Issue #1890502 by Wim Leers, quicksketch, jessebeach, nod_, sun, effulgentsia:...

Issue #1890502 by Wim Leers, quicksketch, jessebeach, nod_, sun, effulgentsia: Added CKEditor module to core.

core/modules/ckeditor/ckeditor.admin.inc

+<?php
+
+/**
+ * @file
+ * Callbacks and theming for the CKEditor toolbar configuration UI.
+ */
+
+use Drupal\Core\Template\Attribute;
+
+/**
+ * Preprocess variables for theme_ckeditor_settings_toolbar().
+ */
+function template_preprocess_ckeditor_settings_toolbar(&$variables) {
+  // Simplify the language direction information for toolbar buttons.
+  $language_interface = language(LANGUAGE_TYPE_INTERFACE);
+  $variables['language_direction'] = $language_interface->direction ? 'rtl' : 'ltr';
+
+  // Create lists of active and disabled buttons.
+  $editor = $variables['editor'];
+  $plugins = $variables['plugins'];
+  $buttons = array();
+  $variables['multiple_buttons'] = array();
+  foreach ($plugins as $plugin => $plugin_buttons) {
+    foreach ($plugin_buttons as $button_name => $button) {
+      $button['name'] = $button_name;
+      if (!empty($button['multiple'])) {
+        $variables['multiple_buttons'][$button_name] = $button;
+      }
+      $buttons[$button_name] = $button;
+    }
+  }
+  $variables['active_buttons'] = array();
+  foreach ($editor->settings['toolbar']['buttons'] as $row_number => $row) {
+    foreach ($row as $button_name) {
+      if (isset($buttons[$button_name])) {
+        $variables['active_buttons'][$row_number][] = $buttons[$button_name];
+        if (empty($buttons[$button_name]['multiple'])) {
+          unset($buttons[$button_name]);
+        }
+      }
+    }
+  }
+  $variables['disabled_buttons'] = array_diff_key($buttons, $variables['multiple_buttons']);
+}
+
+/**
+ * Displays the toolbar configuration for CKEditor.
+ */
+function theme_ckeditor_settings_toolbar($variables) {
+  $editor = $variables['editor'];
+  $plugins = $variables['plugins'];
+  $rtl = $variables['language_direction'] === 'rtl' ? '_rtl' : '';
+
+  $build_button_item = function($button, $rtl) {
+    // Value of the button item.
+    if (isset($button['image_alternative'])) {
+      $value = $button['image_alternative' . $rtl];
+    }
+    elseif (isset($button['image'])) {
+      $value = theme('image', array('uri' => $button['image' . $rtl], 'title' => $button['label']));
+    }
+    else {
+      $value = '?';
+    }
+
+    // Set additional attribute on the button if it can occur multiple times.
+    if (!empty($button['multiple'])) {
+     $button['attributes']['class'][] = 'ckeditor-multiple-button';
+    }
+
+    // Build the button item.
+    $button_item = array(
+      'value' => $value,
+      'data-button-name' => $button['name'],
+    );
+    if (!empty($button['attributes'])) {
+      $button_item = array_merge($button_item, $button['attributes']);
+    }
+
+    return $button_item;
+  };
+
+  // Assemble items to be added to active button rows.
+  $active_buttons = array();
+  foreach ($variables['active_buttons'] as $row_number => $row_buttons) {
+    foreach ($row_buttons as $button) {
+      $active_buttons[$row_number][] = $build_button_item($button, $rtl);
+    }
+  }
+  // Assemble list of disabled buttons (which are always a single row).
+  $disabled_buttons = array();
+  foreach ($variables['disabled_buttons'] as $button) {
+    $disabled_buttons[] = $build_button_item($button, $rtl);
+  }
+  // Assemble list of multiple buttons that may be added multiple times.
+  $multiple_buttons = array();
+  foreach ($variables['multiple_buttons'] as $button_name => $button) {
+    $multiple_buttons[] = $build_button_item($button, $rtl);
+  }
+
+  $print_buttons = function($buttons) {
+    $output = '';
+    foreach ($buttons as $button) {
+      $value = $button['value'];
+      unset($button['value']);
+      $attributes = (string) new Attribute($button);
+      $output .= '<li' . $attributes . '>' . $value . '</li>';
+    }
+    return $output;
+  };
+
+  // We don't use theme_item_list() below in case there are no buttons in the
+  // active or disabled list, as theme_item_list() will not print an empty UL.
+  $output = '';
+  $output .= '<fieldset role="form" aria-labelledby="ckeditor-button-configuration ckeditor-button-description">';
+  $output .= '<legend id="ckeditor-button-configuration">' . t('Toolbar configuration') . '</legend>';
+  $output .= '<div class="fieldset-wrapper">';
+
+  // aria-live region for outputing aural information about the state of the
+  // configuration.
+  $output .= '<div id="ckeditor-button-configuration-aria-live" class="element-invisible" aria-live="polite"></div>';
+
+  $output .= '<div id="ckeditor-button-description" class="fieldset-description">' . t('Move a button into the <em>Active toolbar</em> to enable it, or into the list of <em>Available buttons</em> to disable it. Use dividers to create button groups. Buttons may be moved with the mouse or keyboard arrow keys.') . '</div>';
+
+  $output .= '<div class="ckeditor-toolbar-disabled clearfix">';
+  $output .= '<div class="ckeditor-toolbar-dividers">';
+  $output .= '<label id="ckeditor-multiple-label">' . t('Dividers') . '</label>';
+  $output .= '<ul class="ckeditor-multiple-buttons" role="form" aria-labelledby="ckeditor-multiple-label">';
+  $output .= $print_buttons($multiple_buttons);
+  $output .= '</ul>';
+  $output .= '</div>';
+  $output .= '<label id="ckeditor-available-buttons">' . t('Available buttons') . '</label>';
+  $output .= '<ul class="ckeditor-buttons" role="form" aria-labelledby="ckeditor-available-buttons">';
+  $output .= $print_buttons($disabled_buttons);
+  $output .= '</ul>';
+  $output .= '</div>';
+
+  $output .= '<label id="ckeditor-active-toolbar">' . t('Active toolbar') . '</label>';
+
+  $output .= '<div data-toolbar="active" class="ckeditor-toolbar-active clearfix">';
+  foreach ($active_buttons as $button_row) {
+    $output .= '<ul class="ckeditor-buttons" role="form" aria-labelledby="ckeditor-active-toolbar">';
+    $output .= $print_buttons($button_row);
+    $output .= '</ul>';
+  }
+  if (empty($active_buttons)) {
+    $output .= '<ul class="ckeditor-buttons">';
+    $output .= '</ul>';
+  }
+
+  $output .= '<div class="ckeditor-row-controls">';
+  $output .= '<a href="#" role="button" aria-label="' . t('Remove last button row') . '" class="ckeditor-row-remove" title="' . t('Remove row') . '">-</a>';
+  $output .= '<a href="#" role="button" aria-label="' . t('Add additional button row') . '" class="ckeditor-row-add" title="' . t('Add row') . '">+</a>';
+  $output .= '</div>';
+
+  $output .= '</div>';
+
+  $output .= '</div>';
+  $output .= '</fieldset>';
+
+  return $output;
+}

