Issue 4871 - Start using ESLint for adblockplusui

i18n.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+"use strict";
+
 // This variable should no longer be necessary once options.js in Chrome
 // accesses ext.i18n directly.
-var i18n = ext.i18n;
+let {i18n} = ext;
 
 // Getting UI locale cannot be done synchronously on Firefox,
 // requires messaging the background page. For Chrome and Safari,
 // we could get the UI locale here, but would need to duplicate
 // the logic implemented in Utils.appLocale.
 ext.backgroundPage.sendMessage(
   {
     type: "app.get",
     what: "localeInfo"
   },
-  function(localeInfo)
+  localeInfo =>
   {
     document.documentElement.lang = localeInfo.locale;
     document.documentElement.dir = localeInfo.bidiDir;
   }
 );
 
-// Inserts i18n strings into matching elements. Any inner HTML already in the element is
-// parsed as JSON and used as parameters to substitute into placeholders in the i18n
-// message.
-ext.i18n.setElementText = function(element, stringName, arguments)
+// Inserts i18n strings into matching elements. Any inner HTML already
+// in the element is parsed as JSON and used as parameters to
+// substitute into placeholders in the i18n message.
+ext.i18n.setElementText = function(element, stringName, args)
 {
-  function processString(str, element)
+  function processString(str, currentElement)
   {
-    var match = /^(.*?)<(a|strong)>(.*?)<\/\2>(.*)$/.exec(str);
+    let match = /^(.*?)<(a|strong)>(.*?)<\/\2>(.*)$/.exec(str);
     if (match)
     {
-      processString(match[1], element);
+      processString(match[1], currentElement);
 
-      var e = document.createElement(match[2]);
+      let e = document.createElement(match[2]);
       processString(match[3], e);
-      element.appendChild(e);
+      currentElement.appendChild(e);
 
-      processString(match[4], element);
+      processString(match[4], currentElement);
     }
     else
-      element.appendChild(document.createTextNode(str));
+      currentElement.appendChild(document.createTextNode(str));
   }
 
   while (element.lastChild)
     element.removeChild(element.lastChild);
-  processString(ext.i18n.getMessage(stringName, arguments), element);
-}
+  processString(ext.i18n.getMessage(stringName, args), element);
+};
 
 // Loads i18n strings
 function loadI18nStrings()
 {
   function addI18nStringsToElements(containerElement)
   {
-    var elements = containerElement.querySelectorAll("[class^='i18n_']");
-    for(var i = 0; i < elements.length; i++)
+    for (let node of containerElement.querySelectorAll("[class^='i18n_']"))

[Thomas Greiner, 2017/03/01 17:39:35]

Detail: Again, it'd be nice if we could keep this in a separate line to make it
more readable.

[kzar, 2017/03/07 12:48:32]

Done.

     {
-      var node = elements[i];
-      var arguments = JSON.parse("[" + node.textContent + "]");
-      if (arguments.length == 0)
-        arguments = null;
+      let args = JSON.parse("[" + node.textContent + "]");
+      if (args.length == 0)
+        args = null;
 
-      var className = node.className;
+      let {className} = node;
       if (className instanceof SVGAnimatedString)
         className = className.animVal;
-      var stringName = className.split(/\s/)[0].substring(5);
+      let stringName = className.split(/\s/)[0].substring(5);
 
-      ext.i18n.setElementText(node, stringName, arguments);
+      ext.i18n.setElementText(node, stringName, args);
     }
   }
   addI18nStringsToElements(document);
   // Content of Template is not rendered on runtime so we need to add
-  // translation strings for each Template documentFragment content individually 
-  var templates = document.querySelectorAll("template");
-  for (var i = 0; i < templates.length; i++)
-    addI18nStringsToElements(templates[i].content);
+  // translation strings for each Template documentFragment content
+  // individually.
+  for (let template of document.querySelectorAll("template"))
+    addI18nStringsToElements(template.content);
 }
 
 // Provides a more readable string of the current date and time
-function i18n_timeDateStrings(when)
+function i18nTimeDateStrings(when)

[Thomas Greiner, 2017/03/01 17:39:35]

Note that this function is used in the current options page in adblockpluschrome
so renaming it here means that we'll also have to rename it there.

[kzar, 2017/03/02 04:36:01]

Yep, don't worry I've done that. Actually come to think of it perhaps I didn't
update that codereview yet... will check now.

[Thomas Greiner, 2017/03/07 13:33:01]

Great, thanks.

 {
-  var d = new Date(when);
-  var timeString = d.toLocaleTimeString();
+  let d = new Date(when);
+  let timeString = d.toLocaleTimeString();
 
-  var now = new Date();
+  let now = new Date();
   if (d.toDateString() == now.toDateString())
     return [timeString];
-  else
-    return [timeString, d.toLocaleDateString()];
+  return [timeString, d.toLocaleDateString()];
 }
 
 // Formats date string to ["YYYY-MM-DD", "mm:ss"] format
-function i18n_formatDateTime(when)
+function i18nFormatDateTime(when)
 {
-  var date = new Date(when);
-  var dateParts = [date.getFullYear(), date.getMonth() + 1, date.getDate(),
-                  date.getHours(), date.getMinutes()];
+  let date = new Date(when);
+  let dateParts = [date.getFullYear(), date.getMonth() + 1, date.getDate(),
+                   date.getHours(), date.getMinutes()];
 
-  var dateParts = dateParts.map(function(datePart)
-  {
-    return datePart < 10 ? "0" + datePart : datePart;
-  });
+  dateParts = dateParts.map(
+    datePart => datePart < 10 ? "0" + datePart : datePart
+  );
 
   return [dateParts.splice(0, 3).join("-"), dateParts.join(":")];
 }
 
 // Fill in the strings as soon as possible
 window.addEventListener("DOMContentLoaded", loadI18nStrings, true);