MDL-44357 theme: Allow core to compile LESS in PHP

lib/lessphp/Visitor/extendFinder.php

@@ -0,0 +1,114 @@
+<?php
+
+/**
+ * Extend Finder Visitor
+ *
+ * @package Less
+ * @subpackage visitor
+ */
+class Less_Visitor_extendFinder extends Less_Visitor{
+
+	public $contexts = array();
+	public $allExtendsStack;
+	public $foundExtends;
+
+	function __construct(){
+		$this->contexts = array();
+		$this->allExtendsStack = array(array());
+		parent::__construct();
+	}
+
+	/**
+	 * @param Less_Tree_Ruleset $root
+	 */
+	function run($root){
+		$root = $this->visitObj($root);
+		$root->allExtends =& $this->allExtendsStack[0];
+		return $root;
+	}
+
+	function visitRule($ruleNode, &$visitDeeper ){
+		$visitDeeper = false;
+	}
+
+	function visitMixinDefinition( $mixinDefinitionNode, &$visitDeeper ){
+		$visitDeeper = false;
+	}
+
+	function visitRuleset($rulesetNode){
+
+		if( $rulesetNode->root ){
+			return;
+		}
+
+		$allSelectorsExtendList = array();
+
+		// get &:extend(.a); rules which apply to all selectors in this ruleset
+		if( $rulesetNode->rules ){
+			foreach($rulesetNode->rules as $rule){
+				if( $rule instanceof Less_Tree_Extend ){
+					$allSelectorsExtendList[] = $rule;
+					$rulesetNode->extendOnEveryPath = true;
+				}
+			}
+		}
+
+
+		// now find every selector and apply the extends that apply to all extends
+		// and the ones which apply to an individual extend
+		foreach($rulesetNode->paths as $selectorPath){
+			$selector = end($selectorPath); //$selectorPath[ count($selectorPath)-1];
+
+			$j = 0;
+			foreach($selector->extendList as $extend){
+				$this->allExtendsStackPush($rulesetNode, $selectorPath, $extend, $j);
+			}
+			foreach($allSelectorsExtendList as $extend){
+				$this->allExtendsStackPush($rulesetNode, $selectorPath, $extend, $j);
+			}
+		}
+
+		$this->contexts[] = $rulesetNode->selectors;
+	}
+
+	function allExtendsStackPush($rulesetNode, $selectorPath, $extend, &$j){
+		$this->foundExtends = true;
+		$extend = clone $extend;
+		$extend->findSelfSelectors( $selectorPath );
+		$extend->ruleset = $rulesetNode;
+		if( $j === 0 ){
+			$extend->firstExtendOnThisSelectorPath = true;
+		}
+
+		$end_key = count($this->allExtendsStack)-1;
+		$this->allExtendsStack[$end_key][] = $extend;
+		$j++;
+	}
+
+
+	function visitRulesetOut( $rulesetNode ){
+		if( !is_object($rulesetNode) || !$rulesetNode->root ){
+			array_pop($this->contexts);
+		}
+	}
+
+	function visitMedia( $mediaNode ){
+		$mediaNode->allExtends = array();
+		$this->allExtendsStack[] =& $mediaNode->allExtends;
+	}
+
+	function visitMediaOut(){
+		array_pop($this->allExtendsStack);
+	}
+
+	function visitDirective( $directiveNode ){
+		$directiveNode->allExtends = array();
+		$this->allExtendsStack[] =& $directiveNode->allExtends;
+	}
+
+	function visitDirectiveOut(){
+		array_pop($this->allExtendsStack);
+	}
+}
+
+