From 7ed4579922c4658253985a0353ae5825008c374f Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Sat, 20 Jun 2015 17:35:30 +0200
Subject: [PATCH] Add checkbox-character-style rule

New rule which warns when the checkbox character is invalid
or inconsistent.

Closes GH-4.
---
 doc/rules.md                                  |  44 +++
 lib/rules/checkbox-character-style.js         | 183 +++++++++++
 lib/rules/index.js                            |   1 +
 mdast-lint.js                                 | 309 ++++++++++++++----
 mdast-lint.min.js                             |   2 +-
 package.json                                  |   2 +-
 .../checkbox-character-style-lower-x.md       |   7 +
 .../checkbox-character-style-space.md         |   7 +
 test/fixtures/checkbox-character-style-tab.md |   7 +
 .../checkbox-character-style-upper-x.md       |   7 +
 test/index.js                                 |  77 +++++
 11 files changed, 581 insertions(+), 65 deletions(-)
 create mode 100644 lib/rules/checkbox-character-style.js
 create mode 100644 test/fixtures/checkbox-character-style-lower-x.md
 create mode 100644 test/fixtures/checkbox-character-style-space.md
 create mode 100644 test/fixtures/checkbox-character-style-tab.md
 create mode 100644 test/fixtures/checkbox-character-style-upper-x.md

diff --git a/doc/rules.md b/doc/rules.md
index 34a4cdfa..7d0f62d2 100644
--- a/doc/rules.md
+++ b/doc/rules.md
@@ -11,6 +11,7 @@ fix their warnings.
     *   [externals](#externals)
     *   [reset](#reset)
     *   [blockquote-indentation](#blockquote-indentation)
+    *   [checkbox-character-style](#checkbox-character-style)
     *   [code-block-style](#code-block-style)
     *   [definition-case](#definition-case)
     *   [definition-spacing](#definition-spacing)
@@ -131,6 +132,49 @@ Options: `boolean`, default: `false`.
   The default value, `consistent`, detects the first used indentation
   and will warn when other blockquotes use a different indentation.
 
+### checkbox-character-style
+
+```md
+  <!-- Note: the double guillemet (`»`) and middle-dots represent a tab -->
+
+  <!-- Valid by default, `'consistent'`, or `{'checked': 'x'}` -->
+  - [x] List item
+  - [x] List item
+
+  <!-- Valid by default, `'consistent'`, or `{'checked': 'X'}` -->
+  - [X] List item
+  - [X] List item
+
+  <!-- Valid by default, `'consistent'`, or `{'unchecked': ' '}` -->
+  - [ ] List item
+  - [ ] List item
+
+  <!-- Valid by default, `'consistent'`, or `{'unchecked': '»'}` -->
+  - [»···] List item
+  - [»···] List item
+
+  <!-- Always invalid -->
+  - [x] List item
+  - [X] List item
+  - [ ] List item
+  - [»···] List item
+```
+
+  Warn when list item checkboxes violate a given style.
+
+  The default value, `consistent`, detects the first used checked
+  and unchecked checkbox styles, and will warn when a subsequent
+  checkboxes uses a different style.
+
+  These values can also be passed in as an object, such as:
+
+```json
+{
+   "checked": 'x',
+   "unchecked": ' '
+}
+```
+
 ### code-block-style
 
 ````md
diff --git a/lib/rules/checkbox-character-style.js b/lib/rules/checkbox-character-style.js
new file mode 100644
index 00000000..fcc1cd9b
--- /dev/null
+++ b/lib/rules/checkbox-character-style.js
@@ -0,0 +1,183 @@
+/**
+ * @author Titus Wormer
+ * @copyright 2015 Titus Wormer. All rights reserved.
+ * @module checkbox-character-style
+ * @fileoverview
+ *   Warn when list item checkboxes violate a given style.
+ *
+ *   The default value, `consistent`, detects the first used checked
+ *   and unchecked checkbox styles, and will warn when a subsequent
+ *   checkboxes uses a different style.
+ *
+ *   These values can also be passed in as an object, such as:
+ *
+ *   ```json
+ *   {
+ *      "checked": 'x',
+ *      "unchecked": ' '
+ *   }
+ *   ```
+ * @example
+ *   <!-- Note: the double guillemet (`»`) and middle-dots represent a tab -->
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'checked': 'x'}` -->
+ *   - [x] List item
+ *   - [x] List item
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'checked': 'X'}` -->
+ *   - [X] List item
+ *   - [X] List item
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'unchecked': ' '}` -->
+ *   - [ ] List item
+ *   - [ ] List item
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'unchecked': '»'}` -->
+ *   - [»···] List item
+ *   - [»···] List item
+ *
+ *   <!-- Always invalid -->
+ *   - [x] List item
+ *   - [X] List item
+ *   - [ ] List item
+ *   - [»···] List item
+ */
+
+'use strict';
+
+/*
+ * Dependencies.
+ */
+
+var visit = require('../utilities/visit');
+var position = require('../utilities/position');
+
+/*
+ * Methods.
+ */
+
+var start = position.start;
+var end = position.end;
+
+var CHECKED = {
+    'x': true,
+    'X': true
+};
+
+var UNCHECKED = {
+    ' ': true,
+    '	': true
+};
+
+/**
+ * Warn when list item checkboxes violate a given style.
+ *
+ * @param {Node} ast - Root node.
+ * @param {File} file - Virtual file.
+ * @param {Object?} preferred - An object with `checked`
+ *   and `unchecked` properties, each set to null to default to
+ *   the first found style, or set to `'x'` or `'X'` for checked,
+ *   or `' '` (space) or `'\t'` (tab) for unchecked.
+ * @param {Function} done - Callback.
+ */
+function checkboxCharacterStyle(ast, file, preferred, done) {
+    var contents = file.toString();
+
+    if (preferred === 'consistent' || typeof preferred !== 'object') {
+        preferred = {};
+    }
+
+    if (!preferred.unchecked) {
+        preferred.unchecked = null;
+    }
+
+    if (!preferred.checked) {
+        preferred.checked = null;
+    }
+
+    if (
+        preferred.unchecked !== null &&
+        UNCHECKED[preferred.unchecked] !== true
+    ) {
+        file.fail(
+            'Invalid unchecked checkbox marker `' +
+            preferred.unchecked +
+            '`: use either `\'\\t\'`, or `\' \'`'
+        );
+    }
+
+    if (
+        preferred.checked !== null &&
+        CHECKED[preferred.checked] !== true
+    ) {
+        file.fail(
+            'Invalid checked checkbox marker `' +
+            preferred.checked +
+            '`: use either `\'x\'`, or `\'X\'`'
+        );
+    }
+
+    visit(ast, 'listItem', function (node) {
+        var type;
+        var initial;
+        var final;
+        var stop;
+        var value;
+        var style;
+        var character;
+
+        /*
+         * Exit early for items without checkbox.
+         */
+
+        if (
+            node.checked !== Boolean(node.checked) ||
+            position.isGenerated(node)
+        ) {
+            return;
+        }
+
+        type = node.checked ? 'checked' : 'unchecked';
+
+        initial = start(node).offset;
+        final = (node.children.length ? start(node.children[0]) : end(node)).offset;
+
+        /*
+         * For a checkbox to be parsed, it must be followed
+         * by a white space.
+         */
+
+        value = contents.slice(initial, final).trimRight().slice(0, -1);
+
+        /*
+         * The checkbox character is behind a square
+         * bracket.
+         */
+
+        character = value.charAt(value.length - 1);
+        style = preferred[type];
+
+        if (style === null) {
+            preferred[type] = character;
+        } else if (character !== style) {
+            stop = initial + value.length;
+
+            file.warn(
+                type.charAt(0).toUpperCase() + type.slice(1) +
+                ' checkboxes should use `' + style + '` as a marker',
+                {
+                    'start': file.offsetToPosition(stop - 1),
+                    'end': file.offsetToPosition(stop)
+                }
+            );
+        }
+    });
+
+    done();
+}
+
+/*
+ * Expose.
+ */
+
+module.exports = checkboxCharacterStyle;
diff --git a/lib/rules/index.js b/lib/rules/index.js
index 73f391ae..c7ff716a 100644
--- a/lib/rules/index.js
+++ b/lib/rules/index.js
@@ -19,6 +19,7 @@ module.exports = {
     'blockquote-indentation': require('./blockquote-indentation'),
     'no-blockquote-without-caret': require('./no-blockquote-without-caret'),
     'code-block-style': require('./code-block-style'),
+    'checkbox-character-style': require('./checkbox-character-style'),
     'definition-case': require('./definition-case'),
     'definition-spacing': require('./definition-spacing'),
     'no-emphasis-as-heading': require('./no-emphasis-as-heading'),
diff --git a/mdast-lint.js b/mdast-lint.js
index 73a129d1..af2d3235 100644
--- a/mdast-lint.js
+++ b/mdast-lint.js
@@ -405,7 +405,7 @@ function lint(mdast, options) {
 
 module.exports = lint;
 
-},{"./filter":2,"./rules":18,"./sort":58,"fs":undefined,"mdast-range":64,"mdast-zone":65,"path":undefined}],4:[function(require,module,exports){
+},{"./filter":2,"./rules":19,"./sort":59,"fs":undefined,"mdast-range":65,"mdast-zone":66,"path":undefined}],4:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -515,7 +515,189 @@ function blockquoteIndentation(ast, file, preferred, done) {
 
 module.exports = blockquoteIndentation;
 
-},{"../utilities/plural":60,"../utilities/position":61,"../utilities/to-string":62,"../utilities/visit":63}],5:[function(require,module,exports){
+},{"../utilities/plural":61,"../utilities/position":62,"../utilities/to-string":63,"../utilities/visit":64}],5:[function(require,module,exports){
+/**
+ * @author Titus Wormer
+ * @copyright 2015 Titus Wormer. All rights reserved.
+ * @module checkbox-character-style
+ * @fileoverview
+ *   Warn when list item checkboxes violate a given style.
+ *
+ *   The default value, `consistent`, detects the first used checked
+ *   and unchecked checkbox styles, and will warn when a subsequent
+ *   checkboxes uses a different style.