core/modules/ckeditor/ckeditor.api.php

+<?php
+
+/**
+ * @file
+ * Documentation for CKEditor module APIs.
+ */
+
+use Drupal\editor\Plugin\Core\Entity\Editor;
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * Modify the list of available CKEditor plugins.
+ *
+ * This hook may be used to modify plugin properties after they have been
+ * specified by other modules.
+ *
+ * @param $plugins
+ *   An array of all the existing plugin definitions, passed by reference.
+ *
+ * @see CKEditorPluginManager
+ */
+function hook_ckeditor_plugin_info_alter(array &$plugins) {
+  $plugins['someplugin']['label'] = t('Better name');
+}
+
+/**
+ * Modify the list of CSS files that will be added to a CKEditor instance.
+ *
+ * Modules may use this hook to provide their own custom CSS file without
+ * providing a CKEditor plugin. This list of CSS files is only used in the
+ * iframe versions of CKEditor.
+ *
+ * Front-end themes (and base themes) can easily specify CSS files to be used in
+ * iframe instances of CKEditor through an entry in their .info file:
+ *
+ * @code
+ * ckeditor_stylesheets[] = css/ckeditor-iframe.css
+ * @endcode
+ *
+ * @param array &$css
+ *   An array of CSS files, passed by reference. This is a flat list of file
+ *   paths relative to the Drupal root.
+ * @param $editor
+ *   The text editor object as returned by editor_load(), for which these files
+ *   are being loaded. Based on this information, it is possible to load the
+ *   corresponding text format object as returned by filter_format_load().
+ *
+ * @see _ckeditor_theme_css()
+ */
+function hook_ckeditor_css_alter(array &$css, Editor $editor) {
+  $css[] = drupal_get_path('module', 'mymodule') . '/css/mymodule-ckeditor.css';
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */

