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   1  <?php
   2  
   3  /**
   4   * Selector
   5   *
   6   * @package Less
   7   * @subpackage tree
   8   */
   9  class Less_Tree_Selector extends Less_Tree{
  10  
  11      public $elements;
  12      public $condition;
  13      public $extendList = array();
  14      public $_css;
  15      public $index;
  16      public $evaldCondition = false;
  17      public $type = 'Selector';
  18      public $currentFileInfo = array();
  19      public $isReferenced;
  20      public $mediaEmpty;
  21  
  22      public $elements_len = 0;
  23  
  24      public $_oelements;
  25      public $_oelements_len;
  26      public $cacheable = true;
  27  
  28      /**
  29       * @param boolean $isReferenced
  30       */
  31  	public function __construct( $elements, $extendList = array() , $condition = null, $index=null, $currentFileInfo=null, $isReferenced=null ){
  32  
  33          $this->elements = $elements;
  34          $this->elements_len = count($elements);
  35          $this->extendList = $extendList;
  36          $this->condition = $condition;
  37          if( $currentFileInfo ){
  38              $this->currentFileInfo = $currentFileInfo;
  39          }
  40          $this->isReferenced = $isReferenced;
  41          if( !$condition ){
  42              $this->evaldCondition = true;
  43          }
  44  
  45          $this->CacheElements();
  46      }
  47  
  48      public function accept($visitor) {
  49          $this->elements = $visitor->visitArray($this->elements);
  50          $this->extendList = $visitor->visitArray($this->extendList);
  51          if( $this->condition ){
  52              $this->condition = $visitor->visitObj($this->condition);
  53          }
  54  
  55          if( $visitor instanceof Less_Visitor_extendFinder ){
  56              $this->CacheElements();
  57          }
  58      }
  59  
  60      public function createDerived( $elements, $extendList = null, $evaldCondition = null ){
  61          $newSelector = new Less_Tree_Selector( $elements, ($extendList ? $extendList : $this->extendList), null, $this->index, $this->currentFileInfo, $this->isReferenced);
  62          $newSelector->evaldCondition = $evaldCondition ? $evaldCondition : $this->evaldCondition;
  63          return $newSelector;
  64      }
  65  
  66  
  67  	public function match( $other ){
  68  
  69          if( !$other->_oelements || ($this->elements_len < $other->_oelements_len) ){
  70              return 0;
  71          }
  72  
  73          for( $i = 0; $i < $other->_oelements_len; $i++ ){
  74              if( $this->elements[$i]->value !== $other->_oelements[$i]) {
  75                  return 0;
  76              }
  77          }
  78  
  79          return $other->_oelements_len; // return number of matched elements
  80      }
  81  
  82  
  83  	public function CacheElements(){
  84  
  85          $this->_oelements = array();
  86          $css = '';
  87  
  88          foreach($this->elements as $v){
  89  
  90              $css .= $v->combinator;
  91              if( !$v->value_is_object ){
  92                  $css .= $v->value;
  93                  continue;
  94              }
  95  
  96              if( !property_exists($v->value,'value') || !is_string($v->value->value) ){
  97                  $this->cacheable = false;
  98                  return;
  99              }
 100              $css .= $v->value->value;
 101          }
 102  
 103          $this->_oelements_len = preg_match_all('/[,&#\.\w-](?:[\w-]|(?:\\\\.))*/', $css, $matches);
 104          if( $this->_oelements_len ){
 105              $this->_oelements = $matches[0];
 106  
 107              if( $this->_oelements[0] === '&' ){
 108                  array_shift($this->_oelements);
 109                  $this->_oelements_len--;
 110              }
 111          }
 112      }
 113  
 114  	public function isJustParentSelector(){
 115          return !$this->mediaEmpty &&
 116              count($this->elements) === 1 &&
 117              $this->elements[0]->value === '&' &&
 118              ($this->elements[0]->combinator === ' ' || $this->elements[0]->combinator === '');
 119      }
 120  
 121  	public function compile($env) {
 122  
 123          $elements = array();
 124          foreach($this->elements as $el){
 125              $elements[] = $el->compile($env);
 126          }
 127  
 128          $extendList = array();
 129          foreach($this->extendList as $el){
 130              $extendList[] = $el->compile($el);
 131          }
 132  
 133          $evaldCondition = false;
 134          if( $this->condition ){
 135              $evaldCondition = $this->condition->compile($env);
 136          }
 137  
 138          return $this->createDerived( $elements, $extendList, $evaldCondition );
 139      }
 140  
 141  
 142      /**
 143       * @see Less_Tree::genCSS
 144       */
 145      public function genCSS( $output, $firstSelector = true ){
 146  
 147          if( !$firstSelector && $this->elements[0]->combinator === "" ){
 148              $output->add(' ', $this->currentFileInfo, $this->index);
 149          }
 150  
 151          foreach($this->elements as $element){
 152              $element->genCSS( $output );
 153          }
 154      }
 155  
 156      public function markReferenced(){
 157          $this->isReferenced = true;
 158      }
 159  
 160      public function getIsReferenced(){
 161          return !isset($this->currentFileInfo['reference']) || !$this->currentFileInfo['reference'] || $this->isReferenced;
 162      }
 163  
 164      public function getIsOutput(){
 165          return $this->evaldCondition;
 166      }
 167  
 168  }