Issue 4864 - Start using ESLint for adblockpluschrome

options.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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/>.
  */
 
+/* global $, i18n, i18nTimeDateStrings */
+
 "use strict";
 
 /**
  * Creates a wrapping function used to conveniently send a type of message.
  *
  * @param {Object} baseMessage The part of the message that's always sent
- * @param {..string} paramKeys Any message keys that have dynamic values. The
- *                             returned function will take the corresponding
- *                             values as arguments.
- * @return The generated messaging function, optionally taking any values as
- *         specified by the paramKeys and finally an optional callback.
- *         (Although the value arguments are optional their index must be
- *          maintained. E.g. if you omit the first value you must omit the
- *          second too.)
+ * @param {...string} paramKeys Any message keys that have dynamic values. The
+ *                              returned function will take the corresponding
+ *                              values as arguments.
+ * @return {function} The generated messaging function, optionally
+ *                    taking any values as specified by the paramKeys
+ *                    and finally an optional callback.  (Although the
+ *                    value arguments are optional their index must be
+ *                    maintained. E.g. if you omit the first value you
+ *                    must omit the second too.)
  */
-function wrapper(baseMessage /* , [paramKeys] */)
+function wrapper(baseMessage, ...paramKeys)
 {
-  let paramKeys = [];
-  for (let i = 1; i < arguments.length; i++)
-    paramKeys.push(arguments[i]);
-
-  return function(/* [paramValues], callback */)
+  return function(...paramValues /* , callback */)
   {
     let message = Object.create(null);
     for (let key in baseMessage)
+    {
       if (baseMessage.hasOwnProperty(key))
         message[key] = baseMessage[key];
+    }
 
-    let paramValues = [];
     let callback;
 
-    if (arguments.length > 0)
+    if (paramValues.length > 0)
     {
-      let lastArg = arguments[arguments.length - 1];
+      let lastArg = paramValues[paramValues.length - 1];
       if (typeof lastArg == "function")
         callback = lastArg;
 
-      for (let i = 0; i < arguments.length - (callback ? 1 : 0); i++)
-        message[paramKeys[i]] = arguments[i];
+      for (let i = 0; i < paramValues.length - (callback ? 1 : 0); i++)
+        message[paramKeys[i]] = paramValues[i];
     }
 
     ext.backgroundPage.sendMessage(message, callback);
   };
 }
 
 const getDocLink = wrapper({type: "app.get", what: "doclink"}, "link");
 const getInfo = wrapper({type: "app.get"}, "what");
 const getPref = wrapper({type: "prefs.get"}, "key");
 const togglePref = wrapper({type: "prefs.toggle"}, "key");
 const getSubscriptions = wrapper({type: "subscriptions.get"},
                                  "downloadable", "special");
 const removeSubscription = wrapper({type: "subscriptions.remove"}, "url");
 const addSubscription = wrapper({type: "subscriptions.add"},
                                 "url", "title", "homepage");
 const toggleSubscription = wrapper({type: "subscriptions.toggle"},
                                    "url", "keepInstalled");
 const updateSubscription = wrapper({type: "subscriptions.update"}, "url");
 const importRawFilters = wrapper({type: "filters.importRaw"},
                                  "text", "removeExisting");
 const addFilter = wrapper({type: "filters.add"}, "text");
 const getFilters = wrapper({type: "filters.get"}, "subscriptionUrl");
 const removeFilter = wrapper({type: "filters.remove"}, "text");
 
-const whitelistedDomainRegexp = /^@@\|\|([^\/:]+)\^\$document$/;
+const whitelistedDomainRegexp = /^@@\|\|([^/:]+)\^\$document$/;
+const statusMessages = new Map([
+   ["synchronize_invalid_url",
+    "filters_subscription_lastDownload_invalidURL"],
+   ["synchronize_connection_error",
+    "filters_subscription_lastDownload_connectionError"],
+   ["synchronize_invalid_data",
+    "filters_subscription_lastDownload_invalidData"],
+   ["synchronize_checksum_mismatch",
+    "filters_subscription_lastDownload_checksumMismatch"]
+]);
+
 let delayedSubscriptionSelection = null;
-
 let acceptableAdsUrl;
 
