {
+                    var fm = this.fromMemory[createdFact.id];
+                    if (!fm) {
+                        fm = this.fromMemory[createdFact.id] = {};
+                    }
+                    fm[oc.hashCode] = oc;
+                }
+                var fh = context.factHash;
+                var eqConstraints = this.__equalityConstraints;
+                for (var i = 0, l = eqConstraints.length; i < l; i++) {
+                    if (eqConstraints[i].assert(fh)) {
+                        ret = true;
+                    } else {
+                        ret = false;
+                        break;
+                    }
+                }
+            }
+            return ret;
+        },
+
+        removeFromLeftMemory: function () {
+            return this._super(arguments);
+        },
+
+        assertLeft: function (context) {
+            this.__addToLeftMemory(context);
+            this.__findMatches(context);
+        },
+
+        assertRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+        retractRight: function () {
+            throw new Error("Shouldnt have gotten here");
+        },
+
+        toString: function () {
+            return "FromNode" + this.__count;
+        }
+
+    }
+}).as(module);
+},{"../constraint":8,"../context":10,"../extended":12,"./joinNode":24}],23:[function(require,module,exports){
 "use strict";
 var extd = require("../extended"),
     forEach = extd.forEach,
@@ -1872,6 +2369,8 @@ var extd = require("../extended"),
     declare = extd.declare,
     pattern = require("../pattern.js"),
     ObjectPattern = pattern.ObjectPattern,
+    FromPattern = pattern.FromPattern,
+    FromNotPattern = pattern.FromNotPattern,
     NotPattern = pattern.NotPattern,
     CompositePattern = pattern.CompositePattern,
     InitialFactPattern = pattern.InitialFactPattern,
@@ -1882,6 +2381,8 @@ var extd = require("../extended"),
     EqualityNode = require("./equalityNode"),
     JoinNode = require("./joinNode"),
     NotNode = require("./notNode"),
+    FromNode = require("./fromNode"),
+    FromNotNode = require("./fromNotNode"),
     LeftAdapterNode = require("./leftAdapterNode"),
     RightAdapterNode = require("./rightAdapterNode"),
     TypeNode = require("./typeNode"),
@@ -1902,6 +2403,7 @@ declare({
                 recency: 0
             };
             this.agendaTree = agendaTree;
+            this.workingMemory = wm;
         },
 
         assertRule: function (rule) {
@@ -1933,6 +2435,13 @@ declare({
             }
         },
 
+        modifyFact: function (fact) {
+            var typeNodes = this.typeNodes, i = typeNodes.length - 1;
+            for (; i >= 0; i--) {
+                typeNodes[i].modify(fact);
+            }
+        },
+
 
         containsRule: function (name) {
             return some(this.terminalNodes, function (n) {
@@ -1996,17 +2505,22 @@ declare({
         },
 
         __createAdapterNode: function (rule, side) {
-            return (side === "left" ? new LeftAdapterNode() : new RightAdapterNode()).addRule(rule);
+            return (side === "left" ? new LeftAdapterNode(): new RightAdapterNode()).addRule(rule);
         },
 
         __createJoinNode: function (rule, pattern, outNode, side) {
             var joinNode;
             if (pattern.rightPattern instanceof NotPattern) {
                 joinNode = new NotNode();
+            } else if (pattern.rightPattern instanceof FromNotPattern) {
+                joinNode = new FromNotNode(pattern.rightPattern, this.workingMemory);
+            } else if (pattern.rightPattern instanceof FromPattern) {
+                joinNode = new FromNode(pattern.rightPattern, this.workingMemory);
             } else {
                 joinNode = new JoinNode();
                 this.joinNodes.push(joinNode);
             }
+            joinNode["__rule__"] = rule;
             var parentNode = joinNode;
             if (outNode instanceof JoinNode) {
                 var adapterNode = this.__createAdapterNode(rule, side);
@@ -2019,10 +2533,15 @@ declare({
 
         __addToNetwork: function (rule, pattern, outNode, side) {
             if (pattern instanceof ObjectPattern) {
-                if (pattern instanceof NotPattern && (!side || side === "left")) {
-                    return this.__createBetaNode(rule, new CompositePattern(new InitialFactPattern(), pattern), outNode, side);
+                if ((pattern instanceof NotPattern || pattern instanceof FromPattern || pattern instanceof FromNotPattern) && (!side || side === "left")) {
+                    if (pattern instanceof FromNotPattern) {
+                        this.__createBetaNode(rule, new CompositePattern(new InitialFactPattern(), pattern), outNode, side);
+                    } else {
+                        this.__createBetaNode(rule, new CompositePattern(new InitialFactPattern(), pattern), outNode, side);
+                    }
+                } else {
+                    this.__createAlphaNode(rule, pattern, outNode, side);
                 }
-                this.__createAlphaNode(rule, pattern, outNode, side);
             } else if (pattern instanceof CompositePattern) {
                 this.__createBetaNode(rule, pattern, outNode, side);
             }
@@ -2038,36 +2557,41 @@ declare({
 
 
         __createAlphaNode: function (rule, pattern, outNode, side) {
-            var constraints = pattern.get("constraints");
-            var typeNode = this.__createTypeNode(rule, pattern);
-            var aliasNode = this.__createAliasNode(rule, pattern);
-            typeNode.addOutNode(aliasNode, pattern);
-            aliasNode.addParentNode(typeNode);
-            var parentNode = aliasNode;
-            var i = constraints.length - 1;
-            for (; i > 0; i--) {
-                var constraint = constraints[i], node;
-                if (constraint instanceof HashConstraint) {
-                    node = this.__createPropertyNode(rule, constraint);
-                } else if (constraint instanceof ReferenceConstraint) {
-                    outNode.constraint.addConstraint(constraint);
-                    continue;
-                } else {
-                    node = this.__createEqualityNode(rule, constraint);
+            var typeNode, parentNode;
+            if (!(pattern instanceof FromPattern)) {
+
+                var constraints = pattern.get("constraints");
+                typeNode = this.__createTypeNode(rule, pattern);
+                var aliasNode = this.__createAliasNode(rule, pattern);
+                typeNode.addOutNode(aliasNode, pattern);
+                aliasNode.addParentNode(typeNode);
+                parentNode = aliasNode;
+                var i = constraints.length - 1;
+                for (; i > 0; i--) {
+                    var constraint = constraints[i], node;
+                    if (constraint instanceof HashConstraint) {
+                        node = this.__createPropertyNode(rule, constraint);
+                    } else if (constraint instanceof ReferenceConstraint) {
+                        outNode.constraint.addConstraint(constraint);
+                        continue;
+                    } else {
+                        node = this.__createEqualityNode(rule, constraint);
+                    }
+                    parentNode.addOutNode(node, pattern);
+                    node.addParentNode(parentNode);
+                    parentNode = node;
                 }
-                parentNode.addOutNode(node, pattern);
-                node.addParentNode(parentNode);
-                parentNode = node;
-            }
-            if (outNode instanceof JoinNode) {
-                var adapterNode = this.__createAdapterNode(rule, side);
-                adapterNode.addParentNode(parentNode);
-                parentNode.addOutNode(adapterNode, pattern);
-                parentNode = adapterNode;
+
+                if (outNode instanceof JoinNode) {
+                    var adapterNode = this.__createAdapterNode(rule, side);
+                    adapterNode.addParentNode(parentNode);
+                    parentNode.addOutNode(adapterNode, pattern);
+                    parentNode = adapterNode;
+                }
+                outNode.addParentNode(parentNode);
+                parentNode.addOutNode(outNode, pattern);
+                return typeNode;
             }
-            outNode.addParentNode(parentNode);
-            parentNode.addOutNode(outNode, pattern);
-            return typeNode;
         },
 
         print: function () {
@@ -2083,12 +2607,12 @@ declare({
 
 
 
-},{"../constraint":7,"../extended":11,"../pattern.js":35,"./aliasNode":17,"./equalityNode":19,"./joinNode":21,"./leftAdapterNode":23,"./notNode":25,"./propertyNode":26,"./rightAdapterNode":27,"./terminalNode":28,"./typeNode":29}],21:[function(require,module,exports){
+},{"../constraint":8,"../extended":12,"../pattern.js":38,"./aliasNode":18,"./equalityNode":20,"./fromNode":21,"./fromNotNode":22,"./joinNode":24,"./leftAdapterNode":26,"./notNode":28,"./propertyNode":29,"./rightAdapterNode":30,"./terminalNode":31,"./typeNode":32}],24:[function(require,module,exports){
 var extd = require("../extended"),
     values = extd.hash.values,
-    indexOf = extd.indexOf,
     Node = require("./node"),
-    JoinReferenceNode = require("./joinReferenceNode");
+    JoinReferenceNode = require("./joinReferenceNode"),
+    LinkedList = require("../linkedList");
 
 Node.extend({
 
@@ -2098,22 +2622,26 @@ Node.extend({
             this.constraint = new JoinReferenceNode();
             this.leftMemory = {};
             this.rightMemory = {};
-            this.leftTuples = [];
-            this.rightTuples = [];
+            this.leftTuples = new LinkedList();
+            this.rightTuples = new LinkedList();
         },
 
         dispose: function () {
             this.leftMemory = {};
             this.rightMemory = {};
+            this.leftTuples.clear();
+            this.rightTuples.clear();
         },
 
         disposeLeft: function (fact) {
             this.leftMemory = {};
+            this.leftTuples.clear();
             this.propagateDispose(fact);
         },
 
         disposeRight: function (fact) {
             this.rightMemory = {};
+            this.rightTuples.clear();
             this.propagateDispose(fact);
         },
 
@@ -2125,111 +2653,263 @@ Node.extend({
             return "JoinNode " + this.__count;
         },
 
-        retractResolve: function (match) {
-            var es = values(this.leftMemory), j = es.length, leftTuples = this.leftTuples;
-            while (--j > -1) {
-                var contexts = es[j], i = contexts.length, context;
-                while (--i > -1) {
-                    context = contexts[i];
-                    if (this.resolve(context.match, match)) {
-                        leftTuples.splice(indexOf(leftTuples, context), 1);
-                        contexts.splice(i, 1);
-                        break;
-                    }
+        retractLeft: function (context) {
+            context = this.removeFromLeftMemory(context);
+            if (context) {
+                context = context.data;
+                var rightMathces = values(context.rightMatches),
+                    i = -1,
+                    l = rightMathces.length;
+                while (++i < l) {
+                    this.__propagate("retract", rightMathces[i]);
                 }
+            }else{
+                throw new Error();
             }
-            this._propagateRetractResolve(match);
+            return this;
         },
 
-        retractLeft: function (fact) {
-            var contexts = this.leftMemory[fact.id], tuples = this.leftTuples, i, l;
-            if (contexts) {
-                i = -1;
-                l = contexts.length;
+        retractRight: function (context) {
+            context = this.removeFromRightMemory(context);
+            if (context) {
+                context = context.data;
+                var leftMatches = values(context.leftMatches),
+                    i = -1,
+                    l = leftMatches.length;
                 while (++i < l) {
-                    tuples.splice(indexOf(tuples, contexts[i]), 1);
+                    this.__propagate("retract", leftMatches[i]);
+                }
+            }else{
+                throw new Error();
+            }
+            return this;
+        },
+
+        propagateFromLeft: function (context, constraint, rm) {
+            var mr;
+            if ((mr = constraint.setRightContext(rm).match()).isMatch) {
+                this.__propagate("assert", this.__addToMemoryMatches(rm, context, context.clone(null, null, mr)));
+            }
+            return this;
+        },
+
+        propagateFromRight: function (context, constraint, lm) {
+            var mr;
+            if ((mr = constraint.setLeftContext(lm).match()).isMatch) {
+                this.__propagate("assert", this.__addToMemoryMatches(context, lm, context.clone(null, null, mr)));
+            }
+            return this;
+        },
+
+        assertLeft: function (context) {
+            if (this.__addToLeftMemory(context)) {
+                var rm = this.rightTuples, node = {next: rm.head}, thisConstraint = this.constraint;
+                if (rm.length) {
+                    thisConstraint.setLeftContext(context);
+                    while ((node = node.next)) {
+                        this.propagateFromLeft(context, thisConstraint, node.data);
+                    }
+                    thisConstraint.clearContexts();
+                }
+            } else {
+                this.modifyLeft(context);
+            }
+        },
+
+        assertRight: function (context) {
+            if (this.__addToRightMemory(context)) {
+                var lm = this.leftTuples;
+                if (lm.length) {
+                    var node = {next: lm.head}, thisConstraint = this.constraint;
+                    thisConstraint.setRightContext(context);
+                    while ((node = node.next)) {
+                        this.propagateFromRight(context, thisConstraint, node.data);
+                    }
+                    thisConstraint.clearContexts();
                 }
-                delete this.leftMemory[fact.id];
             } else {
-                var tuple;
-                for (i = 0; i < tuples.length; i++) {
-                    tuple = tuples[i];
-                    if (indexOf(tuple.factIds, fact.id) !== -1) {
-                        tuples.splice(i, 1);
+                this.modifyRight(context);
+            }
+        },
+
+        modifyLeft: function (context) {
+            var previousContext;
+            if ((previousContext = this.removeFromLeftMemory(context))) {
+                previousContext = previousContext.data;
+                this.__addToLeftMemory(context);
+                var rm = this.rightTuples, l = rm.length;
+                if (!l) {
+                    this.propagateRetract(context);
+                } else {
+                    var thisConstraint = this.constraint,
+                        node = {next: rm.head},
+                        rightMatches = previousContext.rightMatches;
+                    thisConstraint.setLeftContext(context);
+                    while ((node = node.next)) {
+                        this.propagateAssertModifyFromLeft(context, rightMatches, thisConstraint, node.data);
                     }
+                    thisConstraint.clearContexts();
+
+                }
+            } else {
+                throw new Error();
+            }
+
+        },
+
+        modifyRight: function (context) {
+            var previousContext;
+            if ((previousContext = this.removeFromRightMemory(context))) {
+                previousContext = previousContext.data;
+                this.__addToRightMemory(context);
+                var lm = this.leftTuples;
+                if (!lm.length) {
+                    this.propagateRetract(context);
+                } else {
+                    var thisConstraint = this.constraint,
+                        leftMatches = previousContext.leftMatches,
+                        node = {next: lm.head};
+                    thisConstraint.setRightContext(context);
+                    while ((node = node.next)) {
+                        this.propagateAssertModifyFromRight(context, leftMatches, thisConstraint, node.data);
+                    }
+                    thisConstraint.clearContexts();
+                }
+            }  else {
+                throw new Error();
+            }
+
+        },
+
+        propagateAssertModifyFromLeft: function (context, rightMatches, constraint, rm) {
+            var factId = rm.hashCode, mr;
+            if (factId in rightMatches) {
+                mr = constraint.setRightContext(rm).match();
+                var mrIsMatch = mr.isMatch;
+                if (!mrIsMatch) {
+                    this.__propagate("retract", rightMatches[factId].clone());
+                } else {
+                    this.__propagate("modify", this.__addToMemoryMatches(rm, context, context.clone(null, null, mr)));
+                }
+            } else {
+                this.propagateFromLeft(context, constraint, rm);
+            }
+        },
+
+        propagateAssertModifyFromRight: function (context, leftMatches, constraint, lm) {
+            var factId = lm.hashCode, mr;
+            if (factId in leftMatches) {
+                mr = constraint.setLeftContext(lm).match();
+                var mrIsMatch = mr.isMatch;
+                if (!mrIsMatch) {
+                    this.__propagate("retract", leftMatches[factId].clone());
+                } else {
+                    this.__propagate("modify", this.__addToMemoryMatches(context, lm, context.clone(null, null, mr)));
+                }
+            } else {
+                this.propagateFromRight(context, constraint, lm);
+            }
+        },
+
+        removeFromRightMemory: function (context) {
+            var hashCode = context.hashCode, ret;
+            context = this.rightMemory[hashCode] || null;
+            var tuples = this.rightTuples;
+            if (context) {
+                var leftMemory = this.leftMemory;
+                ret = context.data;
+                var leftMatches = ret.leftMatches;
+                tuples.remove(context);
+                for (var i in leftMatches) {
+                    delete leftMemory[i].data.rightMatches[hashCode];
                 }
+                delete this.rightMemory[hashCode];
             }
-            this.propagateRetract(fact);
+            return context;
         },
 
-        retractRight: function (fact) {
-            var context = this.rightMemory[fact.id], tuples = this.rightTuples;
+        removeFromLeftMemory: function (context) {
+            var hashCode = context.hashCode;
+            context = this.leftMemory[hashCode] || null;
             if (context) {
-                tuples.splice(indexOf(tuples, context), 1);
-                delete this.rightMemory[fact.id];
-            } else {
-                var tuple;
-                for (var i = 0; i < tuples.length; i++) {
-                    tuple = tuples[i];
-                    if (indexOf(tuple.factIds, fact.id) !== -1) {
-                        tuples.splice(i, 1);
-                    }
+                var rightMemory = this.rightMemory;
+                var rightMatches = context.data.rightMatches;
+                this.leftTuples.remove(context);
+                for (var i in rightMatches) {
+                    delete rightMemory[i].data.leftMatches[hashCode];
                 }
+                delete this.leftMemory[hashCode];
             }
-            this.propagateRetract(fact);
+            return context;
         },
 
-        assertLeft: function (context) {
-            this.__addToLeftMemory(context);
-            var rm = this.rightTuples, i = -1, l = rm.length, thisConstraint = this.constraint, mr;
-            thisConstraint.setLeftContext(context);
-            while (++i < l) {
-                if ((mr = thisConstraint.setRightContext(rm[i]).match()).isMatch) {
-                    this.__propagate("assert", context.clone(null, null, mr));
-                }
+        getRightMemoryMatches: function (context) {
+            var lm = this.leftMemory[context.hashCode], ret = {};
+            if (lm) {
+                ret = lm.rightMatches;
             }
-            thisConstraint.clearContexts();
+            return ret;
         },
 
-        assertRight: function (context) {
-            var fact = context.fact;
-            this.rightMemory[fact.id] = context;
-            this.rightTuples.push(context);
-            var fl = this.leftTuples, i = -1, l = fl.length, thisConstraint = this.constraint, mr;
-            thisConstraint.setRightContext(context);
-            while (++i < l) {
-                if ((mr = thisConstraint.setLeftContext(fl[i]).match()).isMatch) {
-                    this.__propagate("assert", context.clone(null, null, mr));
+        __addToMemoryMatches: function (rightContext, leftContext, createdContext) {
+            var rightFactId = rightContext.hashCode,
+                rm = this.rightMemory[rightFactId],
+                lm, leftFactId = leftContext.hashCode;
+            if (rm) {
+                rm = rm.data;
+                if (leftFactId in rm.leftMatches) {
+                    throw new Error("Duplicate left fact entry");
+                }
+                rm.leftMatches[leftFactId] = createdContext;
+            }
+            lm = this.leftMemory[leftFactId];
+            if (lm) {
+                lm = lm.data;
+                if (rightFactId in lm.rightMatches) {
+                    throw new Error("Duplicate right fact entry");
                 }
+                lm.rightMatches[rightFactId] = createdContext;
             }
-            thisConstraint.clearContexts();
+            return createdContext;
         },
 
-        _propagateRetractResolve: function (context) {
-            this.__propagate("retractResolve", context);
+        __addToRightMemory: function (context) {
+            var hashCode = context.hashCode, rm = this.rightMemory;
+            if (hashCode in rm) {
+                return false;
+            }
+            rm[hashCode] = this.rightTuples.push(context);
+            context.leftMatches = {};
+            return true;
         },
 
+
         __addToLeftMemory: function (context) {
-            var o = context.fact;
-            var lm = this.leftMemory[o.id];
-            if (!lm) {
-                lm = [];
-                this.leftMemory[o.id] = lm;
-            }
-            this.leftTuples.push(context);
-            lm.push(context);
-            return this;
+            var hashCode = context.hashCode, lm = this.leftMemory;
+            if (hashCode in lm) {
+                return false;
+            }
+            lm[hashCode] = this.leftTuples.push(context);
+            context.rightMatches = {};
+            return true;
         }
     }
 
 }).as(module);
-},{"../extended":11,"./joinReferenceNode":22,"./node":24}],22:[function(require,module,exports){
+},{"../extended":12,"../linkedList":16,"./joinReferenceNode":25,"./node":27}],25:[function(require,module,exports){
 var Node = require("./node");
+
+var DEFUALT_CONSTRAINT = {
+    assert: function () {
+        return true;
+    }
+};
+
 Node.extend({
 
     instance: {
 
-        constraint: null,
+        constraint: DEFUALT_CONSTRAINT,
         __lc: null,
         __rc: null,
         __varLength: 0,
@@ -2277,12 +2957,12 @@ Node.extend({
         clearLeftContext: function () {
             this.__lc = null;
             var fh = this.__fh = {}, rc = this.__rc;
-            fh[this.__alias] = rc ? rc.fact.object : null;
+            fh[this.__alias] = rc ? rc.fact.object: null;
             return this;
         },
 
         addConstraint: function (constraint) {
-            if (this.constraint === null) {
+            if (this.constraint === DEFUALT_CONSTRAINT) {
                 this.constraint = constraint;
             } else {
                 this.constraint = this.constraint.merge(constraint);
@@ -2292,17 +2972,13 @@ Node.extend({
         },
 
         equal: function (constraint) {
-            if (this.constraint !== null) {
+            if (this.constraint !== DEFUALT_CONSTRAINT) {
                 return this.constraint.equal(constraint.constraint);
             }
         },
 
         isMatch: function () {
-            var constraint = this.constraint, ret = true;
-            if (constraint !== null) {
-                ret = constraint.assert(this.__fh);
-            }
-            return ret;
+            return this.constraint.assert(this.__fh);
         },
 
         match: function () {
@@ -2321,7 +2997,7 @@ Node.extend({
     }
 
 }).as(module);
-},{"./node":24}],23:[function(require,module,exports){
+},{"./node":27}],26:[function(require,module,exports){
 var Node = require("./node");
 
 Node.extend({
@@ -2338,7 +3014,7 @@ Node.extend({
             this.__propagate("retractResolve", context);
         },
 
-        modify: function (context) {
+        propagateModify: function (context) {
             this.__propagate("modifyLeft", context);
         },
 
@@ -2356,7 +3032,7 @@ Node.extend({
     }
 
 }).as(module);
-},{"./node":24}],24:[function(require,module,exports){
+},{"./node":27}],27:[function(require,module,exports){
 var extd = require("../extended"),
     forEach = extd.forEach,
     indexOf = extd.indexOf,
@@ -2429,8 +3105,7 @@ declare({
             return false;
         },
 
-        __propagate: function (method, context, outNodes) {
-            outNodes = outNodes || this.nodes;
+        __propagate: function (method, context) {
             var entrySet = this.__entrySet, i = entrySet.length, entry, outNode, paths, continuingPaths;
             while (--i > -1) {
                 entry = entrySet[i];
@@ -2463,30 +3138,32 @@ declare({
             }
         },
 
-        propagateAssert: function (assertable, outNodes) {
-            this.__propagate("assert", assertable, outNodes || this.nodes);
+        propagateAssert: function (assertable) {
+            this.__propagate("assert", assertable);
         },
 
-        propagateRetract: function (assertable, outNodes) {
-            this.__propagate("retract", assertable, outNodes || this.nodes);
+        propagateRetract: function (assertable) {
+            this.__propagate("retract", assertable);
         },
 
         assert: function (assertable) {
             this.propagateAssert(assertable);
         },
 
-        propagateModify: function (assertable, outNodes) {
-            this.__propagate("modify", assertable, outNodes || this.nodes);
+        modify: function (assertable) {
+            this.propagateModify(assertable);
+        },
+
+        propagateModify: function (assertable) {
+            this.__propagate("modify", assertable);
         }
     }
 
