<?php
/**
 * Loop through translation directory for given locale, find all PO files,
 * and generate key/value pairs from ids and strings therein.
 *
 * @return array
 * @params boolean $default
 * @author Marissa Hogue
 */
function i18nPOStrings($default = false) {
    static $messages = array();

    if ($default) {
        $locale = get_instance()->config->item('language_ui_default')->url_name;
    }
    else {
        $locale = get_instance()->config->item('language_ui')->url_name;
    }

    if (!array_key_exists($locale, $messages) || $messages[$locale] === null) {
        $strings = array();
        $dir     = APPPATH . 'language/messages/*/';
        $files    = glob($dir . '*.' . $locale . '.po');
        $msgid    = null;
        $msgstr   = '';

        foreach ($files as $file) {
            $lines = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
            foreach ($lines as $line) {
                if (preg_match("/^msgid/", $line)) {
                    if ($msgid) {
                        $strings[$msgid] = $msgstr;
                        $msgstr = '';
                    }
                    $msgid = preg_replace("/^msgid \"|\"$/", "", $line);
                }
                elseif (preg_match("/^msgstr/", $line)) {
                    $msgstr = preg_replace("/^msgstr \"|\"$/", "", $line);
                }
                $strings[$msgid] = $msgstr;
            }
        }
        $messages[$locale] = $strings;
    }
    return $messages[$locale];
}

/**
 * Get all UI Strings for current locale, replacing empty msgids with default value.
 *
 * @return array
 * @author Marissa Hogue
 */
function getAllUIStrings() {
    $messages = array();
    $current = i18nPOStrings();
    $default = i18nPOStrings(true);

    if ($current !== $default) {
        $messages = array_merge($default, $current);
    } else {
        $messages = $default;
    }
    return $messages;
}

?>