 // Loads options from localStorage and sets UI elements accordingly
 function loadOptions()
 {
   // Set page title to i18n version of "Adblock Plus Options"
   document.title = i18n.getMessage("options");
 
   // Set links
   getPref("subscriptions_exceptionsurl", url =>
@@ skipping 46 matching lines @@
   // Popuplate option checkboxes
   initCheckbox("shouldShowBlockElementMenu");
   initCheckbox("show_devtools_panel");
   initCheckbox("shouldShowNotifications", "notifications_ignoredcategories");
 
   getInfo("features", features =>
   {
     if (!features.devToolsPanel)
       document.getElementById("showDevtoolsPanelContainer").hidden = true;
   });
-  getPref("notifications_showui", notifications_showui =>
+  getPref("notifications_showui", showNotificationsUI =>
   {
-    if (!notifications_showui)
+    if (!showNotificationsUI)
       document.getElementById("shouldShowNotificationsContainer").hidden = true;
   });
 
   // Register listeners in the background message responder
   ext.backgroundPage.sendMessage({
     type: "app.listen",
     filter: ["addSubscription", "focusSection"]
   });
-  ext.backgroundPage.sendMessage(
-  {
+  ext.backgroundPage.sendMessage({
     type: "filters.listen",
     filter: ["added", "loaded", "removed"]
   });
-  ext.backgroundPage.sendMessage(
-  {
+  ext.backgroundPage.sendMessage({
     type: "prefs.listen",
     filter: ["notifications_ignoredcategories", "notifications_showui",
              "show_devtools_panel", "shouldShowBlockElementMenu"]
   });
-  ext.backgroundPage.sendMessage(
-  {
+  ext.backgroundPage.sendMessage({
     type: "subscriptions.listen",
     filter: ["added", "disabled", "homepage", "lastDownload", "removed",
              "title", "downloadStatus", "downloading"]
   });
 
   // Load recommended subscriptions
   loadRecommendations();
 
   // Show user's filters
   reloadFilters();
@@ skipping 122 matching lines @@
 
       let option = new Option();
       let label = i18n.getMessage("filters_addSubscriptionOther_label");
       option.text = label + "\u2026";
       option._data = null;
       list.appendChild(option);
 
       list.selectedIndex = selectedIndex;
 
       if (delayedSubscriptionSelection)
-        startSubscriptionSelection.apply(null, delayedSubscriptionSelection);
+        startSubscriptionSelection(...delayedSubscriptionSelection);
     });
 }
 
 function startSubscriptionSelection(title, url)
 {
   let list = document.getElementById("subscriptionSelector");
   if (list.length == 0)
   {
     delayedSubscriptionSelection = [title, url];
     return;
@@ skipping 27 matching lines @@
 }
 
 function addSubscriptionClicked()
 {
   let list = document.getElementById("subscriptionSelector");
   let data = list.options[list.selectedIndex]._data;
   if (data)
     addSubscription(data.url, data.title, data.homepage);
   else
   {
-    let url = document.getElementById("customSubscriptionLocation").value.trim();
+    let url = document.getElementById("customSubscriptionLocation")
+                      .value.trim();
     if (!/^https?:/i.test(url))
     {
       alert(i18n.getMessage("global_subscription_invalid_location"));
       $("#customSubscriptionLocation").focus();
       return;
     }
 
     let title = document.getElementById("customSubscriptionTitle").value.trim();
     if (!title)
       title = url;
 
     addSubscription(url, title, null);
   }
 
   $("#addSubscriptionContainer").hide();
   $("#customSubscriptionContainer").hide();
   $("#addSubscriptionButton").show();
 }
 
 function toggleAcceptableAds()
 {
   toggleSubscription(acceptableAdsUrl, true);
 }
 
 function findSubscriptionElement(subscription)
 {
   for (let child of document.getElementById("filterLists").childNodes)
+  {
     if (child._subscription.url == subscription.url)
       return child;
+  }
   return null;
 }
 
 function updateSubscriptionInfo(element, subscription)
 {
   if (subscription)
     element._subscription = subscription;
   else
     subscription = element._subscription;
 
   let title = element.getElementsByClassName("subscriptionTitle")[0];
   title.textContent = subscription.title;
   title.setAttribute("title", subscription.url);
   if (subscription.homepage)
     title.href = subscription.homepage;
   else
     title.href = subscription.url;
 
   let enabled = element.getElementsByClassName("subscriptionEnabled")[0];
   enabled.checked = !subscription.disabled;
 
   let lastUpdate = element.getElementsByClassName("subscriptionUpdate")[0];
   lastUpdate.classList.remove("error");
 