+ *
+ *   These values can also be passed in as an object, such as:
+ *
+ *   ```json
+ *   {
+ *      "checked": 'x',
+ *      "unchecked": ' '
+ *   }
+ *   ```
+ * @example
+ *   <!-- Note: the double guillemet (`»`) and middle-dots represent a tab -->
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'checked': 'x'}` -->
+ *   - [x] List item
+ *   - [x] List item
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'checked': 'X'}` -->
+ *   - [X] List item
+ *   - [X] List item
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'unchecked': ' '}` -->
+ *   - [ ] List item
+ *   - [ ] List item
+ *
+ *   <!-- Valid by default, `'consistent'`, or `{'unchecked': '»'}` -->
+ *   - [»···] List item
+ *   - [»···] List item
+ *
+ *   <!-- Always invalid -->
+ *   - [x] List item
+ *   - [X] List item
+ *   - [ ] List item
+ *   - [»···] List item
+ */
+
+'use strict';
+
+/*
+ * Dependencies.
+ */
+
+var visit = require('../utilities/visit');
+var position = require('../utilities/position');
+
+/*
+ * Methods.
+ */
+
+var start = position.start;
+var end = position.end;
+
+var CHECKED = {
+    'x': true,
+    'X': true
+};
+
+var UNCHECKED = {
+    ' ': true,
+    '	': true
+};
+
+/**
+ * Warn when list item bullets are indented.
+ *
+ * @param {Node} ast - Root node.
+ * @param {File} file - Virtual file.
+ * @param {*} preferred - Ignored.
+ * @param {Function} done - Callback.
+ */
+function checkboxCharacterStyle(ast, file, preferred, done) {
+    var contents = file.toString();
+
+    if (preferred === 'consistent' || typeof preferred !== 'object') {
+        preferred = {};
+    }
+
+    if (!preferred.unchecked) {
+        preferred.unchecked = null;
+    }
+
+    if (!preferred.checked) {
+        preferred.checked = null;
+    }
+
+    if (
+        preferred.unchecked !== null &&
+        UNCHECKED[preferred.unchecked] !== true
+    ) {
+        file.fail(
+            'Invalid unchecked checkbox marker `' +
+            preferred.unchecked +
+            '`: use either `\'\\t\'`, or `\' \'`'
+        );
+    }
+
+    if (
+        preferred.checked !== null &&
+        CHECKED[preferred.checked] !== true
+    ) {
+        file.fail(
+            'Invalid checked checkbox marker `' +
+            preferred.checked +
+            '`: use either `\'x\'`, or `\'X\'`'
+        );
+    }
+
+    visit(ast, 'listItem', function (node) {
+        var type;
+        var initial;
+        var final;
+        var stop;
+        var value;
+        var style;
+        var character;
+
+        /*
+         * Exit early for items without checkbox.
+         */
+
+        if (
+            node.checked !== Boolean(node.checked) ||
+            position.isGenerated(node)
+        ) {
+            return;
+        }
+
+        type = node.checked ? 'checked' : 'unchecked';
+
+        initial = start(node).offset;
+        final = (node.children.length ? start(node.children[0]) : end(node)).offset;
+
+        /*
+         * For a checkbox to be parsed, it must be followed
+         * by a white space.
+         */
+
+        value = contents.slice(initial, final).trimRight().slice(0, -1);
+
+        /*
+         * The checkbox character is behind a square
+         * bracket.
+         */
+
+        character = value.charAt(value.length - 1);
+        style = preferred[type];
+
+        if (style === null) {
+            preferred[type] = character;
+        } else if (character !== style) {
+            stop = initial + value.length;
+
+            file.warn(
+                type.charAt(0).toUpperCase() + type.slice(1) +
+                ' checkboxes should use `' + style + '` as a marker',
+                {
+                    'start': file.offsetToPosition(stop - 1),
+                    'end': file.offsetToPosition(stop)
+                }
+            );
+        }
+    });
+
+    done();
+}
+
+/*
+ * Expose.
+ */
+
+module.exports = checkboxCharacterStyle;
+
+},{"../utilities/position":62,"../utilities/visit":64}],6:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -650,7 +832,7 @@ function codeBlockStyle(ast, file, preferred, done) {
 
 module.exports = codeBlockStyle;
 
-},{"../utilities/position":61,"../utilities/visit":63}],6:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],7:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -726,7 +908,7 @@ function definitionCase(ast, file, preferred, done) {
 
 module.exports = definitionCase;
 
-},{"../utilities/position":61,"../utilities/visit":63}],7:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],8:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -802,7 +984,7 @@ function definitionSpacing(ast, file, preferred, done) {
 
 module.exports = definitionSpacing;
 
-},{"../utilities/position":61,"../utilities/visit":63}],8:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],9:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -888,7 +1070,7 @@ function emphasisMarker(ast, file, preferred, done) {
 
 module.exports = emphasisMarker;
 
-},{"../utilities/position":61,"../utilities/visit":63}],9:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],10:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -995,7 +1177,7 @@ function fencedCodeFlag(ast, file, preferred, done) {
 
 module.exports = fencedCodeFlag;
 
-},{"../utilities/position":61,"../utilities/visit":63}],10:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],11:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1111,7 +1293,7 @@ function fencedCodeMarker(ast, file, preferred, done) {
 
 module.exports = fencedCodeMarker;
 
-},{"../utilities/position":61,"../utilities/visit":63}],11:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],12:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1158,7 +1340,7 @@ function fileExtension(ast, file, preferred, done) {
 
 module.exports = fileExtension;
 
-},{}],12:[function(require,module,exports){
+},{}],13:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1235,7 +1417,7 @@ function finalDefinition(ast, file, preferred, done) {
 
 module.exports = finalDefinition;
 
-},{"../utilities/position":61,"../utilities/visit":63}],13:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],14:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1275,7 +1457,7 @@ function finalNewline(ast, file, preferred, done) {
 
 module.exports = finalNewline;
 
-},{}],14:[function(require,module,exports){
+},{}],15:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1329,7 +1511,7 @@ function firstHeadingLevel(ast, file, preferred, done) {
 
 module.exports = firstHeadingLevel;
 
-},{"../utilities/position":61,"../utilities/visit":63}],15:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],16:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1391,7 +1573,7 @@ function hardBreakSpaces(ast, file, preferred, done) {
 
 module.exports = hardBreakSpaces;
 
-},{"../utilities/position":61,"../utilities/visit":63}],16:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],17:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1456,7 +1638,7 @@ function headingIncrement(ast, file, preferred, done) {
 
 module.exports = headingIncrement;
 
-},{"../utilities/position":61,"../utilities/visit":63}],17:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],18:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1556,7 +1738,7 @@ function headingStyle(ast, file, preferred, done) {
 
 module.exports = headingStyle;
 
-},{"../utilities/heading-style":59,"../utilities/position":61,"../utilities/visit":63}],18:[function(require,module,exports){
+},{"../utilities/heading-style":60,"../utilities/position":62,"../utilities/visit":64}],19:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1578,6 +1760,7 @@ module.exports = {
     'blockquote-indentation': require('./blockquote-indentation'),
     'no-blockquote-without-caret': require('./no-blockquote-without-caret'),
     'code-block-style': require('./code-block-style'),
+    'checkbox-character-style': require('./checkbox-character-style'),
     'definition-case': require('./definition-case'),
     'definition-spacing': require('./definition-spacing'),
     'no-emphasis-as-heading': require('./no-emphasis-as-heading'),
@@ -1626,7 +1809,7 @@ module.exports = {
     'unordered-list-marker-style': require('./unordered-list-marker-style')
 };
 
-},{"./blockquote-indentation":4,"./code-block-style":5,"./definition-case":6,"./definition-spacing":7,"./emphasis-marker":8,"./fenced-code-flag":9,"./fenced-code-marker":10,"./file-extension":11,"./final-definition":12,"./final-newline":13,"./first-heading-level":14,"./hard-break-spaces":15,"./heading-increment":16,"./heading-style":17,"./link-title-style":19,"./list-item-bullet-indent":20,"./list-item-content-indent":21,"./list-item-indent":22,"./list-item-spacing":23,"./maximum-heading-length":24,"./maximum-line-length":25,"./no-auto-link-without-protocol":26,"./no-blockquote-without-caret":27,"./no-consecutive-blank-lines":28,"./no-duplicate-definitions":29,"./no-duplicate-headings":30,"./no-emphasis-as-heading":31,"./no-file-name-articles":32,"./no-file-name-consecutive-dashes":33,"./no-file-name-irregular-characters":34,"./no-file-name-mixed-case":35,"./no-file-name-outer-dashes":36,"./no-heading-content-indent":37,"./no-heading-indent":38,"./no-heading-punctuation":39,"./no-html":40,"./no-inline-padding":41,"./no-literal-urls":42,"./no-missing-blank-lines":43,"./no-multiple-toplevel-headings":44,"./no-shell-dollars":45,"./no-shortcut-reference-image":46,"./no-shortcut-reference-link":47,"./no-table-indentation":48,"./no-tabs":49,"./ordered-list-marker-style":50,"./ordered-list-marker-value":51,"./rule-style":52,"./strong-marker":53,"./table-cell-padding":54,"./table-pipe-alignment":55,"./table-pipes":56,"./unordered-list-marker-style":57}],19:[function(require,module,exports){
+},{"./blockquote-indentation":4,"./checkbox-character-style":5,"./code-block-style":6,"./definition-case":7,"./definition-spacing":8,"./emphasis-marker":9,"./fenced-code-flag":10,"./fenced-code-marker":11,"./file-extension":12,"./final-definition":13,"./final-newline":14,"./first-heading-level":15,"./hard-break-spaces":16,"./heading-increment":17,"./heading-style":18,"./link-title-style":20,"./list-item-bullet-indent":21,"./list-item-content-indent":22,"./list-item-indent":23,"./list-item-spacing":24,"./maximum-heading-length":25,"./maximum-line-length":26,"./no-auto-link-without-protocol":27,"./no-blockquote-without-caret":28,"./no-consecutive-blank-lines":29,"./no-duplicate-definitions":30,"./no-duplicate-headings":31,"./no-emphasis-as-heading":32,"./no-file-name-articles":33,"./no-file-name-consecutive-dashes":34,"./no-file-name-irregular-characters":35,"./no-file-name-mixed-case":36,"./no-file-name-outer-dashes":37,"./no-heading-content-indent":38,"./no-heading-indent":39,"./no-heading-punctuation":40,"./no-html":41,"./no-inline-padding":42,"./no-literal-urls":43,"./no-missing-blank-lines":44,"./no-multiple-toplevel-headings":45,"./no-shell-dollars":46,"./no-shortcut-reference-image":47,"./no-shortcut-reference-link":48,"./no-table-indentation":49,"./no-tabs":50,"./ordered-list-marker-style":51,"./ordered-list-marker-value":52,"./rule-style":53,"./strong-marker":54,"./table-cell-padding":55,"./table-pipe-alignment":56,"./table-pipes":57,"./unordered-list-marker-style":58}],20:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1767,7 +1950,7 @@ function linkTitleStyle(ast, file, preferred, done) {
 
 module.exports = linkTitleStyle;
 
-},{"../utilities/position":61,"../utilities/visit":63}],20:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],21:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1846,7 +2029,7 @@ function listItemBulletIndent(ast, file, preferred, done) {
 
 module.exports = listItemBulletIndent;
 
-},{"../utilities/plural":60,"../utilities/position":61,"../utilities/visit":63}],21:[function(require,module,exports){
+},{"../utilities/plural":61,"../utilities/position":62,"../utilities/visit":64}],22:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -1960,7 +2143,7 @@ function listItemContentIndent(ast, file, preferred, done) {
 
 module.exports = listItemContentIndent;
 