core/modules/ckeditor/ckeditor.info

+name = CKEditor
+description = WYSIWYG editing for rich text fields using CKEditor.
+package = Core
+core = 8.x
+version = VERSION
+dependencies[] = editor

core/modules/ckeditor/ckeditor.module

+<?php
+
+/**
+ * @file
+ * Provides integration with the CKEditor WYSIWYG editor.
+ */
+
+/**
+ * Implements hook_library_info().
+ */
+function ckeditor_library_info() {
+  $module_path = drupal_get_path('module', 'ckeditor');
+
+  $settings = array(
+    'ckeditor' => array(
+      'modulePath' => drupal_get_path('module', 'ckeditor'),
+    ),
+  );
+  $libraries['drupal.ckeditor'] = array(
+    'title' => 'Drupal behavior to enable CKEditor on textareas.',
+    'version' => VERSION,
+    'js' => array(
+      $module_path . '/js/ckeditor.js' => array(),
+      array('data' => $settings, 'type' => 'setting'),
+    ),
+    'dependencies' => array(
+      array('system', 'drupal'),
+      array('ckeditor', 'ckeditor'),
+      array('editor', 'drupal.editor'),
+    ),
+  );
+  $libraries['drupal.ckeditor.admin'] = array(
+    'title' => 'Drupal behavior for drag-and-drop CKEditor toolbar builder UI.',
+    'version' => VERSION,
+    'js' => array(
+      $module_path . '/js/ckeditor.admin.js' => array(),
+    ),
+    'css' => array(
+      $module_path . '/css/ckeditor.admin.css' => array(),
+      'core/misc/ckeditor/skins/moono/editor.css' => array(),
+    ),
+    'dependencies' => array(
+      array('system', 'jquery'),
+      array('system', 'drupal'),
+      array('system', 'drupalSettings'),
+      array('system', 'jquery.once'),
+      array('system', 'jquery.ui.sortable'),
+      array('system', 'jquery.ui.draggable'),
+    ),
+  );
+  $libraries['drupal.ckeditor.stylescombo.admin'] = array(
+    'title' => 'Only show the "stylescombo" plugin settings when its button is enabled.',
+    'version' => VERSION,
+    'js' => array(
+      $module_path . '/js/ckeditor.stylescombo.admin.js' => array(),
+    ),
+    'dependencies' => array(
+      array('system', 'jquery'),
+      array('system', 'drupal'),
+      array('system', 'jquery.once'),
+      array('system', 'drupal.vertical-tabs'),
+    ),
+  );
+  $libraries['ckeditor'] = array(
+    'title' => 'Loads the main CKEditor library.',
+    'version' => '4.0.1',
+    'js' => array(
+      'core/misc/ckeditor/ckeditor.js' => array(),
+    ),
+  );
+
+  return $libraries;
+}
+
+/**
+ * Implements hook_theme().
+ */
+function ckeditor_theme() {
+  return array(
+    'ckeditor_settings_toolbar' => array(
+      'file' => 'ckeditor.admin.inc',
+      'variables' => array('editor' => NULL, 'plugins' => NULL),
+    ),
+  );
+}
+
+/**
+ * Retrieves the default theme's CKEditor stylesheets defined in the .info file.
+ *
+ * Themes may specify iframe-specific CSS files for use with CKEditor by
+ * including a "ckeditor_stylesheets" key in the theme .info file.
+ *
+ * @code
+ * ckeditor_stylesheets[] = css/ckeditor-iframe.css
+ * @endcode
+ */
+function _ckeditor_theme_css($theme = NULL) {
+  $css = array();
+  if (!isset($theme)) {
+    $theme = variable_get('theme_default');
+  }
+  if ($theme_path = drupal_get_path('theme', $theme)) {
+    $info = system_get_info('theme', $theme);
+    if (isset($info['ckeditor_stylesheets'])) {
+      $css = $info['ckeditor_stylesheets'];
+      foreach ($css as $key => $path) {
+        $css[$key] = $theme_path . '/' . $path;
+      }
+    }
+    if (isset($info['base theme'])) {
+      $css = array_merge(_ckeditor_theme_css($info['base theme'], $css));
+    }
+  }
+  return $css;
+}