-  let downloadStatus = subscription.downloadStatus;
+  let {downloadStatus} = subscription;
   if (subscription.isDownloading)
   {
-    lastUpdate.textContent = i18n.getMessage("filters_subscription_lastDownload_inProgress");
+    lastUpdate.textContent = i18n.getMessage(
+      "filters_subscription_lastDownload_inProgress"
+    );
   }
   else if (downloadStatus && downloadStatus != "synchronize_ok")
   {
-     let map =
-     {
-       "synchronize_invalid_url": "filters_subscription_lastDownload_invalidURL",
-       "synchronize_connection_error": "filters_subscription_lastDownload_connectionError",
-       "synchronize_invalid_data": "filters_subscription_lastDownload_invalidData",
-       "synchronize_checksum_mismatch": "filters_subscription_lastDownload_checksumMismatch"
-     };
-     if (downloadStatus in map)
-       lastUpdate.textContent = i18n.getMessage(map[downloadStatus]);
-     else
-       lastUpdate.textContent = downloadStatus;
-     lastUpdate.classList.add("error");
+    if (statusMessages.has(downloadStatus))
+    {
+      lastUpdate.textContent = i18n.getMessage(
+        statusMessages.get(downloadStatus)
+      );
+    }
+    else
+      lastUpdate.textContent = downloadStatus;
+    lastUpdate.classList.add("error");
   }
   else if (subscription.lastDownload > 0)
   {
-    let timeDate = i18n_timeDateStrings(subscription.lastDownload * 1000);
+    let timeDate = i18nTimeDateStrings(subscription.lastDownload * 1000);
     let messageID = (timeDate[1] ? "last_updated_at" : "last_updated_at_today");
     lastUpdate.textContent = i18n.getMessage(messageID, timeDate);
   }
 }
 
 function onSubscriptionMessage(action, subscription)
 {
   let element = findSubscriptionElement(subscription);
 
   switch (action)
@@ skipping 22 matching lines @@
         element.parentNode.removeChild(element);
       break;
   }
 }
 
 function onPrefMessage(key, value)
 {
   switch (key)
   {
     case "notifications_showui":
-      document.getElementById("shouldShowNotificationsContainer").hidden = !value;
+      document.getElementById(
+        "shouldShowNotificationsContainer"
+      ).hidden = !value;
       return;
     case "notifications_ignoredcategories":
       key = "shouldShowNotifications";
       value = value.indexOf("*") == -1;
       break;
   }
   let checkbox = document.getElementById(key);
   if (checkbox)
     checkbox.checked = value;
 }
@@ skipping 36 matching lines @@
   let list = document.getElementById(boxId);
   let selector = "option[value=" + CSS.escape(text) + "]";
   for (let option of list.querySelectorAll(selector))
     list.removeChild(option);
 }
 
 function addWhitelistDomain(event)
 {
   event.preventDefault();
 
-  let domain = document.getElementById("newWhitelistDomain").value.replace(/\s/g, "");
+  let domain = document.getElementById(
+    "newWhitelistDomain"
+  ).value.replace(/\s/g, "");
   document.getElementById("newWhitelistDomain").value = "";
   if (!domain)
     return;
 
   let filterText = "@@||" + domain + "^$document";
   addFilter(filterText);
 }
 
 // Adds filter text that user typed to the selection box
 function addTypedFilter(event)
 {
   event.preventDefault();
 
   let element = document.getElementById("newFilter");
   addFilter(element.value, errors =>
   {
     if (errors.length > 0)
       alert(errors.join("\n"));
     else
       element.value = "";
   });
 }
 
