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vendor/symfony/twig-bridge/Form/TwigRendererEngine.php
vendored
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182
vendor/symfony/twig-bridge/Form/TwigRendererEngine.php
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Bridge\Twig\Form;
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use Symfony\Component\Form\AbstractRendererEngine;
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use Symfony\Component\Form\FormView;
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use Twig\Environment;
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use Twig\Template;
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/**
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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class TwigRendererEngine extends AbstractRendererEngine
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{
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/**
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* @var Environment
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*/
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private $environment;
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/**
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* @var Template
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*/
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private $template;
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public function __construct(array $defaultThemes, Environment $environment)
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{
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parent::__construct($defaultThemes);
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$this->environment = $environment;
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}
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/**
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* {@inheritdoc}
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*/
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public function renderBlock(FormView $view, $resource, string $blockName, array $variables = [])
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{
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$cacheKey = $view->vars[self::CACHE_KEY_VAR];
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$context = $this->environment->mergeGlobals($variables);
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ob_start();
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// By contract,This method can only be called after getting the resource
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// (which is passed to the method). Getting a resource for the first time
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// (with an empty cache) is guaranteed to invoke loadResourcesFromTheme(),
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// where the property $template is initialized.
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// We do not call renderBlock here to avoid too many nested level calls
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// (XDebug limits the level to 100 by default)
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$this->template->displayBlock($blockName, $context, $this->resources[$cacheKey]);
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return ob_get_clean();
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}
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/**
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* Loads the cache with the resource for a given block name.
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*
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* This implementation eagerly loads all blocks of the themes assigned to the given view
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* and all of its ancestors views. This is necessary, because Twig receives the
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* list of blocks later. At that point, all blocks must already be loaded, for the
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* case that the function "block()" is used in the Twig template.
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*
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* @see getResourceForBlock()
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*
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* @return bool
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*/
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protected function loadResourceForBlockName(string $cacheKey, FormView $view, string $blockName)
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{
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// The caller guarantees that $this->resources[$cacheKey][$block] is
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// not set, but it doesn't have to check whether $this->resources[$cacheKey]
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// is set. If $this->resources[$cacheKey] is set, all themes for this
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// $cacheKey are already loaded (due to the eager population, see doc comment).
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if (isset($this->resources[$cacheKey])) {
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// As said in the previous, the caller guarantees that
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// $this->resources[$cacheKey][$block] is not set. Since the themes are
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// already loaded, it can only be a non-existing block.
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$this->resources[$cacheKey][$blockName] = false;
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return false;
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}
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// Recursively try to find the block in the themes assigned to $view,
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// then of its parent view, then of the parent view of the parent and so on.
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// When the root view is reached in this recursion, also the default
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// themes are taken into account.
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// Check each theme whether it contains the searched block
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if (isset($this->themes[$cacheKey])) {
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for ($i = \count($this->themes[$cacheKey]) - 1; $i >= 0; --$i) {
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$this->loadResourcesFromTheme($cacheKey, $this->themes[$cacheKey][$i]);
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// CONTINUE LOADING (see doc comment)
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}
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}
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// Check the default themes once we reach the root view without success
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if (!$view->parent) {
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if (!isset($this->useDefaultThemes[$cacheKey]) || $this->useDefaultThemes[$cacheKey]) {
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for ($i = \count($this->defaultThemes) - 1; $i >= 0; --$i) {
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$this->loadResourcesFromTheme($cacheKey, $this->defaultThemes[$i]);
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// CONTINUE LOADING (see doc comment)
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}
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}
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}
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// Proceed with the themes of the parent view
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if ($view->parent) {
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$parentCacheKey = $view->parent->vars[self::CACHE_KEY_VAR];
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if (!isset($this->resources[$parentCacheKey])) {
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$this->loadResourceForBlockName($parentCacheKey, $view->parent, $blockName);
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}
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// EAGER CACHE POPULATION (see doc comment)
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foreach ($this->resources[$parentCacheKey] as $nestedBlockName => $resource) {
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if (!isset($this->resources[$cacheKey][$nestedBlockName])) {
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$this->resources[$cacheKey][$nestedBlockName] = $resource;
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}
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}
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}
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// Even though we loaded the themes, it can happen that none of them
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// contains the searched block
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if (!isset($this->resources[$cacheKey][$blockName])) {
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// Cache that we didn't find anything to speed up further accesses
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$this->resources[$cacheKey][$blockName] = false;
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}
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return false !== $this->resources[$cacheKey][$blockName];
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}
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/**
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* Loads the resources for all blocks in a theme.
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*
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* @param mixed $theme The theme to load the block from. This parameter
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* is passed by reference, because it might be necessary
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* to initialize the theme first. Any changes made to
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* this variable will be kept and be available upon
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* further calls to this method using the same theme.
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*/
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protected function loadResourcesFromTheme(string $cacheKey, &$theme)
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{
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if (!$theme instanceof Template) {
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/* @var Template $theme */
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$theme = $this->environment->load($theme)->unwrap();
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}
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if (null === $this->template) {
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// Store the first Template instance that we find so that
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// we can call displayBlock() later on. It doesn't matter *which*
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// template we use for that, since we pass the used blocks manually
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// anyway.
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$this->template = $theme;
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}
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// Use a separate variable for the inheritance traversal, because
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// theme is a reference and we don't want to change it.
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$currentTheme = $theme;
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$context = $this->environment->mergeGlobals([]);
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// The do loop takes care of template inheritance.
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// Add blocks from all templates in the inheritance tree, but avoid
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// overriding blocks already set.
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do {
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foreach ($currentTheme->getBlocks() as $block => $blockData) {
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if (!isset($this->resources[$cacheKey][$block])) {
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// The resource given back is the key to the bucket that
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// contains this block.
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$this->resources[$cacheKey][$block] = $blockData;
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}
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}
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} while (false !== $currentTheme = $currentTheme->getParent($context));
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}
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}
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