-},{"../utilities/plural":60,"../utilities/position":61,"../utilities/visit":63}],22:[function(require,module,exports){
+},{"../utilities/plural":61,"../utilities/position":62,"../utilities/visit":64}],23:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2110,7 +2293,7 @@ function listItemIndent(ast, file, preferred, done) {
 
 module.exports = listItemIndent;
 
-},{"../utilities/plural":60,"../utilities/position":61,"../utilities/visit":63}],23:[function(require,module,exports){
+},{"../utilities/plural":61,"../utilities/position":62,"../utilities/visit":64}],24:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2230,7 +2413,7 @@ function listItemSpacing(ast, file, preferred, done) {
 
 module.exports = listItemSpacing;
 
-},{"../utilities/position":61,"../utilities/visit":63}],24:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],25:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2291,7 +2474,7 @@ function maximumHeadingLength(ast, file, preferred, done) {
 
 module.exports = maximumHeadingLength;
 
-},{"../utilities/position":61,"../utilities/to-string":62,"../utilities/visit":63}],25:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/to-string":63,"../utilities/visit":64}],26:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2477,7 +2660,7 @@ function maximumLineLength(ast, file, preferred, done) {
 
 module.exports = maximumLineLength;
 
-},{"../utilities/position":61,"../utilities/visit":63}],26:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],27:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2563,7 +2746,7 @@ function noAutoLinkWithoutProtocol(ast, file, preferred, done) {
 
 module.exports = noAutoLinkWithoutProtocol;
 
-},{"../utilities/position":61,"../utilities/to-string":62,"../utilities/visit":63}],27:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/to-string":63,"../utilities/visit":64}],28:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2649,7 +2832,7 @@ function noBlockquoteWithoutCaret(ast, file, preferred, done) {
 
 module.exports = noBlockquoteWithoutCaret;
 
-},{"../utilities/position":61,"../utilities/visit":63}],28:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],29:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2775,7 +2958,7 @@ function noConsecutiveBlankLines(ast, file, preferred, done) {
 
 module.exports = noConsecutiveBlankLines;
 
-},{"../utilities/plural":60,"../utilities/position":61,"../utilities/visit":63}],29:[function(require,module,exports){
+},{"../utilities/plural":61,"../utilities/position":62,"../utilities/visit":64}],30:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2852,7 +3035,7 @@ function noDuplicateDefinitions(ast, file, preferred, done) {
 
 module.exports = noDuplicateDefinitions;
 
-},{"../utilities/position":61,"../utilities/visit":63}],30:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],31:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -2927,7 +3110,7 @@ function noDuplicateHeadings(ast, file, preferred, done) {
 
 module.exports = noDuplicateHeadings;
 
-},{"../utilities/position":61,"../utilities/to-string":62,"../utilities/visit":63}],31:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/to-string":63,"../utilities/visit":64}],32:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3010,7 +3193,7 @@ function noEmphasisAsHeading(ast, file, preferred, done) {
 
 module.exports = noEmphasisAsHeading;
 
-},{"../utilities/position":61,"../utilities/to-string":62,"../utilities/visit":63}],32:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/to-string":63,"../utilities/visit":64}],33:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3048,7 +3231,7 @@ function noFileNameArticles(ast, file, preferred, done) {
 
 module.exports = noFileNameArticles;
 
-},{}],33:[function(require,module,exports){
+},{}],34:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3084,7 +3267,7 @@ function noFileNameConsecutiveDashes(ast, file, preferred, done) {
 
 module.exports = noFileNameConsecutiveDashes;
 
-},{}],34:[function(require,module,exports){
+},{}],35:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3124,7 +3307,7 @@ function noFileNameIrregularCharacters(ast, file, preferred, done) {
 
 module.exports = noFileNameIrregularCharacters;
 
-},{}],35:[function(require,module,exports){
+},{}],36:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3164,7 +3347,7 @@ function noFileNameMixedCase(ast, file, preferred, done) {
 
 module.exports = noFileNameMixedCase;
 
-},{}],36:[function(require,module,exports){
+},{}],37:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3200,7 +3383,7 @@ function noFileNameOuterDashes(ast, file, preferred, done) {
 
 module.exports = noFileNameOuterDashes;
 
-},{}],37:[function(require,module,exports){
+},{}],38:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3321,7 +3504,7 @@ function noHeadingContentIndent(ast, file, preferred, done) {
 
 module.exports = noHeadingContentIndent;
 
-},{"../utilities/heading-style":59,"../utilities/plural":60,"../utilities/position":61,"../utilities/visit":63}],38:[function(require,module,exports){
+},{"../utilities/heading-style":60,"../utilities/plural":61,"../utilities/position":62,"../utilities/visit":64}],39:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3424,7 +3607,7 @@ function noHeadingIndent(ast, file, preferred, done) {
 
 module.exports = noHeadingIndent;
 
-},{"../utilities/plural":60,"../utilities/position":61,"../utilities/visit":63}],39:[function(require,module,exports){
+},{"../utilities/plural":61,"../utilities/position":62,"../utilities/visit":64}],40:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3497,7 +3680,7 @@ function noHeadingPunctuation(ast, file, preferred, done) {
 
 module.exports = noHeadingPunctuation;
 
-},{"../utilities/position":61,"../utilities/to-string":62,"../utilities/visit":63}],40:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/to-string":63,"../utilities/visit":64}],41:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3544,7 +3727,7 @@ function html(ast, file, preferred, done) {
 
 module.exports = html;
 
-},{"../utilities/position":61,"../utilities/visit":63}],41:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],42:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3614,7 +3797,7 @@ function noInlinePadding(ast, file, preferred, done) {
 
 module.exports = noInlinePadding;
 
-},{"../utilities/position":61,"../utilities/to-string":62,"../utilities/visit":63}],42:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/to-string":63,"../utilities/visit":64}],43:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3678,7 +3861,7 @@ function noLiteralURLs(ast, file, preferred, done) {
 
 module.exports = noLiteralURLs;
 
-},{"../utilities/position":61,"../utilities/visit":63}],43:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],44:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3761,7 +3944,7 @@ function noMissingBlankLines(ast, file, preferred, done) {
 
 module.exports = noMissingBlankLines;
 
-},{"../utilities/position":61,"../utilities/visit":63}],44:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],45:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3823,7 +4006,7 @@ function noMultipleToplevelHeadings(ast, file, preferred, done) {
 
 module.exports = noMultipleToplevelHeadings;
 
-},{"../utilities/position":61,"../utilities/visit":63}],45:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],46:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3926,7 +4109,7 @@ function noShellDollars(ast, file, preferred, done) {
 
 module.exports = noShellDollars;
 
-},{"../utilities/position":61,"../utilities/visit":63}],46:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],47:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -3982,7 +4165,7 @@ function noShortcutReferenceImage(ast, file, preferred, done) {
 
 module.exports = noShortcutReferenceImage;
 
-},{"../utilities/position":61,"../utilities/visit":63}],47:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],48:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4038,7 +4221,7 @@ function noShortcutReferenceLink(ast, file, preferred, done) {
 
 module.exports = noShortcutReferenceLink;
 
-},{"../utilities/position":61,"../utilities/visit":63}],48:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],49:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4100,7 +4283,7 @@ function noTableIndentation(ast, file, preferred, done) {
 
 module.exports = noTableIndentation;
 
-},{"../utilities/position":61,"../utilities/visit":63}],49:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],50:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4150,7 +4333,7 @@ function noTabs(ast, file, preferred, done) {
 
 module.exports = noTabs;
 
-},{}],50:[function(require,module,exports){
+},{}],51:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4268,7 +4451,7 @@ function orderedListMarkerStyle(ast, file, preferred, done) {
 
 module.exports = orderedListMarkerStyle;
 
-},{"../utilities/position":61,"../utilities/visit":63}],51:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],52:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4426,7 +4609,7 @@ function orderedListMarkerValue(ast, file, preferred, done) {
 
 module.exports = orderedListMarkerValue;
 
-},{"../utilities/position":61,"../utilities/visit":63}],52:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],53:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4525,7 +4708,7 @@ function ruleStyle(ast, file, preferred, done) {
 
 module.exports = ruleStyle;
 
-},{"../utilities/position":61,"../utilities/visit":63}],53:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],54:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4609,7 +4792,7 @@ function strongMarker(ast, file, preferred, done) {
 
 module.exports = strongMarker;
 
-},{"../utilities/position":61,"../utilities/visit":63}],54:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],55:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4787,7 +4970,7 @@ function tableCellPadding(ast, file, preferred, done) {
 
 module.exports = tableCellPadding;
 
-},{"../utilities/position":61,"../utilities/visit":63}],55:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],56:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4889,7 +5072,7 @@ function tablePipeAlignment(ast, file, preferred, done) {
 
 module.exports = tablePipeAlignment;
 
-},{"../utilities/position":61,"../utilities/visit":63}],56:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],57:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -4966,7 +5149,7 @@ function tablePipes(ast, file, preferred, done) {
 
 module.exports = tablePipes;
 
-},{"../utilities/position":61,"../utilities/visit":63}],57:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],58:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -5089,7 +5272,7 @@ function unorderedListMarkerStyle(ast, file, preferred, done) {
 
 module.exports = unorderedListMarkerStyle;
 
-},{"../utilities/position":61,"../utilities/visit":63}],58:[function(require,module,exports){
+},{"../utilities/position":62,"../utilities/visit":64}],59:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -5135,7 +5318,7 @@ function attacher() {
 
 module.exports = attacher;
 
-},{}],59:[function(require,module,exports){
+},{}],60:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -5216,7 +5399,7 @@ function style(node, relative) {
 
 module.exports = style;
 
-},{"./position":61}],60:[function(require,module,exports){
+},{"./position":62}],61:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -5251,7 +5434,7 @@ function plural(word, count) {
 
 module.exports = plural;
 
-},{}],61:[function(require,module,exports){
+},{}],62:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -5318,7 +5501,7 @@ var position = {
 
 module.exports = position;
 
-},{}],62:[function(require,module,exports){
+},{}],63:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -5362,7 +5545,7 @@ function toString(node) {
 
 module.exports = toString;
 
-},{}],63:[function(require,module,exports){
+},{}],64:[function(require,module,exports){
 /**
  * @author Titus Wormer
  * @copyright 2015 Titus Wormer. All rights reserved.
