Issue 4878 - Start using ESLint for adblockpluscore

lib/subscriptionClasses.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";
+
 /**
  * @fileOverview Definition of Subscription class and its subclasses.
  */
 
-let {ActiveFilter, BlockingFilter, WhitelistFilter, ElemHideBase} = require("filterClasses");
-let {FilterNotifier} = require("filterNotifier");
-let {desc, extend} = require("coreUtils");
+const {ActiveFilter, BlockingFilter,
+       WhitelistFilter, ElemHideBase} = require("filterClasses");
+const {FilterNotifier} = require("filterNotifier");
+const {desc, extend} = require("coreUtils");
 
 /**
  * Abstract base class for filter subscriptions
  *
- * @param {String} url    download location of the subscription
- * @param {String} [title]  title of the filter subscription
+ * @param {string} url    download location of the subscription
+ * @param {string} [title]  title of the filter subscription
  * @constructor
  */
 function Subscription(url, title)
 {
   this.url = url;
   this.filters = [];
   if (title)
     this._title = title;
   Subscription.knownSubscriptions[url] = this;
 }
 exports.Subscription = Subscription;
 
 Subscription.prototype =
 {
   /**
    * Download location of the subscription
-   * @type String
+   * @type {string}
    */
   url: null,
 
   /**
    * Filters contained in the filter subscription
-   * @type Filter[]
+   * @type {Filter[]}
    */
   filters: null,
 
   _title: null,
   _fixedTitle: false,
   _disabled: false,
 
   /**
    * Title of the filter subscription
-   * @type String
+   * @type {string}
    */
   get title()
   {
     return this._title;
   },
   set title(value)
   {
     if (value != this._title)
     {
       let oldValue = this._title;
       this._title = value;
-      FilterNotifier.triggerListeners("subscription.title", this, value, oldValue);
+      FilterNotifier.triggerListeners("subscription.title",
+                                      this, value, oldValue);
     }
     return this._title;
   },
 
   /**
    * Determines whether the title should be editable
-   * @type Boolean
+   * @type {boolean}
    */
   get fixedTitle()
   {
     return this._fixedTitle;
   },
   set fixedTitle(value)
   {
     if (value != this._fixedTitle)
     {
       let oldValue = this._fixedTitle;
       this._fixedTitle = value;
-      FilterNotifier.triggerListeners("subscription.fixedTitle", this, value, oldValue);
+      FilterNotifier.triggerListeners("subscription.fixedTitle",
+                                      this, value, oldValue);
     }
     return this._fixedTitle;
   },
 
   /**
    * Defines whether the filters in the subscription should be disabled
-   * @type Boolean
+   * @type {boolean}
    */
   get disabled()
   {
     return this._disabled;
   },
   set disabled(value)
   {
     if (value != this._disabled)
     {
       let oldValue = this._disabled;
       this._disabled = value;
-      FilterNotifier.triggerListeners("subscription.disabled", this, value, oldValue);
+      FilterNotifier.triggerListeners("subscription.disabled",
+                                      this, value, oldValue);
     }
     return this._disabled;
   },
 
   /**
-   * Serializes the subscription to an array of strings for writing out on the disk.
+   * Serializes the subscription to an array of strings for writing
+   * out on the disk.
    * @param {string[]} buffer  buffer to push the serialization results into
    */
-  serialize: function(buffer)
+  serialize(buffer)
   {
     buffer.push("[Subscription]");
     buffer.push("url=" + this.url);
     if (this._title)
       buffer.push("title=" + this._title);
     if (this._fixedTitle)
       buffer.push("fixedTitle=true");
     if (this._disabled)
       buffer.push("disabled=true");
   },
 
-  serializeFilters: function(buffer)
+  serializeFilters(buffer)
   {
     for (let filter of this.filters)
       buffer.push(filter.text.replace(/\[/g, "\\["));
   },
 
-  toString: function()
+  toString()
   {
     let buffer = [];
     this.serialize(buffer);
     return buffer.join("\n");
   }
 };
 
 /**
  * Cache for known filter subscriptions, maps URL to subscription objects.
- * @type Object
+ * @type {Object}
  */
 Subscription.knownSubscriptions = Object.create(null);
 
