config.php

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        $this->serials[$namespace] = false;
    }
    
    /**
     * Convenience function for error reporting
     * @private
     */
    function _listify($lookup) {
        $list = array();
        foreach ($lookup as $name => $b) $list[] = $name;
        return implode(', ', $list);
    }
    
    /**
     * Retrieves reference to the HTML definition.
     * @param $raw Return a copy that has not been setup yet. Must be
     *             called before it's been setup, otherwise won't work.
     */
    function &getHTMLDefinition($raw = false) {
        $def =& $this->getDefinition('HTML', $raw);
        return $def; // prevent PHP 4.4.0 from complaining
    }
    
    /**
     * Retrieves reference to the CSS definition
     */
    function &getCSSDefinition($raw = false) {
        $def =& $this->getDefinition('CSS', $raw);
        return $def;
    }
    
    /**
     * Retrieves a definition
     * @param $type Type of definition: HTML, CSS, etc
     * @param $raw  Whether or not definition should be returned raw
     */
    function &getDefinition($type, $raw = false) {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
        $factory = HTMLPurifier_DefinitionCacheFactory::instance();
        $cache = $factory->create($type, $this);
        if (!$raw) {
            // see if we can quickly supply a definition
            if (!empty($this->definitions[$type])) {
                if (!$this->definitions[$type]->setup) {
                    $this->definitions[$type]->setup($this);
                    $cache->set($this->definitions[$type], $this);
                }
                return $this->definitions[$type];
            }
            // memory check missed, try cache
            $this->definitions[$type] = $cache->get($this);
            if ($this->definitions[$type]) {
                // definition in cache, return it
                return $this->definitions[$type];
            }
        } elseif (
            !empty($this->definitions[$type]) &&
            !$this->definitions[$type]->setup
        ) {
            // raw requested, raw in memory, quick return
            return $this->definitions[$type];
        }
        // quick checks failed, let's create the object
        if ($type == 'HTML') {
            $this->definitions[$type] = new HTMLPurifier_HTMLDefinition();
        } elseif ($type == 'CSS') {
            $this->definitions[$type] = new HTMLPurifier_CSSDefinition();
        } elseif ($type == 'URI') {
            $this->definitions[$type] = new HTMLPurifier_URIDefinition();
        } else {
            trigger_error("Definition of $type type not supported");
            $false = false;
            return $false;
        }
        // quick abort if raw
        if ($raw) {
            if (is_null($this->get($type, 'DefinitionID'))) {
                // fatally error out if definition ID not set
                trigger_error("Cannot retrieve raw version without specifying %$type.DefinitionID", E_USER_ERROR);
                $false = new HTMLPurifier_Error();
                return $false;
            }
            return $this->definitions[$type];
        }
        // set it up
        $this->definitions[$type]->setup($this);
        // save in cache
        $cache->set($this->definitions[$type], $this);
        return $this->definitions[$type];
    }
    
    /**
     * Loads configuration values from an array with the following structure:
     * Namespace.Directive => Value
     * @param $config_array Configuration associative array
     */
    function loadArray($config_array) {
        if ($this->isFinalized('Cannot load directives after finalization')) return;
        foreach ($config_array as $key => $value) {
            $key = str_replace('_', '.', $key);
            if (strpos($key, '.') !== false) {
                // condensed form
                list($namespace, $directive) = explode('.', $key);
                $this->set($namespace, $directive, $value);
            } else {
                $namespace = $key;
                $namespace_values = $value;
                foreach ($namespace_values as $directive => $value) {
                    $this->set($namespace, $directive, $value);
                }
            }
        }
    }
    
    /**
     * Returns a list of array(namespace, directive) for all directives
     * that are allowed in a web-form context as per an allowed
     * namespaces/directives list.
     * @param $allowed List of allowed namespaces/directives
     * @static
     */
    function getAllowedDirectivesForForm($allowed) {
        $schema = HTMLPurifier_ConfigSchema::instance();
        if ($allowed !== true) {
             if (is_string($allowed)) $allowed = array($allowed);
             $allowed_ns = array();
             $allowed_directives = array();
             $blacklisted_directives = array();
             foreach ($allowed as $ns_or_directive) {
                 if (strpos($ns_or_directive, '.') !== false) {
                     // directive
                     if ($ns_or_directive[0] == '-') {
                         $blacklisted_directives[substr($ns_or_directive, 1)] = true;
                     } else {
                         $allowed_directives[$ns_or_directive] = true;
                     }
                 } else {
                     // namespace
                     $allowed_ns[$ns_or_directive] = true;
                 }
             }
        }
        $ret = array();
        foreach ($schema->info as $ns => $keypairs) {
            foreach ($keypairs as $directive => $def) {
                if ($allowed !== true) {
                    if (isset($blacklisted_directives["$ns.$directive"])) continue;
                    if (!isset($allowed_directives["$ns.$directive"]) && !isset($allowed_ns[$ns])) continue;
                }
                if ($def->class == 'alias') continue;
                if ($directive == 'DefinitionID' || $directive == 'DefinitionRev') continue;
                $ret[] = array($ns, $directive);
            }
        }
        return $ret;
    }
    
    /**
     * Loads configuration values from $_GET/$_POST that were posted
     * via ConfigForm
     * @param $array $_GET or $_POST array to import
     * @param $index Index/name that the config variables are in
     * @param $allowed List of allowed namespaces/directives 
     * @param $mq_fix Boolean whether or not to enable magic quotes fix
     * @static
     */
    function loadArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
        $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix);
        $config = HTMLPurifier_Config::create($ret);
        return $config;
    }
    
    /**
     * Merges in configuration values from $_GET/$_POST to object. NOT STATIC.
     * @note Same parameters as loadArrayFromForm
     */
    function mergeArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
         $ret = HTMLPurifier_Config::prepareArrayFromForm($array, $index, $allowed, $mq_fix);
         $this->loadArray($ret);
    }
    
    /**
     * Prepares an array from a form into something usable for the more
     * strict parts of HTMLPurifier_Config
     * @static
     */
    function prepareArrayFromForm($array, $index, $allowed = true, $mq_fix = true) {
        $array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array();
        $mq = get_magic_quotes_gpc() && $mq_fix;
        
        $allowed = HTMLPurifier_Config::getAllowedDirectivesForForm($allowed);
        $ret = array();
        foreach ($allowed as $key) {
            list($ns, $directive) = $key;
            $skey = "$ns.$directive";
            if (!empty($array["Null_$skey"])) {
                $ret[$ns][$directive] = null;
                continue;
            }
            if (!isset($array[$skey])) continue;
            $value = $mq ? stripslashes($array[$skey]) : $array[$skey];
            $ret[$ns][$directive] = $value;
        }
        return $ret;
    }
    
    /**
     * Loads configuration values from an ini file
     * @param $filename Name of ini file
     */
    function loadIni($filename) {
        if ($this->isFinalized('Cannot load directives after finalization')) return;
        $array = parse_ini_file($filename, true);
        $this->loadArray($array);
    }
    
    /**
     * Checks whether or not the configuration object is finalized.
     * @param $error String error message, or false for no error
     */
    function isFinalized($error = false) {
        if ($this->finalized && $error) {
            trigger_error($error, E_USER_ERROR);
        }
        return $this->finalized;
    }
    
    /**
     * Finalizes configuration only if auto finalize is on and not
     * already finalized
     */
    function autoFinalize() {
        if (!$this->finalized && $this->autoFinalize) $this->finalize();
    }
    
    /**
     * Finalizes a configuration object, prohibiting further change
     */
    function finalize() {
        $this->finalized = true;
    }
    
}