 }).as(module);
 
-},{"../context":9,"../extended":11}],25:[function(require,module,exports){
+},{"../context":10,"../extended":12}],28:[function(require,module,exports){
 var JoinNode = require("./joinNode"),
-    Context = require("../context"),
-    extd = require("../extended"),
-    indexOf = extd.indexOf;
+    LinkedList = require("../linkedList");
 
 JoinNode.extend({
     instance: {
@@ -2494,7 +3171,6 @@ JoinNode.extend({
         constructor: function () {
             this._super(arguments);
             this.leftTupleMemory = {};
-            this.allTuples = {};
         },
 
 
@@ -2503,171 +3179,261 @@ JoinNode.extend({
         },
 
 
-        retractRight: function (fact) {
-            var rightMemory = this.rightMemory;
-            var rightContext = rightMemory[fact.id], thisConstraint = this.constraint;
-            delete rightMemory[fact.id];
-            if (rightContext) {
-                var index = indexOf(this.rightTuples, rightContext);
-                this.rightTuples.splice(index, 1);
-                var fl = rightContext.blocking, leftContext;
-                var rValues = this.rightTuples, k = rValues.length, rc, j;
-                while ((leftContext = fl.pop())) {
-                    leftContext.blocker = null;
-                    thisConstraint.setLeftContext(leftContext);
-                    for (j = index; j < k; j++) {
-                        rc = rValues[j];
-                        thisConstraint.setRightContext(rc);
-                        if (thisConstraint.isMatch()) {
-                            leftContext.blocker = rc;
-                            rc.blocking.push(leftContext);
-                            this.__addToLeftTupleMemory(leftContext);
-                            break;
+        retractRight: function (context) {
+            var ctx = this.removeFromRightMemory(context);
+            if (ctx) {
+                var rightContext = ctx.data;
+                var blocking = rightContext.blocking;
+                if (blocking.length) {
+                    //if we are blocking left contexts
+                    var leftContext, rightTuples = this.rightTuples, thisConstraint = this.constraint, blockingNode = {next: blocking.head}, node, l = rightTuples.length, rc;
+                    while ((blockingNode = blockingNode.next)) {
+                        leftContext = blockingNode.data;
+                        this.removeFromLeftBlockedMemory(leftContext);
+                        if (l !== 0) {
+                            thisConstraint.setLeftContext(leftContext);
+                            node = ctx;
+                            while ((node = node.next)) {
+                                if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
+                                    leftContext.blocker = rc;
+                                    this.addToLeftBlockedMemory(rc.blocking.push(leftContext));
+                                    leftContext = null;
+                                    break;
+                                }
+                            }
+                            thisConstraint.clearContexts();
+                        }
+                        if (leftContext) {
+                            this.__addToLeftMemory(leftContext);
+                            this.__propagate("assert", leftContext.clone());
                         }
                     }
-                    if (!leftContext.blocker) {
-                        this.__removeFromLeftTupleMemory(leftContext);
-                        this.__addToLeftMemory(leftContext).propagateAssert(new Context(leftContext.fact, null, leftContext.match));
-                    }
+                    blocking.clear();
                 }
-                thisConstraint.clearContexts();
+            } else {
+                throw new Error();
             }
+
         },
 
 
-        retractLeft: function (fact) {
-            var factId = fact.id, tuples = this.allTuples[fact.id] || [], context, blocking, blocker;
-            while (tuples.length) {
-                context = tuples.pop();
-                if (indexOf(context.factIds, factId) !== -1) {
-                    this.__removeFromAllTupleMemory(context);
-                    this.__removeFromLeftMemory(context);
-                    this.__removeFromLeftTupleMemory(context);
-                    if ((blocker = context.blocker)) {
-                        blocking = blocker.blocking;
-                        blocking.splice(indexOf(blocking, context), 1);
-                        context.blocker = null;
-                    }
+        retractLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context);
+            if (ctx) {
+                this.__propagate("retract", ctx.data.clone());
+            } else {
+                if (!this.removeFromLeftBlockedMemory(context)) {
+                    throw new Error();
                 }
             }
-            delete this.leftMemory[factId];
-            delete this.leftTupleMemory[factId];
-            this.propagateRetract(fact);
-
         },
 
         assertLeft: function (context) {
-            var values = this.rightTuples, thisConstraint = this.constraint, i = -1, l = values.length, rc;
-            if (l !== 0) {
+            var values = this.rightTuples,
+                node,
+                thisConstraint = this.constraint, rc;
+            if (values.length) {
+                node = {next: values.head};
                 thisConstraint.setLeftContext(context);
-                while (++i < l) {
-                    if (thisConstraint.setRightContext(rc = values[i]).isMatch()) {
+                while ((node = node.next) && context) {
+                    if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
                         context.blocker = rc;
-                        rc.blocking.push(context);
-                        this.__addToLeftTupleMemory(context);
+                        this.addToLeftBlockedMemory(rc.blocking.push(context));
                         context = null;
-                        break;
                     }
                 }
+                thisConstraint.clearContexts();
             }
             if (context) {
-                this.__addToLeftMemory(context).propagateAssert(new Context(context.fact, null, context.match));
+                this.__addToLeftMemory(context);
+                this.__propagate("assert", context.clone());
             }
         },
 
         assertRight: function (context) {
-            context.blocking = [];
-            this.rightTuples.push(context);
-            this.rightMemory[context.fact.id] = context;
-            var fl = this.leftTuples, i = fl.length, leftContext, thisConstraint = this.constraint;
-            thisConstraint.setRightContext(context);
-            while (--i > -1) {
-                leftContext = fl[i];
-                if (thisConstraint.setLeftContext(leftContext).isMatch()) {
-                    this._propagateRetractResolve(leftContext.match);
-                    //blocked so remove from memory
-                    this.__removeFromLeftMemory(leftContext);
-                    leftContext.blocker = context;
-                    context.blocking.push(leftContext);
-                    this.__addToLeftTupleMemory(leftContext);
-                }
-            }
-            thisConstraint.clearContexts();
-        },
-
-        __removeFromLeftMemory: function (context) {
-            var leftMemories = this.leftMemory[context.fact.id] || [], lc, tuples = this.leftTuples;
-            for (var i = 0, l = tuples.length; i < l; i++) {
-                lc = tuples[i];
-                if (lc === context) {
-                    tuples.splice(i, 1);
-                    leftMemories.splice(indexOf(leftMemories, lc), 1);
-                    break;
+            this.__addToRightMemory(context);
+            context.blocking = new LinkedList();
+            var fl = this.leftTuples, leftContext, node, thisConstraint = this.constraint;
+            if (fl.length) {
+                node = {next: fl.head};
+                thisConstraint.setRightContext(context);
+                while ((node = node.next)) {
+                    leftContext = node.data;
+                    if (thisConstraint.setLeftContext(leftContext).isMatch()) {
+                        this.__propagate("retract", leftContext.clone());
+                        this.removeFromLeftMemory(leftContext);
+                        leftContext.blocker = context;
+                        this.addToLeftBlockedMemory(context.blocking.push(leftContext));
+                    }
                 }
+                thisConstraint.clearContexts();
             }
-            return this;
         },
 
-        __removeFromLeftTupleMemory: function (context) {
-            var leftMemories = this.leftTupleMemory[context.fact.id] || [], lc;
-            for (var i = 0, l = leftMemories.length; i < l; i++) {
-                lc = leftMemories[i];
-                if (lc === context) {
-                    leftMemories.splice(i, 1);
-                    break;
-                }
+        addToLeftBlockedMemory: function (context) {
+            var data = context.data, hashCode = data.hashCode;
+            var ctx = this.leftMemory[hashCode];
+            this.leftTupleMemory[hashCode] = context;
+            if (ctx) {
+                this.leftTuples.remove(ctx);
             }
             return this;
         },
 
-        __addToAllTupleMemory: function (context) {
-            var factIds = context.factIds, i = -1, l = factIds.length, factId, allTuples = this.allTuples, tuples;
-            while (++i < l) {
-                factId = factIds[i];
-                tuples = allTuples[factId] = (allTuples[factId] || []);
-                if (indexOf(tuples, context) === -1) {
-                    tuples.push(context);
-                }
+        removeFromLeftBlockedMemory: function (context) {
+            var ret = this.leftTupleMemory[context.hashCode] || null;
+            if (ret) {
+                delete this.leftTupleMemory[context.hashCode];
+                ret.data.blocker.blocking.remove(ret);
             }
-            return this;
-
+            return ret;
         },
 
-        __removeFromAllTupleMemory: function (context) {
-            var factIds = context.factIds, i = -1, l = factIds.length, factId, allTuples = this.allTuples, tuples, index;
-            while (++i < l) {
-                factId = factIds[i];
-                tuples = allTuples[factId];
-                index = indexOf(tuples, context);
-                if (index !== -1) {
-                    tuples.splice(i, 1);
+        modifyLeft: function (context) {
+            var ctx = this.removeFromLeftMemory(context),
+                leftContext,
+                thisConstraint = this.constraint,
+                rightTuples = this.rightTuples,
+                l = rightTuples.length,
+                isBlocked = false,
+                node, rc, blocker;
+            if (!ctx) {
+                //blocked before
+                ctx = this.removeFromLeftBlockedMemory(context);
+                isBlocked = true;
+            }
+            if (ctx) {
+                leftContext = ctx.data;
+
+                if (leftContext && leftContext.blocker) {
+                    //we were blocked before so only check nodes previous to our blocker
+                    blocker = this.rightMemory[leftContext.blocker.hashCode];
+                }
+                if (blocker) {
+                    thisConstraint.setLeftContext(context);
+                    if (thisConstraint.setRightContext(rc = blocker.data).isMatch()) {
+                        //we cant be proagated so retract previous
+                        if (!isBlocked) {
+                            //we were asserted before so retract
+                            this.__propagate("retract", leftContext.clone());
+                        }
+                        context.blocker = rc;
+                        this.addToLeftBlockedMemory(rc.blocking.push(context));
+                        context = null;
+                    }
                 }
-            }
-            return this;
-
-        },
+                if (context && l) {
+                    node = {next: rightTuples.head};
+                    //we were propogated before
+                    thisConstraint.setLeftContext(context);
+                    while ((node = node.next)) {
+                        if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
+                            //we cant be proagated so retract previous
+                            if (!isBlocked) {
+                                //we were asserted before so retract
+                                this.__propagate("retract", leftContext.clone());
+                            }
+                            this.addToLeftBlockedMemory(rc.blocking.push(context));
+                            context.blocker = rc;
+                            context = null;
+                            break;
+                        }
+                    }
+                    thisConstraint.clearContexts();
+                }
+                if (context) {
+                    //we can still be propogated
+                    this.__addToLeftMemory(context);
+                    if (!isBlocked) {
+                        //we weren't blocked before so modify
+                        this.__propagate("modify", context.clone());
+                    } else {
+                        //we were blocked before but aren't now
+                        this.__propagate("assert", context.clone());
+                    }
 
+                }
+            } else {
+                throw new Error();
+            }
+
+        },
+
+        modifyRight: function (context) {
+            var ctx = this.removeFromRightMemory(context);
+            if (ctx) {
+                var rightContext = ctx.data,
+                    leftTuples = this.leftTuples,
+                    leftTuplesLength = leftTuples.length,
+                    leftContext,
+                    thisConstraint = this.constraint,
+                    node,
+                    blocking = rightContext.blocking;
+                this.__addToRightMemory(context);
+                context.blocking = new LinkedList();
+                if (leftTuplesLength || blocking.length) {
+                    if (leftTuplesLength) {
+                        //check currently left tuples in memory
+                        thisConstraint.setRightContext(context);
+                        node = {next: leftTuples.head};
+                        while ((node = node.next)) {
+                            leftContext = node.data;
+                            if (thisConstraint.setLeftContext(leftContext).isMatch()) {
+                                this.__propagate("retract", leftContext.clone());
+                                this.removeFromLeftMemory(leftContext);
+                                this.addToLeftBlockedMemory(context.blocking.push(leftContext));
+                                leftContext.blocker = context;
+                            }
+                        }
+                    }
 
-        __addToLeftMemory: function (context) {
-            this._super(arguments);
-            this.__addToAllTupleMemory(context);
-            return this;
-        },
+                    if (blocking.length) {
+                        var rc;
+                        //check old blocked contexts
+                        //check if the same contexts blocked before are still blocked
+                        var blockingNode = {next: blocking.head};
+                        while ((blockingNode = blockingNode.next)) {
+                            leftContext = blockingNode.data;
+                            leftContext.blocker = null;
+                            thisConstraint.setRightContext(context);
+                            thisConstraint.setLeftContext(leftContext);
+                            if (thisConstraint.isMatch()) {
+                                leftContext.blocker = context;
+                                this.addToLeftBlockedMemory(context.blocking.push(leftContext));
+                                leftContext = null;
+                                return;
+                            } else {
+                                //we arent blocked anymore
+                                leftContext.blocker = null;
+                                node = ctx;
+                                while ((node = node.next)) {
+                                    if (thisConstraint.setRightContext(rc = node.data).isMatch()) {
+                                        leftContext.blocker = rc;
+                                        this.addToLeftBlockedMemory(rc.blocking.push(leftContext));
+                                        leftContext = null;
+                                        break;
+                                    }
+                                }
+                                if (leftContext) {
+                                    this.__addToLeftMemory(leftContext);
+                                    this.__propagate("assert", leftContext.clone());
+                                }
+                                thisConstraint.clearContexts();
+                            }
+                        }
+                        thisConstraint.clearContexts();
+                    }
 
-        __addToLeftTupleMemory: function (context) {
-            var o = context.fact;
-            var lm = this.leftTupleMemory[o.id];
-            if (!lm) {
-                lm = [];
-                this.leftTupleMemory[o.id] = lm;
+                }
+            } else {
+                throw new Error();
             }
-            lm.push(context);
-            this.__addToAllTupleMemory(context);
-            return this;
+
+
         }
     }
 }).as(module);
-},{"../context":9,"../extended":11,"./joinNode":21}],26:[function(require,module,exports){
+},{"../linkedList":16,"./joinNode":24}],29:[function(require,module,exports){
 var AlphaNode = require("./alphaNode"),
     Context = require("../context"),
     extd = require("../extended");
@@ -2694,6 +3460,22 @@ AlphaNode.extend({
 
         },
 
+        retract: function (context) {
+            this.__propagate("retract", new Context(context.fact, context.paths));
+        },
+
+        modify: function (context) {
+            var c = new Context(context.fact, context.paths);
+            var variables = this.variables, o = context.fact.object, item;
+            c.set(this.alias, o);
+            for (var i = 0, l = this.varLength; i < l; i++) {
+                item = variables[i];
+                c.set(item[1], o[item[0]]);
+            }
+            this.__propagate("modify", c);
+        },
+
+
         toString: function () {
             return "PropertyNode" + this.__count;
         }
@@ -2702,7 +3484,7 @@ AlphaNode.extend({
 
 
 
-},{"../context":9,"../extended":11,"./alphaNode":18}],27:[function(require,module,exports){
+},{"../context":10,"../extended":12,"./alphaNode":19}],30:[function(require,module,exports){
 var Node = require("./node");
 
 Node.extend({
@@ -2728,7 +3510,7 @@ Node.extend({
             this.__propagate("retractResolve", context);
         },
 
-        modify: function (context) {
+        propagateModify: function (context) {
             this.__propagate("modifyRight", context);
         },
 
@@ -2737,7 +3519,7 @@ Node.extend({
         }
     }
 }).as(module);
-},{"./node":24}],28:[function(require,module,exports){
+},{"./node":27}],31:[function(require,module,exports){
 var Node = require("./node"),
     extd = require("../extended"),
     bind = extd.bind,
@@ -2767,6 +3549,7 @@ Node.extend({
                 var rule = this.rule, bucket = this.bucket;
                 this.agenda.insert(this, {
                     rule: rule,
+                    hashCode: context.hashCode,
                     index: this.index,
                     name: rule.name,
                     recency: bucket.recency++,
@@ -2781,19 +3564,20 @@ Node.extend({
         },
 
         modify: function (context) {
+            this.agenda.retract(this, context);
             this.__assertModify(context);
         },
 
-        retract: function (fact) {
-            this.agenda.removeByFact(this, fact);
+        retract: function (context) {
+            this.agenda.retract(this, context);
         },
 
-        retractRight: function (fact) {
-            this.agenda.removeByFact(this, fact);
+        retractRight: function (context) {
+            this.agenda.retract(this, context);
         },
 
-        retractLeft: function (fact) {
-            this.agenda.removeByFact(this, fact);
+        retractLeft: function (context) {
+            this.agenda.retract(this, context);
         },
 
         assertLeft: function (context) {
@@ -2804,19 +3588,12 @@ Node.extend({
             this.__assertModify(context);
         },
 
-        retractResolve: function (match) {
-            var resolve = this.resolve;
-            this.agenda.retract(this, function (v) {
-                return resolve(v.match, match);
-            });
-        },
-
         toString: function () {
             return "TerminalNode " + this.rule.name;
         }
     }
 }).as(module);
-},{"../extended":11,"./node":24}],29:[function(require,module,exports){
+},{"../extended":12,"./node":27}],32:[function(require,module,exports){
 var AlphaNode = require("./alphaNode"),
     Context = require("../context");
 
@@ -2829,9 +3606,15 @@ AlphaNode.extend({
             }
         },
 
+        modify: function (fact) {
+            if (this.constraint.assert(fact.object)) {
+                this.__propagate("modify", fact);
+            }
+        },
+
         retract: function (fact) {
             if (this.constraint.assert(fact.object)) {
-                this.propagateRetract(fact);
+                this.__propagate("retract", fact);
             }
         },
 
@@ -2848,15 +3631,15 @@ AlphaNode.extend({
         },
 
         __propagate: function (method, fact) {
-            var es = this.__entrySet, i = es.length - 1;
-            for (; i >= 0; i--) {
+            var es = this.__entrySet, i = -1, l = es.length;
+            while (++i < l) {
                 var e = es[i], outNode = e.key, paths = e.value;
                 outNode[method](new Context(fact, paths));
             }
         }
     }
 }).as(module);
-},{"../context":9,"./alphaNode":18}],30:[function(require,module,exports){
+},{"../context":10,"./alphaNode":19}],33:[function(require,module,exports){
 var process=require("__browserify_process");/* parser generated by jison 0.4.6 */
 /*
   Returns a Parser object of the following structure:
@@ -2933,9 +3716,9 @@ var process=require("__browserify_process");/* parser generated by jison 0.4.6 *
 var parser = (function(){
 var parser = {trace: function trace() { },
 yy: {},
-symbols_: {"error":2,"expressions":3,"EXPRESSION":4,"EOF":5,"UNARY_EXPRESSION":6,"LITERAL_EXPRESSION":7,"-":8,"!":9,"MULTIPLICATIVE_EXPRESSION":10,"*":11,"/":12,"%":13,"ADDITIVE_EXPRESSION":14,"+":15,"EXPONENT_EXPRESSION":16,"^":17,"RELATIONAL_EXPRESSION":18,"<":19,">":20,"<=":21,">=":22,"EQUALITY_EXPRESSION":23,"==":24,"!=":25,"=~":26,"!=~":27,"IN_EXPRESSION":28,"in":29,"ARRAY_EXPRESSION":30,"notIn":31,"OBJECT_EXPRESSION":32,"AND_EXPRESSION":33,"&&":34,"OR_EXPRESSION":35,"||":36,"ARGUMENT_LIST":37,",":38,"IDENTIFIER_EXPRESSION":39,"IDENTIFIER":40,".":41,"[":42,"STRING_EXPRESSION":43,"]":44,"(":45,")":46,"STRING":47,"NUMBER_EXPRESSION":48,"NUMBER":49,"REGEXP_EXPRESSION":50,"REGEXP":51,"BOOLEAN_EXPRESSION":52,"BOOLEAN":53,"NULL_EXPRESSION":54,"NULL":55,"$accept":0,"$end":1},
-terminals_: {2:"error",5:"EOF",8:"-",9:"!",11:"*",12:"/",13:"%",15:"+",17:"^",19:"<",20:">",21:"<=",22:">=",24:"==",25:"!=",26:"=~",27:"!=~",29:"in",31:"notIn",34:"&&",36:"||",38:",",40:"IDENTIFIER",41:".",42:"[",44:"]",45:"(",46:")",47:"STRING",49:"NUMBER",51:"REGEXP",53:"BOOLEAN",55:"NULL"},
-productions_: [0,[3,2],[6,1],[6,2],[6,2],[10,1],[10,3],[10,3],[10,3],[14,1],[14,3],[14,3],[16,1],[16,3],[18,1],[18,3],[18,3],[18,3],[18,3],[23,1],[23,3],[23,3],[23,3],[23,3],[28,1],[28,3],[28,3],[28,3],[28,3],[33,1],[33,3],[35,1],[35,3],[37,1],[37,3],[39,1],[32,1],[32,3],[32,4],[32,4],[32,3],[32,4],[43,1],[48,1],[50,1],[52,1],[54,1],[30,2],[30,3],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,3],[4,1]],
+symbols_: {"error":2,"expressions":3,"EXPRESSION":4,"EOF":5,"UNARY_EXPRESSION":6,"LITERAL_EXPRESSION":7,"-":8,"!":9,"MULTIPLICATIVE_EXPRESSION":10,"*":11,"/":12,"%":13,"ADDITIVE_EXPRESSION":14,"+":15,"EXPONENT_EXPRESSION":16,"^":17,"RELATIONAL_EXPRESSION":18,"<":19,">":20,"<=":21,">=":22,"EQUALITY_EXPRESSION":23,"==":24,"!=":25,"=~":26,"!=~":27,"IN_EXPRESSION":28,"in":29,"ARRAY_EXPRESSION":30,"notIn":31,"OBJECT_EXPRESSION":32,"AND_EXPRESSION":33,"&&":34,"OR_EXPRESSION":35,"||":36,"ARGUMENT_LIST":37,",":38,"IDENTIFIER_EXPRESSION":39,"IDENTIFIER":40,".":41,"[":42,"STRING_EXPRESSION":43,"]":44,"NUMBER_EXPRESSION":45,"(":46,")":47,"STRING":48,"NUMBER":49,"REGEXP_EXPRESSION":50,"REGEXP":51,"BOOLEAN_EXPRESSION":52,"BOOLEAN":53,"NULL_EXPRESSION":54,"NULL":55,"$accept":0,"$end":1},
+terminals_: {2:"error",5:"EOF",8:"-",9:"!",11:"*",12:"/",13:"%",15:"+",17:"^",19:"<",20:">",21:"<=",22:">=",24:"==",25:"!=",26:"=~",27:"!=~",29:"in",31:"notIn",34:"&&",36:"||",38:",",40:"IDENTIFIER",41:".",42:"[",44:"]",46:"(",47:")",48:"STRING",49:"NUMBER",51:"REGEXP",53:"BOOLEAN",55:"NULL"},
+productions_: [0,[3,2],[6,1],[6,2],[6,2],[10,1],[10,3],[10,3],[10,3],[14,1],[14,3],[14,3],[16,1],[16,3],[18,1],[18,3],[18,3],[18,3],[18,3],[23,1],[23,3],[23,3],[23,3],[23,3],[28,1],[28,3],[28,3],[28,3],[28,3],[33,1],[33,3],[35,1],[35,3],[37,1],[37,3],[39,1],[32,1],[32,3],[32,4],[32,4],[32,4],[32,3],[32,4],[43,1],[45,1],[50,1],[52,1],[54,1],[30,2],[30,3],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,1],[7,3],[4,1]],
 performAction: function anonymous(yytext, yyleng, yylineno, yy, yystate /* action[1] */, $$ /* vstack */, _$ /* lstack */) {
 /* this == yyval */
 
