helper = plugin_load('helper', 'parserfunctions'); } /** @inheritDoc */ public function register(EventHandler $controller) { $controller->register_hook( 'PARSER_WIKITEXT_PREPROCESS', 'BEFORE', $this, 'handlePreprocess' ); } public function handlePreprocess(Event $event) { $text = $event->data; $text = $this->processParserFunctions($text); $event->data = $text; } private function processParserFunctions($text) { // 1. Protects escaped blocks $protectedBlocks = []; /* The "s" modifier makes . catch line breaks. * The "i" modifier ignores case (if someone writes

).
         */
        $text = preg_replace_callback('/%%.*?%%|<(nowiki|code|file|html)[^>]*>.*?<\/\1>/si', function ($matches) use (&$protectedBlocks) {
            $key = '@@ESC' . count($protectedBlocks) . '@@';
            $protectedBlocks[$key] = $matches[0];
            return $key;
        }, $text);

        // 2. Processes functions normally
        $index = 0;
        while (($match = $this->extractBalancedFunction($text)) !== false) {
            $resolved = plugin_load('syntax', 'parserfunctions')->resolveFunction($match);
            $text = str_replace($match, $resolved, $text);
            $index++;
        }

        // 3. Restores protected blocks
        foreach ($protectedBlocks as $key => $original) {
            $text = str_replace($key, $original, $text);
        }

        return $text;
    }

    private function extractBalancedFunction($text)
    {
        $start = strpos($text, '{{#');
        if ($start === false) return false;

        $level = 0;
        $length = strlen($text);
        for ($i = $start; $i < $length - 2; $i++) {
            if (substr($text, $i, 3) === '{{#') {
                $level++;
                $i += 2;
            } elseif (substr($text, $i, 3) === '#}}') {
                $level--;
                $i += 2;

                if ($level === 0) {
                    return substr($text, $start, $i - $start + 1);
                }
            }
        }

        return false; // Malformed
    }
}