library/HTMLPurifier/EntityLookup.php

   1 <?php
   2
   3 /**
   4  * Object that provides entity lookup table from entity name to character
   5  */
   6 class HTMLPurifier_EntityLookup {
   7
   8     /**
   9      * Assoc array of entity name to character represented.
  10      */
  11     public $table;
  12
  13     /**
  14      * Sets up the entity lookup table from the serialized file contents.
  15      * @note The serialized contents are versioned, but were generated
  16      *       using the maintenance script generate_entity_file.php
  17      * @warning This is not in constructor to help enforce the Singleton
  18      */
  19     public function setup($file = false) {
  20         if (!$file) {
  21             $file = HTMLPURIFIER_PREFIX . '/HTMLPurifier/EntityLookup/entities.ser';
  22         }
  23         $this->table = unserialize(file_get_contents($file));
  24     }
  25
  26     /**
  27      * Retrieves sole instance of the object.
  28      * @param Optional prototype of custom lookup table to overload with.
  29      */
  30     public static function instance($prototype = false) {
  31         // no references, since PHP doesn't copy unless modified
  32         static $instance = null;
  33         if ($prototype) {
  34             $instance = $prototype;
  35         } elseif (!$instance) {
  36             $instance = new HTMLPurifier_EntityLookup();
  37             $instance->setup();
  38         }
  39         return $instance;
  40     }
  41
  42 }
  43
  44 // vim: et sw=4 sts=4