@@ -2997,29 +3780,31 @@ case 38:this.$ = [$$[$0-3],$$[$0-1], 'propLookup'];
 break;
 case 39:this.$ = [$$[$0-3],$$[$0-1], 'propLookup'];
 break;
-case 40:this.$ = [$$[$0-2], [null, null, 'arguments'], 'function']
+case 40:this.$ = [$$[$0-3],$$[$0-1], 'propLookup'];
+break;
+case 41:this.$ = [$$[$0-2], [null, null, 'arguments'], 'function']
 break;
-case 41:this.$ = [$$[$0-3], $$[$0-1], 'function']
+case 42:this.$ = [$$[$0-3], $$[$0-1], 'function']
 break;
-case 42:this.$ = [String(yytext.replace(/^['|"]|['|"]$/g, '')), null, 'string'];
+case 43:this.$ = [String(yytext.replace(/^['|"]|['|"]$/g, '')), null, 'string'];
 break;
-case 43:this.$ = [Number(yytext), null, 'number'];
+case 44:this.$ = [Number(yytext), null, 'number'];
 break;
-case 44:this.$ = [yytext, null, 'regexp'];
+case 45:this.$ = [yytext, null, 'regexp'];
 break;
-case 45:this.$ = [yytext.replace(/^\s+/, '') == 'true', null, 'boolean'];
+case 46:this.$ = [yytext.replace(/^\s+/, '') == 'true', null, 'boolean'];
 break;
-case 46:this.$ = [null, null, 'null'];
+case 47:this.$ = [null, null, 'null'];
 break;
-case 47:this.$ = [null, null, 'array'];
+case 48:this.$ = [null, null, 'array'];
 break;
-case 48:this.$ = [$$[$0-1], null, 'array'];
+case 49:this.$ = [$$[$0-1], null, 'array'];
 break;
-case 56:this.$ = [$$[$0-1], null, 'composite']
+case 57:this.$ = [$$[$0-1], null, 'composite']
 break;
 }
 },
-table: 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],22:[2,16],24:[2,16],25:[2,16],26:[2,16],27:[2,16],34:[2,16],36:[2,16],47:[2,16]},{5:[2,17],17:[1,48],19:[2,17],20:[2,17],21:[2,17],22:[2,17],24:[2,17],25:[2,17],26:[2,17],27:[2,17],34:[2,17],36:[2,17],47:[2,17]},{5:[2,18],17:[1,48],19:[2,18],20:[2,18],21:[2,18],22:[2,18],24:[2,18],25:[2,18],26:[2,18],27:[2,18],34:[2,18],36:[2,18],47:[2,18]},{5:[2,37],8:[2,37],11:[2,37],12:[2,37],13:[2,37],15:[2,37],17:[2,37],19:[2,37],20:[2,37],21:[2,37],22:[2,37],24:[2,37],25:[2,37],26:[2,37],27:[2,37],29:[2,37],31:[2,37],34:[2,37],36:[2,37],38:[2,37],41:[2,37],42:[2,37],44:[2,37],46:[2,37],47:[2,37]},{44:[1,89]},{44:[1,90]},{41:[1,44],42:[1,45],44:[1,91],46:[1,46]},{5:[2,41],8:[2,41],11:[2,41],12:[2,41],13:[2,41],15:[2,41],17:[2,41],19:[2,41],20:[2,41],21:[2,41],22:[2,41],24:[2,41],25:[2,41],26:[2,41],27:[2,41],29:[2,41],31:[2,41],34:[2,41],36:[2,41],38:[2,41],41:[2,41],42:[2,41],44:[2,41],46:[2,41],47:[2,41]},{38:[1,83],47:[1,92]},{5:[2,57],8:[2,57],11:[2,57],12:[2,57],13:[2,57],15:[2,57],17:[2,57],19:[2,57],20:[2,57],21:[2,57],22:[2,57],24:[2,57],25:[2,57],26:[2,57],27:[2,57],29:[2,57],31:[2,57],34:[2,57],36:[2,57],38:[2,57],44:[2,57],47:[2,57]},{5:[2,13],8:[1,53],15:[1,52],17:[2,13],19:[2,13],20:[2,13],21:[2,13],22:[2,13],24:[2,13],25:[2,13],26:[2,13],27:[2,13],34:[2,13],36:[2,13],47:[2,13]},{5:[2,49],8:[2,49],11:[2,49],12:[2,49],13:[2,49],15:[2,49],17:[2,49],19:[2,49],20:[2,49],21:[2,49],22:[2,49],24:[2,49],25:[2,49],26:[2,49],27:[2,49],29:[2,49],31:[2,49],34:[2,49],36:[2,49],38:[2,49],44:[2,49],47:[2,49]},{7:93,30:15,32:14,39:23,40:[1,26],42:[1,24],43:9,45:10,46:[1,16],48:[1,18],49:[1,19],50:11,51:[1,20],52:12,53:[1,21],54:13,55:[1,22]},{5:[2,10],8:[2,10],11:[1,54],12:[1,55],13:[1,56],15:[2,10],17:[2,10],19:[2,10],20:[2,10],21:[2,10],22:[2,10],24:[2,10],25:[2,10],26:[2,10],27:[2,10],34:[2,10],36:[2,10],47:[2,10]},{5:[2,11],8:[2,11],11:[1,54],12:[1,55],13:[1,56],15:[2,11],17:[2,11],19:[2,11],20:[2,11],21:[2,11],22:[2,11],24:[2,11],25:[2,11],26:[2,11],27:[2,11],34:[2,11],36:[2,11],47:[2,11]},{5:[2,6],8:[2,6],11:[2,6],12:[2,6],13:[2,6],15:[2,6],17:[2,6],19:[2,6],20:[2,6],21:[2,6],22:[2,6],24:[2,6],25:[2,6],26:[2,6],27:[2,6],34:[2,6],36:[2,6],47:[2,6]},{5:[2,7],8:[2,7],11:[2,7],12:[2,7],13:[2,7],15:[2,7],17:[2,7],19:[2,7],20:[2,7],21:[2,7],22:[2,7],24:[2,7],25:[2,7],26:[2,7],27:[2,7],34:[2,7],36:[2,7],47:[2,7]},{5:[2,8],8:[2,8],11:[2,8],12:[2,8],13:[2,8],15:[2,8],17:[2,8],19:[2,8],20:[2,8],21:[2,8],22:[2,8],24:[2,8],25:[2,8],26:[2,8],27:[2,8],34:[2,8],36:[2,8],47:[2,8]},{5:[2,38],8:[2,38],11:[2,38],12:[2,38],13:[2,38],15:[2,38],17:[2,38],19:[2,38],20:[2,38],21:[2,38],22:[2,38],24:[2,38],25:[2,38],26:[2,38],27:[2,38],29:[2,38],31:[2,38],34:[2,38],36:[2,38],38:[2,38],41:[2,38],42:[2,38],44:[2,38],46:[2,38],47:[2,38]},{5:[2,39],8:[2,39],11:[2,39],12:[2,39],13:[2,39],15:[2,39],17:[2,39],19:[2,39],20:[2,39],21:[2,39],22:[2,39],24:[2,39],25:[2,39],26:[2,39],27:[2,39],29:[2,39],31:[2,39],34:[2,39],36:[2,39],38:[2,39],41:[2,39],42:[2,39],44:[2,39],46:[2,39],47:[2,39]},{5:[2,40],8:[2,40],11:[2,40],12:[2,40],13:[2,40],15:[2,40],17:[2,40],19:[2,40],20:[2,40],21:[2,40],22:[2,40],24:[2,40],25:[2,40],26:[2,40],27:[2,40],29:[2,40],31:[2,40],34:[2,40],36:[2,40],38:[2,40],41:[2,40],42:[2,40],44:[2,40],46:[2,40],47:[2,40]},{5:[2,42],8:[2,42],11:[2,42],12:[2,42],13:[2,42],15:[2,42],17:[2,42],19:[2,42],20:[2,42],21:[2,42],22:[2,42],24:[2,42],25:[2,42],26:[2,42],27:[2,42],29:[2,42],31:[2,42],34:[2,42],36:[2,42],38:[2,42],41:[2,42],42:[2,42],44:[2,42],46:[2,42],47:[2,42]},{38:[2,34],44:[2,34],47:[2,34]}],
 defaultActions: {31:[2,1]},
 parseError: function parseError(str, hash) {
     if (hash.recoverable) {
@@ -3511,9 +4296,9 @@ case 15:/* skip whitespace */
 break;
 case 16:return 49;
 break;
-case 17:return 47;
+case 17:return 48;
 break;
-case 18:return 47;
+case 18:return 48;
 break;
 case 19:return 40;
 break;
@@ -3559,13 +4344,13 @@ case 39:return 15;
 break;
 case 40:return 17;
 break;
-case 41:return 45;
+case 41:return 46;
 break;
 case 42:return 44;
 break;
 case 43:return 42;
 break;
-case 44:return 46;
+case 44:return 47;
 break;
 case 45:return 9;
 break;
@@ -3603,7 +4388,7 @@ if (typeof module !== 'undefined' && require.main === module) {
   exports.main(process.argv.slice(1));
 }
 }
-},{"__browserify_process":51,"fs":48,"path":49}],31:[function(require,module,exports){
+},{"__browserify_process":54,"fs":51,"path":52}],34:[function(require,module,exports){
 (function () {
     "use strict";
     var constraintParser = require("./constraint/parser"),
@@ -3621,7 +4406,7 @@ if (typeof module !== 'undefined' && require.main === module) {
         return noolParser.parse(source, file);
     };
 })();
-},{"./constraint/parser":30,"./nools/nool.parser":32}],32:[function(require,module,exports){
+},{"./constraint/parser":33,"./nools/nool.parser":35}],35:[function(require,module,exports){
 "use strict";
 
 var tokens = require("./tokens.js"),
@@ -3631,7 +4416,7 @@ var tokens = require("./tokens.js"),
 
 var parse = function (src, keywords, context) {
     var orig = src;
-    src = src.replace(/\/\/(.*)[\n|\r|\r\n]/g, "").replace(/\n|\r|\r\n/g, " ");
+    src = src.replace(/\/\/(.*)/g, "").replace(/\n|\r|\r\n/g, " ");
 
     var blockTypes = new RegExp("^(" + keys(keywords).join("|") + ")"), index;
     while (src && (index = utils.findNextTokenIndex(src)) !== -1) {
@@ -3661,7 +4446,7 @@ exports.parse = function (src, file) {
 };
 
 
-},{"../../extended":11,"./tokens.js":33,"./util.js":34}],33:[function(require,module,exports){
+},{"../../extended":12,"./tokens.js":36,"./util.js":37}],36:[function(require,module,exports){
 var process=require("__browserify_process");"use strict";
 
 var utils = require("./util.js"),
@@ -3749,6 +4534,7 @@ var ruleTokens = {
         };
         var constraintRegExp = /(\{ *(?:["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']? *(?:, *["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']?)*)+ *\})/;
         var predicateExp = /^(\w+) *\((.*)\)$/m;
+        var fromRegExp = /(\bfrom\s+.*)/;
         var parseRules = function (str) {
             var rules = [];
             var ruleLines = str.split(";"), l = ruleLines.length, ruleLine;
@@ -3771,9 +4557,14 @@ var ruleTokens = {
                     if (parts && parts.length) {
                         rule.push(parts[2], parts[1]);
                         var constraints = parts[3].replace(/^\s*|\s*$/g, "");
-                        var hashParts = constraints.match(constraintRegExp);
+                        var hashParts = constraints.match(constraintRegExp), from = null, fromMatch;
                         if (hashParts) {
                             var hash = hashParts[1], constraint = constraints.replace(hash, "");
+                            if (fromRegExp.test(constraint)) {
+                                fromMatch = constraint.match(fromRegExp);
+                                from = fromMatch[0];
+                                constraint = constraint.replace(fromMatch[0], "");
+                            }
                             if (constraint) {
                                 rule.push(constraint.replace(/^\s*|\s*$/g, ""));
                             }
@@ -3781,8 +4572,16 @@ var ruleTokens = {
                                 rule.push(eval("(" + hash.replace(/(\$?\w+)\s*:\s*(\$?\w+)/g, '"$1" : "$2"') + ")"));
                             }
                         } else if (constraints && !isWhiteSpace(constraints)) {
+                            if (fromRegExp.test(constraints)) {
+                                fromMatch = constraints.match(fromRegExp);
+                                from = fromMatch[0];
+                                constraints = constraints.replace(fromMatch[0], "");
+                            }
                             rule.push(constraints);
                         }
+                        if (from) {
+                            rule.push(from);
+                        }
                         rules.push(rule);
                     } else {
                         throw new Error("Invalid constraint " + ruleLine);
@@ -3972,7 +4771,7 @@ var topLevelTokens = {
 module.exports = topLevelTokens;
 
 
-},{"../../extended":11,"./util.js":34,"__browserify_process":51,"fs":48}],34:[function(require,module,exports){
+},{"../../extended":12,"./util.js":37,"__browserify_process":54,"fs":51}],37:[function(require,module,exports){
 var process=require("__browserify_process");"use strict";
 
 var path = require("path");
@@ -4064,113 +4863,216 @@ var findNextTokenIndex = exports.findNextTokenIndex = function (str, startIndex,
 exports.findNextToken = function (str, startIndex, endIndex) {
     return str.charAt(findNextTokenIndex(str, startIndex, endIndex));
 };
-},{"__browserify_process":51,"path":49}],35:[function(require,module,exports){
-(function () {
-    "use strict";
-    var extd = require("./extended"),
-        merge = extd.merge,
-        forEach = extd.forEach,
-        declare = extd.declare,
-        constraintMatcher = require("./constraintMatcher"),
-        constraint = require("./constraint");
-
-
-    var Pattern = declare({});
-
-    var ObjectPattern = Pattern.extend({
-        instance: {
-            constructor: function (type, alias, conditions, store, options) {
-                options = options || {};
-                this.type = type;
-                this.alias = alias;
-                this.conditions = conditions;
-                this.pattern = options.pattern;
-                this.constraints = [new constraint.ObjectConstraint(type)];
-                var constrnts = constraintMatcher.toConstraints(conditions, merge({alias: alias}, options));
-                if (constrnts.length) {
-                    this.constraints = this.constraints.concat(constrnts);
-                } else {
-                    var cnstrnt = new constraint.TrueConstraint();
-                    this.constraints.push(cnstrnt);
-                }
-                if (store && !extd.isEmpty(store)) {
-                    var atm = new constraint.HashConstraint(store);
-                    this.constraints.push(atm);
-                }
-                forEach(this.constraints, function (constraint) {
-                    constraint.set("alias", alias);
-                });
-            },
+},{"__browserify_process":54,"path":52}],38:[function(require,module,exports){
+"use strict";
+var extd = require("./extended"),
+    isEmpty = extd.isEmpty,
+    merge = extd.merge,
+    forEach = extd.forEach,
+    declare = extd.declare,
+    constraintMatcher = require("./constraintMatcher"),
+    constraint = require("./constraint"),
+    EqualityConstraint = constraint.EqualityConstraint;
 
-            hasConstraint: function (type) {
-                return extd.some(this.constraints, function (c) {
-                    return c instanceof type;
-                });
-            },
+var id = 0;
+var Pattern = declare({});
 
-            hashCode: function () {
-                return [this.type, this.alias, extd.format("%j", this.conditions)].join(":");
-            },
+var ObjectPattern = Pattern.extend({
+    instance: {
+        constructor: function (type, alias, conditions, store, options) {
+            options = options || {};
+            this.id = id++;
+            this.type = type;
+            this.alias = alias;
+            this.conditions = conditions;
+            this.pattern = options.pattern;
+            var constraints = [new constraint.ObjectConstraint(type)];
+            var constrnts = constraintMatcher.toConstraints(conditions, merge({alias: alias}, options));
+            if (constrnts.length) {
+                constraints = constraints.concat(constrnts);
+            } else {
+                var cnstrnt = new constraint.TrueConstraint();
+                constraints.push(cnstrnt);
+            }
+            if (store && !isEmpty(store)) {
+                var atm = new constraint.HashConstraint(store);
+                constraints.push(atm);
+            }
+
+            forEach(constraints, function (constraint) {
+                constraint.set("alias", alias);
+            });
+            this.constraints = constraints;
+        },
 
-            toString: function () {
-                return extd.format("%j", this.constraints);
+        getSpecificity: function () {
+            var constraints = this.constraints, specificity = 0;
+            for (var i = 0, l = constraints.length; i < l; i++) {
+                if (constraints[i] instanceof EqualityConstraint) {
+                    specificity++;
+                }
             }
+            return specificity;
+        },
+
+        hasConstraint: function (type) {
+            return extd.some(this.constraints, function (c) {
+                return c instanceof type;
+            });
+        },
+
+        hashCode: function () {
+            return [this.type, this.alias, extd.format("%j", this.conditions)].join(":");
+        },
+
+        toString: function () {
+            return extd.format("%j", this.constraints);
         }
-    }).as(exports, "ObjectPattern");
+    }
+}).as(exports, "ObjectPattern");
 
-    ObjectPattern.extend().as(exports, "NotPattern");
+var FromPattern = ObjectPattern.extend({
+    instance: {
+        constructor: function (type, alias, conditions, store, from, options) {
+            this._super([type, alias, conditions, store, options]);
+            this.from = from.from;
+        },
 
-    Pattern.extend({
+        hasConstraint: function (type) {
+            return extd.some(this.constraints, function (c) {
+                return c instanceof type;
+            });
+        },
 
-        instance: {
-            constructor: function (left, right) {
-                this.leftPattern = left;
-                this.rightPattern = right;
-            },
+        getSpecificity: function () {
+            return this._super(arguments) + 1;
+        },
 
-            hashCode: function () {
-                return [this.leftPattern.hashCode(), this.rightPattern.hashCode()].join(":");
-            },
+        hashCode: function () {
+            return [this.type, this.alias, extd.format("%j", this.conditions), this.from.from].join(":");
+        },
 
-            getters: {
-                constraints: function () {
-                    return this.leftPattern.constraints.concat(this.rightPattern.constraints);
-                }
-            }
+        toString: function () {
+            return extd.format("%j from %s", this.constraints, this.from.from);
         }
+    }
+}).as(exports, "FromPattern");
 
-    }).as(exports, "CompositePattern");
 
+FromPattern.extend().as(exports, "FromNotPattern");
+ObjectPattern.extend().as(exports, "NotPattern");
 
-    var InitialFact = declare({}).as(exports, "InitialFact");
+Pattern.extend({
 
-    ObjectPattern.extend({
-        instance: {
-            constructor: function () {
-                this._super([InitialFact, "i", [], {}]);
-            },
+    instance: {
+        constructor: function (left, right) {
+            this.id = id++;
+            this.leftPattern = left;
+            this.rightPattern = right;
+        },
 
-            assert: function () {
-                return true;
+        hashCode: function () {
+            return [this.leftPattern.hashCode(), this.rightPattern.hashCode()].join(":");
+        },
+
+        getSpecificity: function () {
+            return this.rightPattern.getSpecificity() + this.leftPattern.getSpecificity();
+        },
+
+        getters: {
+            constraints: function () {
+                return this.leftPattern.constraints.concat(this.rightPattern.constraints);
             }
         }
-    }).as(exports, "InitialFactPattern");
+    }
 
-})();
+}).as(exports, "CompositePattern");
 
 
-},{"./constraint":7,"./constraintMatcher":8,"./extended":11}],36:[function(require,module,exports){
+var InitialFact = declare({
+    constuctor: function(){
+        this.id = id++;
+    }
+}).as(exports, "InitialFact");
+
+ObjectPattern.extend({
+    instance: {
+        constructor: function () {
+            this._super([InitialFact, "i", [], {}]);
+        },
+
+        assert: function () {
+            return true;
+        }
+    }
+}).as(exports, "InitialFactPattern");
+
+
+
+
+},{"./constraint":8,"./constraintMatcher":9,"./extended":12}],39:[function(require,module,exports){
 "use strict";
 var extd = require("./extended"),
     isArray = extd.isArray,
     Promise = extd.Promise,
     declare = extd.declare,
+    isHash = extd.isHash,
+    isString = extd.isString,
+    format = extd.format,
     parser = require("./parser"),
     pattern = require("./pattern"),
     ObjectPattern = pattern.ObjectPattern,
+    FromPattern = pattern.FromPattern,
     NotPattern = pattern.NotPattern,
+    FromNotPattern = pattern.FromNotPattern,
     CompositePattern = pattern.CompositePattern;
 
+var parseExtra = extd
+    .switcher()
+    .isUndefinedOrNull(function () {
+        return null;
+    })
+    .isLike(/^from +/, function (s) {
+        return {from: s.replace(/^from +/, "").replace(/^\s*|\s*$/g, "")};
+    })
+    .def(function (o) {
+        throw new Error("invalid rule constraint option " + o);
+    })
+    .switcher();
+
+var normailizeConstraint = extd
+    .switcher()
+    .isLength(1, function (c) {
+        throw new Error("invalid rule constraint " + format("%j", [c]));
+    })
+    .isLength(2, function (c) {
+        c.push("true");
+        return c;
+    })
+    //handle case where c[2] is a hash rather than a constraint string
+    .isLength(3, function (c) {
+        if (isHash(c[2])) {
+            c.splice(2, 0, "true");
+        }
+        return c;
+    })
+    //handle case where c[3] is a from clause rather than a hash for references
+    .isLength(4, function (c) {
+        if (isString(c[3])) {
+            c.splice(3, 0, null);
+            c[4] = parseExtra(c[4]);
+        }
+        return c;
+    })
+    .def(function (c) {
+        if (c.length === 5) {
+            c[4] = parseExtra(c[4]);
+        }
+        return c;
+    })
+    .switcher();
+
+
 var getParamTypeSwitch = extd
     .switcher()
     .isEq("string", function () {
@@ -4230,29 +5132,56 @@ var parsePattern = extd
     })
     .contains("not", 0, function (condition) {
         condition.shift();
-        return [
-            new NotPattern(
-                getParamType(condition[0]),
-                condition[1] || "m",
-                parser.parseConstraint(condition[2] || "true"),
-                condition[3] || {},
-                {scope: condition.scope, pattern: condition[2]}
-            )
-        ];
+        condition = normailizeConstraint(condition);
+        if (condition[4] && condition[4].from) {
+            return [
+                new FromNotPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    condition[4],
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        } else {
+            return [
+                new NotPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        }
     })
     .def(function (condition) {
-        return [
-            new ObjectPattern(
-                getParamType(condition[0]),
-                condition[1] || "m",
-                parser.parseConstraint(condition[2] || "true"),
-                condition[3] || {},
-                {scope: condition.scope, pattern: condition[2]}
-            )
-        ];
+        condition = normailizeConstraint(condition);
+        if (condition[4] && condition[4].from) {
+            return [
+                new FromPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    condition[4],
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        } else {
+            return [
+                new ObjectPattern(
+                    getParamType(condition[0]),
+                    condition[1] || "m",
+                    parser.parseConstraint(condition[2] || "true"),
+                    condition[3] || {},
+                    {scope: condition.scope, pattern: condition[2]}
+                )
+            ];
+        }
     }).switcher();
 
-
 var Rule = declare({
     instance: {
         constructor: function (name, options, pattern, cb) {
@@ -4283,7 +5212,7 @@ var Rule = declare({
 });
 
 function createRule(name, options, conditions, cb) {
-    if (extd.isArray(options)) {
+    if (isArray(options)) {
         cb = conditions;
         conditions = options;
     } else {
@@ -4346,12 +5275,11 @@ exports.createRule = createRule;
 
