File indexing completed on 2024-12-22 05:36:21

 <?php
 
 /**
  * @todo Unit test
  */
 class HTMLPurifier_ContentSets
 {
 
     /**
      * List of content set strings (pipe separators) indexed by name.
      * @type array
      */
     public $info = array();
 
     /**
      * List of content set lookups (element => true) indexed by name.
      * @type array
      * @note This is in HTMLPurifier_HTMLDefinition->info_content_sets
      */
     public $lookup = array();
 
     /**
      * Synchronized list of defined content sets (keys of info).
      * @type array
      */
     protected $keys = array();
     /**
      * Synchronized list of defined content values (values of info).
      * @type array
      */
     protected $values = array();
 
     /**
      * Merges in module's content sets, expands identifiers in the content
      * sets and populates the keys, values and lookup member variables.
      * @param HTMLPurifier_HTMLModule[] $modules List of HTMLPurifier_HTMLModule
      */
     public function __construct($modules)
     {
         if (!is_array($modules)) {
             $modules = array($modules);
         }
         // populate content_sets based on module hints
         // sorry, no way of overloading
         foreach ($modules as $module) {
             foreach ($module->content_sets as $key => $value) {
                 $temp = $this->convertToLookup($value);
                 if (isset($this->lookup[$key])) {
                     // add it into the existing content set
                     $this->lookup[$key] = array_merge($this->lookup[$key], $temp);
                 } else {
                     $this->lookup[$key] = $temp;
                 }
             }
         }
         $old_lookup = false;
         while ($old_lookup !== $this->lookup) {
             $old_lookup = $this->lookup;
             foreach ($this->lookup as $i => $set) {
                 $add = array();
                 foreach ($set as $element => $x) {
                     if (isset($this->lookup[$element])) {
                         $add += $this->lookup[$element];
                         unset($this->lookup[$i][$element]);
                     }
                 }
                 $this->lookup[$i] += $add;
             }
         }
 
         foreach ($this->lookup as $key => $lookup) {
             $this->info[$key] = implode(' | ', array_keys($lookup));
         }
         $this->keys   = array_keys($this->info);
         $this->values = array_values($this->info);
     }
 
     /**
      * Accepts a definition; generates and assigns a ChildDef for it
      * @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef reference
      * @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
      */
     public function generateChildDef(&$def, $module)
     {
         if (!empty($def->child)) { // already done!
             return;
         }
         $content_model = $def->content_model;
         if (is_string($content_model)) {
             // Assume that $this->keys is alphanumeric
             $def->content_model = preg_replace_callback(
                 '/\b(' . implode('|', $this->keys) . ')\b/',
                 array($this, 'generateChildDefCallback'),
                 $content_model
             );
             //$def->content_model = str_replace(
             //    $this->keys, $this->values, $content_model);
         }
         $def->child = $this->getChildDef($def, $module);
     }
 
     public function generateChildDefCallback($matches)
     {
         return $this->info[$matches[0]];
     }
 
     /**
      * Instantiates a ChildDef based on content_model and content_model_type
      * member variables in HTMLPurifier_ElementDef
      * @note This will also defer to modules for custom HTMLPurifier_ChildDef
      *       subclasses that need content set expansion
      * @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef to have ChildDef extracted
      * @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
      * @return HTMLPurifier_ChildDef corresponding to ElementDef
      */
     public function getChildDef($def, $module)
     {
         $value = $def->content_model;
         if (is_object($value)) {
             trigger_error(
                 'Literal object child definitions should be stored in '.
                 'ElementDef->child not ElementDef->content_model',
                 E_USER_NOTICE
             );
             return $value;
         }
         switch ($def->content_model_type) {
             case 'required':
                 return new HTMLPurifier_ChildDef_Required($value);
             case 'optional':
                 return new HTMLPurifier_ChildDef_Optional($value);
             case 'empty':
                 return new HTMLPurifier_ChildDef_Empty();
             case 'custom':
                 return new HTMLPurifier_ChildDef_Custom($value);
         }
         // defer to its module
         $return = false;
         if ($module->defines_child_def) { // save a func call
             $return = $module->getChildDef($def);
         }
         if ($return !== false) {
             return $return;
         }
         // error-out
         trigger_error(
             'Could not determine which ChildDef class to instantiate',
             E_USER_ERROR
         );
         return false;
     }
 
     /**
      * Converts a string list of elements separated by pipes into
      * a lookup array.
      * @param string $string List of elements
      * @return array Lookup array of elements
      */
     protected function convertToLookup($string)
     {
         $array = explode('|', str_replace(' ', '', $string));
         $ret = array();
         foreach ($array as $k) {
             $ret[$k] = true;
         }
         return $ret;
     }
 }
 
 // vim: et sw=4 sts=4