File Content: FormRenderer.php <?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; use Symfony\Component\Form\Exception\LogicException; use Symfony\Component\Form\Exception\BadMethodCallException; use Symfony\Component\Form\Exception\UnexpectedTypeException; use Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderAdapter; use Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface; use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface; /** * Renders a form into HTML using a rendering engine. * * @author Bernhard Schussek <bschussek@gmail.com> */ class FormRenderer implements FormRendererInterface { const CACHE_KEY_VAR = 'unique_block_prefix'; /** * @var FormRendererEngineInterface */ private $engine; /** * @var CsrfTokenManagerInterface */ private $csrfTokenManager; /** * @var array */ private $blockNameHierarchyMap = array(); /** * @var array */ private $hierarchyLevelMap = array(); /** * @var array */ private $variableStack = array(); /** * Constructor. * * @param FormRendererEngineInterface $engine * @param CsrfTokenManagerInterface|null $csrfTokenManager * * @throws UnexpectedTypeException */ public function __construct(FormRendererEngineInterface $engine, $csrfTokenManager = null) { if ($csrfTokenManager instanceof CsrfProviderInterface) { $csrfTokenManager = new CsrfProviderAdapter($csrfTokenManager); } elseif (null !== $csrfTokenManager && !$csrfTokenManager instanceof CsrfTokenManagerInterface) { throw new UnexpectedTypeException($csrfTokenManager, 'CsrfProviderInterface or CsrfTokenManagerInterface or null'); } $this->engine = $engine; $this->csrfTokenManager = $csrfTokenManager; } /** * {@inheritdoc} */ public function getEngine() { return $this->engine; } /** * {@inheritdoc} */ public function setTheme(FormView $view, $themes) { $this->engine->setTheme($view, $themes); } /** * {@inheritdoc} */ public function renderCsrfToken($tokenId) { if (null === $this->csrfTokenManager) { throw new BadMethodCallException('CSRF tokens can only be generated if a CsrfTokenManagerInterface is injected in FormRenderer::__construct().'); } return $this->csrfTokenManager->getToken($tokenId)->getValue(); } /** * {@inheritdoc} */ public function renderBlock(FormView $view, $blockName, array $variables = array()) { $resource = $this->engine->getResourceForBlockName($view, $blockName); if (!$resource) { throw new LogicException(sprintf('No block "%s" found while rendering the form.', $blockName)); } $viewCacheKey = $view->vars[self::CACHE_KEY_VAR]; // The variables are cached globally for a view (instead of for the // current suffix) if (!isset($this->variableStack[$viewCacheKey])) { $this->variableStack[$viewCacheKey] = array(); // The default variable scope contains all view variables, merged with // the variables passed explicitly to the helper $scopeVariables = $view->vars; $varInit = true; } else { // Reuse the current scope and merge it with the explicitly passed variables $scopeVariables = end($this->variableStack[$viewCacheKey]); $varInit = false; } // Merge the passed with the existing attributes if (isset($variables['attr']) && isset($scopeVariables['attr'])) { $variables['attr'] = array_replace($scopeVariables['attr'], $variables['attr']); } // Merge the passed with the exist *label* attributes if (isset($variables['label_attr']) && isset($scopeVariables['label_attr'])) { $variables['label_attr'] = array_replace($scopeVariables['label_attr'], $variables['label_attr']); } // Do not use array_replace_recursive(), otherwise array variables // cannot be overwritten $variables = array_replace($scopeVariables, $variables); $this->variableStack[$viewCacheKey][] = $variables; // Do the rendering $html = $this->engine->renderBlock($view, $resource, $blockName, $variables); // Clear the stack array_pop($this->variableStack[$viewCacheKey]); if ($varInit) { unset($this->variableStack[$viewCacheKey]); } return $html; } /** * {@inheritdoc} */ public function searchAndRenderBlock(FormView $view, $blockNameSuffix, array $variables = array()) { $renderOnlyOnce = 'row' === $blockNameSuffix || 'widget' === $blockNameSuffix; if ($renderOnlyOnce && $view->isRendered()) { return ''; } // The cache key for storing the variables and types $viewCacheKey = $view->vars[self::CACHE_KEY_VAR]; $viewAndSuffixCacheKey = $viewCacheKey.