 
 
-},{"./extended":11,"./parser":31,"./pattern":35}],37:[function(require,module,exports){
+},{"./extended":12,"./parser":34,"./pattern":38}],40:[function(require,module,exports){
 "use strict";
-var declare = require("declare.js");
-
-
-var id = 0;
+var declare = require("declare.js"),
+    LinkedList = require("./linkedList"),
+    id = 0;
 
 var Fact = declare({
 
@@ -4379,26 +5307,69 @@ declare({
 
         constructor: function () {
             this.recency = 0;
-            this.facts = [];
+            this.facts = new LinkedList();
         },
 
         dispose: function () {
-            this.facts.length = 0;
+            this.facts.clear();
+        },
+
+        getFactHandle: function (o) {
+            var head = {next: this.facts.head}, ret;
+            while ((head = head.next)) {
+                var existingFact = head.data;
+                if (existingFact.equals(o)) {
+                    return existingFact;
+                }
+            }
+            if (!ret) {
+                ret = new Fact(o);
+                ret.recency = this.recency++;
+                //this.facts.push(ret);
+            }
+            return ret;
+        },
+
+        modifyFact: function (fact) {
+            var head = {next: this.facts.head};
+            while ((head = head.next)) {
+                var existingFact = head.data;
+                if (existingFact.equals(fact)) {
+                    existingFact.recency = this.recency++;
+                    return existingFact;
+                }
+            }
+            //if we made it here we did not find the fact
+            throw new Error("the fact to modify does not exist");
         },
 
         assertFact: function (fact) {
-            fact = new Fact(fact);
-            fact.recency = this.recency++;
-            this.facts.push(fact);
-            return fact;
+            var ret = new Fact(fact);
+            ret.recency = this.recency++;
+            this.facts.push(ret);
+            return ret;
+//            var head = {next: this.facts.head}, ret;
+//            while ((head = head.next)) {
+//                var existingFact = head.data;
+//                if (existingFact.equals(fact)) {
+//                    ret = existingFact;
+//                    break;
+//                }
+//            }
+//            if (!ret) {
+//                ret = new Fact(fact);
+//                ret.recency = this.recency++;
+//                this.facts.push(ret);
+//            }
+//            return ret;
         },
 
         retractFact: function (fact) {
-            var facts = this.facts, l = facts.length, i = -1, existingFact;
-            while (++i < l) {
-                existingFact = facts[i];
+            var facts = this.facts, head = {next: facts.head};
+            while ((head = head.next)) {
+                var existingFact = head.data;
                 if (existingFact.equals(fact)) {
-                    this.facts.splice(i, 1);
+                    facts.remove(head);
                     return existingFact;
                 }
             }
@@ -4412,7 +5383,7 @@ declare({
 }).as(exports, "WorkingMemory");
 
 
-},{"declare.js":42}],38:[function(require,module,exports){
+},{"./linkedList":16,"declare.js":45}],41:[function(require,module,exports){
 (function () {
     "use strict";
 
@@ -4457,7 +5428,7 @@ declare({
 }).call(this);
 
 
-},{"extended":43,"is-extended":53}],39:[function(require,module,exports){
+},{"extended":46,"is-extended":56}],42:[function(require,module,exports){
 (function () {
     "use strict";
     /*global define*/
@@ -5127,7 +6098,7 @@ declare({
 
 
 
-},{"arguments-extended":38,"extended":43,"is-extended":53}],40:[function(require,module,exports){
+},{"arguments-extended":41,"extended":46,"is-extended":56}],43:[function(require,module,exports){
 (function () {
     "use strict";
 
@@ -6075,7 +7046,7 @@ declare({
 
 
 
-},{"array-extended":39,"extended":43,"is-extended":53}],41:[function(require,module,exports){
+},{"array-extended":42,"extended":46,"is-extended":56}],44:[function(require,module,exports){
 (function () {
 
     /**
@@ -7002,9 +7973,9 @@ declare({
 
 
 
-},{}],42:[function(require,module,exports){
+},{}],45:[function(require,module,exports){
 module.exports = require("./declare.js");
-},{"./declare.js":41}],43:[function(require,module,exports){
+},{"./declare.js":44}],46:[function(require,module,exports){
 (function () {
     "use strict";
     /*global extender is, dateExtended*/
@@ -7103,7 +8074,7 @@ module.exports = require("./declare.js");
 
 
 
-},{"extender":45}],44:[function(require,module,exports){
+},{"extender":48}],47:[function(require,module,exports){
 (function () {
     /*jshint strict:false*/
 
@@ -7644,9 +8615,9 @@ module.exports = require("./declare.js");
     }
 
 }).call(this);
-},{"declare.js":42}],45:[function(require,module,exports){
+},{"declare.js":45}],48:[function(require,module,exports){
 module.exports = require("./extender.js");
-},{"./extender.js":44}],46:[function(require,module,exports){
+},{"./extender.js":47}],49:[function(require,module,exports){
 (function () {
     "use strict";
 
@@ -7885,7 +8856,7 @@ module.exports = require("./extender.js");
 
 
 
-},{"arguments-extended":38,"extended":43,"is-extended":53}],47:[function(require,module,exports){
+},{"arguments-extended":41,"extended":46,"is-extended":56}],50:[function(require,module,exports){
 var process=require("__browserify_process");if (!process.EventEmitter) process.EventEmitter = function () {};
 
 var EventEmitter = exports.EventEmitter = process.EventEmitter;
@@ -8081,10 +9052,10 @@ EventEmitter.listenerCount = function(emitter, type) {
   return ret;
 };
 
-},{"__browserify_process":51}],48:[function(require,module,exports){
+},{"__browserify_process":54}],51:[function(require,module,exports){
 // nothing to see here... no file methods for the browser
 
-},{}],49:[function(require,module,exports){
+},{}],52:[function(require,module,exports){
 var process=require("__browserify_process");function filter (xs, fn) {
     var res = [];
     for (var i = 0; i < xs.length; i++) {
@@ -8263,7 +9234,7 @@ exports.relative = function(from, to) {
 
 exports.sep = '/';
 
