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 <?php
 
 /**
  * Configuration definition, defines directives and their defaults.
  */
 class HTMLPurifier_ConfigSchema
 {
     /**
      * Defaults of the directives and namespaces.
      * @type array
      * @note This shares the exact same structure as HTMLPurifier_Config::$conf
      */
     public $defaults = array();
 
     /**
      * The default property list. Do not edit this property list.
      * @type array
      */
     public $defaultPlist;
 
     /**
      * Definition of the directives.
      * The structure of this is:
      *
      *  array(
      *      'Namespace' => array(
      *          'Directive' => new stdClass(),
      *      )
      *  )
      *
      * The stdClass may have the following properties:
      *
      *  - If isAlias isn't set:
      *      - type: Integer type of directive, see HTMLPurifier_VarParser for definitions
      *      - allow_null: If set, this directive allows null values
      *      - aliases: If set, an associative array of value aliases to real values
      *      - allowed: If set, a lookup array of allowed (string) values
      *  - If isAlias is set:
      *      - namespace: Namespace this directive aliases to
      *      - name: Directive name this directive aliases to
      *
      * In certain degenerate cases, stdClass will actually be an integer. In
      * that case, the value is equivalent to an stdClass with the type
      * property set to the integer. If the integer is negative, type is
      * equal to the absolute value of integer, and allow_null is true.
      *
      * This class is friendly with HTMLPurifier_Config. If you need introspection
      * about the schema, you're better of using the ConfigSchema_Interchange,
      * which uses more memory but has much richer information.
      * @type array
      */
     public $info = array();
 
     /**
      * Application-wide singleton
      * @type HTMLPurifier_ConfigSchema
      */
     protected static $singleton;
 
     public function __construct()
     {
         $this->defaultPlist = new HTMLPurifier_PropertyList();
     }
 
     /**
      * Unserializes the default ConfigSchema.
      * @return HTMLPurifier_ConfigSchema
      */
     public static function makeFromSerial()
     {
         $contents = file_get_contents(HTMLPURIFIER_PREFIX . '/HTMLPurifier/ConfigSchema/schema.ser');
         $r = unserialize($contents);
         if (!$r) {
             $hash = sha1($contents);
             trigger_error("Unserialization of configuration schema failed, sha1 of file was $hash", E_USER_ERROR);
         }
         return $r;
     }
 
     /**
      * Retrieves an instance of the application-wide configuration definition.
      * @param HTMLPurifier_ConfigSchema $prototype
      * @return HTMLPurifier_ConfigSchema
      */
     public static function instance($prototype = null)
     {
         if ($prototype !== null) {
             HTMLPurifier_ConfigSchema::$singleton = $prototype;
         } elseif (HTMLPurifier_ConfigSchema::$singleton === null || $prototype === true) {
             HTMLPurifier_ConfigSchema::$singleton = HTMLPurifier_ConfigSchema::makeFromSerial();
         }
         return HTMLPurifier_ConfigSchema::$singleton;
     }
 
     /**
      * Defines a directive for configuration
      * @warning Will fail of directive's namespace is defined.
      * @warning This method's signature is slightly different from the legacy
      *          define() static method! Beware!
      * @param string $key Name of directive
      * @param mixed $default Default value of directive
      * @param string $type Allowed type of the directive. See
      *      HTMLPurifier_DirectiveDef::$type for allowed values
      * @param bool $allow_null Whether or not to allow null values
      */
     public function add($key, $default, $type, $allow_null)
     {
         $obj = new stdClass();
         $obj->type = is_int($type) ? $type : HTMLPurifier_VarParser::$types[$type];
         if ($allow_null) {
             $obj->allow_null = true;
         }
         $this->info[$key] = $obj;
         $this->defaults[$key] = $default;
         $this->defaultPlist->set($key, $default);
     }
 
     /**
      * Defines a directive value alias.
      *
      * Directive value aliases are convenient for developers because it lets
      * them set a directive to several values and get the same result.
      * @param string $key Name of Directive
      * @param array $aliases Hash of aliased values to the real alias
      */
     public function addValueAliases($key, $aliases)
     {
         if (!isset($this->info[$key]->aliases)) {
             $this->info[$key]->aliases = array();
         }
         foreach ($aliases as $alias => $real) {
             $this->info[$key]->aliases[$alias] = $real;
         }
     }
 
     /**
      * Defines a set of allowed values for a directive.
      * @warning This is slightly different from the corresponding static
      *          method definition.
      * @param string $key Name of directive
      * @param array $allowed Lookup array of allowed values
      */
     public function addAllowedValues($key, $allowed)
     {
         $this->info[$key]->allowed = $allowed;
     }
 
     /**
      * Defines a directive alias for backwards compatibility
      * @param string $key Directive that will be aliased
      * @param string $new_key Directive that the alias will be to
      */
     public function addAlias($key, $new_key)
     {
         $obj = new stdClass;
         $obj->key = $new_key;
         $obj->isAlias = true;
         $this->info[$key] = $obj;
     }
 
     /**
      * Replaces any stdClass that only has the type property with type integer.
      */
     public function postProcess()
     {
         foreach ($this->info as $key => $v) {
             if (count((array) $v) == 1) {
                 $this->info[$key] = $v->type;
             } elseif (count((array) $v) == 2 && isset($v->allow_null)) {
                 $this->info[$key] = -$v->type;
             }
         }
     }
 }
 
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