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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form\Extension\Templating;
use Symfony\Component\Form\AbstractRendererEngine;
use Symfony\Component\Form\FormView;
use Symfony\Component\Templating\EngineInterface;
/**
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class TemplatingRendererEngine extends AbstractRendererEngine
{
/**
* @var EngineInterface
*/
private $engine;
public function __construct(EngineInterface $engine, array $defaultThemes = array())
{
parent::__construct($defaultThemes);
$this->engine = $engine;
}
/**
* {@inheritdoc}
*/
public function renderBlock(FormView $view, $resource, $blockName, array $variables = array())
{
return trim($this->engine->render($resource, $variables));
}
/**
* Loads the cache with the resource for a given block name.
*
* This implementation tries to load as few blocks as possible, since each block
* is represented by a template on the file system.
*
* @see getResourceForBlock()
*
* @param string $cacheKey The cache key of the form view.
* @param FormView $view The form view for finding the applying themes.
* @param string $blockName The name of the block to load.
*
* @return Boolean True if the resource could be loaded, false otherwise.
*/
protected function loadResourceForBlockName($cacheKey, FormView $view, $blockName)
{
// Recursively try to find the block in the themes assigned to $view,
// then of its parent form, then of the parent form of the parent and so on.
// When the root form is reached in this recursion, also the default
// themes are taken into account.
// Check each theme whether it contains the searched block
if (isset($this->themes[$cacheKey])) {
for ($i = count($this->themes[$cacheKey]) - 1; $i >= 0; --$i) {
if ($this->loadResourceFromTheme($cacheKey, $blockName, $this->themes[$cacheKey][$i])) {
return true;
}
}
}
// Check the default themes once we reach the root form without success
if (!$view->parent) {
for ($i = count($this->defaultThemes) - 1; $i >= 0; --$i) {
if ($this->loadResourceFromTheme($cacheKey, $blockName, $this->defaultThemes[$i])) {
return true;
}
}
}
// If we did not find anything in the themes of the current view, proceed
// with the themes of the parent view
if ($view->parent) {
$parentCacheKey = $view->parent->vars[self::CACHE_KEY_VAR];
if (!isset($this->resources[$parentCacheKey][$blockName])) {
$this->loadResourceForBlockName($parentCacheKey, $view->parent, $blockName);
}
// If a template exists in the parent themes, cache that template
// for the current theme as well to speed up further accesses
if ($this->resources[$parentCacheKey][$blockName]) {
$this->resources[$cacheKey][$blockName] = $this->resources[$parentCacheKey][$blockName];
return true;
}
}
// Cache that we didn't find anything to speed up further accesses
$this->resources[$cacheKey][$blockName] = false;
return false;
}
/**
* Tries to load the resource for a block from a theme.
*
* @param string $cacheKey The cache key for storing the resource.
* @param string $blockName The name of the block to load a resource for.
* @param mixed $theme The theme to load the block from.
*
* @return Boolean True if the resource could be loaded, false otherwise.
*/
protected function loadResourceFromTheme($cacheKey, $blockName, $theme)
{
if ($this->engine->exists($templateName = $theme.':'.$blockName.'.html.php')) {
$this->resources[$cacheKey][$blockName] = $templateName;
return true;
}
return false;
}
}
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