-},{"__browserify_process":51}],50:[function(require,module,exports){
+},{"__browserify_process":54}],53:[function(require,module,exports){
 require=(function(e,t,n,r){function i(r){if(!n[r]){if(!t[r]){if(e)return e(r);throw new Error("Cannot find module '"+r+"'")}var s=n[r]={exports:{}};t[r][0](function(e){var n=t[r][1][e];return i(n?n:e)},s,s.exports)}return n[r].exports}for(var s=0;sf&&j>f&&f++;);c=g[f]-h[f],c||(c=i-j)}return c||(c=a.recency-b.recency),c>0?1:-1},j=e({instance:{constructor:function(){this.memory={},this.memoryValues=new g},clear:function(){this.memoryValues.clear(),this.memory={},this.memory.length=this.memoryValues.length=0},get:function(a){var b=this.memory[a.id];return b?b.data:[]},remove:function(a){for(var b,c,e,f,g=a.match.facts,h=g.length,i=this.memoryValues,j=this.memory,k=-1;++k-1;)c=h[i],f.remove(c),e.remove(c),g.remove(c);h.length=0},retract:function(a,b){var c=this.rules[a.name],d=c.tree,e=c.factTable,f=this.getAgendaGroup(a.rule.agendaGroup);d.traverse(d.__root,k,function(a){b(a)&&(e.remove(a),f.remove(a),d.remove(a))})},insert:function(a,b){var c=this.rules[a.name],d=a.rule,e=d.agendaGroup;c.tree.insert(b),this.getAgendaGroup(e).insert(b),e&&d.autoFocus&&this.setFocus(e),c.factTable.insert(b)},dispose:function(){for(var a in this.agendaGroups)this.agendaGroups[a].clear();var b=this.rules;for(a in b)a in b&&(b[a].tree.clear(),b[a].factTable.clear());this.rules={}}}})},{"./extended":11,events:47}],4:[function(require,module,exports){"use strict";var extd=require("../extended"),forEach=extd.forEach,isString=extd.isString;exports.modifiers=["assert","modify","retract","emit","halt","focus"];var createFunction=function(body,defined,scope,scopeNames,definedNames){var declares=[];forEach(definedNames,function(a){-1!==body.indexOf(a)&&declares.push("var "+a+"= defined."+a+";")}),forEach(scopeNames,function(a){-1!==body.indexOf(a)&&declares.push("var "+a+"= scope."+a+";")}),body=["((function(){",declares.join(""),"\n	return ",body,"\n})())"].join("");try{return eval(body)}catch(e){throw new Error("Invalid action : "+body+"\n"+e.message)}},createDefined=function(){var a=function(a){a=isString(a)?new Function("return "+a+";")():a;var b=a.hasOwnProperty("constructor")&&"function"==typeof a.constructor?a.constructor:function(b){b=b||{};for(var c in b)c in a&&(this[c]=b[c])},c=b.prototype;for(var d in a)c[d]=a[d];return b};return function(b){return a(b.properties)}}();exports.createFunction=createFunction,exports.createDefined=createDefined},{"../extended":11}],5:[function(a,b,c){var d=a("__browserify_Buffer").Buffer,e=a("../extended"),f=a("../parser"),g=a("../constraintMatcher.js"),h=e.indexOf,i=e.forEach,j=e.removeDuplicates,k=e.map,l=e.hash,m=l.keys,n=e.merge,o=a("../rule"),p=a("./common"),q=p.createDefined,r=p.createFunction,s=function(a,b,c,d){var f=[];i(b,function(b){-1!==a.indexOf(b)&&f.push("var "+b+"= facts."+b+";")}),e(c).keys().forEach(function(b){-1!==a.indexOf(b)&&f.push("var "+b+"= defined."+b+";")}),e(d).keys().forEach(function(b){-1!==a.indexOf(b)&&f.push("var "+b+"= scope."+b+";")});var g=["facts","flow"];/next\(.*\)/.test(a)&&g.push("next"),a="with(flow){"+f.join("")+a+"}";try{return new Function("defined, scope","return "+new Function(g.join(","),a).toString())(c,d)}catch(h){throw new Error("Invalid action : "+a+"\n"+h.message)}},t=function(){var a=function(a,b,c,d,j){var k=[],l=a[0],m=a[1],n=a[2],o=a[3];if(e.isHash(n)&&(o=n,n=null),!l||!(l=d[l]))throw new Error("Invalid class "+a[0]+" for rule "+j);if(k.push(l),k.push(m,n,o),c.push(k),b.push(m),n&&i(g.getIdentifiers(f.parseConstraint(n)),function(a){b.push(a)}),e.isObject(o))for(var p in o){var q=o[p];-1===h(b,q)&&b.push(q)}};return function(b,c,d){var f=b.name;if(e.isEmpty(b))throw new Error("Rule is empty");var g=b.options||{};g.scope=d;var h=b.constraints||[],k=h.length;k||(h=["true"]);var l=b.action;if(e.isUndefined(l))throw new Error("No action was defined for rule "+f);var m=[],n=[];return e(h).forEach(function(b){if(b.length){var d=b[0];if("not"===d){var e=[];b.shift(),a(b,n,e,c,f);var g=e[0];g.unshift(d),m.push(g)}else if("or"===d){var h=[d];b.shift(),i(b,function(b){a(b,n,h,c,f)}),m.push(h)}else a(b,n,m,c,f),n=j(n)}}),o.createRule(f,g,m,s(l,n,c,d))}}();c.parse=function(a,b){return f.parseRuleSet(a,b)},c.compile=function(a,b,c,f){e.isFunction(b)?(c=b,b={}):(b=b||{},c=null);var g=a.name||b.name;if(!g)throw new Error("Name must be present in JSON or options");var h=new f(g),j=n({Array:Array,String:String,Number:Number,Boolean:Boolean,RegExp:RegExp,Date:Date,Object:Object},b.define||{});"undefined"!=typeof d&&(j.Buffer=d);var l=n({console:console},b.scope);i(a.define,function(a){j[a.name]=q(a)}),e(j).forEach(function(a,b){h.addDefined(b,a)});var o=e(a.scope).pluck("name").union(e(l).keys().value()).value(),p=k(m(j),function(a){return a});i(a.scope,function(a){l[a.name]=r(a.body,j,l,o,p)});var s=a.rules;return s.length&&i(s,function(a){h.__rules=h.__rules.concat(t(a,j,l))}),c&&c.call(h,h),h},c.transpile=a("./transpile").transpile},{"../constraintMatcher.js":8,"../extended":11,"../parser":31,"../rule":36,"./common":4,"./transpile":6,__browserify_Buffer:50}],6:[function(a,b,c){function d(a){a=l(a)?new Function("return "+a+";")():a;var b,c=["(function(){"];a.hasOwnProperty("constructor")&&"function"==typeof a.constructor?c.push("var Defined = "+a.constructor.toString()+";"):c.push("var Defined = function(opts){ for(var i in opts){if(opts.hasOwnProperty(i)){this[i] = opts[i];}}};"),c.push("var proto = Defined.prototype;");for(var d in a)a.hasOwnProperty(d)&&(b=a[d],c.push("proto."+d+" = "+(h.isFunction(b)?b.toString():h.format("%j",b))+";"));return c.push("return Defined;"),c.push("}())"),c.join("")}function e(a,b,c,d){var e=[];i(b,function(b){-1!==a.indexOf(b)&&e.push("var "+b+"= facts."+b+";")}),h(c).keys().forEach(function(b){-1!==a.indexOf(b)&&e.push("var "+b+"= defined."+b+";")}),h(d).keys().forEach(function(b){-1!==a.indexOf(b)&&e.push("var "+b+"= scope."+b+";")});var f=["facts","flow"];/next\(.*\)/.test(a)&&f.push("next"),a=e.join("")+a;try{return["function(",f.join(","),"){with(flow){",a,"}}"].join("")}catch(g){throw new Error("Invalid action : "+a+"\n"+g.message)}}function f(a,b){a=a.slice(0);var c=[];if("or"===a[0])return c.push('["'+a.shift()+'"'),c.push(h.map(a,function(a){return f(a,b)}).join(",")+"]"),c;if("not"===a[0]&&c.push('"',a.shift(),'", '),b.push(a[1]),c.push(a[0],', "'+a[1].replace(/"/g,'\\"')+'"'),a.splice(0,2),a.length){var d=a.shift();h.isString(d)?(c.push(',"'+d.replace(/"/g,'\\"'),'"'),i(m.getIdentifiers(n.parseConstraint(d)),function(a){b.push(a)})):(c.push(',"true"'),a.unshift(d))}if(a.length){var e=a.shift();h(e).values().forEach(function(a){-1===j(b,a)&&b.push(a)}),c.push(","+h.format("%j",[e]))}return"["+c.join("")+"]"}var g=a("__browserify_Buffer").Buffer,h=a("../extended"),i=h.forEach,j=h.indexOf,k=h.merge,l=h.isString,m=a("../constraintMatcher"),n=a("../parser");c.transpile=function(a,b){b=b||{};var c=[];c.push("(function(){"),c.push("return function(options){"),c.push("options = options || {};"),c.push("var bind = function(scope, fn){return function(){return fn.apply(scope, arguments);};}, defined = options.defined || {}, scope = options.scope || {};");var i=k({Array:Array,String:String,Number:Number,Boolean:Boolean,RegExp:RegExp,Date:Date,Object:Object},b.define||{});"undefined"!=typeof g&&(i.Buffer=g);var j=k({console:console},b.scope);return c.push(["return nools.flow('",b.name,"', function(){"].join("")),c.push(h(a.define||[]).map(function(a){var b=a.name;return a[b]={},["var",b,"= defined."+b,"= this.addDefined('"+b+"',",d(a.properties)+");"].join(" ")}).value().join("\n")),c.push(h(a.scope||[]).map(function(a){var b=a.name;return j[b]={},["var",b,"= scope."+b,"= ",a.body,";"].join(" 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19:[2,16],20:[2,16],21:[2,16],22:[2,16],24:[2,16],25:[2,16],26:[2,16],27:[2,16],34:[2,16],36:[2,16],46:[2,16]},{5:[2,17],17:[1,48],19:[2,17],20:[2,17],21:[2,17],22:[2,17],24:[2,17],25:[2,17],26:[2,17],27:[2,17],34:[2,17],36:[2,17],46:[2,17]},{5:[2,18],17:[1,48],19:[2,18],20:[2,18],21:[2,18],22:[2,18],24:[2,18],25:[2,18],26:[2,18],27:[2,18],34:[2,18],36:[2,18],46:[2,18]},{5:[2,37],8:[2,37],11:[2,37],12:[2,37],13:[2,37],15:[2,37],17:[2,37],19:[2,37],20:[2,37],21:[2,37],22:[2,37],24:[2,37],25:[2,37],26:[2,37],27:[2,37],29:[2,37],31:[2,37],34:[2,37],36:[2,37],38:[2,37],41:[2,37],42:[2,37],44:[2,37],45:[2,37],46:[2,37]},{44:[1,88]},{41:[1,44],42:[1,45],44:[1,89],45:[1,46]},{5:[2,40],8:[2,40],11:[2,40],12:[2,40],13:[2,40],15:[2,40],17:[2,40],19:[2,40],20:[2,40],21:[2,40],22:[2,40],24:[2,40],25:[2,40],26:[2,40],27:[2,40],29:[2,40],31:[2,40],34:[2,40],36:[2,40],38:[2,40],41:[2,40],42:[2,40],44:[2,40],45:[2,40],46:[2,40]},{38:[1,82],46:[1,90]},{5:[2,56],8:[2,56],11:[2,56],12:[2,56],13:[2,56],15:[2,56],17:[2,56],19:[2,56],20:[2,56],21:[2,56],22:[2,56],24:[2,56],25:[2,56],26:[2,56],27:[2,56],29:[2,56],31:[2,56],34:[2,56],36:[2,56],38:[2,56],44:[2,56],46:[2,56]},{5:[2,13],8:[1,53],15:[1,52],17:[2,13],19:[2,13],20:[2,13],21:[2,13],22:[2,13],24:[2,13],25:[2,13],26:[2,13],27:[2,13],34:[2,13],36:[2,13],46:[2,13]},{5:[2,48],8:[2,48],11:[2,48],12:[2,48],13:[2,48],15:[2,48],17:[2,48],19:[2,48],20:[2,48],21:[2,48],22:[2,48],24:[2,48],25:[2,48],26:[2,48],27:[2,48],29:[2,48],31:[2,48],34:[2,48],36:[2,48],38:[2,48],44:[2,48],46:[2,48]},{7:91,30:15,32:14,39:23,40:[1,26],42:[1,24],43:9,45:[1,16],47:[1,18],48:10,49:[1,19],50:11,51:[1,20],52:12,53:[1,21],54:13,55:[1,22]},{5:[2,10],8:[2,10],11:[1,54],12:[1,55],13:[1,56],15:[2,10],17:[2,10],19:[2,10],20:[2,10],21:[2,10],22:[2,10],24:[2,10],25:[2,10],26:[2,10],27:[2,10],34:[2,10],36:[2,10],46:[2,10]},{5:[2,11],8:[2,11],11:[1,54],12:[1,55],13:[1,56],15:[2,11],17:[2,11],19:[2,11],20:[2,11],21:[2,11],22:[2,11],24:[2,11],25:[2,11],26:[2,11],27:[2,11],34:[2,11],36:[2,11],46:[2,11]},{5:[2,6],8:[2,6],11:[2,6],12:[2,6],13:[2,6],15:[2,6],17:[2,6],19:[2,6],20:[2,6],21:[2,6],22:[2,6],24:[2,6],25:[2,6],26:[2,6],27:[2,6],34:[2,6],36:[2,6],46:[2,6]},{5:[2,7],8:[2,7],11:[2,7],12:[2,7],13:[2,7],15:[2,7],17:[2,7],19:[2,7],20:[2,7],21:[2,7],22:[2,7],24:[2,7],25:[2,7],26:[2,7],27:[2,7],34:[2,7],36:[2,7],46:[2,7]},{5:[2,8],8:[2,8],11:[2,8],12:[2,8],13:[2,8],15:[2,8],17:[2,8],19:[2,8],20:[2,8],21:[2,8],22:[2,8],24:[2,8],25:[2,8],26:[2,8],27:[2,8],34:[2,8],36:[2,8],46:[2,8]},{5:[2,38],8:[2,38],11:[2,38],12:[2,38],13:[2,38],15:[2,38],17:[2,38],19:[2,38],20:[2,38],21:[2,38],22:[2,38],24:[2,38],25:[2,38],26:[2,38],27:[2,38],29:[2,38],31:[2,38],34:[2,38],36:[2,38],38:[2,38],41:[2,38],42:[2,38],44:[2,38],45:[2,38],46:[2,38]},{5:[2,39],8:[2,39],11:[2,39],12:[2,39],13:[2,39],15:[2,39],17:[2,39],19:[2,39],20:[2,39],21:[2,39],22:[2,39],24:[2,39],25:[2,39],26:[2,39],27:[2,39],29:[2,39],31:[2,39],34:[2,39],36:[2,39],38:[2,39],41:[2,39],42:[2,39],44:[2,39],45:[2,39],46:[2,39]},{5:[2,41],8:[2,41],11:[2,41],12:[2,41],13:[2,41],15:[2,41],17:[2,41],19:[2,41],20:[2,41],21:[2,41],22:[2,41],24:[2,41],25:[2,41],26:[2,41],27:[2,41],29:[2,41],31:[2,41],34:[2,41],36:[2,41],38:[2,41],41:[2,41],42:[2,41],44:[2,41],45:[2,41],46:[2,41]},{38:[2,34],44:[2,34],46:[2,34]}],defaultActions:{31:[2,1]},parseError:function(a,b){if(!b.recoverable)throw new Error(a);this.trace(a)},parse:function(a){function b(){var a;return a=c.lexer.lex()||m,"number"!=typeof a&&(a=c.symbols_[a]||a),a}var c=this,d=[0],e=[null],f=[],g=this.table,h="",i=0,j=0,k=0,l=2,m=1;this.lexer.setInput(a),this.lexer.yy=this.yy,this.yy.lexer=this.lexer,this.yy.parser=this,"undefined"==typeof this.lexer.yylloc&&(this.lexer.yylloc={});var n=this.lexer.yylloc;f.push(n);var o=this.lexer.options&&this.lexer.options.ranges;this.parseError="function"==typeof this.yy.parseError?this.yy.parseError:Object.getPrototypeOf(this).parseError;for(var p,q,r,s,t,u,v,w,x,y={};;){if(r=d[d.length-1],this.defaultActions[r]?s=this.defaultActions[r]:((null===p||"undefined"==typeof p)&&(p=b()),s=g[r]&&g[r][p]),"undefined"==typeof s||!s.length||!s[0]){var z="";x=[];for(u in g[r])this.terminals_[u]&&u>l&&x.push("'"+this.terminals_[u]+"'");z=this.lexer.showPosition?"Parse error on line "+(i+1)+":\n"+this.lexer.showPosition()+"\nExpecting "+x.join(", ")+", got '"+(this.terminals_[p]||p)+"'":"Parse error on line "+(i+1)+": Unexpected "+(p==m?"end of input":"'"+(this.terminals_[p]||p)+"'"),this.parseError(z,{text:this.lexer.match,token:this.terminals_[p]||p,line:this.lexer.yylineno,loc:n,expected:x})}if(s[0]instanceof Array&&s.length>1)throw new Error("Parse Error: multiple actions possible at state: "+r+", token: "+p);switch(s[0]){case 1:d.push(p),e.push(this.lexer.yytext),f.push(this.lexer.yylloc),d.push(s[1]),p=null,q?(p=q,q=null):(j=this.lexer.yyleng,h=this.lexer.yytext,i=this.lexer.yylineno,n=this.lexer.yylloc,k>0&&k--);break;case 2:if(v=this.productions_[s[1]][1],y.$=e[e.length-v],y._$={first_line:f[f.length-(v||1)].first_line,last_line:f[f.length-1].last_line,first_column:f[f.length-(v||1)].first_column,last_column:f[f.length-1].last_column},o&&(y._$.range=[f[f.length-(v||1)].range[0],f[f.length-1].range[1]]),t=this.performAction.call(y,h,j,i,this.yy,s[1],e,f),"undefined"!=typeof t)return t;v&&(d=d.slice(0,2*-1*v),e=e.slice(0,-1*v),f=f.slice(0,-1*v)),d.push(this.productions_[s[1]][0]),e.push(y.$),f.push(y._$),w=g[d[d.length-2]][d[d.length-1]],d.push(w);break;case 3:return!0}}return!0}},c=function(){var a={EOF:1,parseError:function(a,b){if(!this.yy.parser)throw new Error(a);this.yy.parser.parseError(a,b)},setInput:function(a){return this._input=a,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},input:function(){var a=this._input[0];this.yytext+=a,this.yyleng++,this.offset++,this.match+=a,this.matched+=a;var b=a.match(/(?:\r\n?|\n).*/g);return b?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),a},unput:function(a){var b=a.length,c=a.split(/(?:\r\n?|\n)/g);this._input=a+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-b-1),this.offset-=b;var d=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),c.length-1&&(this.yylineno-=c.length-1);var e=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:c?(c.length===d.length?this.yylloc.first_column:0)+d[d.length-c.length].length-c[0].length:this.yylloc.first_column-b},this.options.ranges&&(this.yylloc.range=[e[0],e[0]+this.yyleng-b]),this.yyleng=this.yytext.length,this},more:function(){return this._more=!0,this},reject:function(){return this.options.backtrack_lexer?(this._backtrack=!0,this):this.parseError("Lexical error on line "+(this.yylineno+1)+". You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true).\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},less:function(a){this.unput(this.match.slice(a))},pastInput:function(){var a=this.matched.substr(0,this.matched.length-this.match.length);return(a.length>20?"...":"")+a.substr(-20).replace(/\n/g,"")},upcomingInput:function(){var a=this.match;return a.length<20&&(a+=this._input.substr(0,20-a.length)),(a.substr(0,20)+(a.length>20?"...":"")).replace(/\n/g,"")},showPosition:function(){var a=this.pastInput(),b=new Array(a.length+1).join("-");return a+this.upcomingInput()+"\n"+b+"^"},test_match:function(a,b){var c,d,e;if(this.options.backtrack_lexer&&(e={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(e.yylloc.range=this.yylloc.range.slice(0))),d=a[0].match(/(?:\r\n?|\n).*/g),d&&(this.yylineno+=d.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:d?d[d.length-1].length-d[d.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+a[0].length},this.yytext+=a[0],this.match+=a[0],this.matches=a,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(a[0].length),this.matched+=a[0],c=this.performAction.call(this,this.yy,this,b,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),c)return c;
-if(this._backtrack){for(var f in e)this[f]=e[f];return!1}return!1},next:function(){if(this.done)return this.EOF;this._input||(this.done=!0);var a,b,c,d;this._more||(this.yytext="",this.match="");for(var e=this._currentRules(),f=0;fb[0].length)){if(b=c,d=f,this.options.backtrack_lexer){if(a=this.test_match(c,e[f]),a!==!1)return a;if(this._backtrack){b=!1;continue}return!1}if(!this.options.flex)break}return b?(a=this.test_match(b,e[d]),a!==!1?a:!1):""===this._input?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+". Unrecognized text.\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},lex:function(){var a=this.next();return a?a:this.lex()},begin:function(a){this.conditionStack.push(a)},popState:function(){var a=this.conditionStack.length-1;return a>0?this.conditionStack.pop():this.conditionStack[0]},_currentRules:function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},topState:function(a){return a=this.conditionStack.length-1-Math.abs(a||0),a>=0?this.conditionStack[a]:"INITIAL"},pushState:function(a){this.begin(a)},stateStackSize:function(){return this.conditionStack.length},options:{},performAction:function(a,b,c,d){switch(c){case 0:return 29;case 1:return 31;case 2:return"from";case 3:return 24;case 4:return 25;case 5:return 21;case 6:return 19;case 7:return 22;case 8:return 20;case 9:return 26;case 10:return 27;case 11:return 34;case 12:return 36;case 13:return 55;case 14:return 53;case 15:break;case 16:return 49;case 17:return 47;case 18:return 47;case 19:return 40;case 20:return 51;case 21:return 41;case 22:return 11;case 23:return 12;case 24:return 13;case 25:return 38;case 26:return 8;case 27:return 26;case 28:return 27;case 29:return 24;case 30:return 24;case 31:return 25;case 32:return 25;case 33:return 21;case 34:return 22;case 35:return 20;case 36:return 19;case 37:return 34;case 38:return 36;case 39:return 15;case 40:return 17;case 41:return 45;case 42:return 44;case 43:return 42;case 44:return 46;case 45:return 9;case 46:return 5}},rules:[/^(?:\s+in\b)/,/^(?:\s+notIn\b)/,/^(?:\s+from\b)/,/^(?:\s+(eq|EQ)\b)/,/^(?:\s+(neq|NEQ)\b)/,/^(?:\s+(lte|LTE)\b)/,/^(?:\s+(lt|LT)\b)/,/^(?:\s+(gte|GTE)\b)/,/^(?:\s+(gt|GT)\b)/,/^(?:\s+(like|LIKE)\b)/,/^(?:\s+(notLike|NOT_LIKE)\b)/,/^(?:\s+(and|AND)\b)/,/^(?:\s+(or|OR)\b)/,/^(?:\s+null\b)/,/^(?:\s+(true|false)\b)/,/^(?:\s+)/,/^(?:-?[0-9]+(?:\.[0-9]+)?\b)/,/^(?:'[^']*')/,/^(?:"[^"]*")/,/^(?:([a-zA-Z_$][0-9a-zA-Z_$]*))/,/^(?:^\/((?![\s=])[^[\/\n\\]*(?:(?:\\[\s\S]|\[[^\]\n\\]*(?:\\[\s\S][^\]\n\\]*)*])[^[\/\n\\]*)*\/[imgy]{0,4})(?!\w))/,/^(?:\.)/,/^(?:\*)/,/^(?:\/)/,/^(?:\%)/,/^(?:,)/,/^(?:-)/,/^(?:=~)/,/^(?:!=~)/,/^(?:==)/,/^(?:===)/,/^(?:!=)/,/^(?:!==)/,/^(?:<=)/,/^(?:>=)/,/^(?:>)/,/^(?:<)/,/^(?:&&)/,/^(?:\|\|)/,/^(?:\+)/,/^(?:\^)/,/^(?:\()/,/^(?:\])/,/^(?:\[)/,/^(?:\))/,/^(?:!)/,/^(?:$)/],conditions:{INITIAL:{rules:[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46],inclusive:!0}}};return a}();return b.lexer=c,a.prototype=b,b.Parser=a,new a}();"undefined"!=typeof a&&"undefined"!=typeof c&&(c.parser=e,c.Parser=e.Parser,c.parse=function(){return e.parse.apply(e,arguments)},c.main=function(b){b[1]||(console.log("Usage: "+b[0]+" FILE"),d.exit(1));var e=a("fs").readFileSync(a("path").normalize(b[1]),"utf8");return c.parser.parse(e)},"undefined"!=typeof b&&a.main===b&&c.main(d.argv.slice(1)))},{__browserify_process:51,fs:48,path:49}],31:[function(a,b,c){!function(){"use strict";var b=a("./constraint/parser"),d=a("./nools/nool.parser");c.parseConstraint=function(a){try{return b.parse(a)}catch(c){throw new Error("Invalid expression '"+a+"'")}},c.parseRuleSet=function(a,b){return d.parse(a,b)}}()},{"./constraint/parser":30,"./nools/nool.parser":32}],32:[function(a,b,c){"use strict";var d=a("./tokens.js"),e=a("../../extended"),f=e.hash.keys,g=a("./util.js"),h=function(a,b,c){var d=a;a=a.replace(/\/\/(.*)[\n|\r|\r\n]/g,"").replace(/\n|\r|\r\n/g," ");for(var e,i=new RegExp("^("+f(b).join("|")+")");a&&-1!==(e=g.findNextTokenIndex(a));){a=a.substr(e);var j=a.match(i);if(null===j)throw new Error("Error parsing "+a);if(j=j[1],!(j in b))throw new Error("Unknown token"+j);try{a=b[j](a,c,h).replace(/^\s*|\s*$/g,"")}catch(k){throw new Error("Invalid "+j+" definition \n"+k.message+"; \nstarting at : "+d)}}};c.parse=function(a,b){var c={define:[],rules:[],scope:[],loaded:[],file:b};return h(a,d,c),c}},{"../../extended":11,"./tokens.js":33,"./util.js":34}],33:[function(require,module,exports){var process=require("__browserify_process"),utils=require("./util.js"),fs=require("fs"),indexOf=require("../../extended").indexOf,isWhiteSpace=function(a){return 0===a.replace(/[\s|\n|\r|\t]/g,"").length},ruleTokens={salience:function(){var a=/^(salience|priority)\s*:\s*(-?\d+)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=parseInt(d[2],10);if(isNaN(e))throw new Error("Invalid salience/priority "+d[2]);return c.options.priority=e,b.replace(d[0],"")}throw new Error("invalid format")}}(),agendaGroup:function(){var a=/^(agenda-group|agendaGroup)\s*:\s*([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid agenda-group "+d[2]);return c.options.agendaGroup=e.replace(/^["']|["']$/g,""),b.replace(d[0],"")}throw new Error("invalid format")}}(),autoFocus:function(){var a=/^(auto-focus|autoFocus)\s*:\s*(true|false)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid auto-focus "+d[2]);return c.options.autoFocus="true"===e?!0:!1,b.replace(d[0],"")}throw new Error("invalid format")}}(),"agenda-group":function(){return this.agendaGroup.apply(this,arguments)},"auto-focus":function(){return this.autoFocus.apply(this,arguments)},priority:function(){return this.salience.apply(this,arguments)},when:function(){var ruleRegExp=/^(\$?\w+) *: *(\w+)(.*)/,joinFunc=function(a,b){return"; "+b},constraintRegExp=/(\{ *(?:["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']? *(?:, *["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']?)*)+ *\})/,predicateExp=/^(\w+) *\((.*)\)$/m,parseRules=function(str){for(var rules=[],ruleLines=str.split(";"),l=ruleLines.length,ruleLine,i=0;l>i&&(ruleLine=ruleLines[i].replace(/^\s*|\s*$/g,"").replace(/\n/g,""));i++)if(!isWhiteSpace(ruleLine)){var rule=[];if(predicateExp.test(ruleLine)){var m=ruleLine.match(predicateExp),pred=m[1].replace(/^\s*|\s*$/g,"");if(rule.push(pred),ruleLine=m[2].replace(/^\s*|\s*$/g,""),"or"===pred){rule=rule.concat(parseRules(ruleLine.replace(/,\s*(\$?\w+\s*:)/g,joinFunc))),rules.push(rule);continue}}var parts=ruleLine.match(ruleRegExp);if(!parts||!parts.length)throw new Error("Invalid constraint "+ruleLine);rule.push(parts[2],parts[1]);var constraints=parts[3].replace(/^\s*|\s*$/g,""),hashParts=constraints.match(constraintRegExp);if(hashParts){var hash=hashParts[1],constraint=constraints.replace(hash,"");constraint&&rule.push(constraint.replace(/^\s*|\s*$/g,"")),hash&&rule.push(eval("("+hash.replace(/(\$?\w+)\s*:\s*(\$?\w+)/g,'"$1" : "$2"')+")"))}else constraints&&!isWhiteSpace(constraints)&&rule.push(constraints);rules.push(rule)}return rules};return function(a,b){var c=a.replace(/^when\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(d,""),b.constraints=parseRules(d.replace(/^\{\s*|\}\s*$/g,"")),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}(),then:function(){return function(a,b){if(b.action)throw new Error("action already defined for rule"+b.name);var c=a.replace(/^then\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");if(c=c.replace(d,""),b.action||(b.action=d.replace(/^\{\s*|\}\s*$/g,"")),!isWhiteSpace(c))throw new Error("Error parsing then block "+a);return c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}()},topLevelTokens={"/":function(a){return a.match(/^\/\*/)?a.replace(/\/\*.*?\*\//,""):a},define:function(a,b){var c=a.replace(/^define\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){d=d[1];var e=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(e,""),b.define.push({name:d,properties:"("+e+")"}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"import":function(a,b,c){if("undefined"!=typeof window)throw new Error("import cannot be used in a browser");var d=a.replace(/^import\s*/,"");if("("===utils.findNextToken(d)){var e=utils.getParamList(d);if(d=d.replace(e,"").replace(/^\s*|\s*$/g,""),";"===utils.findNextToken(d)&&(d=d.replace(/\s*;/,"")),e=e.replace(/[\(|\)]/g,"").split(","),1===e.length){if(e=utils.resolve(b.file||process.cwd(),e[0].replace(/["|']/g,"")),-1===indexOf(b.loaded,e)){var f=b.file;b.file=e,c(fs.readFileSync(e,"utf8"),topLevelTokens,b),b.loaded.push(e),b.file=f}return d}throw new Error("import accepts a single file")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(d)+"'")},global:function(a,b){var c=a.replace(/^global\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*\s*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"="===utils.findNextToken(c)){d=d[1].replace(/^\s+|\s+$/g,"");var e=utils.getTokensBetween(c,"=",";",!0).join(""),f=e.substring(1,e.length-1);if(f=f.replace(/^\s+|\s+$/g,""),/^require\(/.test(f)){var g=utils.getParamList(f.replace("require")).replace(/[\(|\)]/g,"").split(",");1===g.length&&(g=g[0].replace(/["|']/g,""),f=["require('",utils.resolve(b.file||process.cwd(),g),"')"].join(""))}return b.scope.push({name:d,body:f}),c=c.replace(e,"")}throw new Error("unexpected token : expected : '=' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"function":function(a,b){var c=a.replace(/^function\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)\s*/);if(d){if(c=c.replace(d[0],""),"("===utils.findNextToken(c)){d=d[1];var e=utils.getParamList(c);if(c=c.replace(e,"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){var f=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(f,""),b.scope.push({name:d,body:"function"+e+f}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},rule:function(a,b,c){var d=a.replace(/^rule\s*/,""),e=d.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')/);if(e){if(d=d.replace(e[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(d)){e=e[1].replace(/^["']|["']$/g,"");var f={name:e,options:{},constraints:null,action:null},g=utils.getTokensBetween(d,"{","}",!0).join("");return d=d.replace(g,""),c(g.replace(/^\{\s*|\}\s*$/g,""),ruleTokens,f),b.rules.push(f),d}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(d)+"'")}throw new Error("missing name")}};module.exports=topLevelTokens},{"../../extended":11,"./util.js":34,__browserify_process:51,fs:48}],34:[function(a,b,c){var d=a("__browserify_process"),e=a("path"),f=/[\s|\n|\r|\t]/,g=e.sep||("win32"===d.platform?"\\":"/"),h={"{":"}","}":"{","(":")",")":"(","[":"]"},i=c.getTokensBetween=function(a,b,c,d){var e=0,f=[];b||(b=h[c],e=1),c||(c=h[b]),a=Object(a);for(var g,i=!1,j=0,k=!1;g=a.charAt(j++);)if(g===b)e++,i?f.push(g):(i=!0,d&&f.push(g));else if(g===c&&j){if(e--,0===e){d&&f.push(g),k=!0;break}f.push(g)}else i&&f.push(g);if(!k)throw new Error("Unable to match "+b+" in "+a);return f};c.getParamList=function(a){return i(a,"(",")",!0).join("")},c.resolve=function(a,b){return""!==e.extname(a)&&(a=e.dirname(a)),1===b.split(g).length?b:e.resolve(a,b)};var j=c.findNextTokenIndex=function(a,b,c){b=b||0,c=c||a.length;var d=-1,e=a.length;for((!c||c>e)&&(c=e);c>b;b++){var g=a.charAt(b);if(!f.test(g)){d=b;break}}return d};c.findNextToken=function(a,b,c){return a.charAt(j(a,b,c))}},{__browserify_process:51,path:49}],35:[function(a,b,c){!function(){"use strict";var b=a("./extended"),d=b.merge,e=b.forEach,f=b.declare,g=a("./constraintMatcher"),h=a("./constraint"),i=f({}),j=i.extend({instance:{constructor:function(a,c,f,i,j){j=j||{},this.type=a,this.alias=c,this.conditions=f,this.pattern=j.pattern,this.constraints=[new h.ObjectConstraint(a)];var k=g.toConstraints(f,d({alias:c},j));if(k.length)this.constraints=this.constraints.concat(k);else{var l=new h.TrueConstraint;this.constraints.push(l)}if(i&&!b.isEmpty(i)){var m=new h.HashConstraint(i);this.constraints.push(m)}e(this.constraints,function(a){a.set("alias",c)})},hasConstraint:function(a){return b.some(this.constraints,function(b){return b instanceof a})},hashCode:function(){return[this.type,this.alias,b.format("%j",this.conditions)].join(":")},toString:function(){return b.format("%j",this.constraints)}}}).as(c,"ObjectPattern");j.extend().as(c,"NotPattern"),i.extend({instance:{constructor:function(a,b){this.leftPattern=a,this.rightPattern=b},hashCode:function(){return[this.leftPattern.hashCode(),this.rightPattern.hashCode()].join(":")},getters:{constraints:function(){return this.leftPattern.constraints.concat(this.rightPattern.constraints)}}}}).as(c,"CompositePattern");var k=f({}).as(c,"InitialFact");j.extend({instance:{constructor:function(){this._super([k,"i",[],{}])},assert:function(){return!0}}}).as(c,"InitialFactPattern")}()},{"./constraint":7,"./constraintMatcher":8,"./extended":11}],36:[function(a,b,c){"use strict";function d(a,b,c,d){e.isArray(b)?(d=c,c=b):b=b||{};var g=e.every(c,function(a){return f(a)});g&&1===c.length&&(c=c[0],g=!1);var h=[],i=b.scope||{};if(c.scope=i,g){for(var j,k=function(a,b){n[b]?e(n).forEach(function(b){b.push(a)}):(n[b]=0===b?[]:n[b-1].slice(),0!==b&&n[b].pop(),n[b].push(a))},l=c.length,n=[],o=0;l>o;o++)j=c[o],j.scope=i,e.forEach(p(j),k);h=e.map(n,function(c){for(var e=null,f=0;f>>0;if(0===d)return-1;var e=d;arguments.length>2&&(e=Number(arguments[2]),e!==e?e=0:0!==e&&e!==1/0&&e!==-(1/0)&&(e=(e>0||-1)*P(Q(e))));for(var f=e>=0?R(e,d-1):d-Q(e);f>=0;f--)if(f in c&&c[f]===b)return f;return-1}function i(a,b,c){if(a&&X&&X===a.filter)return a.filter(b,c);if(!N(a)||"function"!=typeof b)throw new TypeError;for(var 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0;if(0>b||b>=a.length)throw new Error("targetStart out of bounds");if(0>c||c>=e.length)throw new Error("sourceStart out of bounds");if(0>d||d>e.length)throw new Error("sourceEnd out of bounds");return d>this.length&&(d=this.length),a.length-bthis.length)throw new Error("oob");if(a>b)throw new Error("oob");return new l(this.parent,b-a,+a+this.offset)},l.prototype.utf8Slice=function(a,b){return this.toString("utf8",a,b)},l.prototype.binarySlice=function(a,b){return this.toString("binary",a,b)},l.prototype.asciiSlice=function(a,b){return this.toString("ascii",a,b)},l.prototype.utf8Write=function(a,b){return this.write(a,b,"utf8")},l.prototype.binaryWrite=function(a,b){return this.write(a,b,"binary")},l.prototype.asciiWrite=function(a,b){return this.write(a,b,"ascii")},l.prototype.readUInt8=function(a,b){var c=this;return b||(D.ok(void 0!==a&&null!==a,"missing 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b=this.removeFromLeftMemory(a);b&&(b=b.data,b.blocked||this.__propagate("retract",b.clone()))},__modify:function(a,b){var c=b.blocked,d=a.factHash,e=this.plucker(d);if(l(e)){for(var f=0,g=e.length;g>f;f++)if(this.__isMatch(a,e[f],!0)){a.blocked=!0;break}}else a.blocked=this.__isMatch(a,e,!0);var h=a.blocked;h?c||this.__propagate("retract",b.clone()):c?this.__propagate("assert",a.clone()):this.__propagate("modify",a.clone())},modifyLeft:function(a){var b=this.removeFromLeftMemory(a);if(!b)throw new Error;this.__addToLeftMemory(a),this.__modify(a,b.data);var c=this.fromMemory[a.fact.id];if(this.fromMemory[a.fact.id]={},c)for(var d in c)if(d!