library/HTMLPurifier/Context.php

   1 <?php
   2
   3 /**
   4  * Registry object that contains information about the current context.
   5  * @warning Is a bit buggy when variables are set to null: it thinks
   6  *          they don't exist! So use false instead, please.
   7  * @note Since the variables Context deals with may not be objects,
   8  *       references are very important here! Do not remove!
   9  */
  10 class HTMLPurifier_Context
  11 {
  12
  13     /**
  14      * Private array that stores the references.
  15      */
  16     private $_storage = array();
  17
  18     /**
  19      * Registers a variable into the context.
  20      * @param $name String name
  21      * @param $ref Reference to variable to be registered
  22      */
  23     public function register($name, &$ref) {
  24         if (isset($this->_storage[$name])) {
  25             trigger_error("Name $name produces collision, cannot re-register",
  26                           E_USER_ERROR);
  27             return;
  28         }
  29         $this->_storage[$name] =& $ref;
  30     }
  31
  32     /**
  33      * Retrieves a variable reference from the context.
  34      * @param $name String name
  35      * @param $ignore_error Boolean whether or not to ignore error
  36      */
  37     public function &get($name, $ignore_error = false) {
  38         if (!isset($this->_storage[$name])) {
  39             if (!$ignore_error) {
  40                 trigger_error("Attempted to retrieve non-existent variable $name",
  41                               E_USER_ERROR);
  42             }
  43             $var = null; // so we can return by reference
  44             return $var;
  45         }
  46         return $this->_storage[$name];
  47     }
  48
  49     /**
  50      * Destorys a variable in the context.
  51      * @param $name String name
  52      */
  53     public function destroy($name) {
  54         if (!isset($this->_storage[$name])) {
  55             trigger_error("Attempted to destroy non-existent variable $name",
  56                           E_USER_ERROR);
  57             return;
  58         }
  59         unset($this->_storage[$name]);
  60     }
  61
  62     /**
  63      * Checks whether or not the variable exists.
  64      * @param $name String name
  65      */
  66     public function exists($name) {
  67         return isset($this->_storage[$name]);
  68     }
  69
  70     /**
  71      * Loads a series of variables from an associative array
  72      * @param $context_array Assoc array of variables to load
  73      */
  74     public function loadArray($context_array) {
  75         foreach ($context_array as $key => $discard) {
  76             $this->register($key, $context_array[$key]);
  77         }
  78     }
  79
  80 }
  81
  82 // vim: et sw=4 sts=4