 // Removes currently selected whitelisted domains
 function removeSelectedExcludedDomain(event)
 {
   event.preventDefault();
   let remove = [];
   for (let option of document.getElementById("excludedDomainsBox").options)
+  {
     if (option.selected)
       remove.push(option.value);
+  }
   if (!remove.length)
     return;
 
   for (let domain of remove)
     removeFilter("@@||" + domain + "^$document");
 }
 
 // Removes all currently selected filters
 function removeSelectedFilters(event)
 {
   event.preventDefault();
-  for (let option of document.querySelectorAll("#userFiltersBox > option:checked"))
+  let options = document.querySelectorAll("#userFiltersBox > option:checked");
+  for (let option of options)
     removeFilter(option.value);
 }
 
 // Shows raw filters box and fills it with the current user filters
 function toggleFiltersInRawFormat(event)
 {
   event.preventDefault();
 
   let rawFilters = document.getElementById("rawFilters");
   let filters = [];
 
   if (rawFilters.style.display != "table-row")
   {
     rawFilters.style.display = "table-row";
     for (let option of document.getElementById("userFiltersBox").options)
       filters.push(option.value);
   }
   else
-  {
     rawFilters.style.display = "none";
-  }
 
   document.getElementById("rawFiltersText").value = filters.join("\n");
 }
 
 // Imports filters in the raw text box
 function importRawFiltersText()
 {
   let text = document.getElementById("rawFiltersText").value;
 
   importRawFilters(text, true, errors =>
@@ skipping 13 matching lines @@
 }
 
 // Adds a subscription entry to the UI.
 function addSubscriptionEntry(subscription)
 {
   let template = document.getElementById("subscriptionTemplate");
   let element = template.cloneNode(true);
   element.removeAttribute("id");
   element._subscription = subscription;
 
-  let removeButton = element.getElementsByClassName("subscriptionRemoveButton")[0];
+  let removeButton = element.getElementsByClassName(
+    "subscriptionRemoveButton"
+  )[0];
   removeButton.setAttribute("title", removeButton.textContent);
   removeButton.textContent = "\xD7";
   removeButton.addEventListener("click", () =>
   {
     if (!confirm(i18n.getMessage("global_remove_subscription_warning")))
       return;
 
     removeSubscription(subscription.url);
   }, false);
 
   getPref("additional_subscriptions", additionalSubscriptions =>
   {
     if (additionalSubscriptions.indexOf(subscription.url) != -1)
       removeButton.style.visibility = "hidden";
   });
 
   let enabled = element.getElementsByClassName("subscriptionEnabled")[0];
   enabled.addEventListener("click", () =>
   {
     subscription.disabled = !subscription.disabled;
     toggleSubscription(subscription.url, true);
   }, false);
 
   updateSubscriptionInfo(element);
 
   document.getElementById("filterLists").appendChild(element);
 }
 
-function setLinks(id)
+function setLinks(id, ...args)
 {
   let element = document.getElementById(id);
   if (!element)
     return;
 
   let links = element.getElementsByTagName("a");
   for (let i = 0; i < links.length; i++)
   {
-    if (typeof arguments[i + 1] == "string")
+    if (typeof args[i] == "string")
     {
-      links[i].href = arguments[i + 1];
+      links[i].href = args[i];
       links[i].setAttribute("target", "_blank");
     }
-    else if (typeof arguments[i + 1] == "function")
+    else if (typeof args[i] == "function")
     {
       links[i].href = "javascript:void(0);";
-      links[i].addEventListener("click", arguments[i + 1], false);
+      links[i].addEventListener("click", args[i], false);
     }
   }
 }
 
 ext.onMessage.addListener(message =>
 {
   switch (message.type)
   {
     case "app.respond":
       switch (message.action)
@@ skipping 26 matching lines @@
       onFilterMessage(message.action, message.args[0]);
       break;
     case "prefs.respond":
       onPrefMessage(message.action, message.args[0]);
       break;
     case "subscriptions.respond":
       onSubscriptionMessage(message.action, message.args[0]);
       break;
   }
 });