==a.hashCode){var e=c[d];b=this.removeFromLeftMemory(e),b&&(e=e.clone(),e.blocked=!1,this.__addToLeftMemory(e),this.__modify(e,b.data))}},__findMatches:function(a){var b=a.factHash,c=this.plucker(b),d=!1;if(l(c)){for(var e=0,f=c.length;f>e;e++)if(this.__isMatch(a,c[e],!0))return a.blocked=!0,void 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d=a("../extended"),e=d.forEach,f=d.some,g=d.declare,h=a("../pattern.js"),i=h.ObjectPattern,j=h.FromPattern,k=h.FromNotPattern,l=h.NotPattern,m=h.CompositePattern,n=h.InitialFactPattern,o=a("../constraint"),p=o.HashConstraint,q=o.ReferenceConstraint,r=a("./aliasNode"),s=a("./equalityNode"),t=a("./joinNode"),u=a("./notNode"),v=a("./fromNode"),w=a("./fromNotNode"),x=a("./leftAdapterNode"),y=a("./rightAdapterNode"),z=a("./typeNode"),A=a("./terminalNode"),B=a("./propertyNode");g({instance:{constructor:function(a,b){this.terminalNodes=[],this.joinNodes=[],this.nodes=[],this.constraints=[],this.typeNodes=[],this.__ruleCount=0,this.bucket={counter:0,recency:0},this.agendaTree=b,this.workingMemory=a},assertRule:function(a){var b=new 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this.__checkEqual(new s(b)).addRule(a)},__createPropertyNode:function(a,b){return this.__checkEqual(new B(b)).addRule(a)},__createAliasNode:function(a,b){return this.__checkEqual(new r(b)).addRule(a)},__createAdapterNode:function(a,b){return("left"===b?new x:new y).addRule(a)},__createJoinNode:function(a,b,c,d){var e;b.rightPattern instanceof l?e=new u:b.rightPattern instanceof k?e=new w(b.rightPattern,this.workingMemory):b.rightPattern instanceof j?e=new v(b.rightPattern,this.workingMemory):(e=new t,this.joinNodes.push(e)),e.__rule__=a;var f=e;if(c instanceof t){var g=this.__createAdapterNode(a,d);f.addOutNode(g,b),f=g}return f.addOutNode(c,b),e.addRule(a)},__addToNetwork:function(a,b,c,d){b instanceof i?!(b instanceof l||b instanceof j||b instanceof k)||d&&"left"!==d?this.__createAlphaNode(a,b,c,d):b instanceof k?this.__createBetaNode(a,new m(new n,b),c,d):this.__createBetaNode(a,new m(new n,b),c,d):b instanceof 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e,f,g,h=this.rightTuples,i=this.constraint,j={next:d.head},k=h.length;j=j.next;){if(e=j.data,this.removeFromLeftBlockedMemory(e),0!==k){for(i.setLeftContext(e),f=b;f=f.next;)if(i.setRightContext(g=f.data).isMatch()){e.blocker=g,this.addToLeftBlockedMemory(g.blocking.push(e)),e=null;break}i.clearContexts()}e&&(this.__addToLeftMemory(e),this.__propagate("assert",e.clone()))}d.clear()}},retractLeft:function(a){var b=this.removeFromLeftMemory(a);if(b)this.__propagate("retract",b.data.clone());else if(!this.removeFromLeftBlockedMemory(a))throw new Error},assertLeft:function(a){var b,c,d=this.rightTuples,e=this.constraint;if(d.length){for(b={next:d.head},e.setLeftContext(a);(b=b.next)&&a;)e.setRightContext(c=b.data).isMatch()&&(a.blocker=c,this.addToLeftBlockedMemory(c.blocking.push(a)),a=null);e.clearContexts()}a&&(this.__addToLeftMemory(a),this.__propagate("assert",a.clone()))},assertRight:function(a){this.__addToRightMemory(a),a.blocking=new d;var b,c,e=this.leftTuples,f=this.constraint;if(e.length){for(c={next:e.head},f.setRightContext(a);c=c.next;)b=c.data,f.setLeftContext(b).isMatch()&&(this.__propagate("retract",b.clone()),this.removeFromLeftMemory(b),b.blocker=a,this.addToLeftBlockedMemory(a.blocking.push(b)));f.clearContexts()}},addToLeftBlockedMemory:function(a){var b=a.data,c=b.hashCode,d=this.leftMemory[c];return this.leftTupleMemory[c]=a,d&&this.leftTuples.remove(d),this},removeFromLeftBlockedMemory:function(a){var b=this.leftTupleMemory[a.hashCode]||null;return b&&(delete this.leftTupleMemory[a.hashCode],b.data.blocker.blocking.remove(b)),b},modifyLeft:function(a){var b,c,d,e,f=this.removeFromLeftMemory(a),g=this.constraint,h=this.rightTuples,i=h.length,j=!1;if(f||(f=this.removeFromLeftBlockedMemory(a),j=!0),!f)throw new Error;if(b=f.data,b&&b.blocker&&(e=this.rightMemory[b.blocker.hashCode]),e&&(g.setLeftContext(a),g.setRightContext(d=e.data).isMatch()&&(j||this.__propagate("retract",b.clone()),a.blocker=d,this.addToLeftBlockedMemory(d.blocking.push(a)),a=null)),a&&i){for(c={next:h.head},g.setLeftContext(a);c=c.next;)if(g.setRightContext(d=c.data).isMatch()){j||this.__propagate("retract",b.clone()),this.addToLeftBlockedMemory(d.blocking.push(a)),a.blocker=d,a=null;break}g.clearContexts()}a&&(this.__addToLeftMemory(a),j?this.__propagate("assert",a.clone()):this.__propagate("modify",a.clone()))},modifyRight:function(a){var b=this.removeFromRightMemory(a);if(!b)throw new Error;var c,e,f=b.data,g=this.leftTuples,h=g.length,i=this.constraint,j=f.blocking;if(this.__addToRightMemory(a),a.blocking=new 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2,16],17:[1,48],19:[2,16],20:[2,16],21:[2,16],22:[2,16],24:[2,16],25:[2,16],26:[2,16],27:[2,16],34:[2,16],36:[2,16],47:[2,16]},{5:[2,17],17:[1,48],19:[2,17],20:[2,17],21:[2,17],22:[2,17],24:[2,17],25:[2,17],26:[2,17],27:[2,17],34:[2,17],36:[2,17],47:[2,17]},{5:[2,18],17:[1,48],19:[2,18],20:[2,18],21:[2,18],22:[2,18],24:[2,18],25:[2,18],26:[2,18],27:[2,18],34:[2,18],36:[2,18],47:[2,18]},{5:[2,37],8:[2,37],11:[2,37],12:[2,37],13:[2,37],15:[2,37],17:[2,37],19:[2,37],20:[2,37],21:[2,37],22:[2,37],24:[2,37],25:[2,37],26:[2,37],27:[2,37],29:[2,37],31:[2,37],34:[2,37],36:[2,37],38:[2,37],41:[2,37],42:[2,37],44:[2,37],46:[2,37],47:[2,37]},{44:[1,89]},{44:[1,90]},{41:[1,44],42:[1,45],44:[1,91],46:[1,46]},{5:[2,41],8:[2,41],11:[2,41],12:[2,41],13:[2,41],15:[2,41],17:[2,41],19:[2,41],20:[2,41],21:[2,41],22:[2,41],24:[2,41],25:[2,41],26:[2,41],27:[2,41],29:[2,41],31:[2,41],34:[2,41],36:[2,41],38:[2,41],41:[2,41],42:[2,41],44:[2,41],46:[2,41],47:[2,41]},{38:[1,83],47:[1,92]},{5:[2,57],8:[2,57],11:[2,57],12:[2,57],13:[2,57],15:[2,57],17:[2,57],19:[2,57],20:[2,57],21:[2,57],22:[2,57],24:[2,57],25:[2,57],26:[2,57],27:[2,57],29:[2,57],31:[2,57],34:[2,57],36:[2,57],38:[2,57],44:[2,57],47:[2,57]},{5:[2,13],8:[1,53],15:[1,52],17:[2,13],19:[2,13],20:[2,13],21:[2,13],22:[2,13],24:[2,13],25:[2,13],26:[2,13],27:[2,13],34:[2,13],36:[2,13],47:[2,13]},{5:[2,49],8:[2,49],11:[2,49],12:[2,49],13:[2,49],15:[2,49],17:[2,49],19:[2,49],20:[2,49],21:[2,49],22:[2,49],24:[2,49],25:[2,49],26:[2,49],27:[2,49],29:[2,49],31:[2,49],34:[2,49],36:[2,49],38:[2,49],44:[2,49],47:[2,49]},{7:93,30:15,32:14,39:23,40:[1,26],42:[1,24],43:9,45:10,46:[1,16],48:[1,18],49:[1,19],50:11,51:[1,20],52:12,53:[1,21],54:13,55:[1,22]},{5:[2,10],8:[2,10],11:[1,54],12:[1,55],13:[1,56],15:[2,10],17:[2,10],19:[2,10],20:[2,10],21:[2,10],22:[2,10],24:[2,10],25:[2,10],26:[2,10],27:[2,10],34:[2,10],36:[2,10],47:[2,10]},{5:[2,11],8:[2,11],11:[1,54],12:[1,55],13:[1,56],15:[2,11],17:[2,11],19:[2,11],20:[2,11],21:[2,11],22:[2,11],24:[2,11],25:[2,11],26:[2,11],27:[2,11],34:[2,11],36:[2,11],47:[2,11]},{5:[2,6],8:[2,6],11:[2,6],12:[2,6],13:[2,6],15:[2,6],17:[2,6],19:[2,6],20:[2,6],21:[2,6],22:[2,6],24:[2,6],25:[2,6],26:[2,6],27:[2,6],34:[2,6],36:[2,6],47:[2,6]},{5:[2,7],8:[2,7],11:[2,7],12:[2,7],13:[2,7],15:[2,7],17:[2,7],19:[2,7],20:[2,7],21:[2,7],22:[2,7],24:[2,7],25:[2,7],26:[2,7],27:[2,7],34:[2,7],36:[2,7],47:[2,7]},{5:[2,8],8:[2,8],11:[2,8],12:[2,8],13:[2,8],15:[2,8],17:[2,8],19:[2,8],20:[2,8],21:[2,8],22:[2,8],24:[2,8],25:[2,8],26:[2,8],27:[2,8],34:[2,8],36:[2,8],47:[2,8]},{5:[2,38],8:[2,38],11:[2,38],12:[2,38],13:[2,38],15:[2,38],17:[2,38],19:[2,38],20:[2,38],21:[2,38],22:[2,38],24:[2,38],25:[2,38],26:[2,38],27:[2,38],29:[2,38],31:[2,38],34:[2,38],36:[2,38],38:[2,38],41:[2,38],42:[2,38],44:[2,38],46:[2,38],47:[2,38]},{5:[2,39],8:[2,39],11:[2,39],12:[2,39],13:[2,39],15:[2,39],17:[2,39],19:[2,39],20:[2,39],21:[2,39],22:[2,39],24:[2,39],25:[2,39],26:[2,39],27:[2,39],29:[2,39],31:[2,39],34:[2,39],36:[2,39],38:[2,39],41:[2,39],42:[2,39],44:[2,39],46:[2,39],47:[2,39]},{5:[2,40],8:[2,40],11:[2,40],12:[2,40],13:[2,40],15:[2,40],17:[2,40],19:[2,40],20:[2,40],21:[2,40],22:[2,40],24:[2,40],25:[2,40],26:[2,40],27:[2,40],29:[2,40],31:[2,40],34:[2,40],36:[2,40],38:[2,40],41:[2,40],42:[2,40],44:[2,40],46:[2,40],47:[2,40]},{5:[2,42],8:[2,42],11:[2,42],12:[2,42],13:[2,42],15:[2,42],17:[2,42],19:[2,42],20:[2,42],21:[2,42],22:[2,42],24:[2,42],25:[2,42],26:[2,42],27:[2,42],29:[2,42],31:[2,42],34:[2,42],36:[2,42],38:[2,42],41:[2,42],42:[2,42],44:[2,42],46:[2,42],47:[2,42]},{38:[2,34],44:[2,34],47:[2,34]}],defaultActions:{31:[2,1]},parseError:function(a,b){if(!b.recoverable)throw new Error(a);
+this.trace(a)},parse:function(a){function b(){var a;return a=c.lexer.lex()||m,"number"!=typeof a&&(a=c.symbols_[a]||a),a}var c=this,d=[0],e=[null],f=[],g=this.table,h="",i=0,j=0,k=0,l=2,m=1;this.lexer.setInput(a),this.lexer.yy=this.yy,this.yy.lexer=this.lexer,this.yy.parser=this,"undefined"==typeof this.lexer.yylloc&&(this.lexer.yylloc={});var n=this.lexer.yylloc;f.push(n);var o=this.lexer.options&&this.lexer.options.ranges;this.parseError="function"==typeof this.yy.parseError?this.yy.parseError:Object.getPrototypeOf(this).parseError;for(var p,q,r,s,t,u,v,w,x,y={};;){if(r=d[d.length-1],this.defaultActions[r]?s=this.defaultActions[r]:((null===p||"undefined"==typeof p)&&(p=b()),s=g[r]&&g[r][p]),"undefined"==typeof s||!s.length||!s[0]){var z="";x=[];for(u in g[r])this.terminals_[u]&&u>l&&x.push("'"+this.terminals_[u]+"'");z=this.lexer.showPosition?"Parse error on line "+(i+1)+":\n"+this.lexer.showPosition()+"\nExpecting "+x.join(", ")+", got '"+(this.terminals_[p]||p)+"'":"Parse error on line "+(i+1)+": Unexpected "+(p==m?"end of input":"'"+(this.terminals_[p]||p)+"'"),this.parseError(z,{text:this.lexer.match,token:this.terminals_[p]||p,line:this.lexer.yylineno,loc:n,expected:x})}if(s[0]instanceof Array&&s.length>1)throw new Error("Parse Error: multiple actions possible at state: "+r+", token: "+p);switch(s[0]){case 1:d.push(p),e.push(this.lexer.yytext),f.push(this.lexer.yylloc),d.push(s[1]),p=null,q?(p=q,q=null):(j=this.lexer.yyleng,h=this.lexer.yytext,i=this.lexer.yylineno,n=this.lexer.yylloc,k>0&&k--);break;case 2:if(v=this.productions_[s[1]][1],y.$=e[e.length-v],y._$={first_line:f[f.length-(v||1)].first_line,last_line:f[f.length-1].last_line,first_column:f[f.length-(v||1)].first_column,last_column:f[f.length-1].last_column},o&&(y._$.range=[f[f.length-(v||1)].range[0],f[f.length-1].range[1]]),t=this.performAction.call(y,h,j,i,this.yy,s[1],e,f),"undefined"!=typeof t)return t;v&&(d=d.slice(0,2*-1*v),e=e.slice(0,-1*v),f=f.slice(0,-1*v)),d.push(this.productions_[s[1]][0]),e.push(y.$),f.push(y._$),w=g[d[d.length-2]][d[d.length-1]],d.push(w);break;case 3:return!0}}return!0}},c=function(){var a={EOF:1,parseError:function(a,b){if(!this.yy.parser)throw new Error(a);this.yy.parser.parseError(a,b)},setInput:function(a){return this._input=a,this._more=this._backtrack=this.done=!1,this.yylineno=this.yyleng=0,this.yytext=this.matched=this.match="",this.conditionStack=["INITIAL"],this.yylloc={first_line:1,first_column:0,last_line:1,last_column:0},this.options.ranges&&(this.yylloc.range=[0,0]),this.offset=0,this},input:function(){var a=this._input[0];this.yytext+=a,this.yyleng++,this.offset++,this.match+=a,this.matched+=a;var b=a.match(/(?:\r\n?|\n).*/g);return b?(this.yylineno++,this.yylloc.last_line++):this.yylloc.last_column++,this.options.ranges&&this.yylloc.range[1]++,this._input=this._input.slice(1),a},unput:function(a){var b=a.length,c=a.split(/(?:\r\n?|\n)/g);this._input=a+this._input,this.yytext=this.yytext.substr(0,this.yytext.length-b-1),this.offset-=b;var d=this.match.split(/(?:\r\n?|\n)/g);this.match=this.match.substr(0,this.match.length-1),this.matched=this.matched.substr(0,this.matched.length-1),c.length-1&&(this.yylineno-=c.length-1);var e=this.yylloc.range;return this.yylloc={first_line:this.yylloc.first_line,last_line:this.yylineno+1,first_column:this.yylloc.first_column,last_column:c?(c.length===d.length?this.yylloc.first_column:0)+d[d.length-c.length].length-c[0].length:this.yylloc.first_column-b},this.options.ranges&&(this.yylloc.range=[e[0],e[0]+this.yyleng-b]),this.yyleng=this.yytext.length,this},more:function(){return this._more=!0,this},reject:function(){return this.options.backtrack_lexer?(this._backtrack=!0,this):this.parseError("Lexical error on line "+(this.yylineno+1)+". You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true).\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},less:function(a){this.unput(this.match.slice(a))},pastInput:function(){var a=this.matched.substr(0,this.matched.length-this.match.length);return(a.length>20?"...":"")+a.substr(-20).replace(/\n/g,"")},upcomingInput:function(){var a=this.match;return a.length<20&&(a+=this._input.substr(0,20-a.length)),(a.substr(0,20)+(a.length>20?"...":"")).replace(/\n/g,"")},showPosition:function(){var a=this.pastInput(),b=new Array(a.length+1).join("-");return a+this.upcomingInput()+"\n"+b+"^"},test_match:function(a,b){var c,d,e;if(this.options.backtrack_lexer&&(e={yylineno:this.yylineno,yylloc:{first_line:this.yylloc.first_line,last_line:this.last_line,first_column:this.yylloc.first_column,last_column:this.yylloc.last_column},yytext:this.yytext,match:this.match,matches:this.matches,matched:this.matched,yyleng:this.yyleng,offset:this.offset,_more:this._more,_input:this._input,yy:this.yy,conditionStack:this.conditionStack.slice(0),done:this.done},this.options.ranges&&(e.yylloc.range=this.yylloc.range.slice(0))),d=a[0].match(/(?:\r\n?|\n).*/g),d&&(this.yylineno+=d.length),this.yylloc={first_line:this.yylloc.last_line,last_line:this.yylineno+1,first_column:this.yylloc.last_column,last_column:d?d[d.length-1].length-d[d.length-1].match(/\r?\n?/)[0].length:this.yylloc.last_column+a[0].length},this.yytext+=a[0],this.match+=a[0],this.matches=a,this.yyleng=this.yytext.length,this.options.ranges&&(this.yylloc.range=[this.offset,this.offset+=this.yyleng]),this._more=!1,this._backtrack=!1,this._input=this._input.slice(a[0].length),this.matched+=a[0],c=this.performAction.call(this,this.yy,this,b,this.conditionStack[this.conditionStack.length-1]),this.done&&this._input&&(this.done=!1),c)return c;if(this._backtrack){for(var f in e)this[f]=e[f];return!1}return!1},next:function(){if(this.done)return this.EOF;this._input||(this.done=!0);var a,b,c,d;this._more||(this.yytext="",this.match="");for(var e=this._currentRules(),f=0;fb[0].length)){if(b=c,d=f,this.options.backtrack_lexer){if(a=this.test_match(c,e[f]),a!==!1)return a;if(this._backtrack){b=!1;continue}return!1}if(!this.options.flex)break}return b?(a=this.test_match(b,e[d]),a!==!1?a:!1):""===this._input?this.EOF:this.parseError("Lexical error on line "+(this.yylineno+1)+". Unrecognized text.\n"+this.showPosition(),{text:"",token:null,line:this.yylineno})},lex:function(){var a=this.next();return a?a:this.lex()},begin:function(a){this.conditionStack.push(a)},popState:function(){var a=this.conditionStack.length-1;return a>0?this.conditionStack.pop():this.conditionStack[0]},_currentRules:function(){return this.conditionStack.length&&this.conditionStack[this.conditionStack.length-1]?this.conditions[this.conditionStack[this.conditionStack.length-1]].rules:this.conditions.INITIAL.rules},topState:function(a){return a=this.conditionStack.length-1-Math.abs(a||0),a>=0?this.conditionStack[a]:"INITIAL"},pushState:function(a){this.begin(a)},stateStackSize:function(){return this.conditionStack.length},options:{},performAction:function(a,b,c,d){switch(c){case 0:return 29;case 1:return 31;case 2:return"from";case 3:return 24;case 4:return 25;case 5:return 21;case 6:return 19;case 7:return 22;case 8:return 20;case 9:return 26;case 10:return 27;case 11:return 34;case 12:return 36;case 13:return 55;case 14:return 53;case 15:break;case 16:return 49;case 17:return 48;case 18:return 48;case 19:return 40;case 20:return 51;case 21:return 41;case 22:return 11;case 23:return 12;case 24:return 13;case 25:return 38;case 26:return 8;case 27:return 26;case 28:return 27;case 29:return 24;case 30:return 24;case 31:return 25;case 32:return 25;case 33:return 21;case 34:return 22;case 35:return 20;case 36:return 19;case 37:return 34;case 38:return 36;case 39:return 15;case 40:return 17;case 41:return 46;case 42:return 44;case 43:return 42;case 44:return 47;case 45:return 9;case 46:return 5}},rules:[/^(?:\s+in\b)/,/^(?:\s+notIn\b)/,/^(?:\s+from\b)/,/^(?:\s+(eq|EQ)\b)/,/^(?:\s+(neq|NEQ)\b)/,/^(?:\s+(lte|LTE)\b)/,/^(?:\s+(lt|LT)\b)/,/^(?:\s+(gte|GTE)\b)/,/^(?:\s+(gt|GT)\b)/,/^(?:\s+(like|LIKE)\b)/,/^(?:\s+(notLike|NOT_LIKE)\b)/,/^(?:\s+(and|AND)\b)/,/^(?:\s+(or|OR)\b)/,/^(?:\s+null\b)/,/^(?:\s+(true|false)\b)/,/^(?:\s+)/,/^(?:-?[0-9]+(?:\.[0-9]+)?\b)/,/^(?:'[^']*')/,/^(?:"[^"]*")/,/^(?:([a-zA-Z_$][0-9a-zA-Z_$]*))/,/^(?:^\/((?![\s=])[^[\/\n\\]*(?:(?:\\[\s\S]|\[[^\]\n\\]*(?:\\[\s\S][^\]\n\\]*)*])[^[\/\n\\]*)*\/[imgy]{0,4})(?!\w))/,/^(?:\.)/,/^(?:\*)/,/^(?:\/)/,/^(?:\%)/,/^(?:,)/,/^(?:-)/,/^(?:=~)/,/^(?:!=~)/,/^(?:==)/,/^(?:===)/,/^(?:!=)/,/^(?:!==)/,/^(?:<=)/,/^(?:>=)/,/^(?:>)/,/^(?:<)/,/^(?:&&)/,/^(?:\|\|)/,/^(?:\+)/,/^(?:\^)/,/^(?:\()/,/^(?:\])/,/^(?:\[)/,/^(?:\))/,/^(?:!)/,/^(?:$)/],conditions:{INITIAL:{rules:[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46],inclusive:!0}}};return a}();return b.lexer=c,a.prototype=b,b.Parser=a,new a}();"undefined"!=typeof a&&"undefined"!=typeof c&&(c.parser=e,c.Parser=e.Parser,c.parse=function(){return e.parse.apply(e,arguments)},c.main=function(b){b[1]||(console.log("Usage: "+b[0]+" FILE"),d.exit(1));var e=a("fs").readFileSync(a("path").normalize(b[1]),"utf8");return c.parser.parse(e)},"undefined"!=typeof b&&a.main===b&&c.main(d.argv.slice(1)))},{__browserify_process:54,fs:51,path:52}],34:[function(a,b,c){!function(){"use strict";var b=a("./constraint/parser"),d=a("./nools/nool.parser");c.parseConstraint=function(a){try{return b.parse(a)}catch(c){throw new Error("Invalid expression '"+a+"'")}},c.parseRuleSet=function(a,b){return d.parse(a,b)}}()},{"./constraint/parser":33,"./nools/nool.parser":35}],35:[function(a,b,c){"use strict";var d=a("./tokens.js"),e=a("../../extended"),f=e.hash.keys,g=a("./util.js"),h=function(a,b,c){var d=a;a=a.replace(/\/\/(.*)/g,"").replace(/\n|\r|\r\n/g," ");for(var e,i=new RegExp("^("+f(b).join("|")+")");a&&-1!==(e=g.findNextTokenIndex(a));){a=a.substr(e);var j=a.match(i);if(null===j)throw new Error("Error parsing "+a);if(j=j[1],!(j in b))throw new Error("Unknown token"+j);try{a=b[j](a,c,h).replace(/^\s*|\s*$/g,"")}catch(k){throw new Error("Invalid "+j+" definition \n"+k.message+"; \nstarting at : "+d)}}};c.parse=function(a,b){var c={define:[],rules:[],scope:[],loaded:[],file:b};return h(a,d,c),c}},{"../../extended":12,"./tokens.js":36,"./util.js":37}],36:[function(require,module,exports){var process=require("__browserify_process"),utils=require("./util.js"),fs=require("fs"),indexOf=require("../../extended").indexOf,isWhiteSpace=function(a){return 0===a.replace(/[\s|\n|\r|\t]/g,"").length},ruleTokens={salience:function(){var a=/^(salience|priority)\s*:\s*(-?\d+)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=parseInt(d[2],10);if(isNaN(e))throw new Error("Invalid salience/priority "+d[2]);return c.options.priority=e,b.replace(d[0],"")}throw new Error("invalid format")}}(),agendaGroup:function(){var a=/^(agenda-group|agendaGroup)\s*:\s*([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid agenda-group "+d[2]);return c.options.agendaGroup=e.replace(/^["']|["']$/g,""),b.replace(d[0],"")}throw new Error("invalid format")}}(),autoFocus:function(){var a=/^(auto-focus|autoFocus)\s*:\s*(true|false)\s*[,;]?/;return function(b,c){if(a.test(b)){var d=b.match(a),e=d[2];if(!e)throw new Error("Invalid auto-focus "+d[2]);return c.options.autoFocus="true"===e?!0:!1,b.replace(d[0],"")}throw new Error("invalid format")}}(),"agenda-group":function(){return this.agendaGroup.apply(this,arguments)},"auto-focus":function(){return this.autoFocus.apply(this,arguments)},priority:function(){return this.salience.apply(this,arguments)},when:function(){var ruleRegExp=/^(\$?\w+) *: *(\w+)(.*)/,joinFunc=function(a,b){return"; "+b},constraintRegExp=/(\{ *(?:["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']? *(?:, *["']?\$?\w+["']?\s*:\s*["']?\$?\w+["']?)*)+ *\})/,predicateExp=/^(\w+) *\((.*)\)$/m,fromRegExp=/(\bfrom\s+.*)/,parseRules=function(str){for(var rules=[],ruleLines=str.split(";"),l=ruleLines.length,ruleLine,i=0;l>i&&(ruleLine=ruleLines[i].replace(/^\s*|\s*$/g,"").replace(/\n/g,""));i++)if(!isWhiteSpace(ruleLine)){var rule=[];if(predicateExp.test(ruleLine)){var m=ruleLine.match(predicateExp),pred=m[1].replace(/^\s*|\s*$/g,"");if(rule.push(pred),ruleLine=m[2].replace(/^\s*|\s*$/g,""),"or"===pred){rule=rule.concat(parseRules(ruleLine.replace(/,\s*(\$?\w+\s*:)/g,joinFunc))),rules.push(rule);continue}}var parts=ruleLine.match(ruleRegExp);if(!parts||!parts.length)throw new Error("Invalid constraint "+ruleLine);rule.push(parts[2],parts[1]);var constraints=parts[3].replace(/^\s*|\s*$/g,""),hashParts=constraints.match(constraintRegExp),from=null,fromMatch;if(hashParts){var hash=hashParts[1],constraint=constraints.replace(hash,"");fromRegExp.test(constraint)&&(fromMatch=constraint.match(fromRegExp),from=fromMatch[0],constraint=constraint.replace(fromMatch[0],"")),constraint&&rule.push(constraint.replace(/^\s*|\s*$/g,"")),hash&&rule.push(eval("("+hash.replace(/(\$?\w+)\s*:\s*(\$?\w+)/g,'"$1" : "$2"')+")"))}else constraints&&!isWhiteSpace(constraints)&&(fromRegExp.test(constraints)&&(fromMatch=constraints.match(fromRegExp),from=fromMatch[0],constraints=constraints.replace(fromMatch[0],"")),rule.push(constraints));from&&rule.push(from),rules.push(rule)}return rules};return function(a,b){var c=a.replace(/^when\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(d,""),b.constraints=parseRules(d.replace(/^\{\s*|\}\s*$/g,"")),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}(),then:function(){return function(a,b){if(b.action)throw new Error("action already defined for rule"+b.name);var c=a.replace(/^then\s*/,"").replace(/^\s*|\s*$/g,"");if("{"===utils.findNextToken(c)){var d=utils.getTokensBetween(c,"{","}",!0).join("");if(c=c.replace(d,""),b.action||(b.action=d.replace(/^\{\s*|\}\s*$/g,"")),!isWhiteSpace(c))throw new Error("Error parsing then block "+a);return c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}}()},topLevelTokens={"/":function(a){return a.match(/^\/\*/)?a.replace(/\/\*.*?\*\//,""):a},define:function(a,b){var c=a.replace(/^define\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){d=d[1];var e=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(e,""),b.define.push({name:d,properties:"("+e+")"}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"import":function(a,b,c){if("undefined"!=typeof window)throw new Error("import cannot be used in a browser");var d=a.replace(/^import\s*/,"");if("("===utils.findNextToken(d)){var e=utils.getParamList(d);if(d=d.replace(e,"").replace(/^\s*|\s*$/g,""),";"===utils.findNextToken(d)&&(d=d.replace(/\s*;/,"")),e=e.replace(/[\(|\)]/g,"").split(","),1===e.length){if(e=utils.resolve(b.file||process.cwd(),e[0].replace(/["|']/g,"")),-1===indexOf(b.loaded,e)){var f=b.file;b.file=e,c(fs.readFileSync(e,"utf8"),topLevelTokens,b),b.loaded.push(e),b.file=f}return d}throw new Error("import accepts a single file")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(d)+"'")},global:function(a,b){var c=a.replace(/^global\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*\s*)/);if(d){if(c=c.replace(d[0],"").replace(/^\s*|\s*$/g,""),"="===utils.findNextToken(c)){d=d[1].replace(/^\s+|\s+$/g,"");var e=utils.getTokensBetween(c,"=",";",!0).join(""),f=e.substring(1,e.length-1);if(f=f.replace(/^\s+|\s+$/g,""),/^require\(/.test(f)){var g=utils.getParamList(f.replace("require")).replace(/[\(|\)]/g,"").split(",");1===g.length&&(g=g[0].replace(/["|']/g,""),f=["require('",utils.resolve(b.file||process.cwd(),g),"')"].join(""))}return b.scope.push({name:d,body:f}),c=c.replace(e,"")}throw new Error("unexpected token : expected : '=' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},"function":function(a,b){var c=a.replace(/^function\s*/,""),d=c.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*)\s*/);if(d){if(c=c.replace(d[0],""),"("===utils.findNextToken(c)){d=d[1];var e=utils.getParamList(c);if(c=c.replace(e,"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(c)){var f=utils.getTokensBetween(c,"{","}",!0).join("");return c=c.replace(f,""),b.scope.push({name:d,body:"function"+e+f}),c}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(c)+"'")}throw new Error("unexpected token : expected : '(' found : '"+utils.findNextToken(c)+"'")}throw new Error("missing name")},rule:function(a,b,c){var d=a.replace(/^rule\s*/,""),e=d.match(/^([a-zA-Z_$][0-9a-zA-Z_$]*|"[^"]*"|'[^']*')/);if(e){if(d=d.replace(e[0],"").replace(/^\s*|\s*$/g,""),"{"===utils.findNextToken(d)){e=e[1].replace(/^["']|["']$/g,"");var f={name:e,options:{},constraints:null,action:null},g=utils.getTokensBetween(d,"{","}",!0).join("");return d=d.replace(g,""),c(g.replace(/^\{\s*|\}\s*$/g,""),ruleTokens,f),b.rules.push(f),d}throw new Error("unexpected token : expected : '{' found : '"+utils.findNextToken(d)+"'")}throw new Error("missing name")}};module.exports=topLevelTokens},{"../../extended":12,"./util.js":37,__browserify_process:54,fs:51}],37:[function(a,b,c){var d=a("__browserify_process"),e=a("path"),f=/[\s|\n|\r|\t]/,g=e.sep||("win32"===d.platform?"\\":"/"),h={"{":"}","}":"{","(":")",")":"(","[":"]"},i=c.getTokensBetween=function(a,b,c,d){var e=0,f=[];b||(b=h[c],e=1),c||(c=h[b]),a=Object(a);for(var g,i=!1,j=0,k=!1;g=a.charAt(j++);)if(g===b)e++,i?f.push(g):(i=!0,d&&f.push(g));else if(g===c&&j){if(e--,0===e){d&&f.push(g),k=!0;break}f.push(g)}else i&&f.push(g);if(!k)throw new Error("Unable to match "+b+" in "+a);return f};c.getParamList=function(a){return i(a,"(",")",!0).join("")},c.resolve=function(a,b){return""!==e.extname(a)&&(a=e.dirname(a)),1===b.split(g).length?b:e.resolve(a,b)};var j=c.findNextTokenIndex=function(a,b,c){b=b||0,c=c||a.length;var d=-1,e=a.length;for((!c||c>e)&&(c=e);c>b;b++){var g=a.charAt(b);if(!f.test(g)){d=b;break}}return d};c.findNextToken=function(a,b,c){return a.charAt(j(a,b,c))}},{__browserify_process:54,path:52}],38:[function(a,b,c){"use strict";var d=a("./extended"),e=d.isEmpty,f=d.merge,g=d.forEach,h=d.declare,i=a("./constraintMatcher"),j=a("./constraint"),k=j.EqualityConstraint,l=0,m=h({}),n=m.extend({instance:{constructor:function(a,b,c,d,h){h=h||{},this.id=l++,this.type=a,this.alias=b,this.conditions=c,this.pattern=h.pattern;var k=[new j.ObjectConstraint(a)],m=i.toConstraints(c,f({alias:b},h));if(m.length)k=k.concat(m);else{var n=new j.TrueConstraint;k.push(n)}if(d&&!e(d)){var o=new j.HashConstraint(d);k.push(o)}g(k,function(a){a.set("alias",b)}),this.constraints=k},getSpecificity:function(){for(var a=this.constraints,b=0,c=0,d=a.length;d>c;c++)a[c]instanceof k&&b++;return b},hasConstraint:function(a){return d.some(this.constraints,function(b){return b instanceof a})},hashCode:function(){return[this.type,this.alias,d.format("%j",this.conditions)].join(":")},toString:function(){return d.format("%j",this.constraints)}}}).as(c,"ObjectPattern"),o=n.extend({instance:{constructor:function(a,b,c,d,e,f){this._super([a,b,c,d,f]),this.from=e.from},hasConstraint:function(a){return d.some(this.constraints,function(b){return b instanceof a})},getSpecificity:function(){return 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l._charsWritten=d._charsWritten,h},l.prototype.toString=function(a,b,c){switch(a=String(a||"utf8").toLowerCase(),"undefined"==typeof b||0>b?b=0:b>this.length&&(b=this.length),"undefined"==typeof c||c>this.length?c=this.length:0>c&&(c=0),b+=this.offset,c+=this.offset,a){case"hex":return this.parent.hexSlice(b,c);case"utf8":case"utf-8":return this.parent.utf8Slice(b,c);case"ascii":return this.parent.asciiSlice(b,c);case"binary":return this.parent.binarySlice(b,c);case"base64":return this.parent.base64Slice(b,c);case"ucs2":case"ucs-2":return this.parent.ucs2Slice(b,c);default:throw new Error("Unknown encoding")}},l.byteLength=d.byteLength,l.prototype.fill=function(a,b,c){if(a||(a=0),b||(b=0),c||(c=this.length),"string"==typeof a&&(a=a.charCodeAt(0)),"number"!=typeof a||isNaN(a))throw new Error("value is not a number");if(b>c)throw new Error("end < start");if(c===b)return 0;if(0==this.length)return 0;if(0>b||b>=this.length)throw new Error("start out of bounds");if(0>c||c>this.length)throw new Error("end out of bounds");return this.parent.fill(a,b+this.offset,c+this.offset)},l.prototype.copy=function(a,b,c,d){var e=this;if(c||(c=0),d||(d=this.length),b||(b=0),c>d)throw new Error("sourceEnd < sourceStart");if(d===c)return 0;if(0==a.length||0==e.length)return 0;if(0>b||b>=a.length)throw new Error("targetStart out of bounds");if(0>c||c>=e.length)throw new Error("sourceStart out of bounds");if(0>d||d>e.length)throw new Error("sourceEnd out of bounds");return d>this.length&&(d=this.length),a.length-bthis.length)throw new Error("oob");if(a>b)throw new Error("oob");return new l(this.parent,b-a,+a+this.offset)},l.prototype.utf8Slice=function(a,b){return this.toString("utf8",a,b)},l.prototype.binarySlice=function(a,b){return this.toString("binary",a,b)},l.prototype.asciiSlice=function(a,b){return this.toString("ascii",a,b)},l.prototype.utf8Write=function(a,b){return this.write(a,b,"utf8")},l.prototype.binaryWrite=function(a,b){return this.write(a,b,"binary")},l.prototype.asciiWrite=function(a,b){return this.write(a,b,"ascii")},l.prototype.readUInt8=function(a,b){var c=this;return b||(D.ok(void 0!==a&&null!==a,"missing 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diff --git a/package.json b/package.json
index 07b7425..fbef763 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "nools",
     "description": "A rules engine for node",
-    "version": "0.1.14",
+    "version": "0.2.0",
     "bin": {
         "nools": "./bin/nools"
     },
diff --git a/readme.md b/readme.md
index fd1ae67..5468ae3 100644
--- a/readme.md
+++ b/readme.md
@@ -19,7 +19,10 @@ Or [download the source](https://raw.github.com/C2FO/nools/master/nools.js) ([mi
    * Flows
     * [Defining A Flow](#flow) 
     * [Sessions](#session) 
-    * [Facts](#facts) 
+    * [Facts](#facts)
+        * [Assert](#facts-assert)
+        * [Retract](#facts-retract)
+        * [Modify](#facts-modify)
     * [Firing](#firing) 
     * [Disposing](#disposing)
     * [Removing A Flow](#removing-flow)
@@ -33,16 +36,19 @@ Or [download the source](https://raw.github.com/C2FO/nools/master/nools.js) ([mi
       * [Salience](#rule-salience)
       * [Scope](#rule-scope)
       * [Constraints](#constraints)
+        * [Not](#not-constraint)
+        * [Or](#or-constraint)
+        * [From](#from-constraint)
       * [Actions](#action)
       * [Globals](#globals)
       * [Import](#import)
    * [Browser Support](#browser-support)
    * [Fibonacci](#fib)
-      
-   
 