@@ -5475,7 +5658,7 @@ function visit(tree, type, callback, reverse) {
 
 module.exports = visit;
 
-},{}],64:[function(require,module,exports){
+},{}],65:[function(require,module,exports){
 'use strict';
 
 /**
@@ -5589,7 +5772,7 @@ function offsetToPositionFactory(offsets) {
             if (offsets[index] > offset) {
                 return {
                     'line': index + 1,
-                    'column': (offset - offsets[index - 1] || 0) + 1
+                    'column': (offset - (offsets[index - 1] || 0)) + 1
                 };
             }
         }
@@ -5664,7 +5847,7 @@ function attacher() {
 
 module.exports = attacher;
 
-},{}],65:[function(require,module,exports){
+},{}],66:[function(require,module,exports){
 'use strict';
 
 /*
diff --git a/mdast-lint.min.js b/mdast-lint.min.js
index d8a3c01c..12bc28af 100644
--- a/mdast-lint.min.js
+++ b/mdast-lint.min.js
@@ -1 +1 @@
-!function(b,a){typeof exports==='object'&&typeof module!=='undefined'?module.exports=b():typeof define==='function'&&define.amd?define([],b):(typeof window!=='undefined'?a=window:typeof global!=='undefined'?a=global:typeof self!=='undefined'?a=self:a=this,a.mdastLint=b())}(function(){return function a(b,c,e){function f(d,k){if(!c[d]){if(!b[d]){var i=typeof require=='function'&&require;if(!k&&i)return i(d,!0);if(g)return g(d,!0);var j=new Error("Cannot find module '"+d+"'");throw j.code='MODULE_NOT_FOUND',j}var h=c[d]={exports:{}};b[d][0].call(h.exports,function(c){var a=b[d][1][c];return f(a?a:c)},h,h.exports,a,b,c,e)}return c[d].exports}var g=typeof require=='function'&&require;for(var d=0;d<e.length;d++)f(e[d]);return f}({1:[function(a,b,c){'use strict';b.exports=a('./lib')},{'./lib':3}],2:[function(d,a,e){'use strict';function b(b,a){if(!(a&&a.messages&&a.messages.length))return;a.messages=a.messages.filter(function(b){var d=a.lintRanges[b.ruleId],e=d&&d.length,f=-1,c;b.line||(b.line=1),b.column||(b.column=1);while(--e>f)if(c=d[e],c.position.line<b.line||c.position.line===b.line&&c.position.column<b.column)return c.state===!0;return!0})}function c(){return b}a.exports=c},{}],3:[function(a,p,q){'use strict';function o(b,c,a){function d(){function d(e,d,f){function g(c){var a=d.messages;while(d.lintIndex<a.length)a[d.lintIndex].ruleId=b,d.lintIndex++;f(c)}(d.lintIndex===undefined||d.lintIndex===null)&&(d.lintIndex=d.messages.length),c(e,d,a,g)}return a===!1?null:d}return d}function n(g){var e=d(c,g),h=d(c,'node_modules',g),f;return b(e)||b(e+'.js')?f=e:b(h)?f=h:f=g,a(f)}function m(f){var c=-1,d={},a,e,b=f?f.concat():[],g;b.push(k),g=b.length;while(++c<g){a=b[c],typeof a==='string'&&(a=n(a));for(e in a)d[e]=a[e]}return d}function l(a,n){function f(e,c){var a=c&&c.lintRanges&&c.lintRanges[e];return a?a[a.length-1].state:(d=b[e],d===!1?!1:!l||d!==null&&d!==undefined)}function k(d){var a=d.lintRanges,b;if(!a){a={};for(b in c)a[b]=[{state:f(b),position:{line:0,column:0}}];d.lintRanges=a}}function p(e,l){var a=l.file,g=e.attributes.split(' '),b=g[0],d=g[1],i,h,j;if(k(a),b!=='disable'&&b!=='enable'){a.fail('Unknown lint keyword `'+b+"`: use either `'enable'` or `'disable'`",e.node);return}if(!(d in c)){a.fail('Unknown rule: cannot '+b+" `'"+d+"'`",e.node);return}i=a.lintRanges[d],j=f(d,a),h=b==='enable',h!==j&&i.push({state:h,position:e.node.position.start})}var b=n||{},l=b.reset,c=m(b.external),e,d;a.use(i),a.use(function(){return function(b,a){k(a)}});for(e in c)a.use(o(e,c[e],b[e]));a.use(j({name:'lint',onparse:p})),a.use(h),a.use(g)}var i=a('mdast-range'),j=a('mdast-zone'),k=a('./rules'),h=a('./sort'),g=a('./filter'),f=a('path'),e=a('fs'),b=e&&e.existsSync,d=f&&f.resolve,c=process&&process.cwd();p.exports=l},{'./filter':2,'./rules':18,'./sort':58,fs:undefined,'mdast-range':64,'mdast-zone':65,path:undefined}],4:[function(b,g,i){'use strict';function c(f){var b=f.children[0],c=a.start(b).column-a.start(f).column,d=e(b).match(/^ +/);return d&&(c+=d[0].length),c}function h(e,g,b,h){b=isNaN(b)||typeof b!=='number'?null:b,d(e,'blockquote',function(e){var h,d,i;if(a.isGenerated(e))return;b?(h=c(e),d=b-h,i=d>0?'Add':'Remove',d=Math.abs(d),d!==0&&g.warn(i+' '+d+' '+f('space',d)+' between blockquote and content',a.start(e.children[0]))):b=c(e)}),h()}var d=b('../utilities/visit'),e=b('../utilities/to-string'),f=b('../utilities/plural'),a=b('../utilities/position');g.exports=h},{'../utilities/plural':60,'../utilities/position':61,'../utilities/to-string':62,'../utilities/visit':63}],5:[function(b,g,i){'use strict';function h(i,g,b,j){function k(b){var c=d(b).offset,f=e(b).offset;return a.isGenerated(b)?null:b.lang||/^\s*([~`])\1{2,}/.test(h.slice(c,f))?'fenced':'indented'}var h=g.toString();if(b=typeof b!=='string'||b==='consistent'?null:b,f[b]!==!0){g.fail('Invalid code block style `'+b+"`: use either `'consistent'`, `'fenced'`, or `'indented'`");return}c(i,'code',function(c){var a=k(c);if(!a)return;b?b!==a&&g.warn('Code blocks should be '+b,c):b=a}),j()}var c=b('../utilities/visit'),a=b('../utilities/position'),d=a.start,e=a.end,f={null:!0,fenced:!0,indented:!0};g.exports=h},{'../utilities/position':61,'../utilities/visit':63}],6:[function(c,e,g){'use strict';function f(c,e,i,h){function f(b){var f=a.start(b).offset,h=a.end(b).offset,c;if(a.isGenerated(b))return;c=g.slice(f,h).match(d)[1],c!==c.toLowerCase()&&e.warn('Do not use uppper-case characters in definition labels',b)}var g=e.toString();b(c,'definition',f),b(c,'footnoteDefinition',f),h()}var b=c('../utilities/visit'),a=c('../utilities/position'),d=/^\s*\[((?:\\[\s\S]|[^\[\]])+)\]/;e.exports=f},{'../utilities/position':61,'../utilities/visit':63}],7:[function(c,e,g){'use strict';function f(c,e,i,h){function f(b){var c=a.start(b).offset,f=a.end(b).offset,h;if(a.isGenerated(b))return;h=g.slice(c,f).match(d)[1],/[ \t\n]{2,}/.test(h)&&e.warn('Do not use consecutive white-space in definition labels',b)}var g=e.toString();b(c,'definition',f),b(c,'footnoteDefinition',f),h()}var b=c('../utilities/visit'),a=c('../utilities/position'),d=/^\s*\[((?:\\[\s\S]|[^\[\]])+)\]/;e.exports=f},{'../utilities/position':61,'../utilities/visit':63}],8:[function(b,e,g){'use strict';function f(f,e,b,g){if(b=typeof b!=='string'||b==='consistent'?null:b,d[b]!==!0){e.fail('Invalid emphasis marker `'+b+"`: use either `'consistent'`, `'*'`, or `'_'`");return}c(f,'emphasis',function(c){var d=e.toString().charAt(a.start(c).offset);if(a.isGenerated(c))return;b?d!==b&&e.warn('Emphasis should use `'+b+'` as a marker',c):b=d}),g()}var c=b('../utilities/visit'),a=b('../utilities/position'),d={'*':!0,_:!0,null:!0};e.exports=f},{'../utilities/position':61,'../utilities/visit':63}],9:[function(b,f,h){'use strict';function g(j,g,b,k){var i=g.toString(),h=!1,f=[];typeof b==='object'&&!('length'in b)&&(h=Boolean(b.allowEmpty),b=b.flags),typeof b==='object'&&'length'in b&&(f=String(b).split(',')),c(j,'code',function(b){var c=i.slice(d(b).offset,e(b).offset);if(a.isGenerated(b))return;b.lang?f.length&&f.indexOf(b.lang)===-1&&g.warn('Invalid code-language flag',b):/^\ {0,3}([~`])\1{2,}/.test(c)&&!h&&g.warn('Missing code-language flag',b)}),k()}var c=b('../utilities/visit'),a=b('../utilities/position'),d=a.start,e=a.end;f.exports=g},{'../utilities/position':61,'../utilities/visit':63}],10:[function(c,e,g){'use strict';function f(g,e,c,h){var f=e.toString();if(c=typeof c!=='string'||c==='consistent'?null:c,b[c]!==!0){e.fail('Invalid fenced code marker `'+c+"`: use either `'consistent'`, `` '`' ``, or `'~'`");return}d(g,'code',function(g){var d=f.substr(a.start(g).offset,4);if(a.isGenerated(g))return;if(d=d.trimLeft().charAt(0),b[d]!==!0)return;c?d!==c&&e.warn('Fenced code should use '+c+' as a marker',g):c=d}),h()}var d=c('../utilities/visit'),a=c('../utilities/position'),b={'`':!0,'~':!0,null:!0};e.exports=f},{'../utilities/position':61,'../utilities/visit':63}],11:[function(c,a,d){'use strict';function b(e,c,a,d){var b=c.extension;a=typeof a==='string'?a:'md',b!