library/HTMLPurifier/ConfigSchema.php

   1 <?php
   2
   3 /**
   4  * Configuration definition, defines directives and their defaults.
   5  */
   6 class HTMLPurifier_ConfigSchema {
   7
   8     /**
   9      * Defaults of the directives and namespaces.
  10      * @note This shares the exact same structure as HTMLPurifier_Config::$conf
  11      */
  12     public $defaults = array();
  13
  14     /**
  15      * The default property list. Do not edit this property list.
  16      */
  17     public $defaultPlist;
  18
  19     /**
  20      * Definition of the directives. The structure of this is:
  21      *
  22      *  array(
  23      *      'Namespace' => array(
  24      *          'Directive' => new stdclass(),
  25      *      )
  26      *  )
  27      *
  28      * The stdclass may have the following properties:
  29      *
  30      *  - If isAlias isn't set:
  31      *      - type: Integer type of directive, see HTMLPurifier_VarParser for definitions
  32      *      - allow_null: If set, this directive allows null values
  33      *      - aliases: If set, an associative array of value aliases to real values
  34      *      - allowed: If set, a lookup array of allowed (string) values
  35      *  - If isAlias is set:
  36      *      - namespace: Namespace this directive aliases to
  37      *      - name: Directive name this directive aliases to
  38      *
  39      * In certain degenerate cases, stdclass will actually be an integer. In
  40      * that case, the value is equivalent to an stdclass with the type
  41      * property set to the integer. If the integer is negative, type is
  42      * equal to the absolute value of integer, and allow_null is true.
  43      *
  44      * This class is friendly with HTMLPurifier_Config. If you need introspection
  45      * about the schema, you're better of using the ConfigSchema_Interchange,
  46      * which uses more memory but has much richer information.
  47      */
  48     public $info = array();
  49
  50     /**
  51      * Application-wide singleton
  52      */
  53     static protected $singleton;
  54
  55     public function __construct() {
  56         $this->defaultPlist = new HTMLPurifier_PropertyList();
  57     }
  58
  59     /**
  60      * Unserializes the default ConfigSchema.
  61      */
  62     public static function makeFromSerial() {
  63         return unserialize(file_get_contents(HTMLPURIFIER_PREFIX . '/HTMLPurifier/ConfigSchema/schema.ser'));
  64     }
  65
  66     /**
  67      * Retrieves an instance of the application-wide configuration definition.
  68      */
  69     public static function instance($prototype = null) {
  70         if ($prototype !== null) {
  71             HTMLPurifier_ConfigSchema::$singleton = $prototype;
  72         } elseif (HTMLPurifier_ConfigSchema::$singleton === null || $prototype === true) {
  73             HTMLPurifier_ConfigSchema::$singleton = HTMLPurifier_ConfigSchema::makeFromSerial();
  74         }
  75         return HTMLPurifier_ConfigSchema::$singleton;
  76     }
  77
  78     /**
  79      * Defines a directive for configuration
  80      * @warning Will fail of directive's namespace is defined.
  81      * @warning This method's signature is slightly different from the legacy
  82      *          define() static method! Beware!
  83      * @param $namespace Namespace the directive is in
  84      * @param $name Key of directive
  85      * @param $default Default value of directive
  86      * @param $type Allowed type of the directive. See
  87      *      HTMLPurifier_DirectiveDef::$type for allowed values
  88      * @param $allow_null Whether or not to allow null values
  89      */
  90     public function add($key, $default, $type, $allow_null) {
  91         $obj = new stdclass();
  92         $obj->type = is_int($type) ? $type : HTMLPurifier_VarParser::$types[$type];
  93         if ($allow_null) $obj->allow_null = true;
  94         $this->info[$key] = $obj;
  95         $this->defaults[$key] = $default;
  96         $this->defaultPlist->set($key, $default);
  97     }
  98
  99     /**
 100      * Defines a directive value alias.
 101      *
 102      * Directive value aliases are convenient for developers because it lets
 103      * them set a directive to several values and get the same result.
 104      * @param $namespace Directive's namespace
 105      * @param $name Name of Directive
 106      * @param $aliases Hash of aliased values to the real alias
 107      */
 108     public function addValueAliases($key, $aliases) {
 109         if (!isset($this->info[$key]->aliases)) {
 110             $this->info[$key]->aliases = array();
 111         }
 112         foreach ($aliases as $alias => $real) {
 113             $this->info[$key]->aliases[$alias] = $real;
 114         }
 115     }
 116
 117     /**
 118      * Defines a set of allowed values for a directive.
 119      * @warning This is slightly different from the corresponding static
 120      *          method definition.
 121      * @param $namespace Namespace of directive
 122      * @param $name Name of directive
 123      * @param $allowed Lookup array of allowed values
 124      */
 125     public function addAllowedValues($key, $allowed) {
 126         $this->info[$key]->allowed = $allowed;
 127     }
 128
 129     /**
 130      * Defines a directive alias for backwards compatibility
 131      * @param $namespace
 132      * @param $name Directive that will be aliased
 133      * @param $new_namespace
 134      * @param $new_name Directive that the alias will be to
 135      */
 136     public function addAlias($key, $new_key) {
 137         $obj = new stdclass;
 138         $obj->key = $new_key;
 139         $obj->isAlias = true;
 140         $this->info[$key] = $obj;
 141     }
 142
 143     /**
 144      * Replaces any stdclass that only has the type property with type integer.
 145      */
 146     public function postProcess() {
 147         foreach ($this->info as $key => $v) {
 148             if (count((array) $v) == 1) {
 149                 $this->info[$key] = $v->type;
 150             } elseif (count((array) $v) == 2 && isset($v->allow_null)) {
 151                 $this->info[$key] = -$v->type;
 152             }
 153         }
 154     }
 155
 156 }
 157
 158 // vim: et sw=4 sts=4