-The [examples](https://github.com/C2FO/nools/tree/master/examples) and [tests](https://github.com/C2FO/nools/tree/master/test) are a
-great place to get started. You can ask your questions on the [Nools Google group](https://groups.google.com/forum/#!forum/nools).
+## Resources
+  * [Nools Google group](https://groups.google.com/forum/#!forum/nools)
+  * [Examples](http://c2fo.github.io/nools/examples.html)
+  * [Tests](https://github.com/C2FO/nools/tree/master/test)
 
 
 ## Defining a flow
@@ -236,8 +242,10 @@ var session = flow.getSession();
 
 Facts are items that the rules should try to match.
 
+
+### Assert
 
-To add facts to the session use **assert** method.
+To add facts to the session use `assert` method.
 
 ```javascript
 session.assert(new Message("hello"));
@@ -247,11 +255,16 @@ session.assert(new Message("goodbye"));
 
 As a convenience any object passed into **getSession** will also be asserted.
 
+**Note** assert is typically used pre engine execution and during the execution of the rules.
+
 ```javascript
 flow.getSession(new Message("hello"), new Message("hello world"), new Message("goodbye"));
 ```
 
-To retract facts from the session use the **retract** method.
+
+### Retract
+
+To remove facts from the session use the `retract` method.
 
 ```javascript
 var m = new Message("hello");
@@ -264,7 +277,13 @@ session.retract(m);
 
 ```
 
-To modify a fact use the **modify** method.
+**Note** `retract` is typically used during the execution of the rules.
+
+
+### Modify
+
+
+To modify a fact use the `modify` method.
 
 **Note** modify will not work with immutable objects (i.e. strings). 
 
@@ -280,9 +299,7 @@ session.modify(m);
 
 ```
 
-**assert** is typically used pre engine execution and during the execution of the rules.
-
-**modify** and **retract** are typically used during the execution of the rules.
+**Note** `modify` is typically used during the execution of the rules.
 
 
 
@@ -762,6 +779,43 @@ this.rule("Hello1", {salience: 10}, [Message, "m", "m.name == 'Hello'"], functio
 });
 ```
 
+Or using the DSL
+
+```javascript
+rule Hello4 {
+    salience: 7;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}
+
+rule Hello3 {
+    salience: 8;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}
+
+rule Hello2 {
+    salience: 9;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}
+
+rule Hello1 {
+    salience: 10;
+    when {
+        m: Message m.name == 'hello';
+    }
+    then {}
+}
+
+```
+
 In the above flow we define four rules each with a different salience, when a single message is asserted they will fire in order of salience (highest to lowest).
 
 ```javascript
@@ -935,6 +989,123 @@ when {
         
    4. Reference(optional) - An object where the keys are properties on the current object, and values are aliases to use. The alias may be used in succeeding patterns.
 
+
+#### Not Constraint
+
+The `not` constraint allow you to check that particular `fact` does **not** exist.
+
+```javascript
+
+[
+    [Number, "n1"],
+    ["not", Number, "n2", "n1 > n2"]
+]
+
+```
+
+Or using the DSL.
+
+```
+
+when {
+    n1: Number;
+    not(n2: Number n1 > n2);
+}
+
+```
+
+The previous example will check that for all numbers in the `workingMemory` there is **not** one that is greater than `n1`.
+
+
+#### Or Constraint
+
+The `or` constraint can be used to check for either one fact or another.
+
+```javascript
+
+[
+    ["or",
+        [String, "s", "s == 'hello'"],
+        [String, "s", "s == 'world'"]
+    ]
+]
+
+```
+
+Using the DSL.
+
+```
+when {
+    or(
+        s : String s == 'hello',
+        s : String s == 'world'
+    );
+}
+```
+
+The previous example will evaluate to `true` if you have a string in `workingMemory` that equals `hello` or `world.
+
+
+
+#### From Constraint
+
+The `from` modifier allows for the checking of facts that are not necessarily in the `workingMemory` but instead exist as a property on a fact.
+
+```javascript
+[
+    [Person, "p"],
+    [Address, "a", "a.zipcode == 88847", "from p.address"],
+    [String, "first", "first == 'bob'", "from p.firstName"],
+    [String, "last", "last == 'yukon'", "from p.lastName"]
+]
+```
+
+Or using the DSL.
+
+```
+when {
+    p: Person:
+    a: Address a.zipcode == 88847 from p.address;
+    first: String first == 'bob' from p.firstName;
+    last: String last == 'yukon' from p.lastName;
+}
+```
+
+The above example will used the address, firstName and lastName from the `person` fact.
+
+You can also use the `from` modifier to check facts that create a graph.
+
+For example assume the person object from above has friends that are also of type `Person`.
+
+```javascript
+[
+    [Person, "p"],
+    [Person, "friend", "friend.firstName != p.firstName", "from p.friends"],
+    [String, "first", "first =~ /^a/", "from friend.firstName"]
+]
+```
+
+Or using the DSL.
+
+```
+when {
+    p: Person;
+    friend: Person friend.firstName != p.firstName;
+    first: String first =~ /^a/ from friend.firstName;
+}
+```
+
+The above example will pull the `friend` fact from the friends array property on fact `p`, and first from the `friend`'s `firstName`.
+
+You could achieve the same thing using the following code if you assert all friends into working memory.
+
+```
+when {
+    p: Person;
+    friend: Person friend in p.friends && friend.firstName != p.firstName && p.firstName =~ /^a/;
+}
+```
+
 
 
 ### Action
diff --git a/test/constraintMatcher.test.js b/test/constraintMatcher.test.js
index 75899ff..5899f29 100644
--- a/test/constraintMatcher.test.js
+++ b/test/constraintMatcher.test.js
@@ -1,6 +1,8 @@
 "use strict";
 var it = require("it"),
-    assert = require("assert"), parser = require("../lib/parser"), constraintMatcher = require("../lib/constraintMatcher");
+    assert = require("assert"),
+    parser = require("../lib/parser"),
+    constraintMatcher = require("../lib/constraintMatcher");
 
 it.describe("constraint matcher", function (it) {
 
diff --git a/test/flow.test.js b/test/flow.test.js
index b0e2ecb..42d27b3 100644
--- a/test/flow.test.js
+++ b/test/flow.test.js
@@ -139,37 +139,14 @@ it.describe("Flow", function (it) {
 
     });
 
-    it.describe("errors", function (it) {
-
-        var HelloFact = declare({
-            instance: {
-                value: true
-            }
-        });
-
-        var flow = nools.flow("error flow", function (flow) {
-            flow.rule("hello rule", [HelloFact, "h"], function () {
-                throw new Error("thrown error");
-            });
-        });
-
-        it.should("handle errors", function () {
-            var session = flow.getSession();
-            session.assert(new HelloFact());
-            return session.match().then(assert.fail, function () {
-                assert.ok(true);
-            });
-        });
-
-    });
-
     it.describe("not rule", function (it) {
 
         it.describe("with a single fact", function (it) {
             var called = 0;
 
             var flow = nools.flow("notRuleSingleFact", function (flow) {
-                flow.rule("hello rule", ["not", String, "s", "s == 'hello'"], function () {
+                flow.rule("hello rule", ["not", String, "s", "s == 'hello'"], function (facts) {
+                    assert.isUndefined(facts.s);
                     called++;
                 });
             });
@@ -182,7 +159,7 @@ it.describe("Flow", function (it) {
 
             it.should(" not call when a string that does equal 'hello'", function () {
                 called = 0;
-                flow.getSession("hello").match().then(function () {
+                return flow.getSession("hello").match().then(function () {
                     assert.equal(called, 0);
                 });
             });
@@ -201,7 +178,7 @@ it.describe("Flow", function (it) {
             var flow1 = nools.flow("notRuleMultiFact", function (flow) {
                 flow.rule("order rule", [
                     [Number, "n1"],
-                    ["not", Number, "n2", "n1 > n2"]
+                    ["not", Number, "n2", "n1 != n2 && n1 > n2"]
                 ], function (facts, flow) {
                     arr.push(facts.n1);
                     flow.retract(facts.n1);
@@ -234,6 +211,114 @@ it.describe("Flow", function (it) {
             });
         });
 
+        it.describe("modifying facts", function (it) {
+            var called = 0, arr = [];
+
+            function Num(num) {
+                this.value = num;
+            }
+
+            var flow1 = nools.flow("notRuleModifyFact", function (flow) {
+                flow.rule("not rule", [
+                    [Num, "n1"],
+                    ["not", Num, "n2", "n1 != n2 && n1.value > n2.value"]
+                ], function () {
+                });
+            });
+
+            it.should("handle modifications", function () {
+                var num1 = new Num(1),
+                    num2 = new Num(2),
+                    num3 = new Num(3),
+                    num4 = new Num(4),
+                    num5 = new Num(5);
+                var session = flow1.getSession(),
+                    activationTree = session.agenda.rules["not rule"].tree;
+
+                session.assert(num1);
+                session.assert(num2);
+                session.assert(num3);
+                session.assert(num4);
+                session.assert(num5);
+                var activations = activationTree.toArray();
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num1);
+                session.modify(num1, function () {
+                    this.value = 6;
+                });
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num2);
+                session.modify(num2, function () {
+                    this.value = 7;
+                });
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num3);
+                session.modify(num3, function () {
+                    this.value = 8;
+                });
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num4);
+                session.modify(num4, function () {
+                    this.value = 9;
+                });
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num5);
+                session.modify(num5, function () {
+                    this.value = 10;
+                });
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num1);
+
+                session.retract(num1);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num2);
+
+                session.retract(num2);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num3);
+
+                session.retract(num3);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num4);
+
+                session.retract(num4);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num5);
+
+                session.retract(num5);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 0);
+
+                session.assert(num5);
+                session.assert(num4);
+                session.assert(num3);
+                session.assert(num2);
+                session.assert(num1);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num1);
+                session.retract(num1);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num2);
+                session.assert(num1);
+                activations = activationTree.toArray()
+                assert.lengthOf(activations, 1);
+                assert.equal(activations[0].match.factHash.n1, num1);
+
+            });
+        });
+
+
     });
 
     it.describe("or rule", function (it) {
@@ -362,6 +447,464 @@ it.describe("Flow", function (it) {
 
     });
 
