smarty/libs/sysplugins/smarty_resource_uncompiled.php

<?php
/**
 * Smarty Resource Plugin
 *
 * @package    Smarty
 * @subpackage TemplateResources
 * @author     Rodney Rehm
 */

/**
 * Smarty Resource Plugin
 * Base implementation for resource plugins that don't use the compiler
 *
 * @package    Smarty
 * @subpackage TemplateResources
 */
abstract class Smarty_Resource_Uncompiled extends Smarty_Resource
{
    /**
     * Flag that it's an uncompiled resource
     *
     * @var bool
     */
    public $uncompiled = true;

    /**
     * Resource does implement populateCompiledFilepath() method
     *
     * @var bool
     */
    public $hasCompiledHandler = true;

    /**
     * Render and output the template (without using the compiler)
     *
     * @param  Smarty_Template_Source   $source    source object
     * @param  Smarty_Internal_Template $_template template object
     *
     * @throws SmartyException          on failure
     */
    abstract public function renderUncompiled(Smarty_Template_Source $source, Smarty_Internal_Template $_template);

    /**
     * populate compiled object with compiled filepath
     *
     * @param Smarty_Template_Compiled $compiled  compiled object
     * @param Smarty_Internal_Template $_template template object (is ignored)
     */
    public function populateCompiledFilepath(Smarty_Template_Compiled $compiled, Smarty_Internal_Template $_template)
    {
        $compiled->filepath = false;
        $compiled->timestamp = false;
        $compiled->exists = false;
    }

    /**
     * render compiled template code
     *
     * @param Smarty_Internal_Template $_template
     *
     * @return string
     * @throws Exception
     */
    public function render($_template)
    {
        $level = ob_get_level();
        ob_start();
        try {
            $this->renderUncompiled($_template->source, $_template);
            return ob_get_clean();
        }
        catch (Exception $e) {
            while (ob_get_level() > $level) {
                ob_end_clean();
            }
            throw $e;
        }
    }
}