diff core/lib/Drupal/Core/Render/ElementInfoManager.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Render/ElementInfoManager.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,165 @@
+<?php
+
+namespace Drupal\Core\Render;
+
+use Drupal\Core\Cache\Cache;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Plugin\DefaultPluginManager;
+use Drupal\Core\Render\Element\FormElementInterface;
+use Drupal\Core\Theme\ThemeManagerInterface;
+
+/**
+ * Provides a plugin manager for element plugins.
+ *
+ * @see \Drupal\Core\Render\Annotation\RenderElement
+ * @see \Drupal\Core\Render\Annotation\FormElement
+ * @see \Drupal\Core\Render\Element\RenderElement
+ * @see \Drupal\Core\Render\Element\FormElement
+ * @see \Drupal\Core\Render\Element\ElementInterface
+ * @see \Drupal\Core\Render\Element\FormElementInterface
+ * @see plugin_api
+ */
+class ElementInfoManager extends DefaultPluginManager implements ElementInfoManagerInterface {
+
+  /**
+   * Stores the available element information.
+   *
+   * @var array
+   */
+  protected $elementInfo;
+
+  /**
+   * The theme manager.
+   *
+   * @var \Drupal\Core\Theme\ThemeManagerInterface
+   */
+  protected $themeManager;
+
+  /**
+   * The cache tag invalidator.
+   *
+   * @var \Drupal\Core\Cache\CacheTagsInvalidatorInterface
+   */
+  protected $cacheTagInvalidator;
+
+  /**
+   * Constructs a ElementInfoManager object.
+   *
+   * @param \Traversable $namespaces
+   *   An object that implements \Traversable which contains the root paths
+   *   keyed by the corresponding namespace to look for plugin implementations.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   Cache backend instance to use.
+   * @param \Drupal\Core\Cache\CacheTagsInvalidatorInterface $cache_tag_invalidator
+   *   The cache tag invalidator.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler to invoke the alter hook with.
+   * @param \Drupal\Core\Theme\ThemeManagerInterface $theme_manager
+   *   The theme manager.
+   */
+  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, CacheTagsInvalidatorInterface $cache_tag_invalidator, ModuleHandlerInterface $module_handler, ThemeManagerInterface $theme_manager) {
+    $this->setCacheBackend($cache_backend, 'element_info');
+    $this->themeManager = $theme_manager;
+    $this->cacheTagInvalidator = $cache_tag_invalidator;
+
+    parent::__construct('Element', $namespaces, $module_handler, 'Drupal\Core\Render\Element\ElementInterface', 'Drupal\Core\Render\Annotation\RenderElement');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfo($type) {
+    $theme_name = $this->themeManager->getActiveTheme()->getName();
+    if (!isset($this->elementInfo[$theme_name])) {
+      $this->elementInfo[$theme_name] = $this->buildInfo($theme_name);
+    }
+    $info = isset($this->elementInfo[$theme_name][$type]) ? $this->elementInfo[$theme_name][$type] : [];
+    $info['#defaults_loaded'] = TRUE;
+    return $info;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getInfoProperty($type, $property_name, $default = NULL) {
+    $info = $this->getInfo($type);
+
+    return isset($info[$property_name]) ? $info[$property_name] : $default;
+  }
+
+  /**
+   * Builds up all element information.
+   *
+   * @param string $theme_name
+   *   The theme name.
+   *
+   * @return array
+   */
+  protected function buildInfo($theme_name) {
+    // Get cached definitions.
+    $cid = $this->getCid($theme_name);
+    if ($cache = $this->cacheBackend->get($cid)) {
+      return $cache->data;
+    }
+
+    // Otherwise, rebuild and cache.
+    $info = [];
+    foreach ($this->getDefinitions() as $element_type => $definition) {
+      $element = $this->createInstance($element_type);
+      $element_info = $element->getInfo();
+
+      // If this is element is to be used exclusively in a form, denote that it
+      // will receive input, and assign the value callback.
+      if ($element instanceof FormElementInterface) {
+        $element_info['#input'] = TRUE;
+        $element_info['#value_callback'] = [$definition['class'], 'valueCallback'];
+      }
+      $info[$element_type] = $element_info;
+    }
+
+    foreach ($info as $element_type => $element) {
+      $info[$element_type]['#type'] = $element_type;
+    }
+    // Allow modules to alter the element type defaults.
+    $this->moduleHandler->alter('element_info', $info);
+    $this->themeManager->alter('element_info', $info);
+
+    $this->cacheBackend->set($cid, $info, Cache::PERMANENT, ['element_info_build']);
+
+    return $info;
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * @return \Drupal\Core\Render\Element\ElementInterface
+   */
+  public function createInstance($plugin_id, array $configuration = []) {
+    return parent::createInstance($plugin_id, $configuration);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function clearCachedDefinitions() {
+    $this->elementInfo = NULL;
+    $this->cacheTagInvalidator->invalidateTags(['element_info_build']);
+
+    parent::clearCachedDefinitions();
+  }
+
+  /**
+   * Returns the CID used to cache the element info.
+   *
+   * @param string $theme_name
+   *   The theme name.
+   *
+   * @return string
+   */
+  protected function getCid($theme_name) {
+    return 'element_info_build:' . $theme_name;
+  }
+
+}