core/modules/ckeditor/css/ckeditor-iframe.css

+/**
+ * CSS added to iframe-based instances only.
+ */
+body {
+  font-family: Arial, Verdana, sans-serif;
+  font-size: 12px;
+  color: #222;
+  background-color: #fff;
+  margin: 8px;
+}
+
+ol, ul, dl {
+  /* IE7: reset rtl list margin. (CKEditor issue #7334) */
+  *margin-right: 0px;
+  /* Preserved spaces for list items with text direction other than the list.
+   * (CKEditor issues #6249,#8049) */
+  padding: 0 40px;
+}

core/modules/ckeditor/css/ckeditor.admin-rtl.css

+/**
+ * @file
+ * Styles for configuration of CKEditor module for right-to-left languages.
+ */
+
+.ckeditor-toolbar-active > ul {
+  clear: right;
+  float: right;
+}
+
+ul.ckeditor-buttons li {
+  float: right;
+}
+
+ul.ckeditor-buttons li:first-child a {
+  border-top-right-radius: 2px;
+  border-bottom-right-radius: 2px;
+}
+ul.ckeditor-buttons li:last-child a {
+  border-top-left-radius: 2px;
+  border-bottom-left-radius: 2px;
+}
+ul.ckeditor-multiple-buttons {
+  float: right;
+}
+ul.ckeditor-multiple-buttons li {
+  float: right;
+}
+
+.ckeditor-row-controls {
+  float: left;
+  text-align: left;
+}