 /**
  * Returns a subscription from its URL, creates a new one if necessary.
- * @param {String} url  URL of the subscription
- * @return {Subscription} subscription or null if the subscription couldn't be created
+ * @param {string} url  URL of the subscription
+ * @return {Subscription} subscription or null if the subscription couldn't be
+ *                        created
  */
 Subscription.fromURL = function(url)
 {
   if (url in Subscription.knownSubscriptions)
     return Subscription.knownSubscriptions[url];
 
   if (url[0] != "~")
     return new DownloadableSubscription(url, null);
-  else
-    return new SpecialSubscription(url);
+  return new SpecialSubscription(url);
 };
 
 /**
  * Deserializes a subscription
  *
  * @param {Object}  obj map of serialized properties and their values
- * @return {Subscription} subscription or null if the subscription couldn't be created
+ * @return {Subscription} subscription or null if the subscription couldn't be
+ *                        created
  */
 Subscription.fromObject = function(obj)
 {
   let result;
   if (obj.url[0] != "~")
   {
     // URL is valid - this is a downloadable subscription
     result = new DownloadableSubscription(obj.url, obj.title);
     if ("downloadStatus" in obj)
       result._downloadStatus = obj.downloadStatus;
@@ skipping 27 matching lines @@
   if ("fixedTitle" in obj)
     result._fixedTitle = (obj.fixedTitle == "true");
   if ("disabled" in obj)
     result._disabled = (obj.disabled == "true");
 
   return result;
 };
 
 /**
  * Class for special filter subscriptions (user's filters)
- * @param {String} url see Subscription()
- * @param {String} [title]  see Subscription()
+ * @param {string} url see Subscription()
+ * @param {string} [title]  see Subscription()
  * @constructor
  * @augments Subscription
  */
 function SpecialSubscription(url, title)
 {
   Subscription.call(this, url, title);
 }
 exports.SpecialSubscription = SpecialSubscription;
 
 SpecialSubscription.prototype = extend(Subscription, {
   /**
    * Filter types that should be added to this subscription by default
    * (entries should correspond to keys in SpecialSubscription.defaultsMap).
-   * @type string[]
+   * @type {string[]}
    */
   defaults: null,
 
   /**
    * Tests whether a filter should be added to this group by default
    * @param {Filter} filter filter to be tested
-   * @return {Boolean}
+   * @return {boolean}
    */
-  isDefaultFor: function(filter)
+  isDefaultFor(filter)
   {
     if (this.defaults && this.defaults.length)
     {
       for (let type of this.defaults)
       {
         if (filter instanceof SpecialSubscription.defaultsMap[type])
           return true;
         if (!(filter instanceof ActiveFilter) && type == "blacklist")
           return true;
       }
     }
 
     return false;
   },
 
   /**
    * See Subscription.serialize()
+   * @param {string[]} buffer  buffer to push the serialization results into
    */
-  serialize: function(buffer)
+  serialize(buffer)
   {
     Subscription.prototype.serialize.call(this, buffer);
     if (this.defaults && this.defaults.length)
-      buffer.push("defaults=" + this.defaults.filter((type) => type in SpecialSubscription.defaultsMap).join(" "));
+    {
+      buffer.push("defaults=" + this.defaults.filter(
+        type => type in SpecialSubscription.defaultsMap).join(" ")
+      );
+    }
     if (this._lastDownload)
       buffer.push("lastDownload=" + this._lastDownload);
   }
 });
 
 SpecialSubscription.defaultsMap = Object.create(null, desc({
-  "whitelist": WhitelistFilter,
-  "blocking": BlockingFilter,
-  "elemhide": ElemHideBase
+  whitelist: WhitelistFilter,
+  blocking: BlockingFilter,
+  elemhide: ElemHideBase
 }));
 
 /**
  * Creates a new user-defined filter group.
- * @param {String} [title]  title of the new filter group
- * @result {SpecialSubscription}
+ * @param {string} [title]  title of the new filter group
+ * @return {SpecialSubscription}
  */
 SpecialSubscription.create = function(title)
 {
   let url;
   do
-  {
-    url = "~user~" + Math.round(Math.random()*1000000);
-  } while (url in Subscription.knownSubscriptions);
+    url = "~user~" + Math.round(Math.random() * 1000000);
+  while (url in Subscription.knownSubscriptions);
   return new SpecialSubscription(url, title);
 };
 
