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

core/modules/ckeditor/tests/modules/ckeditor_test.info.yml

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+name: CKEditor test
+type: module
+description: Support module for the CKEditor module tests.
+core: 8.x
+package: Testing
+version: VERSION

core/modules/ckeditor/tests/modules/ckeditor_test.module

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+<?php
+
+/**
+ * @file
+ * Helper module for the CKEditor tests.
+ */
+
+use Drupal\editor\Entity\Editor;
+
+/**
+ * Implements hook_ckeditor_css_alter().
+ */
+function ckeditor_test_ckeditor_css_alter(array &$css, Editor $editor) {
+  $css[] = drupal_get_path('module', 'ckeditor_test') . '/ckeditor_test.css';
+}

core/modules/ckeditor/tests/modules/config/schema/ckeditor_test.schema.yml

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+ckeditor.plugin.llama_contextual_and_button:
+  type: mapping
+  label: 'Contextual Llama With Button'
+  mapping:
+    ultra_llama_mode:
+      type: boolean
+      label: 'Ultra llama mode'

core/modules/ckeditor/tests/modules/src/Plugin/CKEditorPlugin/Llama.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\ckeditor_test\Plugin\CKEditorPlugin\Llama.
+ */
+
+namespace Drupal\ckeditor_test\Plugin\CKEditorPlugin;
+
+use Drupal\ckeditor\CKEditorPluginInterface;
+use Drupal\Component\Plugin\PluginBase;
+use Drupal\editor\Entity\Editor;
+
+/**
+ * Defines the "Llama" plugin, with a CKEditor "llama" feature.
+ *
+ * This feature does not correspond to a toolbar button. Because this plugin
+ * does not implement the CKEditorPluginContextualInterface nor the
+ * CKEditorPluginButtonsInterface interface, there is no way of actually loading
+ * this plugin.
+ *
+ * @see MetaContextual
+ * @see MetaButton
+ * @see MetaContextualAndButton
+ *
+ * @CKEditorPlugin(
+ *   id = "llama",
+ *   label = @Translation("Llama")
+ * )
+ */
+class Llama extends PluginBase implements CKEditorPluginInterface {
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::getDependencies().
+   */
+  function getDependencies(Editor $editor) {
+    return array();
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::getLibraries().
+   */
+  function getLibraries(Editor $editor) {
+    return array();
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::isInternal().
+   */
+  function isInternal() {
+    return FALSE;
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::getFile().
+   */
+  function getFile() {
+    return drupal_get_path('module', 'ckeditor_test') . '/js/llama.js';
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::getConfig().
+   */
+  public function getConfig(Editor $editor) {
+    return array();
+  }
+
+}

core/modules/ckeditor/tests/modules/src/Plugin/CKEditorPlugin/LlamaButton.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\ckeditor_test\Plugin\CKEditorPlugin\LlamaButton.
+ */
+
+namespace Drupal\ckeditor_test\Plugin\CKEditorPlugin;
+
+use Drupal\ckeditor\CKEditorPluginButtonsInterface;
+use Drupal\Component\Plugin\PluginBase;
+
+/**
+ * Defines a "LlamaButton" plugin, with a toolbar builder-enabled "llama" feature.
+ *
+ * @CKEditorPlugin(
+ *   id = "llama_button",
+ *   label = @Translation("Llama Button")
+ * )
+ */
+class LlamaButton extends Llama implements CKEditorPluginButtonsInterface {
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginButtonsInterface::getButtons().
+   */
+  function getButtons() {
+    return array(
+      'Llama' => array(
+        'label' => t('Insert Llama'),
+      ),
+    );
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::getFile().
+   */
+  function getFile() {
+    return drupal_get_path('module', 'ckeditor_test') . '/js/llama_button.js';
+  }
+
+}