core/modules/ckeditor/css/ckeditor.admin.css

+/**
+ * @file
+ * Styles for configuration of CKEditor module.
+ *
+ * Many of these styles are adapted directly from the default CKEditor theme
+ * "moono".
+ */
+
+.ckeditor-toolbar-active {
+  border: 1px solid #b6b6b6;
+  padding: 6px 8px 2px;
+  box-shadow: 0 1px 0 white inset;
+  background: #cfd1cf;
+  background-image: -webkit-gradient(linear, left top, left bottom, from(whiteSmoke), to(#cfd1cf));
+  background-image: -moz-linear-gradient(top, whiteSmoke, #cfd1cf);
+  background-image: -o-linear-gradient(top, whiteSmoke, #cfd1cf);
+  background-image: -ms-linear-gradient(top, whiteSmoke, #cfd1cf);
+  background-image: linear-gradient(top, whiteSmoke, #cfd1cf);
+  filter: progid:DXImageTransform.Microsoft.gradient(gradientType=0, startColorstr='#fff5f5f5', endColorstr='#ffcfd1cf');
+  margin: 5px 0;
+  overflow: nowrap;
+}
+.ckeditor-toolbar-active > ul {
+  clear: left; /* LTR */
+  float: left; /* LTR */
+}
+#ckeditor-button-description {
+  margin-bottom: 1em;
+}
+.ckeditor-toolbar-dividers {
+  float: right;
+}
+.ckeditor-toolbar-disabled ul.ckeditor-buttons {
+  border: 0;
+}
+.ckeditor-toolbar-disabled ul.ckeditor-buttons li {
+  margin: 2px;
+}
+.ckeditor-toolbar-disabled ul.ckeditor-buttons li a,
+ul.ckeditor-buttons {
+  border: 1px solid #a6a6a6;
+  border-bottom-color: #979797;
+  border-radius: 3px;
+  box-shadow: 0 1px 0 rgba(255, 255, 255, .5), 0 0 2px rgba(255, 255, 255, .15) inset, 0 1px 0 rgba(255, 255, 255, .15) inset;
+}
+
+ul.ckeditor-buttons {
+  min-height: 26px;
+  min-width: 26px;
+  list-style: none;
+  padding: 0;
+  margin: 0 6px 5px 0;
+  border: 1px solid #a6a6a6;
+  border-bottom-color: #979797;
+  border-radius: 3px;
+  box-shadow: 0 1px 0 rgba(255, 255, 255, .5), 0 0 2px rgba(255, 255, 255, .15) inset, 0 1px 0 rgba(255, 255, 255, .15) inset;
+}
+ul.ckeditor-buttons li {
+  display: inline-block;
+  padding: 0;
+  margin: 0;
+  float: left; /* LTR */
+}
+ul.ckeditor-buttons li a {
+  position: relative;
+  display: block;
+  height: 18px;
+  padding: 4px 6px;
+  cursor: move;
+  border: 0;
+  white-space: nowrap;
+  text-decoration: none;
+  text-shadow: 0 1px 0 rgba(255,255,255,.5);
+  color: #474747;
+  background: #e4e4e4;
+  background-image: -webkit-gradient(linear,left top,left bottom,from(white),to(#e4e4e4));
+  background-image: -moz-linear-gradient(top,white,#e4e4e4);
+  background-image: -webkit-linear-gradient(top,white,#e4e4e4);
+  background-image: -o-linear-gradient(top,white,#e4e4e4);
+  background-image: -ms-linear-gradient(top,white,#e4e4e4);
+  background-image: linear-gradient(top,white,#e4e4e4);
+  filter: progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr='#ffffffff',endColorstr='#ffe4e4e4');
+}
+ul.ckeditor-buttons li .cke-icon-only {
+  text-indent: -9999px;
+  width: 16px;
+}
+ul.ckeditor-buttons li a:focus {
+  z-index: 11; /* Ensure focused buttons show their outline on all sides. */
+}
+ul.ckeditor-buttons li:first-child a {
+  border-top-left-radius: 2px; /* LTR */
+  border-bottom-left-radius: 2px; /* LTR */
+}
+ul.ckeditor-buttons li:last-child a {
+  border-top-right-radius: 2px; /* LTR */
+  border-bottom-right-radius: 2px; /* LTR */
+}
+ul.ckeditor-buttons li.ckeditor-button-placeholder a {
+  background: #333;
+  opacity: 0.3;
+}
+ul.ckeditor-multiple-buttons {
+  padding: 1px 2px;
+  margin: 5px;
+  list-style: none;
+  float: left; /* LTR */
+}
+ul.ckeditor-multiple-buttons li {
+  display: inline-block;
+  float: left; /* LTR */
+  margin: 0;
+  padding: 0;
+}
+ul.ckeditor-multiple-buttons li a {
+  cursor: move;
+  display: inline-block;
+  height: 18px;
+  margin: 0;
+  padding: 2px 0;
+}
+ul.ckeditor-buttons li.ckeditor-group-button-separator,
+ul.ckeditor-multiple-buttons li.ckeditor-group-button-separator {
+  margin: -1px -3px -2px;
+}
+ul.ckeditor-buttons li.ckeditor-group-button-separator a,
+ul.ckeditor-multiple-buttons li.ckeditor-group-button-separator a {
+  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAAdCAMAAABG4xbVAAAAhFBMVEUAAACmpqampqampqb////l5eX////5+fmmpqatra2urq6vr6+1tbW2tra4uLi6urq8vLzb29ve3t7i4uLl5eXn5+fo6Ojp6enq6urr6+vs7Ozt7e3u7u7v7+/w8PDx8fHy8vLz8/P09PT19fX29vb39/f4+Pj5+fn6+vr7+/v8/Pz+/v7qIQO+AAAACHRSTlMATVmAi8XM29MuWToAAABjSURBVBiVrc5BCoAwDETRMKhtRBduev9LKm1xjItWRBBE6Nt9QkIwOTcUzk0Imi8aoMssxbgoTHMtqsFMLta0vPh2N49HyfdelPg6k9uvX/a+Bmggt1qJRNzQFVgjEnkUZDoBmH57VSypjg4AAAAASUVORK5CYII=) no-repeat center center;
+  width: 13px;
+  padding: 0;
+  height: 29px;
+  position: relative;
+  z-index: 10;
+}
+ul.ckeditor-buttons li.ckeditor-button-separator a {
+  background: #e4e4e4;
+  background-image: -webkit-linear-gradient(#e4e4e4, #b4b4b4);
+  background-image: linear-gradient(#e4e4e4, #b4b4b4);
+  height: 24px;
+  margin: 1px 0 0;
+  padding: 0;
+  position: relative;
+  width: 1px;
+  z-index: 10;
+}
+ul.ckeditor-multiple-buttons li.ckeditor-button-separator a {
+  width: 2px;
+  padding: 0;
+  height: 26px;
+  margin: 0 10px;
+}
+.ckeditor-separator {
+  background-color: silver;
+  background-color: rgba(0, 0, 0, .2);
+  margin: 5px 0;
+  height: 18px;
+  width: 1px;
+  display: block;
+  -webkit-box-shadow: 1px 0 1px rgba(255, 255, 255, .5);
+  -moz-box-shadow: 1px 0 1px rgba(255,255,255,.5);
+  box-shadow: 1px 0 1px rgba(255, 255, 255, .5)
+}
+.ckeditor-button-arrow {
+  width: 0;
+  text-align: center;
+  border-left: 3px solid transparent;
+  border-right: 3px solid transparent;
+  border-top: 3px solid #333;
+  display: inline-block;
+  margin: 0 4px 2px;
+}
+
+.ckeditor-row-controls {
+  float: right; /* LTR */
+  font-size: 18px;
+  width: 40px;
+  text-align: right; /* LTR */
+}
+.ckeditor-row-controls a {
+  display: inline-block;
+  padding: 6px 2px;
+  height: 16px;
+  width: 16px;
+  line-height: 0.9;
+  font-weight: bold;
+  color: #333;
+  text-decoration: none;
+}

