gistfile1.php

public function computeAssetUrl($assetType, $params, \Smarty_Internal_Template $template)
    {
        $file           = $params['file'];
        $assetOrigin    = isset($params['source']) ? $params['source'] : "0";
        $filters        = isset($params['filters']) ? $params['filters'] : '';
        $debug          = isset($params['debug']) ? trim(strtolower($params['debug'])) == 'true' : false;
        $webAssetTemplate = isset($params['template']) ? $params['template'] : false;

        /* we trick here relative thinking for file attribute */
        $file = ltrim($file, '/');
        while (substr($file, 0, 3) == '../') {
            $file = substr($file, 3);
        }

        $smartyParser = $template->smarty;
        $templateDefinition = $smartyParser->getTemplateDefinition();

        $templateDirectories = $smartyParser->getTemplateDirectories($templateDefinition->getType());

        if (! isset($templateDirectories[$templateDefinition->getName()][$assetOrigin])) {
            throw new \Exception("Failed to get real path of '/".dirname($file)."'");
        }

        $assetSource = $templateDirectories[$templateDefinition->getName()][$assetOrigin];
        if ($webAssetTemplate) {
            $assetSource = str_replace($templateDefinition->getName(), $webAssetTemplate, $assetSource);
        }

        $url = $this->assetsManager->processAsset(
            $assetSource . DS . $file,
            $assetSource . DS . self::$assetsDirectory,
            $this->web_root . $this->path_relative_to_web_root,
            $templateDefinition->getPath(),
            $assetOrigin,
            URL::getInstance()->absoluteUrl($this->path_relative_to_web_root, null, URL::PATH_TO_FILE /* path only */),
            $assetType,
            $filters,
            $debug
        );

        return $url;
    }