==''&&b!==a&&c.warn('Invalid extension: use `'+a+'`'),d()}a.exports=b},{}],12:[function(b,e,g){'use strict';function f(e,f,h,g){var b=null;c(e,function(c){var e=d(c).line;if(c.type==='root'||a.isGenerated(c))return;c.type==='definition'?b!==null&&b>e&&f.warn('Move definitions to the end of the file (after the node at line `'+b+'`)',c):b===null&&(b=e)},!0),g()}var c=b('../utilities/visit'),a=b('../utilities/position'),d=a.start;e.exports=f},{'../utilities/position':61,'../utilities/visit':63}],13:[function(c,a,d){'use strict';function b(e,c,f,d){var a=c.toString(),b=a.length-1;b>0&&a.charAt(b)!=='\n'&&c.warn('Missing newline character at end of file'),d()}a.exports=b},{}],14:[function(a,d,f){'use strict';function e(a,d,f,e){b(a,'heading',function(a){return c.isGenerated(a)?null:(a.depth!==1&&d.warn('First heading level should be `1`',a),!1)}),e()}var b=a('../utilities/visit'),c=a('../utilities/position');d.exports=e},{'../utilities/position':61,'../utilities/visit':63}],15:[function(b,d,f){'use strict';function e(e,b,g,f){var d=b.toString();c(e,'break',function(c){var e=a.start(c).offset,f=a.end(c).offset;if(a.isGenerated(c))return;d.slice(e,f).length>3&&b.warn('Use two spaces for hard line breaks',c)}),f()}var c=b('../utilities/visit'),a=b('../utilities/position');d.exports=e},{'../utilities/position':61,'../utilities/visit':63}],16:[function(a,d,f){'use strict';function e(d,e,g,f){var a=null;b(d,'heading',function(b){var d=b.depth;if(c.isGenerated(b))return;a&&d>a+1&&e.warn('Heading levels should increment by one level at a time',b),a=d}),f()}var b=a('../utilities/visit'),c=a('../utilities/position');d.exports=e},{'../utilities/position':61,'../utilities/visit':63}],17:[function(a,f,h){'use 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strict';b.exports={'no-auto-link-without-protocol':a('./no-auto-link-without-protocol'),'no-literal-urls':a('./no-literal-urls'),'no-consecutive-blank-lines':a('./no-consecutive-blank-lines'),'no-missing-blank-lines':a('./no-missing-blank-lines'),'blockquote-indentation':a('./blockquote-indentation'),'no-blockquote-without-caret':a('./no-blockquote-without-caret'),'code-block-style':a('./code-block-style'),'definition-case':a('./definition-case'),'definition-spacing':a('./definition-spacing'),'no-emphasis-as-heading':a('./no-emphasis-as-heading'),'emphasis-marker':a('./emphasis-marker'),'fenced-code-flag':a('./fenced-code-flag'),'fenced-code-marker':a('./fenced-code-marker'),'file-extension':a('./file-extension'),'final-newline':a('./final-newline'),'no-file-name-articles':a('./no-file-name-articles'),'no-file-name-consecutive-dashes':a('./no-file-name-consecutive-dashes'),'no-file-name-irregular-characters':a('./no-file-name-irregular-characters'),'no-file-name-mixed-case':a('./no-file-name-mixed-case'),'no-file-name-outer-dashes':a('./no-file-name-outer-dashes'),'final-definition':a('./final-definition'),'hard-break-spaces':a('./hard-break-spaces'),'heading-increment':a('./heading-increment'),'no-heading-content-indent':a('./no-heading-content-indent'),'no-heading-indent':a('./no-heading-indent'),'first-heading-level':a('./first-heading-level'),'maximum-heading-length':a('./maximum-heading-length'),'no-heading-punctuation':a('./no-heading-punctuation'),'heading-style':a('./heading-style'),'no-multiple-toplevel-headings':a('./no-multiple-toplevel-headings'),'no-duplicate-headings':a('./no-duplicate-headings'),'no-duplicate-definitions':a('./no-duplicate-definitions'),'no-html':a('./no-html'),'no-inline-padding':a('./no-inline-padding'),'maximum-line-length':a('./maximum-line-length'),'link-title-style':a('./link-title-style'),'list-item-bullet-indent':a('./list-item-bullet-indent'),'list-item-content-indent':a('./list-item-content-indent'),'list-item-indent':a('./list-item-indent'),'list-item-spacing':a('./list-item-spacing'),'ordered-list-marker-style':a('./ordered-list-marker-style'),'ordered-list-marker-value':a('./ordered-list-marker-value'),'no-shortcut-reference-image':a('./no-shortcut-reference-image'),'no-shortcut-reference-link':a('./no-shortcut-reference-link'),'rule-style':a('./rule-style'),'no-shell-dollars':a('./no-shell-dollars'),'strong-marker':a('./strong-marker'),'no-table-indentation':a('./no-table-indentation'),'table-pipe-alignment':a('./table-pipe-alignment'),'table-cell-padding':a('./table-cell-padding'),'table-pipes':a('./table-pipes'),'no-tabs':a('./no-tabs'),'unordered-list-marker-style':a('./unordered-list-marker-style')}},{'./blockquote-indentation':4,'./code-block-style':5,'./definition-case':6,'./definition-spacing':7,'./emphasis-marker':8,'./fenced-code-flag':9,'./fenced-code-marker':10,'./file-extension':11,'./final-definition':12,'./final-newline':13,'./first-heading-level':14,'./hard-break-spaces':15,'./heading-increment':16,'./heading-style':17,'./link-title-style':19,'./list-item-bullet-indent':20,'./list-item-content-indent':21,'./list-item-indent':22,'./list-item-spacing':23,'./maximum-heading-length':24,'./maximum-line-length':25,'./no-auto-link-without-protocol':26,'./no-blockquote-without-caret':27,'./no-consecutive-blank-lines':28,'./no-duplicate-definitions':29,'./no-duplicate-headings':30,'./no-emphasis-as-heading':31,'./no-file-name-articles':32,'./no-file-name-consecutive-dashes':33,'./no-file-name-irregular-characters':34,'./no-file-name-mixed-case':35,'./no-file-name-outer-dashes':36,'./no-heading-content-indent':37,'./no-heading-indent':38,'./no-heading-punctuation':39,'./no-html':40,'./no-inline-padding':41,'./no-literal-urls':42,'./no-missing-blank-lines':43,'./no-multiple-toplevel-headings':44,'./no-shell-dollars':45,'./no-shortcut-reference-image':46,'./no-shortcut-reference-link':47,'./no-table-indentation':48,'./no-tabs':49,'./ordered-list-marker-style':50,'./ordered-list-marker-value':51,'./rule-style':52,'./strong-marker':53,'./table-cell-padding':54,'./table-pipe-alignment':55,'./table-pipes':56,'./unordered-list-marker-style':57}],19:[function(d,f,h){'use 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i=j.children[0],g=a(j).offset,k=a(i).offset,h;if(c.isGenerated(d))return;h=f.slice(g,k).match(/^\s*/)[0].length,h!==0&&(g=a(i),b.warn('Incorrect indentation before bullet: remove '+h+' '+e('space',h),{line:g.line,column:g.column-h}))})}),h()}var d=b('../utilities/visit'),c=b('../utilities/position'),e=b('../utilities/plural'),a=c.start;f.exports=g},{'../utilities/plural':60,'../utilities/position':61,'../utilities/visit':63}],21:[function(a,f,h){'use strict';function g(g,a,i,h){var f=a.toString();d(g,'listItem',function(d){var g;d.children.forEach(function(l,n){var j=c(l),h=j.column,k,i,m;if(b.isGenerated(l))return;if(n===0){if(Boolean(d.checked)===d.checked){k=j.offset;while(f.charAt(k)!=='[')k--;h-=j.offset-k}g=h;return}h!==g&&(i=g-h,m=i>0?'add':'remove',i=Math.abs(i),a.warn('Don’t use mixed indentation for children, '+m+' '+i+' '+e('space',i),{line:c(l).line,column:h}))})}),h()}var d=a('../utilities/visit'),b=a('../utilities/position'),e=a('../utilities/plural'),c=b.start;f.exports=g},{'../utilities/plural':60,'../utilities/position':61,'../utilities/visit':63}],22:[function(b,g,i){'use strict';function h(i,g,b,j){var h=g.toString();if(b=typeof b!=='string'?'tab-size':b,f[b]!==!0){g.fail('Invalid list-item indent style `'+b+"`: use either `'tab-size'`, `'space'`, or `'mixed'`");return}d(i,'list',function(d){var f=d.children,i=d.ordered,j=d.start||1;if(c.isGenerated(d))return;f.forEach(function(r,s){var m=r.children[0],l=i?String(j+s).length+1:1,n=Math.ceil(l/4)*4,o=a(r).offset,p=a(m).offset,f,k,c,q;f=h.slice(o,p),f=f.replace(/\[[x ]?\]\s*$/i,''),b==='tab-size'?k=n:b==='space'?k=l+1:k=d.loose?n:l+1,f.length!