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   1  <?php
   2  
   3  /**
   4   * Generic pre-transform that converts an attribute with a fixed number of
   5   * values (enumerated) to CSS.
   6   */
   7  class HTMLPurifier_AttrTransform_EnumToCSS extends HTMLPurifier_AttrTransform {
   8  
   9      /**
  10       * Name of attribute to transform from
  11       */
  12      protected $attr;
  13  
  14      /**
  15       * Lookup array of attribute values to CSS
  16       */
  17      protected $enumToCSS = array();
  18  
  19      /**
  20       * Case sensitivity of the matching
  21       * @warning Currently can only be guaranteed to work with ASCII
  22       *          values.
  23       */
  24      protected $caseSensitive = false;
  25  
  26      /**
  27       * @param $attr String attribute name to transform from
  28       * @param $enumToCSS Lookup array of attribute values to CSS
  29       * @param $case_sensitive Boolean case sensitivity indicator, default false
  30       */
  31      public function __construct($attr, $enum_to_css, $case_sensitive = false) {
  32          $this->attr = $attr;
  33          $this->enumToCSS = $enum_to_css;
  34          $this->caseSensitive = (bool) $case_sensitive;
  35      }
  36  
  37      public function transform($attr, $config, $context) {
  38  
  39          if (!isset($attr[$this->attr])) return $attr;
  40  
  41          $value = trim($attr[$this->attr]);
  42          unset($attr[$this->attr]);
  43  
  44          if (!$this->caseSensitive) $value = strtolower($value);
  45  
  46          if (!isset($this->enumToCSS[$value])) {
  47              return $attr;
  48          }
  49  
  50          $this->prependCSS($attr, $this->enumToCSS[$value]);
  51  
  52          return $attr;
  53  
  54      }
  55  
  56  }
  57  
  58  // vim: et sw=4 sts=4