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 <?php
 
 /**
  * Defines common attribute collections that modules reference
  */
 
 class HTMLPurifier_AttrCollections
 {
 
     /**
      * Associative array of attribute collections, indexed by name.
      * @type array
      */
     public $info = array();
 
     /**
      * Performs all expansions on internal data for use by other inclusions
      * It also collects all attribute collection extensions from
      * modules
      * @param HTMLPurifier_AttrTypes $attr_types HTMLPurifier_AttrTypes instance
      * @param HTMLPurifier_HTMLModule[] $modules Hash array of HTMLPurifier_HTMLModule members
      */
     public function __construct($attr_types, $modules)
     {
         $this->doConstruct($attr_types, $modules);
     }
 
     public function doConstruct($attr_types, $modules)
     {
         // load extensions from the modules
         foreach ($modules as $module) {
             foreach ($module->attr_collections as $coll_i => $coll) {
                 if (!isset($this->info[$coll_i])) {
                     $this->info[$coll_i] = array();
                 }
                 foreach ($coll as $attr_i => $attr) {
                     if ($attr_i === 0 && isset($this->info[$coll_i][$attr_i])) {
                         // merge in includes
                         $this->info[$coll_i][$attr_i] = array_merge(
                             $this->info[$coll_i][$attr_i],
                             $attr
                         );
                         continue;
                     }
                     $this->info[$coll_i][$attr_i] = $attr;
                 }
             }
         }
         // perform internal expansions and inclusions
         foreach ($this->info as $name => $attr) {
             // merge attribute collections that include others
             $this->performInclusions($this->info[$name]);
             // replace string identifiers with actual attribute objects
             $this->expandIdentifiers($this->info[$name], $attr_types);
         }
     }
 
     /**
      * Takes a reference to an attribute associative array and performs
      * all inclusions specified by the zero index.
      * @param array &$attr Reference to attribute array
      */
     public function performInclusions(&$attr)
     {
         if (!isset($attr[0])) {
             return;
         }
         $merge = $attr[0];
         $seen  = array(); // recursion guard
         // loop through all the inclusions
         for ($i = 0; isset($merge[$i]); $i++) {
             if (isset($seen[$merge[$i]])) {
                 continue;
             }
             $seen[$merge[$i]] = true;
             // foreach attribute of the inclusion, copy it over
             if (!isset($this->info[$merge[$i]])) {
                 continue;
             }
             foreach ($this->info[$merge[$i]] as $key => $value) {
                 if (isset($attr[$key])) {
                     continue;
                 } // also catches more inclusions
                 $attr[$key] = $value;
             }
             if (isset($this->info[$merge[$i]][0])) {
                 // recursion
                 $merge = array_merge($merge, $this->info[$merge[$i]][0]);
             }
         }
         unset($attr[0]);
     }
 
     /**
      * Expands all string identifiers in an attribute array by replacing
      * them with the appropriate values inside HTMLPurifier_AttrTypes
      * @param array &$attr Reference to attribute array
      * @param HTMLPurifier_AttrTypes $attr_types HTMLPurifier_AttrTypes instance
      */
     public function expandIdentifiers(&$attr, $attr_types)
     {
         // because foreach will process new elements we add, make sure we
         // skip duplicates
         $processed = array();
 
         foreach ($attr as $def_i => $def) {
             // skip inclusions
             if ($def_i === 0) {
                 continue;
             }
 
             if (isset($processed[$def_i])) {
                 continue;
             }
 
             // determine whether or not attribute is required
             if ($required = (strpos($def_i, '*') !== false)) {
                 // rename the definition
                 unset($attr[$def_i]);
                 $def_i = trim($def_i, '*');
                 $attr[$def_i] = $def;
             }
 
             $processed[$def_i] = true;
 
             // if we've already got a literal object, move on
             if (is_object($def)) {
                 // preserve previous required
                 $attr[$def_i]->required = ($required || $attr[$def_i]->required);
                 continue;
             }
 
             if ($def === false) {
                 unset($attr[$def_i]);
                 continue;
             }
 
             if ($t = $attr_types->get($def)) {
                 $attr[$def_i] = $t;
                 $attr[$def_i]->required = $required;
             } else {
                 unset($attr[$def_i]);
             }
         }
     }
 }
 
 // vim: et sw=4 sts=4