==k&&(c=k-f.length,q=c>0?'add':'remove',c=Math.abs(c),g.warn('Incorrect list-item indent: '+q+' '+c+' '+e('space',c),a(m)))})}),j()}var d=b('../utilities/visit'),c=b('../utilities/position'),e=b('../utilities/plural'),a=c.start,f={'tab-size':!0,mixed:!0,space:!0};g.exports=h},{'../utilities/plural':60,'../utilities/position':61,'../utilities/visit':63}],23:[function(d,f,h){'use strict';function g(d,f,h,g){e(d,'list',function(g){var d=g.children,e=!0,h=b(g).column,i;if(a.isGenerated(g))return;d.forEach(function(h){var a=h.children,d=a[0],f=a[a.length-1],g=c(f).line-b(d).line>0;g&&(e=!1)}),i=e?'tight':'loose',d.forEach(function(g,k){var a=d[k+1],j=c(g).column>h;if(!a)return;j!==e&&f.warn('List item should be '+i+', isn’t',{start:c(g),end:b(a)})})}),g()}var e=d('../utilities/visit'),a=d('../utilities/position'),b=a.start,c=a.end;f.exports=g},{'../utilities/position':61,'../utilities/visit':63}],24:[function(a,e,g){'use strict';function f(e,f,a,g){a=isNaN(a)||typeof a!=='number'?60:a,b(e,'heading',function(b){if(d.isGenerated(b))return;c(b).length>a&&f.warn('Use headings shorter than `'+a+'`',b)}),g()}var b=a('../utilities/visit'),c=a('../utilities/to-string'),d=a('../utilities/position');e.exports=f},{'../utilities/position':61,'../utilities/to-string':62,'../utilities/visit':63}],25:[function(e,f,i){'use strict';function g(a){return a.type==='heading'||a.type==='table'||a.type==='code'}function h(k,l,j,q){function p(a,b){a--;while(++a<b)f[a]=''}function m(g,i,j){var b=j.children[i+1],f=c(g),h=d(g);if(a.isGenerated(g))return;if(f.column>e||h.column<e)return;if(b&&c(b).line===f.line&&(!b.value||/^(.+?[ \t].+?)/.test(b.value)))return;p(f.line-1,h.line)}var e=j&&j!==!0?j:80,n=l.toString(),f=n.split('\n'),h=-1,o=f.length,i;b(k,function(b){var e=g(b),f=e&&c(b).line,h=e&&d(b).line;if(!e||a.isGenerated(b))return;p(f-1,h)}),b(k,'link',m),b(k,'image',m);while(++h<o)i=f[h].length,i>e&&l.warn('Line must be at most '+e+' characters',{line:h+1,column:i+1});q()}var b=e('../utilities/visit'),a=e('../utilities/position'),c=a.start,d=a.end;f.exports=h},{'../utilities/position':61,'../utilities/visit':63}],26:[function(d,j,k){'use strict';function i(a){return g.test(f(a))}function h(d,f,h,g){e(d,'link',function(d){var e=c(d.children[0]).column,g=b(d.children[d.children.length-1]).column,h=c(d).column,j=b(d).column;if(a.isGenerated(d))return;h===e-1&&j===g+1&&!i(d)&&f.warn('All automatic links must start with a protocol',d)}),g()}var e=d('../utilities/visit'),f=d('../utilities/to-string'),a=d('../utilities/position'),c=a.start,b=a.end,g=/^[a-z][a-z+.-]+:\/?/i;j.exports=h},{'../utilities/position':61,'../utilities/to-string':62,'../utilities/visit':63}],27:[function(b,d,f){'use strict';function e(f,b,h,g){var d=b.toString(),e=d.length;c(f,'blockquote',function(c){var g=a.start(c).line,f=c.position&&c.position.indent;if(a.isGenerated(c)||!f||!f.length)return;f.forEach(function(h,i){var 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c=b('../utilities/visit'),a=b('../utilities/position'),d=b('../utilities/plural'),e=2;f.exports=g},{'../utilities/plural':60,'../utilities/position':61,'../utilities/visit':63}],29:[function(c,d,f){'use strict';function e(d,f,h,g){function e(b){var d=c[b.identifier],e;if(a.isGenerated(b))return;d&&d.type&&(e=a.start(d),f.warn('Do not use definitions with the same identifier ('+e.line+':'+e.column+')',b)),c[b.identifier]=b}var c={};b(d,'definition',e),b(d,'footnoteDefinition',e),g()}var a=c('../utilities/position'),b=c('../utilities/visit');d.exports=e},{'../utilities/position':61,'../utilities/visit':63}],30:[function(a,e,g){'use strict';function f(e,f,h,g){var a={};c(e,'heading',function(c){var g=d(c).toUpperCase(),e=a[g],h;if(b.isGenerated(c))return;e&&e.type==='heading'&&(h=b.start(e),f.warn('Do not use headings with similar content ('+h.line+':'+h.column+')',c)),a[g]=c}),g()}var 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d=a('../utilities/visit'),b=a('../utilities/position'),e=a('../utilities/plural'),c=b.start;f.exports=g},{'../utilities/plural':61,'../utilities/position':62,'../utilities/visit':64}],23:[function(b,g,i){'use strict';function h(i,g,b,j){var h=g.toString();if(b=typeof b!=='string'?'tab-size':b,f[b]!==!0){g.fail('Invalid list-item indent style `'+b+"`: use either `'tab-size'`, `'space'`, or `'mixed'`");return}d(i,'list',function(d){var f=d.children,i=d.ordered,j=d.start||1;if(c.isGenerated(d))return;f.forEach(function(r,s){var m=r.children[0],l=i?String(j+s).length+1:1,n=Math.ceil(l/4)*4,o=a(r).offset,p=a(m).offset,f,k,c,q;f=h.slice(o,p),f=f.replace(/\[[x ]?\]\s*$/i,''),b==='tab-size'?k=n:b==='space'?k=l+1:k=d.loose?n:l+1,f.length!==k&&(c=k-f.length,q=c>0?'add':'remove',c=Math.abs(c),g.warn('Incorrect list-item indent: '+q+' '+c+' '+e('space',c),a(m)))})}),j()}var d=b('../utilities/visit'),c=b('../utilities/position'),e=b('../utilities/plural'),a=c.start,f={'tab-size':!0,mixed:!0,space:!0};g.exports=h},{'../utilities/plural':61,'../utilities/position':62,'../utilities/visit':64}],24:[function(d,f,h){'use strict';function g(d,f,h,g){e(d,'list',function(g){var d=g.children,e=!0,h=b(g).column,i;if(a.isGenerated(g))return;d.forEach(function(h){var a=h.children,d=a[0],f=a[a.length-1],g=c(f).line-b(d).line>0;g&&(e=!1)}),i=e?'tight':'loose',d.forEach(function(g,k){var a=d[k+1],j=c(g).column>h;if(!a)return;j!==e&&f.warn('List item should be '+i+', isn’t',{start:c(g),end:b(a)})})}),g()}var e=d('../utilities/visit'),a=d('../utilities/position'),b=a.start,c=a.end;f.exports=g},{'../utilities/position':62,'../utilities/visit':64}],25:[function(a,e,g){'use strict';function f(e,f,a,g){a=isNaN(a)||typeof a!=='number'?60:a,b(e,'heading',function(b){if(d.isGenerated(b))return;c(b).length>a&&f.warn('Use headings shorter than `'+a+'`',b)}),g()}var b=a('../utilities/visit'),c=a('../utilities/to-string'),d=a('../utilities/position');e.exports=f},{'../utilities/position':62,'../utilities/to-string':63,'../utilities/visit':64}],26:[function(e,f,i){'use strict';function g(a){return a.type==='heading'||a.type==='table'||a.type==='code'}function h(k,l,j,q){function p(a,b){a--;while(++a<b)f[a]=''}function m(g,i,j){var b=j.children[i+1],f=c(g),h=d(g);if(a.isGenerated(g))return;if(f.column>e||h.column<e)return;if(b&&c(b).line===f.line&&(!b.value||/^(.+?[ \t].+?)/.test(b.value)))return;p(f.line-1,h.line)}var e=j&&j!==!0?j:80,n=l.toString(),f=n.split('\n'),h=-1,o=f.length,i;b(k,function(b){var e=g(b),f=e&&c(b).line,h=e&&d(b).line;if(!e||a.isGenerated(b))return;p(f-1,h)}),b(k,'link',m),b(k,'image',m);while(++h<o)i=f[h].length,i>e&&l.warn('Line must be at most '+e+' characters',{line:h+1,column:i+1});q()}var 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c=b('../utilities/visit'),a=b('../utilities/position');d.exports=e},{'../utilities/position':62,'../utilities/visit':64}],46:[function(a,e,g){'use strict';function f(a,e,g,f){b(a,'code',function(a){var b=a.lang,f=a.value,g;if(!b||c.isGenerated(a))return;d.indexOf(b)!==-1&&(g=f.length&&f.split('\n').every(function(a){return Boolean(!a.trim()||a.match(/^\s*\$\s*/))}),g&&e.warn('Do not use dollar signs before shell-commands',a))}),f()}var b=a('../utilities/visit'),c=a('../utilities/position'),d=['sh','bash','bats','cgi','command','fcgi','ksh','tmux','tool','zsh'];e.exports=f},{'../utilities/position':62,'../utilities/visit':64}],47:[function(a,d,f){'use strict';function e(a,d,f,e){b(a,'imageReference',function(a){if(c.isGenerated(a))return;a.referenceType==='shortcut'&&d.warn('Use the trailing [] on reference images',a)}),e()}var b=a('../utilities/visit'),c=a('../utilities/position');d.exports=e},{'../utilities/position':62,'../utilities/visit':64}],48:[function(a,d,f){'use 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c!