core/modules/ckeditor/js/ckeditor.js

+(function (Drupal, CKEDITOR) {
+
+"use strict";
+
+Drupal.editors.ckeditor = {
+
+  attach: function (element, format) {
+    var externalPlugins = format.editorSettings.externalPlugins;
+    // Register and load additional CKEditor plugins as necessary.
+    if (externalPlugins) {
+      for (var pluginName in externalPlugins) {
+        if (externalPlugins.hasOwnProperty(pluginName)) {
+          CKEDITOR.plugins.addExternal(pluginName, externalPlugins[pluginName], '');
+        }
+      }
+      delete format.editorSettings.drupalExternalPlugins;
+    }
+    return !!CKEDITOR.replace(element, format.editorSettings);
+  },
+
+  detach: function (element, format, trigger) {
+    var editor = CKEDITOR.dom.element.get(element).getEditor();
+    if (editor) {
+      if (trigger === 'serialize') {
+        editor.updateElement();
+      }
+      else {
+        editor.destroy();
+      }
+    }
+    return !!editor;
+  }
+
+};
+
+})(Drupal, CKEDITOR);

core/modules/ckeditor/js/ckeditor.stylescombo.admin.js

+(function ($, Drupal) {
+
+"use strict";
+
+/**
+ * Shows the "stylescombo" plugin settings only when the button is enabled.
+ */
+Drupal.behaviors.ckeditorStylesComboSettingsVisibility = {
+  attach: function (context) {
+    var $stylesComboVerticalTab = $('#edit-editor-settings-plugins-stylescombo').data('verticalTab');
+
+    // Hide if the "Styles" button is disabled.
+    if ($('.ckeditor-toolbar-disabled li[data-button-name="Styles"]').length === 1) {
+      $stylesComboVerticalTab.tabHide();
+    }
+
+    // React to added/removed toolbar buttons.
+    $(context)
+      .find('.ckeditor-toolbar-active')
+      .on('CKEditorToolbarChanged', function (e, action, button) {
+        if (button === 'Styles') {
+          if (action === 'added') {
+            $stylesComboVerticalTab.tabShow();
+          }
+          else {
+            $stylesComboVerticalTab.tabHide();
+          }
+        }
+      });
+  }
+};
+
+/**
+ * Provides the summary for the "stylescombo" plugin settings vertical tab.
+ */
+Drupal.behaviors.ckeditorStylesComboSettingsSummary = {
+  attach: function () {
+    $('#edit-editor-settings-plugins-stylescombo').drupalSetSummary(function (context) {
+      var styles = $.trim($('#edit-editor-settings-plugins-stylescombo-styles').val());
+      if (styles.length === 0) {
+        return Drupal.t('No styles configured');
+      }
+      else {
+        var count = $.trim(styles).split("\n").length;
+        return Drupal.t('@count styles configured', { '@count': count});
+      }
+    });
+  }
+};
+
+})(jQuery, Drupal);

core/modules/ckeditor/lib/Drupal/ckeditor/CKEditorPluginBase.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\ckeditor\Plugin\CKEditorPluginBase.
+ */
+
+namespace Drupal\ckeditor;
+
+use Drupal\Component\Plugin\PluginBase;
+use Drupal\editor\Plugin\Core\Entity\Editor;
+
+/**
+ * Defines a base CKEditor plugin implementation.
+ *
+ * No other CKEditor plugins can be internal, unless a different CKEditor build
+ * than the one provided by Drupal core is used. Most CKEditor plugins don't
+ * need to provide additional settings forms.
+ *
+ * This base assumes that your plugin has buttons that you want to be enabled
+ * through the toolbar builder UI. It is still possible to also implement the
+ * CKEditorPluginContextualInterface (for contextual enabling) and
+ *