287 lines
10 KiB
PHP
287 lines
10 KiB
PHP
<?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\Component\Form;
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use Symfony\Component\Form\Extension\Core\View\ChoiceView;
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use Symfony\Component\Form\Exception\FormException;
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use Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface;
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/**
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* Renders a form into HTML using a rendering engine.
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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class FormRenderer implements FormRendererInterface
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{
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const CACHE_KEY_VAR = 'unique_block_prefix';
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/**
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* @var FormRendererEngineInterface
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*/
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private $engine;
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/**
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* @var CsrfProviderInterface
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*/
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private $csrfProvider;
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/**
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* @var array
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*/
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private $blockNameHierarchyMap = array();
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/**
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* @var array
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*/
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private $hierarchyLevelMap = array();
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/**
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* @var array
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*/
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private $variableStack = array();
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public function __construct(FormRendererEngineInterface $engine, CsrfProviderInterface $csrfProvider = null)
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{
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$this->engine = $engine;
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$this->csrfProvider = $csrfProvider;
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}
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/**
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* {@inheritdoc}
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*/
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public function getEngine()
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{
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return $this->engine;
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}
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/**
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* {@inheritdoc}
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*/
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public function setTheme(FormView $view, $themes)
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{
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$this->engine->setTheme($view, $themes);
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}
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/**
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* {@inheritdoc}
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*/
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public function renderCsrfToken($intention)
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{
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if (null === $this->csrfProvider) {
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throw new \BadMethodCallException('CSRF token can only be generated if a CsrfProviderInterface is injected in the constructor.');
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}
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return $this->csrfProvider->generateCsrfToken($intention);
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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, $blockName, array $variables = array())
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{
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if (0 == count($this->variableStack)) {
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throw new FormException('This method should only be called while rendering a form element.');
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}
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$viewCacheKey = $view->vars[self::CACHE_KEY_VAR];
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$scopeVariables = end($this->variableStack[$viewCacheKey]);
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$resource = $this->engine->getResourceForBlockName($view, $blockName);
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if (!$resource) {
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throw new FormException(sprintf('No block "%s" found while rendering the form.', $blockName));
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}
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// Merge the passed with the existing attributes
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if (isset($variables['attr']) && isset($scopeVariables['attr'])) {
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$variables['attr'] = array_replace($scopeVariables['attr'], $variables['attr']);
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}
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// Merge the passed with the exist *label* attributes
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if (isset($variables['label_attr']) && isset($scopeVariables['label_attr'])) {
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$variables['label_attr'] = array_replace($scopeVariables['label_attr'], $variables['label_attr']);
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}
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// Do not use array_replace_recursive(), otherwise array variables
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// cannot be overwritten
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$variables = array_replace($scopeVariables, $variables);
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$this->variableStack[$viewCacheKey][] = $variables;
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// Do the rendering
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$html = $this->engine->renderBlock($view, $resource, $blockName, $variables);
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// Clear the stack
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array_pop($this->variableStack[$viewCacheKey]);
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return $html;
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}
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/**
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* {@inheritdoc}
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*/
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public function searchAndRenderBlock(FormView $view, $blockNameSuffix, array $variables = array())
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{
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$renderOnlyOnce = 'row' === $blockNameSuffix || 'widget' === $blockNameSuffix;
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if ($renderOnlyOnce && $view->isRendered()) {
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return '';
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}
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// The cache key for storing the variables and types
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$viewCacheKey = $view->vars[self::CACHE_KEY_VAR];
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$viewAndSuffixCacheKey = $viewCacheKey . $blockNameSuffix;
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// In templates, we have to deal with two kinds of block hierarchies:
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//
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// +---------+ +---------+
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// | Theme B | -------> | Theme A |
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// +---------+ +---------+
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//
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// form_widget -------> form_widget
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// ^
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// |
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// choice_widget -----> choice_widget
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//
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// The first kind of hierarchy is the theme hierarchy. This allows to
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// override the block "choice_widget" from Theme A in the extending
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// Theme B. This kind of inheritance needs to be supported by the
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// template engine and, for example, offers "parent()" or similar
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// functions to fall back from the custom to the parent implementation.
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//
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// The second kind of hierarchy is the form type hierarchy. This allows
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// to implement a custom "choice_widget" block (no matter in which theme),
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// or to fallback to the block of the parent type, which would be
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// "form_widget" in this example (again, no matter in which theme).
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// If the designer wants to explicitly fallback to "form_widget" in his
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// custom "choice_widget", for example because he only wants to wrap
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// a <div> around the original implementation, he can simply call the
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// widget() function again to render the block for the parent type.