=='string'||c==='consistent'?null:c,e[c]!==!0){f.fail('Invalid ordered list-item marker style `'+c+"`: use either `'.'` or `')'`");return}d(h,'list',function(d){var e=d.children;if(!d.ordered)return;e.forEach(function(e){var h=e.children[0],i=b(e).offset,j=b(h).offset,d;if(a.isGenerated(e))return;d=g.slice(i,j).replace(/\s|\d/g,''),d=d.replace(/\[[x ]?\]\s*$/i,''),c?d!==c&&f.warn('Marker style should be `'+c+'`',e):c=d})}),i()}var d=c('../utilities/visit'),a=c('../utilities/position'),b=a.start,e={')':!0,'.':!0,null:!0};f.exports=g},{'../utilities/position':62,'../utilities/visit':64}],52:[function(c,f,h){'use strict';function g(h,f,c,i){var g=f.toString();if(c=typeof c!=='string'?'ordered':c,e[c]!==!0){f.fail('Invalid ordered list-item marker value `'+c+"`: use either `'ordered'` or `'one'`");return}d(h,'list',function(e){var h=e.children,d=(c==='one'?1:e.start)||1;if(!e.ordered)return;h.forEach(function(h,l){var i=h.children[0],j=b(h).offset,k=b(i).offset,e;if(l===0)return;if(c==='ordered'&&d++,a.isGenerated(h))return;e=g.slice(j,k).replace(/[\s\.\)]/g,''),e=Number(e.replace(/\[[x ]?\]\s*$/i,'')),e!==d&&f.warn('Marker should be `'+d+'`, was `'+e+'`',h)})}),i()}var d=c('../utilities/visit'),a=c('../utilities/position'),b=a.start,e={ordered:!0,single:!0,one:!0};f.exports=g},{'../utilities/position':62,'../utilities/visit':64}],53:[function(b,f,i){'use strict';function g(a){return a===null||!/[^-_* ]/.test(a)}function h(i,f,b,j){var h=f.toString();if(b=typeof b!=='string'||b==='consistent'?null:b,g(b)!==!0){f.fail("Invalid preferred rule-style: provide a valid markdown rule, or `'consistent'`");return}c(i,'horizontalRule',function(c){var i=d(c).offset,j=e(c).offset,g;if(a.isGenerated(c))return;g=h.slice(i,j),b?g!==b&&f.warn('Horizontal rules should use `'+b+'`',c):b=g}),j()}var c=b('../utilities/visit'),a=b('../utilities/position'),d=a.start,e=a.end;f.exports=h},{'../utilities/position':62,'../utilities/visit':64}],54:[function(b,e,g){'use strict';function f(f,e,b,g){b=typeof b!=='string'||b==='consistent'?null:b,d[b]!==!0?e.fail('Invalid strong marker `'+b+"`: use either `'consistent'`, `'*'`, or `'_'`"):c(f,'strong',function(c){var d=e.toString().charAt(a.start(c).offset);if(a.isGenerated(c))return;b?d!==b&&e.warn('Strong should use `'+b+'` as a marker',c):b=d}),g()}var c=b('../utilities/visit'),a=b('../utilities/position'),d={'*':!0,_:!0,null:!0};e.exports=f},{'../utilities/position':62,'../utilities/visit':64}],55:[function(d,g,i){'use strict';function h(h,g,d,i){d=typeof d!=='string'||d==='consistent'?null:d,f[d]!==!0&&g.fail('Invalid table-cell-padding style `'+d+'`'),e(h,'table',function(l){function k(d,e,g,i,b){var c=o.slice(d,e),a=c.indexOf('|');g&&a!==-1&&(f[b]===undefined||a<f[b])&&(f[b]=a),i&&a!==-1&&(a=c.length-a-1,(h[b+1]===undefined||a<h[b+1])&&(h[b+1]=a))}var i=l.children,o=g.toString(),h=[],f=[],m,j,e,p,n;if(b.isGenerated(l))return;i.forEach(function(d){var b=d.children;k(a(d).offset,a(b[0]).offset,null,b[0],-1),b.forEach(function(f,g){var e=b[g+1]||null,h=a(e).offset||c(d).offset;k(c(f).offset,h,f,e,g)})}),j=h.concat(f),e=d==='padded'?1:d==='compact'?0:null,d==='padded'?e=1:d==='compact'?e=0:j.some(function(a){return e=Math.min(a,1),!0}),m=i[0].children.map(function(b){return a(b)}).concat(i[0].children.map(function(a){return c(a)})),p=e===1?'padded':'compact',n='Cell should be '+p+', isn’t',j.forEach(function(a,b){a!==e&&a!==undefined&&g.warn(n,m[b])})}),i()}var e=d('../utilities/visit'),b=d('../utilities/position'),a=b.start,c=b.end,f={null:!0,padded:!0,compact:!0};g.exports=h},{'../utilities/position':62,'../utilities/visit':64}],56:[function(d,f,h){'use strict';function g(f,d,h,g){e(f,'table',function(g){function h(c,g,b){var a=c+i.slice(c,g).indexOf('|')-j+1;e[b]===undefined?e[b]=a:a!==e[b]&&d.warn('Misaligned table fence',{start:{line:f,column:a},end:{line:f,column:a+1}})}var i=d.toString(),e=[],j,f;if(b.isGenerated(g))return;g.children.forEach(function(b){var d=b.children;f=a(b).line,j=a(b).offset,h(a(b).offset,a(d[0]).offset,0),b.children.forEach(function(g,e){var f=a(d[e+1]).offset||c(b).offset;h(c(g).offset,f,e+1)})})}),g()}var e=d('../utilities/visit'),b=d('../utilities/position'),a=b.start,c=b.end;f.exports=g},{'../utilities/position':62,'../utilities/visit':64}],57:[function(d,f,h){'use strict';function g(f,d,h,g){e(f,'table',function(f){var e=d.toString();f.children.forEach(function(f){var g=f.children,h=g[0],i=g[g.length-1],j=e.slice(b(f).offset,b(h).offset),k=e.slice(c(i).offset,c(f).offset);if(a.isGenerated(f))return;j.indexOf('|')===-1&&d.warn('Missing initial pipe in table fence',b(f)),k.indexOf('|')===-1&&d.warn('Missing final pipe in table fence',c(f))})}),g()}var e=d('../utilities/visit'),a=d('../utilities/position'),b=a.start,c=a.end;f.exports=g},{'../utilities/position':62,'../utilities/visit':64}],58:[function(c,f,h){'use strict';function g(h,f,c,i){var g=f.toString();if(c=typeof c!=='string'||c==='consistent'?null:c,e[c]!==!0){f.fail('Invalid unordered list-item marker style `'+c+"`: use either `'-'`, `'*'`, or `'+'`");return}d(h,'list',function(d){var e=d.children;if(d.ordered)return;e.forEach(function(e){var h=e.children[0],i=b(e).offset,j=b(h).offset,d;if(a.isGenerated(e))return;d=g.slice(i,j).replace(/\s/g,''),d=d.replace(/\[[x ]?\]\s*$/i,''),c?d!==c&&f.warn('Marker style should be `'+c+'`',e):c=d})}),i()}var d=c('../utilities/visit'),a=c('../utilities/position'),b=a.start,e={'-':!0,'*':!0,'+':!0,null:!0};f.exports=g},{'../utilities/position':62,'../utilities/visit':64}],59:[function(d,a,e){'use strict';function b(b,a){a.messages.sort(function(a,b){return a.line===undefined||b.line===undefined?-1:a.line===b.line?a.column-b.column:a.line-b.line})}function c(){return b}a.exports=c},{}],60:[function(c,d,f){'use strict';function b(b,a){return b<3?'atx':a==='atx'||a==='setext'?a:null}function e(c,f){var e=c.children[c.children.length-1],d=c.depth;return e?a(e).line+1===a(c).line?'setext':a(e).column+d<a(c).column?'atx-closed':b(d,f):a(c).column<d*2?b(d,f):'atx-closed'}var a=c('./position').end;d.exports=e},{'./position':62}],61:[function(c,a,d){'use strict';function b(a,b){return b===1?a:a+'s'}a.exports=b},{}],62:[function(g,e,h){'use strict';function c(a){return function(b){return b&&b.position&&b.position[a]||{}}}function f(e){var c=a(e),d=b(e);return c.line===undefined||c.column===undefined||d.line===undefined||d.column===undefined}var a=c('start'),b=c('end'),d={start:a,end:b,isGenerated:f};e.exports=d},{}],63:[function(d,b,e){'use strict';function c(a){return a&&(a.value?a.value:a.alt?a.alt:a.title)||''}function a(b){return c(b)||b.children&&b.children.map(a).join('')||''}b.exports=a},{}],64:[function(e,a,f){'use strict';function b(b,d){var a=-1,c=b.length;while(++a<c)if(d(b[a],a)===!1)return!1;return!0}function c(b,d){var a=b.length,c=-1;while(--a>c)if(d(b[a],a)===!1)return!1;return!0}function d(i,a,d,f){var g,e,h;typeof a==='function'&&(f=d,d=a,a=null),g=f?c:b,h=function(a,b){return g(a,function(a,c){return e(a,c,b)})},e=function(b,e,f){var c;return(!a||b.type===a)&&(c=d(b,e||0,f||null)),b.children&&c!==!1?h(b.children,b):c},e(i)}a.exports=d},{}],65:[function(i,c,j){'use strict';function e(b,c){function a(e){c(e);var b=e.children,d=-1,f=b?b.length:0;while(++d<f)a(b[d])}a(b)}function b(c){var d=0,a=-1,e=c.length,b=[];while(++a<e)b[a]=d+=c[a].length+1;return b}function a(a,b){a.offset=b(a)}function h(a){function b(b){var c=b&&b.line,d=b&&b.column;return isNaN(c)||isNaN(d)?-1:(a[c-2]||0)+d-1||0}return b}function f(a){function b(c){var b=-1,d=a.length;if(c<0)return{};while(++b<d)if(a[b]>c)return{line:b+1,column:c-(a[b-1]||0)+1};return{}}return b}function d(i,c){var d=String(c).split('\n'),g;if(!c||typeof c.contents!