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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
- {
- 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 $blockName The name of the block to load
- *
- * @return bool True if the resource could be loaded, false otherwise
- */
- protected function loadResourceForBlockName($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 $theme The theme to load the block from
- *
- * @return bool True if the resource could be loaded, false otherwise
- */
- protected function loadResourceFromTheme($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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