+    it.describe("rule with from", function (it) {
+
+        it.describe("with non array properties", function (it) {
+
+            var called = 0;
+            var Address = declare({
+                instance: {
+                    constructor: function (zip) {
+                        this.zipcode = zip;
+                    }
+                }
+            });
+            var Person = declare({
+                instance: {
+                    constructor: function (first, last, address) {
+                        this.firstName = first;
+                        this.lastName = last;
+                        this.address = address;
+                    }
+                }
+            });
+
+            var flow = nools.flow("from flow", function (flow) {
+                flow.rule("from rule 1", [
+                    [Person, "p"],
+                    [Address, "a", "a.zipcode == 88847", "from p.address"],
+                    [String, "first", "first == 'bob'", "from p.firstName"],
+                    [String, "last", "last == 'yukon'", "from p.lastName"]
+                ], function (facts) {
+                    assert.equal(facts.a, facts.p.address);
+                    assert.equal(facts.a.zipcode, 88847);
+                    assert.equal(facts.first, "bob");
+                    assert.equal(facts.last, "yukon");
+                    called++;
+                });
+
+                flow.rule("from rule 2", [
+                    [Person, "p"],
+                    [Address, "a", "a.zipcode == 88845", "from p.address"],
+                    [String, "first", "first == 'bob'", "from p.firstName"],
+                    [String, "last", "last == 'yukon'", "from p.lastName"]
+                ], function (facts) {
+                    assert.equal(facts.a, facts.p.address);
+                    assert.equal(facts.a.zipcode, 88845);
+                    assert.equal(facts.first, "bob");
+                    assert.equal(facts.last, "yukon");
+                    called++;
+                });
+
+                flow.rule("from rule 3", [
+                    [Person, "p"],
+                    [Address, "a", "a.zipcode == 88847", "from p.address"],
+                    [String, "first", "first == 'sally'", "from p.firstName"],
+                    [String, "last", "last == 'yukon'", "from p.lastName"]
+                ], function (facts) {
+                    assert.equal(facts.a, facts.p.address);
+                    assert.equal(facts.a.zipcode, 88847);
+                    assert.equal(facts.first, "sally");
+                    assert.equal(facts.last, "yukon");
+                    called++;
+                });
+
+                flow.rule("from rule 4", [
+                    [Person, "p"],
+                    [Address, "a", "a.zipcode == 88845", "from p.address"],
+                    [String, "first", "first == 'sally'", "from p.firstName"],
+                    [String, "last", "last == 'yukons'", "from p.lastName"]
+                ], function (facts) {
+                    assert.equal(facts.a, facts.p.address);
+                    assert.equal(facts.a.zipcode, 88845);
+                    assert.equal(facts.first, "sally");
+                    assert.equal(facts.last, "yukons");
+                    called++;
+                });
+            });
+
+            it.should("create the proper match contexts", function () {
+                var session = flow.getSession();
+                session.assert(new Person("bob", "yukon", new Address(88847)));
+                session.assert(new Person("sally", "yukons", new Address(88847)));
+                return session.match().then(function () {
+                    assert.equal(called, 1);
+                });
+            });
+
+            it.should("propagate modified facts properly", function () {
+                var fired = [];
+                var session = flow.getSession()
+                    .on("fire", function (name, rule) {
+                        fired.push(name);
+                    });
+                var p = new Person("bob", "yukon", new Address(88847));
+                session.assert(p);
+                return session.match().then(function () {
+                    assert.deepEqual(fired, ["from rule 1"]);
+                    fired.length = 0;
+                    session.modify(p, function () {
+                        this.address = new Address(88845)
+                    });
+                    return session.match().then(function () {
+                        assert.deepEqual(fired, ["from rule 2"]);
+                        fired.length = 0;
+                        session.modify(p, function () {
+                            this.address = new Address(88847);
+                            this.firstName = "sally";
+                        });
+                        return session.match().then(function () {
+                            assert.deepEqual(fired, ["from rule 3"]);
+                            fired.length = 0;
+                            session.modify(p, function () {
+                                this.address = new Address(88845);
+                                this.lastName = "yukons"
+                            });
+                            return session.match().then(function () {
+                                assert.deepEqual(fired, ["from rule 4"]);
+                                fired.length = 0;
+                            });
+                        });
+                    });
+
+                });
+            });
+
+            it.should("retract facts properly", function () {
+                var session = flow.getSession();
+                var p = new Person("bob", "yukon", new Address(88847));
+                session.assert(p);
+                assert.equal(session.agenda.peek().name, "from rule 1");
+                session.retract(p);
+                assert.isTrue(session.agenda.isEmpty());
+            });
+        });
+
+        it.describe("with array properties", function (it) {
+
+            var called = 0;
+            var Person = declare({
+                instance: {
+                    constructor: function (first, last, friends) {
+                        this.firstName = first;
+                        this.lastName = last;
+                        this.friends = friends || [];
+                    }
+                }
+            });
+
+            var flow = nools.flow("from flow with arrays", function (flow) {
+                flow.rule("from rule 1", [
+                    [Person, "p"],
+                    [Person, "friend", "friend.firstName != p.firstName", "from p.friends"],
+                    [String, "first", "first =~ /^a/", "from friend.firstName"]
+                ], function (facts) {
+                    assert.isTrue(/^a/.test(facts.first));
+                    called++;
+                });
+
+                flow.rule("from rule 2", [
+                    [Person, "p"],
+                    [Person, "friend", "friend.firstName != p.firstName", "from p.friends"],
+                    [String, "first", "first =~ /^b/", "from friend.firstName"]
+                ], function (facts) {
+                    assert.isTrue(/^b/.test(facts.first));
+                    called++;
+                });
+            });
+
+            it.should("create all cross product matches", function () {
+                var fired = [], names = [];
+                var session = flow.getSession()
+                    .on("fire", function (name, facts) {
+                        if (facts.first.match(/^b/)) {
+                            assert.equal(name, "from rule 2");
+                        } else {
+                            assert.equal(name, "from rule 1");
+                        }
+                        names.push([facts.p.firstName, facts.first]);
+                        fired.push(name);
+                    });
+                var persons = [
+                    new Person("bob", "yukon"),
+                    new Person("andy", "yukon"),
+                    new Person("andrew", "yukon"),
+                    new Person("billy", "yukon"),
+                    new Person("sally", "yukon")
+                ];
+                //create graph
+                for (var i = 0, l = persons.length; i < l; i++) {
+                    var p = persons[i], f;
+                    for (var j = 0, l2 = persons.length; j < l2; j++) {
+                        f = persons[j];
+                        if (f !== p) {
+                            p.friends.push(f);
+                        }
+                    }
+                    session.assert(p);
+                }
+                return session.match().then(function () {
+                    assert.equal(called, 16);
+                    assert.deepEqual(fired, [
+                        'from rule 1',
+                        'from rule 1',
+                        'from rule 2',
+                        'from rule 2',
+                        'from rule 1',
+                        'from rule 1',
+                        'from rule 2',
+                        'from rule 1',
+                        'from rule 2',
+                        'from rule 2',
+                        'from rule 1',
+                        'from rule 2',
+                        'from rule 2',
+                        'from rule 1',
+                        'from rule 1',
+                        'from rule 2'
+                    ]);
+                    fired.length = 0;
+                    session.modify(persons[0], function () {
+                        this.firstName = "craig";
+                    });
+                    session.modify(persons[1], function () {
+                        this.firstName = "sally";
+                    });
+                    session.modify(persons[2], function () {
+                        this.firstName = "thede";
+                    });
+                    session.modify(persons[3], function () {
+                        this.firstName = "jake";
+                    });
+                    session.modify(persons[4], function () {
+                        this.firstName = "john";
+                    });
+                    return session.match().then(function () {
+                        assert.lengthOf(fired, 0);
+                        fired.length = 0;
+                        names.length = 0;
+                        session.modify(persons[0], function () {
+                            this.firstName = "bob";
+                        });
+                        session.modify(persons[1], function () {
+                            this.firstName = "bobby";
+                        });
+                        session.modify(persons[2], function () {
+                            this.firstName = "billy";
+                        });
+                        session.modify(persons[3], function () {
+                            this.firstName = "brian";
+                        });
+                        session.modify(persons[4], function () {
+                            this.firstName = "bryan";
+                        });
+                        return session.match().then(function () {
+                            names.sort(function (a, b) {
+                                return a[0] === b[0] ? a[1] === b[1] ? 0: a[1] > b[1] ? 1: -1: a[0] > b[0] ? 1: -1;
+                            });
+                            assert.deepEqual(names, [
+                                [ 'billy', 'bob' ],
+                                [ 'billy', 'bobby' ],
+                                [ 'billy', 'brian' ],
+                                [ 'billy', 'bryan' ],
+                                [ 'bob', 'billy' ],
+                                [ 'bob', 'bobby' ],
+                                [ 'bob', 'brian' ],
+                                [ 'bob', 'bryan' ],
+
+                                [ 'bobby', 'billy' ],
+                                [ 'bobby', 'bob' ],
+                                [ 'bobby', 'brian' ],
+                                [ 'bobby', 'bryan' ],
+
+                                [ 'brian', 'billy' ],
+                                [ 'brian', 'bob' ],
+                                [ 'brian', 'bobby' ],
+                                [ 'brian', 'bryan' ],
+
+                                [ 'bryan', 'billy' ],
+                                [ 'bryan', 'bob' ],
+                                [ 'bryan', 'bobby' ],
+                                [ 'bryan', 'brian' ]
+                            ]);
+                            assert.lengthOf(fired, 20);
+                        })
+                    })
+
+                });
+            });
+
+            it.should("retract all cross product matches", function () {
+                var session = flow.getSession();
+                var persons = [
+                    new Person("bob", "yukon"),
+                    new Person("andy", "yukon"),
+                    new Person("andrew", "yukon"),
+                    new Person("billy", "yukon"),
+                    new Person("sally", "yukon")
+                ];
+                //create graph
+                for (var i = 0, l = persons.length; i < l; i++) {
+                    var p = persons[i], f;
+                    for (var j = 0, l2 = persons.length; j < l2; j++) {
+                        f = persons[j];
+                        if (f !== p) {
+                            p.friends.push(f);
+                        }
+                    }
+                    session.assert(p);
+                }
+                assert.equal(session.agenda.getFocusedAgenda().toArray().length, 16);
+                for (i = 0, l = persons.length; i < l; i++) {
+                    session.retract(persons[i]);
+                }
+                assert.equal(session.agenda.getFocusedAgenda().toArray().length, 0);
+            });
+        });
+
+        it.describe("with not node", function (it) {
+
+            var called1 = 0, called2 = 0;
+            var Person = declare({
+                instance: {
+                    constructor: function (first, last, friends) {
+                        this.firstName = first;
+                        this.lastName = last;
+                        this.friends = friends || [];
+                    }
+                }
+            });
+
+            var flow = nools.flow("from flow with from and not", function (flow) {
+                flow.rule("from not rule 1", [
+                    [Person, "p"],
+                    ["not", Person, "friend", "p != friend && friend.lastName != p.lastName", "from p.friends"]
+                ], function (facts) {
+                    assert.isUndefined(facts.friend);
+                    called1++;
+                });
+
+                flow.rule("from not rule 2", [
+                    [Person, "p"],
+                    ["not", Person, "friend", "p != friend && friend.lastName == p.lastName", "from p.friends"]
+                ], function (facts) {
+                    assert.isUndefined(facts.friend);
+                    called2++;
+                });
+            });
+
+            it.should("only fullfill if all facts evaluate to false", function () {
+                var session = flow.getSession();
+                var persons = [
+                    new Person("bob", "yukon"),
+                    new Person("andy", "yukon"),
+                    new Person("andrew", "yukon"),
+                    new Person("billy", "yukon"),
+                    new Person("sally", "yukon")
+                ];
+                //create graph
+                for (var i = 0, l = persons.length; i < l; i++) {
+                    var p = persons[i], f;
+                    for (var j = 0, l2 = persons.length; j < l2; j++) {
+                        f = persons[j];
+//                        if (f !== p) {
+                        p.friends.push(f);
+//                        }
+                    }
+                    session.assert(p);
+                }
+                return session.match().then(function () {
+                    assert.equal(called1, 5);
+                    assert.equal(called2, 0);
+                    called1 = called2 = 0;
+                    session.modify(persons[0], function () {
+                        this.lastName = "yukon";
+                    });
+                    session.modify(persons[1], function () {
+                        this.lastName = "yuko";
+                    });
+                    session.modify(persons[2], function () {
+                        this.lastName = "yuk";
+                    });
+                    session.modify(persons[3], function () {
+                        this.lastName = "yu";
+                    });
+                    session.modify(persons[4], function () {
+                        this.lastName = "y";
+                    });
+
+                    return session.match().then(function () {
+                        assert.equal(called1, 0);
+                        assert.equal(called2, 5);
+                        called1 = called2 = 0;
+                        session.modify(persons[0], function () {
+                            this.lastName = "yukon";
+                        });
+                        session.modify(persons[1], function () {
+                            this.lastName = "yukon";
+                        });
+                        session.modify(persons[2], function () {
+                            this.lastName = "yukon";
+                        });
+                        session.modify(persons[3], function () {
+                            this.lastName = "yukon";
+                        });
+                        session.modify(persons[4], function () {
+                            this.lastName = "yukon";
+                        });
+                        session.modify(persons[0], function () {
+                            this.lastName = "yukon";
+                        });
+                        session.modify(persons[1], function () {
+                            this.lastName = "yuko";
+                        });
+                        session.modify(persons[2], function () {
+                            this.lastName = "yuk";
+                        });
+                        session.modify(persons[3], function () {
+                            this.lastName = "yu";
+                        });
+                        session.modify(persons[4], function () {
+                            this.lastName = "y";
+                        });
+                        return session.match().then(function () {
+                            assert.equal(called1, 0);
+                            assert.equal(called2, 5);
+                        });
+                    });
+                });
+            });
+
+            it.should("only fullfill if all facts evaluate to false", function () {
+                called1 = 0, called2 = 0;
+                var session = flow.getSession();
+                var persons = [
+                    new Person("bob", "yukon"),
+                    new Person("andy", "yukon"),
+                    new Person("andrew", "yukon"),
+                    new Person("billy", "yukon"),
+                    new Person("sally", "yukon"),
+                    new Person("sally", "yukons")
+                ];
+                //create graph
+                for (var i = 0, l = persons.length; i < l; i++) {
+                    var p = persons[i], f;
+                    for (var j = 0, l2 = persons.length; j < l2; j++) {
+                        f = persons[j];
+                        p.friends.push(f);
+                    }
+                    session.assert(p);
+                }
+                return session.match().then(function () {
+                    assert.equal(called1, 0);
+                    assert.equal(called2, 1);
+                });
+            });
+        });
+
+    });
+
+
     it.describe("scope option", function (it) {
 
         function isEqualTo(str, eq) {
@@ -813,7 +1356,7 @@ it.describe("Flow", function (it) {
                 this.assert(f2);
             });
 
-            flow.rule("Bootstrap", [Fibonacci, "f", "f.value == -1 && (f.sequence == 1 || f.sequence == 2)"], function (facts, flow) {
+            flow.rule("Bootstrap", [Fibonacci, "f", "f.value == -1 && (f.sequence == 1 || f.sequence == 2)"], function (facts) {
                 this.modify(facts.f, function () {
                     this.value = 1;
                 });
diff --git a/test/issues.test.js b/test/issues.test.js
index cf56c6b..0f7ec94 100644
--- a/test/issues.test.js
+++ b/test/issues.test.js
@@ -91,4 +91,67 @@ it.describe("issues", function (it) {
 
         });
     });
+
+    it.describe("81", function (it) {
+
+        it.should("allow array references when compiling rules", function () {
+
+            function ActualWeightDomain(values) {
+                this.values = values;
+            }
+
+            function ActualWeightEnteredValue(value) {
+                this.value = value;
+            }
+
+            function ActualWeightValue() {
+
+            }
+
+            var src = "rule CheckAndAssertActualWeight {" +
+                " when {" +
+                "    actualWeight_domain: ActualWeightDomain {values: _domainValues};" +
+                "    actualWeight_EnteredValue: ActualWeightEnteredValue" +
+                "    (" +
+                "        actualWeight_EnteredValue.value >= _domainValues[0] &&" +
+                "            actualWeight_EnteredValue.value <= _domainValues[1]" +
+                "    ) {value : _entered};" +
+                "}" +
+                "then {" +
+                "    assert( new ActualWeightValue({value:_entered}) );" +
+                "}" +
+                "}";
+
+            var flow = nools.compile(src, {name: "issue81", define: {
+                "ActualWeightDomain": ActualWeightDomain,
+                "ActualWeightEnteredValue": ActualWeightEnteredValue,
+                ActualWeightValue: ActualWeightValue
+            }});
+            var fired = [];
+            var session = flow.getSession(new ActualWeightEnteredValue(1), new ActualWeightDomain([1, 2])).on("fire", function (name) {
+                fired.push(name);
+            });
+            return session.match().then(function () {
+                assert.deepEqual(fired, ["CheckAndAssertActualWeight"]);
+                fired.length = 0;
+                session = flow.getSession(new ActualWeightEnteredValue(5), new ActualWeightDomain([1, 2])).on("fire", function (name) {
+                    fired.push(name);
+                });
+                return session.match().then(function () {
+                    assert.deepEqual(fired, []);
+                });
+            });
+
+        });
+
+    });
+
+    it.describe("82", function (it) {
+
+        it.should("allow a trailing comment when using the dsl", function () {
+            nools.compile("rule 'hello' {when {s: String s == 'hello';}then{console.log(s);}} //test comment ", {name: "issue82"});
+        });
+
+    });
+
 });
\ No newline at end of file
diff --git a/test/noolsParser.test.js b/test/noolsParser.test.js
index 774c66f..6d60688 100644
--- a/test/noolsParser.test.js
+++ b/test/noolsParser.test.js
@@ -505,6 +505,66 @@ it.describe("nools dsl parser", function (it) {
             assert.deepEqual(parsed, parsed2);
         });
 
+        it.should("parse when clause with from", function () {
+            var parsed = noolsParser.parse("rule TestRule { when { p : Person p.name eq 'Test'; a: Address a.zipcode == 88847 from p.address;} then {console.log($test);}}");
+            assert.deepEqual(parsed, {
+                "define": [],
+                "rules": [
+                    {
+                        "name": "TestRule",
+                        "options": {},
+                        "constraints": [
+                            [
+                                "Person",
+                                "p",
+                                "p.name eq 'Test'"
+                            ],
+                            [
+                                "Address",
+                                "a",
+                                "a.zipcode == 88847 ",
+                                "from p.address"
+                            ]
+                        ],
+                        "action": "console.log($test);"
+                    }
+                ],
+                "scope": [],
+                "loaded": [],
+                "file": undefined
+            });
+            parsed = noolsParser.parse("rule TestRule { when { p : Person p.name eq 'Test'; a: Address a.zipcode == 88847 {zipcode: zipCode} from p.address;} then {console.log($test);}}");
+            assert.deepEqual(parsed, {
+                "define": [],
+                "rules": [
+                    {
+                        "name": "TestRule",
+                        "options": {},
+                        "constraints": [
+                            [
+                                "Person",
+                                "p",
+                                "p.name eq 'Test'"
+                            ],
+                            [
+                                "Address",
+                                "a",
+                                "a.zipcode == 88847",
+                                {
+                                    "zipcode": "zipCode"
+                                },
+                                "from p.address"
+                            ]
+                        ],
+                        "action": "console.log($test);"
+                    }
+                ],
+                "scope": [],
+                "loaded": [],
+                "file": undefined
+            });
+        });
+
         it.should("parse rules with a string name in double quotes", function () {
             var parsed = noolsParser.parse('rule "' + "test rule" + '"' + " { when { c : Clazz {test : test} c.name eq 'Test';} then {console.log($test);}}");
             assert.deepEqual(parsed, {
diff --git a/test/rules.test.js b/test/rules.test.js
index ecc26f7..62feb6b 100644
--- a/test/rules.test.js
+++ b/test/rules.test.js
@@ -428,7 +428,7 @@ it.describe("Rule",function (it) {
             });
         });
 
-        it.should("should create a composite rule", function () {
+        it.should("create a composite rule", function () {
             var rule = rules.createRule("My Rule", [
                 ["string", "s"],
                 ["string", "s2", "s2 == s"]
@@ -455,7 +455,7 @@ it.describe("Rule",function (it) {
             assert.strictEqual(rule.cb, cb);
         });
 
-        it.should("should create a not pattern", function () {
+        it.should("create a not pattern", function () {
             var rule = rules.createRule("My Rule", [
                 ["string", "s"],
                 ["not", "string", "s2", "s2 == s"]
@@ -482,7 +482,7 @@ it.describe("Rule",function (it) {
             assert.strictEqual(rule.cb, cb);
         });
 
-        it.should("should create a or pattern", function () {
+        it.should("create a or pattern", function () {
             var ruleArr = rules.createRule("My Rule", [
                 ["string", "s"],
                 ["or",
@@ -513,6 +513,66 @@ it.describe("Rule",function (it) {
                 assert.strictEqual(rule.cb, cb);
             }
         });
+
+        it.should("include reference store in constraints", function () {
+            var ruleArr = rules.createRule("My Rule", [
+                ["Hash", "h", {name: "name"}],
+                ["string", "s2", "s2 == name", {length: "length"}]
+            ], cb);
+            assert.isNotNull(ruleArr);
+            assert.lengthOf(ruleArr, 1);
+
+            var rule = ruleArr[0];
+            assert.equal(rule.name, "My Rule");
+            assert.isNotNull(rule.pattern);
+            var pattern = rule.pattern;
+            assert.instanceOf(pattern, patterns.CompositePattern);
+            assert.instanceOf(pattern.leftPattern, patterns.ObjectPattern);
+            assert.instanceOf(pattern.rightPattern, patterns.ObjectPattern);
+            assert.equal(pattern.leftPattern.alias, "h");
+            assert.equal(pattern.rightPattern.alias, "s2");
+            var constrnts = pattern.leftPattern.constraints;
+            assert.lengthOf(constrnts, 3);
+            assert.instanceOf(constrnts[0], constraints.ObjectConstraint);
+            assert.instanceOf(constrnts[1], constraints.TrueConstraint);
+            assert.instanceOf(constrnts[2], constraints.HashConstraint);
+            constrnts = pattern.rightPattern.constraints;
+            assert.lengthOf(constrnts, 3);
+            assert.instanceOf(constrnts[0], constraints.ObjectConstraint);
+            assert.instanceOf(constrnts[1], constraints.ReferenceConstraint);
+            assert.instanceOf(constrnts[2], constraints.HashConstraint);
+            assert.strictEqual(rule.cb, cb);
+        });
+
+        it.should("should include from constraints", function () {
+            var ruleArr = rules.createRule("My Rule", [
+                ["Hash", "h", {name: "name"}],
+                ["string", "s2", "s2 == name", {length: "length"}, "from name"]
+            ], cb);
+            assert.isNotNull(ruleArr);
+            assert.lengthOf(ruleArr, 1);
+
+            var rule = ruleArr[0];
+            assert.equal(rule.name, "My Rule");
+            assert.isNotNull(rule.pattern);
+            var pattern = rule.pattern;
+            assert.instanceOf(pattern, patterns.CompositePattern);
+            assert.instanceOf(pattern.leftPattern, patterns.ObjectPattern);
+            assert.instanceOf(pattern.rightPattern, patterns.FromPattern);
+            assert.equal(pattern.leftPattern.alias, "h");
+            assert.equal(pattern.rightPattern.alias, "s2");
+            var constrnts = pattern.leftPattern.constraints;
+            assert.lengthOf(constrnts, 3);
+            assert.instanceOf(constrnts[0], constraints.ObjectConstraint);
+            assert.instanceOf(constrnts[1], constraints.TrueConstraint);
+            assert.instanceOf(constrnts[2], constraints.HashConstraint);
+            constrnts = pattern.rightPattern.constraints;
+            assert.lengthOf(constrnts, 3);
+            assert.instanceOf(constrnts[0], constraints.ObjectConstraint);
+            assert.instanceOf(constrnts[1], constraints.ReferenceConstraint);
+            assert.instanceOf(constrnts[2], constraints.HashConstraint);
+            assert.equal(pattern.rightPattern.from, "name");
+        });
     });
 
 }).as(module);