=='string')throw new Error('Missing `file` for mdast-range');d=b(d),g=h(d),c.offsetToPosition=f(d),c.positionToOffset=g,e(i,function(c){var b=c.position;b&&b.start&&a(b.start,g),b&&b.end&&a(b.end,g)})}function g(){return d}c.exports=g},{}],66:[function(n,h,m){'use strict';function f(a){return new RegExp('(\\s*<!--\\s*('+a+')'+'\\s*'+'('+'start'+'|'+'end'+')?'+'\\s*'+'('+'[\\s\\S]*?'+')'+'\\s*'+'-->'+'\\s*'+')')}function j(b,c){function a(b,e){var d=this||null;c(b,d,e),b.children&&b.children.forEach(a,b)}a(b)}function g(c){var a={};return c.replace(b,function(g,c,d,e,f){var b=d||e||f||'';return b==='true'||b===''?b=!0:b==='false'?b=!1:isNaN(b)||(b=Number(b)),a[c]=b,''}),a}function a(a,b){function e(e,i){var f=e.value,c,h;return e.type!=='html'?null:(c=f.match(d),!c||c[1].length!==f.length||c[2]!==a.name?null:(h={type:c[3]||'marker',attributes:c[4]||'',parameters:g(c[4]||''),node:e},b&&b(h,i),h))}var c=a.name,d=f(c);return e}function d(e,b){var c=b.onparse,d=a(b,function(a,b){a.type==='marker'&&c(a,b)});return function(){var a=e.apply(this,arguments);return d(a,this),a}}function e(e,b){var c=b.onstringify,d=a(b,function(a,b){a.type==='marker'&&c(a,b)});return function(a){return d(a,this),e.apply(this,arguments)}}function k(h){function l(l,m,j){var a=k(l),h=a&&a.type;d&&m===d&&(h==='start'&&e++,h==='end'&&e--,h==='end'&&e===0?(b=i(f,b,a,{start:j-b.length-1,end:j,parent:d}),b&&c.apply(d.children,[g,j+1].concat(b)),f=null,d=null,g=null,b=[]):b.push(l)),!d&&h==='start'&&(e=1,g=j,f=a,d=m)}var i=h.onrun,k=a(h),b=[],f=null,d=null,e=0,g;return function(a){j(a,l)}}function l(b,a){var c=b.Parser.prototype.blockTokenizers,f=b.Parser.prototype.inlineTokenizers,g=b.Compiler.prototype;return a.onparse&&(c.html=d(c.html,a),f.tag=d(f.tag,a)),a.onstringify&&(g.html=e(g.html,a)),a.onrun?k(a):null}function i(a){if(!(a&&a.name))throw new Error('Missing `name` in `options`');return function(b){return l(b,a)}}var c=[].splice,b=new RegExp('\\s*([-a-z09_]+)(?:=(?:"((?:\\\\[\\s\\S]|[^"])+)"|\'((?:\\\\[\\s\\S]|[^\'])+)\'|((?:\\\\[\\s\\S]|[^"\'\\s])+)))?\\s*','gi');h.exports=i},{}]},{},[1])(1)})
diff --git a/package.json b/package.json
index 6e580602..852362f5 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "lint": "npm run lint-api && npm run lint-style",
     "make": "npm run lint && npm run test-coverage",
     "build-rules": "node script/build-rule-documentation.js",
-    "build-md": "mdast . LICENSE --output",
+    "build-md": "mdast . LICENSE --output --quiet",
     "build-bundle": "browserify index.js --bare -s mdastLint > mdast-lint.js",
     "postbuild-bundle": "esmangle mdast-lint.js > mdast-lint.min.js",
     "build": "npm run build-rules && npm run build-md && npm run build-bundle",
diff --git a/test/fixtures/checkbox-character-style-lower-x.md b/test/fixtures/checkbox-character-style-lower-x.md
new file mode 100644
index 00000000..5d77f229
--- /dev/null
+++ b/test/fixtures/checkbox-character-style-lower-x.md
@@ -0,0 +1,7 @@
+*   [x] Foo;
+
+- [x]   Bar;
+
++  [x]  Baz;
+
+*   [x]  
diff --git a/test/fixtures/checkbox-character-style-space.md b/test/fixtures/checkbox-character-style-space.md
new file mode 100644
index 00000000..bd2be29f
--- /dev/null
+++ b/test/fixtures/checkbox-character-style-space.md
@@ -0,0 +1,7 @@
+*   [ ] Foo;
+
+- [ ]   Bar;
+
++  [ ]  Baz;
+
+*   [ ] 
diff --git a/test/fixtures/checkbox-character-style-tab.md b/test/fixtures/checkbox-character-style-tab.md
new file mode 100644
index 00000000..e0f2e573
--- /dev/null
+++ b/test/fixtures/checkbox-character-style-tab.md
@@ -0,0 +1,7 @@
+*   [	] Foo;
+
+- [	]   Bar;
+
++  [	]  Baz;
+
+*   [	] 
diff --git a/test/fixtures/checkbox-character-style-upper-x.md b/test/fixtures/checkbox-character-style-upper-x.md
new file mode 100644
index 00000000..dd745875
--- /dev/null
+++ b/test/fixtures/checkbox-character-style-upper-x.md
@@ -0,0 +1,7 @@
+*   [X] Foo;
+
+- [X]   Bar;
+
++  [X]  Baz;
+
+*   [X] 
diff --git a/test/index.js b/test/index.js
index e7ff25d2..c36d000d 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1725,6 +1725,83 @@ describe('Rules', function () {
             ]);
         });
     });
+
+    describeRule('checkbox-character-style', function () {
+        describeSetting(true, function () {
+            assertFile('checkbox-character-style-lower-x.md', []);
+            assertFile('checkbox-character-style-upper-x.md', []);
+            assertFile('checkbox-character-style-space.md', []);
+            assertFile('checkbox-character-style-tab.md', []);
+        });
+
+        describeSetting({
+            'checked': '@'
+        }, function () {
+            assertFile('empty.md', [
+                'empty.md:1:1: Invalid checked checkbox marker `@`: use either `\'x\'`, or `\'X\'`'
+            ]);
+        });
+
+        describeSetting({
+            'unchecked': '@'
+        }, function () {
+            assertFile('empty.md', [
+                'empty.md:1:1: Invalid unchecked checkbox marker `@`: use either `\'\\t\'`, or `\' \'`'
+            ]);
+        });
+
+        describeSetting({
+            'checked': 'X'
+        }, function () {
+            assertFile('checkbox-character-style-lower-x.md', [
+                'checkbox-character-style-lower-x.md:1:6-1:7: Checked checkboxes should use `X` as a marker',
+                'checkbox-character-style-lower-x.md:3:4-3:5: Checked checkboxes should use `X` as a marker',
+                'checkbox-character-style-lower-x.md:5:5-5:6: Checked checkboxes should use `X` as a marker',
+                'checkbox-character-style-lower-x.md:7:6-7:7: Checked checkboxes should use `X` as a marker'
+            ]);
+
+            assertFile('checkbox-character-style-upper-x.md', []);
+        });
+
+        describeSetting({
+            'checked': 'x'
+        }, function () {
+            assertFile('checkbox-character-style-lower-x.md', []);
+
+            assertFile('checkbox-character-style-upper-x.md', [
+                'checkbox-character-style-upper-x.md:1:6-1:7: Checked checkboxes should use `x` as a marker',
+                'checkbox-character-style-upper-x.md:3:4-3:5: Checked checkboxes should use `x` as a marker',
+                'checkbox-character-style-upper-x.md:5:5-5:6: Checked checkboxes should use `x` as a marker',
+                'checkbox-character-style-upper-x.md:7:6-7:7: Checked checkboxes should use `x` as a marker'
+            ]);
+        });
+
+        describeSetting({
+            'unchecked': ' '
+        }, function () {
+            assertFile('checkbox-character-style-space.md', []);
+
+            assertFile('checkbox-character-style-tab.md', [
+                'checkbox-character-style-tab.md:1:6-1:7: Unchecked checkboxes should use ` ` as a marker',
+                'checkbox-character-style-tab.md:3:4-3:5: Unchecked checkboxes should use ` ` as a marker',
+                'checkbox-character-style-tab.md:5:5-5:6: Unchecked checkboxes should use ` ` as a marker',
+                'checkbox-character-style-tab.md:7:6-7:7: Unchecked checkboxes should use ` ` as a marker'
+            ]);
+        });
+
+        describeSetting({
+            'unchecked': '\t'
+        }, function () {
+            assertFile('checkbox-character-style-space.md', [
+                'checkbox-character-style-space.md:1:6-1:7: Unchecked checkboxes should use `\t` as a marker',
+                'checkbox-character-style-space.md:3:4-3:5: Unchecked checkboxes should use `\t` as a marker',
+                'checkbox-character-style-space.md:5:5-5:6: Unchecked checkboxes should use `\t` as a marker',
+                'checkbox-character-style-space.md:7:6-7:7: Unchecked checkboxes should use `\t` as a marker'
+            ]);
+
+            assertFile('checkbox-character-style-tab.md', []);
+        });
+    });
 });
 
 /*