$blockNameSuffix; // In templates, we have to deal with two kinds of block hierarchies: // // +---------+ +---------+ // | Theme B | -------> | Theme A | // +---------+ +---------+ // // form_widget -------> form_widget // ^ // | // choice_widget -----> choice_widget // // The first kind of hierarchy is the theme hierarchy. This allows to // override the block "choice_widget" from Theme A in the extending // Theme B. This kind of inheritance needs to be supported by the // template engine and, for example, offers "parent()" or similar // functions to fall back from the custom to the parent implementation. // // The second kind of hierarchy is the form type hierarchy. This allows // to implement a custom "choice_widget" block (no matter in which theme), // or to fallback to the block of the parent type, which would be // "form_widget" in this example (again, no matter in which theme). // If the designer wants to explicitly fallback to "form_widget" in his // custom "choice_widget", for example because he only wants to wrap // a <div> around the original implementation, he can simply call the // widget() function again to render the block for the parent type. // // The second kind is implemented in the following blocks. if (!isset($this->blockNameHierarchyMap[$viewAndSuffixCacheKey])) { // INITIAL CALL // Calculate the hierarchy of template blocks and start on // the bottom level of the hierarchy (= "_<id>_<section>" block) $blockNameHierarchy = array(); foreach ($view->vars['block_prefixes'] as $blockNamePrefix) { $blockNameHierarchy[] = $blockNamePrefix.'_'.$blockNameSuffix; } $hierarchyLevel = count($blockNameHierarchy) - 1; $hierarchyInit = true; } else { // RECURSIVE CALL // If a block recursively calls searchAndRenderBlock() again, resume rendering // using the parent type in the hierarchy. $blockNameHierarchy = $this->blockNameHierarchyMap[$viewAndSuffixCacheKey]; $hierarchyLevel = $this->hierarchyLevelMap[$viewAndSuffixCacheKey] - 1; $hierarchyInit = false; } // The variables are cached globally for a view (instead of for the // current suffix) if (!isset($this->variableStack[$viewCacheKey])) { $this->variableStack[$viewCacheKey] = array(); // The default variable scope contains all view variables, merged with // the variables passed explicitly to the helper $scopeVariables = $view->vars; $varInit = true; } else { // Reuse the current scope and merge it with the explicitly passed variables $scopeVariables = end($this->variableStack[$viewCacheKey]); $varInit = false; } // Load the resource where this block can be found $resource = $this->engine->getResourceForBlockNameHierarchy($view, $blockNameHierarchy, $hierarchyLevel); // Update the current hierarchy level to the one at which the resource was // found. For example, if looking for "choice_widget", but only a resource // is found for its parent "form_widget", then the level is updated here // to the parent level. $hierarchyLevel = $this->engine->getResourceHierarchyLevel($view, $blockNameHierarchy, $hierarchyLevel); // The actually existing block name in $resource $blockName = $blockNameHierarchy[$hierarchyLevel]; // Escape if no resource exists for this block if (!$resource) { throw new LogicException(sprintf( 'Unable to render the form as none of the following blocks exist: "%s".', implode('", "', array_reverse($blockNameHierarchy)) )); } // Merge the passed with the existing attributes if (isset($variables['attr']) && isset($scopeVariables['attr'])) { $variables['attr'] = array_replace($scopeVariables['attr'], $variables['attr']); } // Merge the passed with the exist *label* attributes if (isset($variables['label_attr']) && isset($scopeVariables['label_attr'])) { $variables['label_attr'] = array_replace($scopeVariables['label_attr'], $variables['label_attr']); } // Do not use array_replace_recursive(), otherwise array variables // cannot be overwritten $variables = array_replace($scopeVariables, $variables); // In order to make recursive calls possible, we need to store the block hierarchy, // the current level of the hierarchy and the variables so that this method can // resume rendering one level higher of the hierarchy when it is called recursively. // // We need to store these values in maps (associative arrays) because within a // call to widget() another call to widget() can be made, but for a different view // object. These nested calls should not override each other. $this->blockNameHierarchyMap[$viewAndSuffixCacheKey] = $blockNameHierarchy; $this->hierarchyLevelMap[$viewAndSuffixCacheKey] = $hierarchyLevel; // We also need to store the variables for the view so that we can render other // blocks for the same view using the same variables as in the outer block. $this->variableStack[$viewCacheKey][] = $variables; // Do the rendering $html = $this->engine->renderBlock($view, $resource, $blockName, $variables); // Clear the stack array_pop($this->variableStack[$viewCacheKey]); // Clear the caches if they were filled for the first time within // this function call if ($hierarchyInit) { unset($this->blockNameHierarchyMap[$viewAndSuffixCacheKey]); unset($this->hierarchyLevelMap[$viewAndSuffixCacheKey]); } if ($varInit) { unset($this->variableStack[$viewCacheKey]); } if ($renderOnlyOnce) { $view->setRendered(); } return $html; } /** * {@inheritdoc} */ public function humanize($text) { return ucfirst(trim(strtolower(preg_replace(array('/([A-Z])/', '/[_\s]+/'), array('_$1', ' '), $text)))); } } Submit