Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/block/src/Controller/BlockAddController.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\block\Controller\BlockAddController.
+ */
+
+namespace Drupal\block\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Controller for building the block instance add form.
+ */
+class BlockAddController extends ControllerBase {
+
+  /**
+   * Build the block instance add form.
+   *
+   * @param string $plugin_id
+   *   The plugin ID for the block instance.
+   * @param string $theme
+   *   The name of the theme for the block instance.
+   *
+   * @return array
+   *   The block instance edit form.
+   */
+  public function blockAddConfigureForm($plugin_id, $theme) {
+    // Create a block entity.
+    $entity = $this->entityManager()->getStorage('block')->create(array('plugin' => $plugin_id, 'theme' => $theme));
+
+    return $this->entityFormBuilder()->getForm($entity);
+  }
+
+}

core/modules/block/src/Controller/BlockController.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\block\Controller\BlockController.
+ */
+
+namespace Drupal\block\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Extension\ThemeHandler;
+use Drupal\Core\Extension\ThemeHandlerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Controller routines for admin block routes.
+ */
+class BlockController extends ControllerBase {
+
+  /**
+   * The theme handler.
+   *
+   * @var \Drupal\Core\Extension\ThemeHandlerInterface
+   */
+  protected $themeHandler;
+
+  /**
+   * Constructs a new BlockController instance.
+   *
+   * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
+   *   The theme handler.
+   */
+  public function __construct(ThemeHandlerInterface $theme_handler) {
+    $this->themeHandler = $theme_handler;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('theme_handler')
+    );
+  }
+
+  /**
+   * Returns a block theme demo page.
+   *
+   * @param string $theme
+   *   The name of the theme.
+   *
+   * @return array
+   *   A #type 'page' render array containing the block region demo.
+   */
+  public function demo($theme) {
+    $page = [
+      '#title' => $this->themeHandler->getName($theme),
+      '#type' => 'page',
+      '#attached' => array(
+        'drupalSettings' => [
+          // The block demonstration page is not marked as an administrative
+          // page by \Drupal::service('router.admin_context')->isAdminRoute()
+          // function in order to use the frontend theme. Since JavaScript
+          // relies on a proper separation of admin pages, it needs to know this
+          // is an actual administrative page.
+          'path' => ['currentPathIsAdmin' => TRUE],
+        ],
+        'library' => array(
+          'block/drupal.block.admin',
+        ),
+      ),
+    ];
+
+    // Show descriptions in each visible page region, nothing else.
+    $visible_regions = $this->getVisibleRegionNames($theme);
+    foreach (array_keys($visible_regions) as $region) {
+      $page[$region]['block_description'] = array(
+        '#type' => 'inline_template',
+        '#template' => '<div class="block-region demo-block">{{ region_name }}</div>',
+        '#context' => array('region_name' => $visible_regions[$region]),
+      );
+    }
+
+    return $page;
+  }
+
+  /**
+   * Returns the human-readable list of regions keyed by machine name.
+   *
+   * @param string $theme
+   *   The name of the theme.
+   *
+   * @return array
+   *   An array of human-readable region names keyed by machine name.
+   */
+  protected function getVisibleRegionNames($theme) {
+    return system_region_list($theme, REGIONS_VISIBLE);
+  }
+
+}

core/modules/block/src/Controller/BlockListController.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\block\Controller\BlockListController.
+ */
+
+namespace Drupal\block\Controller;
+
+use Drupal\Core\Entity\Controller\EntityListController;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Defines a controller to list blocks.
+ */
+class BlockListController extends EntityListController {
+
+  /**
+   * Shows the block administration page.
+   *
+   * @param string|null $theme
+   *   Theme key of block list.
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
+   *
+   * @return array
+   *   A render array as expected by drupal_render().
+   */
+  public function listing($theme = NULL, Request $request = NULL) {
+    $theme = $theme ?: $this->config('system.theme')->get('default');
+    return $this->entityManager()->getListBuilder('block')->render($theme, $request);
+  }
+
+}

core/modules/block/src/Controller/CategoryAutocompleteController.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\block\Controller\CategoryAutocompleteController.
+ */
+
+namespace Drupal\block\Controller;
+
+use Drupal\Core\Block\BlockManagerInterface;
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Returns autocomplete responses for block categories.
+ */
+class CategoryAutocompleteController implements ContainerInjectionInterface {
+
+  /**
+   * The block manager.
+   *
+   * @var \Drupal\Core\Block\BlockManagerInterface
+   */
+  protected $blockManager;
+
+  /**
+   * Constructs a new CategoryAutocompleteController.
+   *
+   * @param \Drupal\Core\Block\BlockManagerInterface $block_manager
+   *   The block manager.
+   */
+  public function __construct(BlockManagerInterface $block_manager) {
+    $this->blockManager = $block_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('plugin.manager.block')
+    );
+  }
+
+  /**
+   * Retrieves suggestions for block category autocompletion.
+   *
+   * @param \Symfony\Component\HttpFoundation\Request $request
+   *   The current request.
+   *
+   * @return \Symfony\Component\HttpFoundation\JsonResponse
+   *   A JSON response containing autocomplete suggestions.
+   */
+  public function autocomplete(Request $request) {
+    $typed_category = $request->query->get('q');
+    $matches = array();
+    foreach ($this->blockManager->getCategories() as $category) {
+      if (stripos($category, $typed_category) === 0) {
+        $matches[] = array('value' => $category, 'label' => SafeMarkup::checkPlain($category));
+      }
+    }
+    return new JsonResponse($matches);
+  }
+
+}