core/modules/ckeditor/tests/modules/src/Plugin/CKEditorPlugin/LlamaContextual.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\ckeditor_test\Plugin\CKEditorPlugin\LlamaContextual.
+ */
+
+namespace Drupal\ckeditor_test\Plugin\CKEditorPlugin;
+
+use Drupal\ckeditor\CKEditorPluginContextualInterface;
+use Drupal\Component\Plugin\PluginBase;
+use Drupal\editor\Entity\Editor;
+
+/**
+ * Defines a "Llama" plugin, with a contextually enabled "llama" feature.
+ *
+ * @CKEditorPlugin(
+ *   id = "llama_contextual",
+ *   label = @Translation("Contextual Llama")
+ * )
+ */
+class LlamaContextual extends Llama implements CKEditorPluginContextualInterface {
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginContextualInterface::isEnabled().
+   */
+  function isEnabled(Editor $editor) {
+    // Automatically enable this plugin if the Underline button is enabled.
+    $settings = $editor->getSettings();
+    foreach ($settings['toolbar']['rows'] as $row) {
+      foreach ($row as $group) {
+        if (in_array('Strike', $group['items'])) {
+          return TRUE;
+        }
+      }
+    }
+    return FALSE;
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::getFile().
+   */
+  function getFile() {
+    return drupal_get_path('module', 'ckeditor_test') . '/js/llama_contextual.js';
+  }
+
+}

core/modules/ckeditor/tests/modules/src/Plugin/CKEditorPlugin/LlamaContextualAndButton.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\ckeditor_test\Plugin\CKEditorPlugin\LlamaContextualAndButton.
+ */
+
+namespace Drupal\ckeditor_test\Plugin\CKEditorPlugin;
+
+use Drupal\ckeditor\CKEditorPluginButtonsInterface;
+use Drupal\ckeditor\CKEditorPluginContextualInterface;
+use Drupal\ckeditor\CKEditorPluginConfigurableInterface;
+use Drupal\Component\Plugin\PluginBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\editor\Entity\Editor;
+
+/**
+ * Defines a "LlamaContextualAndbutton" plugin, with a contextually OR toolbar
+ * builder-enabled "llama" feature.
+ *
+ * @CKEditorPlugin(
+ *   id = "llama_contextual_and_button",
+ *   label = @Translation("Contextual Llama With Button")
+ * )
+ */
+class LlamaContextualAndButton extends Llama implements CKEditorPluginContextualInterface, CKEditorPluginButtonsInterface, CKEditorPluginConfigurableInterface {
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginContextualInterface::isEnabled().
+   */
+  function isEnabled(Editor $editor) {
+    // Automatically enable this plugin if the Strike button is enabled.
+    $settings = $editor->getSettings();
+    foreach ($settings['toolbar']['rows'] as $row) {
+      foreach ($row as $group) {
+        if (in_array('Strike', $group['items'])) {
+          return TRUE;
+        }
+      }
+    }
+    return FALSE;
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginButtonsInterface::getButtons().
+   */
+  function getButtons() {
+    return array(
+      'Llama' => array(
+        'label' => t('Insert Llama'),
+      ),
+    );
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginInterface::getFile().
+   */
+  function getFile() {
+    return drupal_get_path('module', 'ckeditor_test') . '/js/llama_contextual_and_button.js';
+  }
+
+  /**
+   * Implements \Drupal\ckeditor\Plugin\CKEditorPluginConfigurableInterface::settingsForm().
+   */
+  function settingsForm(array $form, FormStateInterface $form_state, Editor $editor) {
+    // Defaults.
+    $config = array('ultra_llama_mode' => FALSE);
+    $settings = $editor->getSettings();
+    if (isset($settings['plugins']['llama_contextual_and_button'])) {
+      $config = $settings['plugins']['llama_contextual_and_button'];
+    }
+
+    $form['ultra_llama_mode'] = array(
+      '#title' => t('Ultra llama mode'),
+      '#type' => 'checkbox',
+      '#default_value' => $config['ultra_llama_mode'],
+    );
+
+    return $form;
+  }
+
+}