 /**
  * Creates a new user-defined filter group and adds the given filter to it.
  * This group will act as the default group for this filter type.
+ * @param {Filter} filter
+ * @return {SpecialSubscription}
  */
-SpecialSubscription.createForFilter = function(/**Filter*/ filter) /**SpecialSubscription*/
+SpecialSubscription.createForFilter = function(filter)
 {
   let subscription = SpecialSubscription.create();
   subscription.filters.push(filter);
   for (let type in SpecialSubscription.defaultsMap)
   {
     if (filter instanceof SpecialSubscription.defaultsMap[type])
       subscription.defaults = [type];
   }
   if (!subscription.defaults)
     subscription.defaults = ["blocking"];
   return subscription;
 };
 
 /**
- * Abstract base class for regular filter subscriptions (both internally and externally updated)
- * @param {String} url    see Subscription()
- * @param {String} [title]  see Subscription()
+ * Abstract base class for regular filter subscriptions (both
+ * internally and externally updated)
+ * @param {string} url    see Subscription()
+ * @param {string} [title]  see Subscription()
  * @constructor
  * @augments Subscription
  */
 function RegularSubscription(url, title)
 {
   Subscription.call(this, url, title || url);
 }
 exports.RegularSubscription = RegularSubscription;
 
 RegularSubscription.prototype = extend(Subscription, {
   _homepage: null,
   _lastDownload: 0,
 
   /**
    * Filter subscription homepage if known
-   * @type String
+   * @type {string}
    */
   get homepage()
   {
     return this._homepage;
   },
   set homepage(value)
   {
     if (value != this._homepage)
     {
       let oldValue = this._homepage;
       this._homepage = value;
-      FilterNotifier.triggerListeners("subscription.homepage", this, value, oldValue);
+      FilterNotifier.triggerListeners("subscription.homepage",
+                                      this, value, oldValue);
     }
     return this._homepage;
   },
 
   /**
-   * Time of the last subscription download (in seconds since the beginning of the epoch)
-   * @type Number
+   * Time of the last subscription download (in seconds since the
+   * beginning of the epoch)
+   * @type {number}
    */
   get lastDownload()
   {
     return this._lastDownload;
   },
   set lastDownload(value)
   {
     if (value != this._lastDownload)
     {
       let oldValue = this._lastDownload;
       this._lastDownload = value;
-      FilterNotifier.triggerListeners("subscription.lastDownload", this, value, oldValue);
+      FilterNotifier.triggerListeners("subscription.lastDownload",
+                                      this, value, oldValue);
     }
     return this._lastDownload;
   },
 
   /**
    * See Subscription.serialize()
+   * @param {string[]} buffer
    */
-  serialize: function(buffer)
+  serialize(buffer)
   {
     Subscription.prototype.serialize.call(this, buffer);
     if (this._homepage)
       buffer.push("homepage=" + this._homepage);
     if (this._lastDownload)
       buffer.push("lastDownload=" + this._lastDownload);
   }
 });
 
 /**
  * Class for filter subscriptions updated externally (by other extension)
- * @param {String} url    see Subscription()
- * @param {String} [title]  see Subscription()
+ * @param {string} url    see Subscription()
+ * @param {string} [title]  see Subscription()
  * @constructor
  * @augments RegularSubscription
  */
 function ExternalSubscription(url, title)
 {
   RegularSubscription.call(this, url, title);
 }
 exports.ExternalSubscription = ExternalSubscription;
 
 ExternalSubscription.prototype = extend(RegularSubscription, {
   /**
    * See Subscription.serialize()
+   * @param {string[]} buffer
    */
-  serialize: function(buffer)
+  serialize(buffer)
   {
-    throw new Error("Unexpected call, external subscriptions should not be serialized");
+    throw new Error(
+      "Unexpected call, external subscriptions should not be serialized"
+    );
   }
 });
 
 /**
  * Class for filter subscriptions updated externally (by other extension)
- * @param {String} url  see Subscription()
- * @param {String} [title]  see Subscription()
+ * @param {string} url  see Subscription()
+ * @param {string} [title]  see Subscription()
  * @constructor
  * @augments RegularSubscription
  */
 function DownloadableSubscription(url, title)
 {
   RegularSubscription.call(this, url, title);
 }
 exports.DownloadableSubscription = DownloadableSubscription;
 
