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   1  <?php
   2  
   3  /**
   4   * Extend Finder Visitor
   5   *
   6   * @package Less
   7   * @subpackage visitor
   8   */
   9  class Less_Visitor_extendFinder extends Less_Visitor{
  10  
  11      public $contexts = array();
  12      public $allExtendsStack;
  13      public $foundExtends;
  14  
  15  	public function __construct(){
  16          $this->contexts = array();
  17          $this->allExtendsStack = array(array());
  18          parent::__construct();
  19      }
  20  
  21      /**
  22       * @param Less_Tree_Ruleset $root
  23       */
  24      public function run($root){
  25          $root = $this->visitObj($root);
  26          $root->allExtends =& $this->allExtendsStack[0];
  27          return $root;
  28      }
  29  
  30      public function visitRule($ruleNode, &$visitDeeper ){
  31          $visitDeeper = false;
  32      }
  33  
  34      public function visitMixinDefinition( $mixinDefinitionNode, &$visitDeeper ){
  35          $visitDeeper = false;
  36      }
  37  
  38      public function visitRuleset($rulesetNode){
  39  
  40          if( $rulesetNode->root ){
  41              return;
  42          }
  43  
  44          $allSelectorsExtendList = array();
  45  
  46          // get &:extend(.a); rules which apply to all selectors in this ruleset
  47          if( $rulesetNode->rules ){
  48              foreach($rulesetNode->rules as $rule){
  49                  if( $rule instanceof Less_Tree_Extend ){
  50                      $allSelectorsExtendList[] = $rule;
  51                      $rulesetNode->extendOnEveryPath = true;
  52                  }
  53              }
  54          }
  55  
  56  
  57          // now find every selector and apply the extends that apply to all extends
  58          // and the ones which apply to an individual extend
  59          foreach($rulesetNode->paths as $selectorPath){
  60              $selector = end($selectorPath); //$selectorPath[ count($selectorPath)-1];
  61  
  62              $j = 0;
  63              foreach($selector->extendList as $extend){
  64                  $this->allExtendsStackPush($rulesetNode, $selectorPath, $extend, $j);
  65              }
  66              foreach($allSelectorsExtendList as $extend){
  67                  $this->allExtendsStackPush($rulesetNode, $selectorPath, $extend, $j);
  68              }
  69          }
  70  
  71          $this->contexts[] = $rulesetNode->selectors;
  72      }
  73  
  74      public function allExtendsStackPush($rulesetNode, $selectorPath, $extend, &$j){
  75          $this->foundExtends = true;
  76          $extend = clone $extend;
  77          $extend->findSelfSelectors( $selectorPath );
  78          $extend->ruleset = $rulesetNode;
  79          if( $j === 0 ){
  80              $extend->firstExtendOnThisSelectorPath = true;
  81          }
  82  
  83          $end_key = count($this->allExtendsStack)-1;
  84          $this->allExtendsStack[$end_key][] = $extend;
  85          $j++;
  86      }
  87  
  88  
  89      public function visitRulesetOut( $rulesetNode ){
  90          if( !is_object($rulesetNode) || !$rulesetNode->root ){
  91              array_pop($this->contexts);
  92          }
  93      }
  94  
  95      public function visitMedia( $mediaNode ){
  96          $mediaNode->allExtends = array();
  97          $this->allExtendsStack[] =& $mediaNode->allExtends;
  98      }
  99  
 100      public function visitMediaOut(){
 101          array_pop($this->allExtendsStack);
 102      }
 103  
 104      public function visitDirective( $directiveNode ){
 105          $directiveNode->allExtends = array();
 106          $this->allExtendsStack[] =& $directiveNode->allExtends;
 107      }
 108  
 109      public function visitDirectiveOut(){
 110          array_pop($this->allExtendsStack);
 111      }
 112  }
 113  
 114