1 files changed, 179 insertions, 0 deletions
diff --git a/lib/less.php/Tree/Media.php b/lib/less.php/Tree/Media.php
new file mode 100644
index 0000000..f9ee9d4
--- /dev/null
+++ b/lib/less.php/Tree/Media.php
@@ -0,0 +1,179 @@
+<?php
+
+/**
+ * Media
+ *
+ * @package Less
+ * @subpackage tree
+ */
+class Less_Tree_Media extends Less_Tree{
+
+	public $features;
+	public $rules;
+	public $index;
+	public $currentFileInfo;
+	public $isReferenced;
+	public $type = 'Media';
+
+	public function __construct($value = array(), $features = array(), $index = null, $currentFileInfo = null ){
+
+		$this->index = $index;
+		$this->currentFileInfo = $currentFileInfo;
+
+		$selectors = $this->emptySelectors();
+
+		$this->features = new Less_Tree_Value($features);
+
+		$this->rules = array(new Less_Tree_Ruleset($selectors, $value));
+		$this->rules[0]->allowImports = true;
+	}
+
+    public function accept( $visitor ){
+		$this->features = $visitor->visitObj($this->features);
+		$this->rules = $visitor->visitArray($this->rules);
+	}
+
+    /**
+     * @see Less_Tree::genCSS
+     */
+    public function genCSS( $output ){
+
+		$output->add( '@media ', $this->currentFileInfo, $this->index );
+		$this->features->genCSS( $output );
+		Less_Tree::outputRuleset( $output, $this->rules);
+
+	}
+
+	public function compile($env) {
+
+		$media = new Less_Tree_Media(array(), array(), $this->index, $this->currentFileInfo );
+
+		$strictMathBypass = false;
+		if( Less_Parser::$options['strictMath'] === false) {
+			$strictMathBypass = true;
+			Less_Parser::$options['strictMath'] = true;
+		}
+
+		$media->features = $this->features->compile($env);
+
+		if( $strictMathBypass ){
+			Less_Parser::$options['strictMath'] = false;
+		}
+
+		$env->mediaPath[] = $media;
+		$env->mediaBlocks[] = $media;
+
+		array_unshift($env->frames, $this->rules[0]);
+		$media->rules = array($this->rules[0]->compile($env));
+		array_shift($env->frames);
+
+		array_pop($env->mediaPath);
+
+		return !$env->mediaPath ? $media->compileTop($env) : $media->compileNested($env);
+	}
+
+	public function variable($name) {
+		return $this->rules[0]->variable($name);
+	}
+
+	public function find($selector) {
+		return $this->rules[0]->find($selector, $this);
+	}
+
+	public function emptySelectors(){
+		$el = new Less_Tree_Element('','&', $this->index, $this->currentFileInfo );
+		$sels = array( new Less_Tree_Selector(array($el), array(), null, $this->index, $this->currentFileInfo) );
+		$sels[0]->mediaEmpty = true;
+        return $sels;
+	}
+
+	public function markReferenced(){
+		$this->rules[0]->markReferenced();
+		$this->isReferenced = true;
+		Less_Tree::ReferencedArray($this->rules[0]->rules);
+	}
+
+	// evaltop
+	public function compileTop($env) {
+		$result = $this;
+
+		if (count($env->mediaBlocks) > 1) {
+			$selectors = $this->emptySelectors();
+			$result = new Less_Tree_Ruleset($selectors, $env->mediaBlocks);
+			$result->multiMedia = true;
+		}
+
+		$env->mediaBlocks = array();
+		$env->mediaPath = array();
+
+		return $result;
+	}
+
+	public function compileNested($env) {
+		$path = array_merge($env->mediaPath, array($this));
+
+		// Extract the media-query conditions separated with `,` (OR).
+		foreach ($path as $key => $p) {
+			$value = $p->features instanceof Less_Tree_Value ? $p->features->value : $p->features;
+			$path[$key] = is_array($value) ? $value : array($value);
+		}
+
+		// Trace all permutations to generate the resulting media-query.
+		//
+		// (a, b and c) with nested (d, e) ->
+		//	a and d
+		//	a and e
+		//	b and c and d
+		//	b and c and e
+
+		$permuted = $this->permute($path);
+		$expressions = array();
+		foreach($permuted as $path){
+
+			for( $i=0, $len=count($path); $i < $len; $i++){
+				$path[$i] = Less_Parser::is_method($path[$i], 'toCSS') ? $path[$i] : new Less_Tree_Anonymous($path[$i]);
+			}
+
+			for( $i = count($path) - 1; $i > 0; $i-- ){
+				array_splice($path, $i, 0, array(new Less_Tree_Anonymous('and')));
+			}
+
+			$expressions[] = new Less_Tree_Expression($path);
+		}
+		$this->features = new Less_Tree_Value($expressions);
+
+
+
+		// Fake a tree-node that doesn't output anything.
+		return new Less_Tree_Ruleset(array(), array());
+	}
+
+	public function permute($arr) {
+		if (!$arr)
+			return array();
+
+		if (count($arr) == 1)
+			return $arr[0];
+
+		$result = array();
+		$rest = $this->permute(array_slice($arr, 1));
+		foreach ($rest as $r) {
+			foreach ($arr[0] as $a) {
+				$result[] = array_merge(
+					is_array($a) ? $a : array($a),
+					is_array($r) ? $r : array($r)
+				);
+			}
+		}
+
+		return $result;
+	}
+
+    public function bubbleSelectors($selectors) {
+
+		if( !$selectors) return;
+
+		$this->rules = array(new Less_Tree_Ruleset( $selectors, array($this->rules[0])));
+	}
+
+}