/home/ezyang/Dev/htmlpurifier/library/HTMLPurifier/LanguageFactory.php

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<?php

class HTMLPurifier_LanguageFactory
{

    public $cache;

    public $keys = array('fallback', 'messages', 'errorNames');

    protected $validator;

    protected $dir;

    protected $mergeable_keys_map = array('messages' => true, 'errorNames' => true);

    protected $mergeable_keys_list = array();

    public static function instance($prototype = null) {
        static $instance = null;
        if ($prototype !== null) {
            $instance = $prototype;
        } elseif ($instance === null || $prototype == true) {
            $instance = new HTMLPurifier_LanguageFactory();
            $instance->setup();
        }
        return $instance;
    }

    public function setup() {
        $this->validator = new HTMLPurifier_AttrDef_Lang();
        $this->dir = HTMLPURIFIER_PREFIX . '/HTMLPurifier';
    }

    public function create($config, $context, $code = false) {

        // validate language code
        if ($code === false) {
            $code = $this->validator->validate(
              $config->get('Core.Language'), $config, $context
            );
        } else {
            $code = $this->validator->validate($code, $config, $context);
        }
        if ($code === false) $code = 'en'; // malformed code becomes English

        $pcode = str_replace('-', '_', $code); // make valid PHP classname
        static $depth = 0; // recursion protection

        if ($code == 'en') {
            $lang = new HTMLPurifier_Language($config, $context);
        } else {
            $class = 'HTMLPurifier_Language_' . $pcode;
            $file  = $this->dir . '/Language/classes/' . $code . '.php';
            if (file_exists($file) || class_exists($class, false)) {
                $lang = new $class($config, $context);
            } else {
                // Go fallback
                $raw_fallback = $this->getFallbackFor($code);
                $fallback = $raw_fallback ? $raw_fallback : 'en';
                $depth++;
                $lang = $this->create($config, $context, $fallback);
                if (!$raw_fallback) {
                    $lang->error = true;
                }
                $depth--;
            }
        }

        $lang->code = $code;

        return $lang;

    }

    public function getFallbackFor($code) {
        $this->loadLanguage($code);
        return $this->cache[$code]['fallback'];
    }

    public function loadLanguage($code) {
        static $languages_seen = array(); // recursion guard

        // abort if we've already loaded it
        if (isset($this->cache[$code])) return;

        // generate filename
        $filename = $this->dir . '/Language/messages/' . $code . '.php';

        // default fallback : may be overwritten by the ensuing include
        $fallback = ($code != 'en') ? 'en' : false;

        // load primary localisation
        if (!file_exists($filename)) {
            // skip the include: will rely solely on fallback
            $filename = $this->dir . '/Language/messages/en.php';
            $cache = array();
        } else {
            include $filename;
            $cache = compact($this->keys);
        }

        // load fallback localisation
        if (!empty($fallback)) {

            // infinite recursion guard
            if (isset($languages_seen[$code])) {
                trigger_error('Circular fallback reference in language ' .
                    $code, E_USER_ERROR);
                $fallback = 'en';
            }
            $language_seen[$code] = true;

            // load the fallback recursively
            $this->loadLanguage($fallback);
            $fallback_cache = $this->cache[$fallback];

            // merge fallback with current language
            foreach ( $this->keys as $key ) {
                if (isset($cache[$key]) && isset($fallback_cache[$key])) {
                    if (isset($this->mergeable_keys_map[$key])) {
                        $cache[$key] = $cache[$key] + $fallback_cache[$key];
                    } elseif (isset($this->mergeable_keys_list[$key])) {
                        $cache[$key] = array_merge( $fallback_cache[$key], $cache[$key] );
                    }
                } else {
                    $cache[$key] = $fallback_cache[$key];
                }
            }

        }

        // save to cache for later retrieval
        $this->cache[$code] = $cache;

        return;
    }

}

// vim: et sw=4 sts=4