 DownloadableSubscription.prototype = extend(RegularSubscription, {
   _downloadStatus: null,
   _lastCheck: 0,
   _errors: 0,
 
   /**
    * Status of the last download (ID of a string)
-   * @type String
+   * @type {string}
    */
   get downloadStatus()
   {
     return this._downloadStatus;
   },
   set downloadStatus(value)
   {
     let oldValue = this._downloadStatus;
     this._downloadStatus = value;
-    FilterNotifier.triggerListeners("subscription.downloadStatus", this, value, oldValue);
+    FilterNotifier.triggerListeners("subscription.downloadStatus",
+                                    this, value, oldValue);
     return this._downloadStatus;
   },
 
   /**
    * Time of the last successful download (in seconds since the beginning of the
    * epoch).
    */
   lastSuccess: 0,
 
   /**
-   * Time when the subscription was considered for an update last time (in seconds
-   * since the beginning of the epoch). This will be used to increase softExpiration
-   * if the user doesn't use Adblock Plus for some time.
-   * @type Number
+   * Time when the subscription was considered for an update last time
+   * (in seconds since the beginning of the epoch). This will be used
+   * to increase softExpiration if the user doesn't use Adblock Plus
+   * for some time.
+   * @type {number}
    */
   get lastCheck()
   {
     return this._lastCheck;
   },
   set lastCheck(value)
   {
     if (value != this._lastCheck)
     {
       let oldValue = this._lastCheck;
       this._lastCheck = value;
-      FilterNotifier.triggerListeners("subscription.lastCheck", this, value, oldValue);
+      FilterNotifier.triggerListeners("subscription.lastCheck",
+                                      this, value, oldValue);
     }
     return this._lastCheck;
   },
 
   /**
-   * Hard expiration time of the filter subscription (in seconds since the beginning of the epoch)
-   * @type Number
+   * Hard expiration time of the filter subscription (in seconds since
+   * the beginning of the epoch)
+   * @type {number}
    */
   expires: 0,
 
   /**
-   * Soft expiration time of the filter subscription (in seconds since the beginning of the epoch)
-   * @type Number
+   * Soft expiration time of the filter subscription (in seconds since
+   * the beginning of the epoch)
+   * @type {number}
    */
   softExpiration: 0,
 
   /**
    * Number of download failures since last success
-   * @type Number
+   * @type {number}
    */
   get errors()
   {
     return this._errors;
   },
   set errors(value)
   {
     if (value != this._errors)
     {
       let oldValue = this._errors;
       this._errors = value;
-      FilterNotifier.triggerListeners("subscription.errors", this, value, oldValue);
+      FilterNotifier.triggerListeners("subscription.errors", this,
+                                      value, oldValue);
     }
     return this._errors;
   },
 
   /**
    * Version of the subscription data retrieved on last successful download
-   * @type Number
+   * @type {number}
    */
   version: 0,
 
   /**
    * Minimal Adblock Plus version required for this subscription
-   * @type String
+   * @type {string}
    */
   requiredVersion: null,
 
   /**
    * Number indicating how often the object was downloaded.
-   * @type Number
+   * @type {number}
    */
   downloadCount: 0,
 
   /**
    * See Subscription.serialize()
+   * @param {string[]} buffer
    */
-  serialize: function(buffer)
+  serialize(buffer)
   {
     RegularSubscription.prototype.serialize.call(this, buffer);
     if (this.downloadStatus)
       buffer.push("downloadStatus=" + this.downloadStatus);
     if (this.lastSuccess)
       buffer.push("lastSuccess=" + this.lastSuccess);
     if (this.lastCheck)
       buffer.push("lastCheck=" + this.lastCheck);
     if (this.expires)
       buffer.push("expires=" + this.expires);
     if (this.softExpiration)
       buffer.push("softExpiration=" + this.softExpiration);
     if (this.errors)
       buffer.push("errors=" + this.errors);
     if (this.version)
       buffer.push("version=" + this.version);
     if (this.requiredVersion)
       buffer.push("requiredVersion=" + this.requiredVersion);
     if (this.downloadCount)
       buffer.push("downloadCount=" + this.downloadCount);
   }
 });