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//
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// The second kind is implemented in the following blocks.
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if (!isset($this->blockNameHierarchyMap[$viewAndSuffixCacheKey])) {
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// INITIAL CALL
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// Calculate the hierarchy of template blocks and start on
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// the bottom level of the hierarchy (= "_<id>_<section>" block)
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$blockNameHierarchy = array();
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foreach ($view->vars['block_prefixes'] as $blockNamePrefix) {
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$blockNameHierarchy[] = $blockNamePrefix . '_' . $blockNameSuffix;
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}
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$hierarchyLevel = count($blockNameHierarchy) - 1;
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$hierarchyInit = true;
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} else {
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// RECURSIVE CALL
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// If a block recursively calls searchAndRenderBlock() again, resume rendering
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// using the parent type in the hierarchy.
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$blockNameHierarchy = $this->blockNameHierarchyMap[$viewAndSuffixCacheKey];
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$hierarchyLevel = $this->hierarchyLevelMap[$viewAndSuffixCacheKey] - 1;
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$hierarchyInit = false;
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}
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// The variables are cached globally for a view (instead of for the
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// current suffix)
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if (!isset($this->variableStack[$viewCacheKey])) {
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// The default variable scope contains all view variables, merged with
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// the variables passed explicitly to the helper
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$scopeVariables = $view->vars;
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$varInit = true;
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} else {
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// Reuse the current scope and merge it with the explicitly passed variables
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$scopeVariables = end($this->variableStack[$viewCacheKey]);
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$varInit = false;
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}
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// Load the resource where this block can be found
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$resource = $this->engine->getResourceForBlockNameHierarchy($view, $blockNameHierarchy, $hierarchyLevel);
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// Update the current hierarchy level to the one at which the resource was
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// found. For example, if looking for "choice_widget", but only a resource
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// is found for its parent "form_widget", then the level is updated here
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// to the parent level.
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$hierarchyLevel = $this->engine->getResourceHierarchyLevel($view, $blockNameHierarchy, $hierarchyLevel);
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// The actually existing block name in $resource
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$blockName = $blockNameHierarchy[$hierarchyLevel];
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// Escape if no resource exists for this block
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if (!$resource) {
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throw new FormException(sprintf(
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'Unable to render the form as none of the following blocks exist: "%s".',
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implode('", "', array_reverse($blockNameHierarchy))
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));
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}
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// Merge the passed with the existing attributes
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if (isset($variables['attr']) && isset($scopeVariables['attr'])) {
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$variables['attr'] = array_replace($scopeVariables['attr'], $variables['attr']);
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}
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// Merge the passed with the exist *label* attributes
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if (isset($variables['label_attr']) && isset($scopeVariables['label_attr'])) {
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$variables['label_attr'] = array_replace($scopeVariables['label_attr'], $variables['label_attr']);
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}
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// Do not use array_replace_recursive(), otherwise array variables
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// cannot be overwritten
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$variables = array_replace($scopeVariables, $variables);
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// In order to make recursive calls possible, we need to store the block hierarchy,
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// the current level of the hierarchy and the variables so that this method can
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// resume rendering one level higher of the hierarchy when it is called recursively.
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//
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// We need to store these values in maps (associative arrays) because within a
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// call to widget() another call to widget() can be made, but for a different view
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// object. These nested calls should not override each other.
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$this->blockNameHierarchyMap[$viewAndSuffixCacheKey] = $blockNameHierarchy;
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$this->hierarchyLevelMap[$viewAndSuffixCacheKey] = $hierarchyLevel;
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// We also need to store the variables for the view so that we can render other
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// blocks for the same view using the same variables as in the outer block.
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$this->variableStack[$viewCacheKey][] = $variables;
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// Do the rendering
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$html = $this->engine->renderBlock($view, $resource, $blockName, $variables);
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// Clear the stack
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array_pop($this->variableStack[$viewCacheKey]);
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// Clear the caches if they were filled for the first time within
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// this function call
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if ($hierarchyInit) {
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unset($this->blockNameHierarchyMap[$viewAndSuffixCacheKey]);
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unset($this->hierarchyLevelMap[$viewAndSuffixCacheKey]);
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}
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if ($varInit) {
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unset($this->variableStack[$viewCacheKey]);
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}
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if ($renderOnlyOnce) {
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$view->setRendered();
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}
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return $html;
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}
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/**
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* {@inheritdoc}
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*/
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public function humanize($text)
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{
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return ucfirst(trim(strtolower(preg_replace('/[_\s]+/', ' ', $text))));
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}
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}
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