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   1  <?php
   2  
   3  /**
   4   * Defines a mutation of an obsolete tag into a valid tag.
   5   */
   6  abstract class HTMLPurifier_TagTransform
   7  {
   8  
   9      /**
  10       * Tag name to transform the tag to.
  11       * @type string
  12       */
  13      public $transform_to;
  14  
  15      /**
  16       * Transforms the obsolete tag into the valid tag.
  17       * @param HTMLPurifier_Token_Tag $tag Tag to be transformed.
  18       * @param HTMLPurifier_Config $config Mandatory HTMLPurifier_Config object
  19       * @param HTMLPurifier_Context $context Mandatory HTMLPurifier_Context object
  20       */
  21      abstract public function transform($tag, $config, $context);
  22  
  23      /**
  24       * Prepends CSS properties to the style attribute, creating the
  25       * attribute if it doesn't exist.
  26       * @warning Copied over from AttrTransform, be sure to keep in sync
  27       * @param array $attr Attribute array to process (passed by reference)
  28       * @param string $css CSS to prepend
  29       */
  30      protected function prependCSS(&$attr, $css)
  31      {
  32          $attr['style'] = isset($attr['style']) ? $attr['style'] : '';
  33          $attr['style'] = $css . $attr['style'];
  34      }
  35  }
  36  
  37  // vim: et sw=4 sts=4