fix #27. "0" character not evaluated

lib/Less/Parser.php

@@ -120,8 +120,10 @@ public function getCss(){
 		//obj($root);
 
 		self::$has_extends = false;
+
 		$evaldRoot = $root->compile($this->env);
 
+
 		$joinSelector = new Less_Visitor_joinSelector();
 		$joinSelector->run($evaldRoot);
 
@@ -1247,15 +1249,15 @@ private function parseElement(){
 		$e = $this->match( array('/\\G(?:\d+\.\d+|\d+)%/', '/\\G(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/',
 			'#*', '#&', 'parseAttribute', '/\\G\([^()@]+\)/', '/\\G[\.#](?=@)/', 'parseEntitiesVariableCurly') );
 
-		if( !$e ){
+		if( !is_null($e) ){
 			if( $this->MatchChar('(') ){
 				if( ($v = $this->parseSelector()) && $this->MatchChar(')') ){
 					$e = $this->Less_Tree_Paren( $v);
 				}
 			}
 		}
 
-		if ($e) {
+		if( !is_null($e) ){
 			return $this->Less_Tree_Element( $c, $e, $this->pos, $this->env->currentFileInfo);
 		}
 	}

lib/Less/Tree/Element.php

@@ -14,7 +14,7 @@ public function __construct($combinator, $value, $index = null, $currentFileInfo
 			$combinator = new Less_Tree_Combinator($combinator);
 		}
 
-		if( $value ){
+		if( !is_null($value) ){
 			$this->value = $value;
 		}
 

test/Fixtures/less.js/less/a.less

@@ -1,30 +1,5 @@
-
-.replace.replace,
-.c.replace + .replace {
-  .replace{
-    prop: copy-paste-replace;
-  }
-}
-.rep_ace:extend(.replace.replace .replace) {}
-
-
-/*
-.a > .d,
-.z .y{
-  color: black;
-}
-.f:extend(.a) {}
-.g:extend(.d) {}
-.h:extend(.z) {}
-.i:extend(.y) {}
-.b:extend(.a > .d, .z) {}
-.c.e:extend(.b) {}
-*/
-
-/*
-.i.j:extend(.g all) {
-  color: white;
-}
-.k:extend(.i all) {}
-.l:extend(.j all) {}
-*/
+0, 1, 2, 3, 4 {
+    x-& {
+        p: v;
+    }
+}

test/index.php

@@ -122,8 +122,8 @@ public function testLessJsCssGeneration($dir, $less, $css){
 
 		$options = array();
 		$options['compress'] 		= $this->compress;
-		$options['cache_dir']		= $this->cache_dir;
-		$options['cache_method']	= 'php';
+		//$options['cache_dir']		= $this->cache_dir;
+		//$options['cache_method']	= 'php';
 
 
 
@@ -472,6 +472,10 @@ static function showError($errno, $errmsg, $filename, $linenum, $vars){
 function obj($mixed){
 	static $objects = array();
 	global $obj_buffer;
+	if( empty($obj_buffer) ){
+		$obj_buffer = "----make sure caching is turned off----\n";
+	}
+
 	static $level = 0;
 	$output = '';