MD Settings: Spellcheck subsection secondary text

chrome/browser/resources/settings/languages_page/languages_page.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview 'settings-languages-page' is the settings page
  * for language and input method settings.
  */
 (function() {
 'use strict';
@@ skipping 145 matching lines @@
    * @private
    */
   spellCheckLanguages_: function() {
     assert(!cr.isMac);
     return this.languages.enabled.filter(function(languageState) {
       return languageState.language.supportsSpellcheck;
     });
   },
 
   /**
+   * Returns the secondary text for the spell check subsection based on the
+   * enabled spell check languages, listing at most 2 languages.
+   * @return {string}
+   * @private
+   */
+  getSpellCheckSecondaryText_: function() {
+    var enabledSpellCheckLanguages =
+        this.languages.enabled.filter(function(languageState) {
+          return languageState.spellCheckEnabled &&
+                 languageState.language.supportsSpellcheck;
+        });
+    switch (enabledSpellCheckLanguages.length) {
+      case 0:
+        return '';
+      case 1:
+        return enabledSpellCheckLanguages[0].language.displayName;
+      case 2:
+        return loadTimeData.getStringF(
+            'spellCheckSummaryTwoLanguages',
+            enabledSpellCheckLanguages[0].language.displayName,
+            enabledSpellCheckLanguages[1].language.displayName);
+      case 3:
+        // "foo, bar, and 1 other"
+        return loadTimeData.getStringF(
+            'spellCheckSummaryThreeLanguages',
+            enabledSpellCheckLanguages[0].language.displayName,
+            enabledSpellCheckLanguages[1].language.displayName);
+      default:
+        // "foo, bar, and [N-2] others"
+        return loadTimeData.getStringF(
+            'spellCheckSummaryMultipleLanguages',
+            enabledSpellCheckLanguages[0].language.displayName,
+            enabledSpellCheckLanguages[1].language.displayName,
+            (enabledSpellCheckLanguages.length - 2).toLocaleString());
+    }
+  },
+
+  /**
    * Opens the Custom Dictionary page.
    * @private
    */
   onEditDictionaryTap_: function() {
     assert(!cr.isMac);
     this.$.pages.setSubpageChain(['edit-dictionary']);
     this.forceRenderList_('settings-edit-dictionary-page');
   },
 
   /**
@@ skipping 72 matching lines @@
    * HACK(michaelpg): This is necessary to show the list when navigating to
    * the sub-page. Remove this function when PolymerElements/neon-animation#60
    * is fixed.
    * @param {string} tagName Name of the element containing the <iron-list>.
    */
   forceRenderList_: function(tagName) {
     this.$$(tagName).$$('iron-list').fire('iron-resize');
   },
 });
 })();