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   1  <?php
   2  
   3  
   4  /**
   5   * Call
   6   *
   7   * @package Less
   8   * @subpackage tree
   9   */
  10  class Less_Tree_Call extends Less_Tree{
  11      public $value;
  12  
  13      protected $name;
  14      protected $args;
  15      protected $index;
  16      protected $currentFileInfo;
  17      public $type = 'Call';
  18  
  19  	public function __construct($name, $args, $index, $currentFileInfo = null ){
  20          $this->name = $name;
  21          $this->args = $args;
  22          $this->index = $index;
  23          $this->currentFileInfo = $currentFileInfo;
  24      }
  25  
  26      public function accept( $visitor ){
  27          $this->args = $visitor->visitArray( $this->args );
  28      }
  29  
  30      //
  31      // When evaluating a function call,
  32      // we either find the function in `tree.functions` [1],
  33      // in which case we call it, passing the  evaluated arguments,
  34      // or we simply print it out as it appeared originally [2].
  35      //
  36      // The *functions.js* file contains the built-in functions.
  37      //
  38      // The reason why we evaluate the arguments, is in the case where
  39      // we try to pass a variable to a function, like: `saturate(@color)`.
  40      // The function should receive the value, not the variable.
  41      //
  42      public function compile($env=null){
  43          $args = array();
  44          foreach($this->args as $a){
  45              $args[] = $a->compile($env);
  46          }
  47  
  48          $nameLC = strtolower($this->name);
  49          switch($nameLC){
  50              case '%':
  51              $nameLC = '_percent';
  52              break;
  53  
  54              case 'get-unit':
  55              $nameLC = 'getunit';
  56              break;
  57  
  58              case 'data-uri':
  59              $nameLC = 'datauri';
  60              break;
  61  
  62              case 'svg-gradient':
  63              $nameLC = 'svggradient';
  64              break;
  65          }
  66  
  67          $result = null;
  68          if( $nameLC === 'default' ){
  69              $result = Less_Tree_DefaultFunc::compile();
  70  
  71          }else{
  72  
  73              if( method_exists('Less_Functions',$nameLC) ){ // 1.
  74                  try {
  75  
  76                      $func = new Less_Functions($env, $this->currentFileInfo);
  77                      $result = call_user_func_array( array($func,$nameLC),$args);
  78  
  79                  } catch (Exception $e) {
  80                      throw new Less_Exception_Compiler('error evaluating function `' . $this->name . '` '.$e->getMessage().' index: '. $this->index);
  81                  }
  82              } elseif( isset( $env->functions[$nameLC] ) && is_callable( $env->functions[$nameLC] ) ) {
  83                  try {
  84                      $result = call_user_func_array( $env->functions[$nameLC], $args );
  85                  } catch (Exception $e) {
  86                      throw new Less_Exception_Compiler('error evaluating function `' . $this->name . '` '.$e->getMessage().' index: '. $this->index);
  87                  }
  88              }
  89          }
  90  
  91          if( $result !== null ){
  92              return $result;
  93          }
  94  
  95  
  96          return new Less_Tree_Call( $this->name, $args, $this->index, $this->currentFileInfo );
  97      }
  98  
  99      /**
 100       * @see Less_Tree::genCSS
 101       */
 102  	public function genCSS( $output ){
 103  
 104          $output->add( $this->name . '(', $this->currentFileInfo, $this->index );
 105          $args_len = count($this->args);
 106          for($i = 0; $i < $args_len; $i++ ){
 107              $this->args[$i]->genCSS( $output );
 108              if( $i + 1 < $args_len ){
 109                  $output->add( ', ' );
 110              }
 111          }
 112  
 113          $output->add( ')' );
 114      }
 115  
 116  
 117      //public function toCSS(){
 118      //    return $this->compile()->toCSS();
 119      //}
 120  
 121  }