vendor/ezyang/htmlpurifier/library/HTMLPurifier/LanguageFactory.php

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<?php

/**
 * Class responsible for generating HTMLPurifier_Language objects, managing
 * caching and fallbacks.
 * @note Thanks to MediaWiki for the general logic, although this version
 *       has been entirely rewritten
 * @todo Serialized cache for languages
 */
class HTMLPurifier_LanguageFactory
{

    /**
     * Cache of language code information used to load HTMLPurifier_Language objects.
     * Structure is: $factory->cache[$language_code][$key] = $value
     * @type array
     */
    public $cache;

    /**
     * Valid keys in the HTMLPurifier_Language object. Designates which
     * variables to slurp out of a message file.
     * @type array
     */
    public $keys = array('fallback', 'messages', 'errorNames');

    /**
     * Instance to validate language codes.
     * @type HTMLPurifier_AttrDef_Lang
     *
     */
    protected $validator;

    /**
     * Cached copy of dirname(__FILE__), directory of current file without
     * trailing slash.
     * @type string
     */
    protected $dir;

    /**
     * Keys whose contents are a hash map and can be merged.
     * @type array
     */
    protected $mergeable_keys_map = array('messages' => true, 'errorNames' => true);

    /**
     * Keys whose contents are a list and can be merged.
     * @value array lookup
     */
    protected $mergeable_keys_list = array();

    /**
     * Retrieve sole instance of the factory.
     * @param HTMLPurifier_LanguageFactory $prototype Optional prototype to overload sole instance with,
     *                   or bool true to reset to default factory.
     * @return HTMLPurifier_LanguageFactory
     */
    public static function instance($prototype = null)
    {