Issue 6538, 6781 - Implement support for snippet filters

lib/filterListener.js

Index: lib/filterListener.js
===================================================================
--- a/lib/filterListener.js
+++ b/lib/filterListener.js
@@ -24,19 +24,21 @@
 
 const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
 const {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
 
 const {FilterStorage} = require("./filterStorage");
 const {FilterNotifier} = require("./filterNotifier");
 const {ElemHide} = require("./elemHide");
 const {ElemHideEmulation} = require("./elemHideEmulation");
+const {Snippets} = require("./snippets");
 const {defaultMatcher} = require("./matcher");
 const {ActiveFilter, RegExpFilter,
-       ElemHideBase, ElemHideEmulationFilter} = require("./filterClasses");
+       ElemHideBase, ElemHideEmulationFilter,
+       SnippetFilter} = require("./filterClasses");
 const {Prefs} = require("prefs");
 
 /**
  * Increases on filter changes, filters will be saved if it exceeds 1.
  * @type {number}
  */
 let isDirty = 0;
 
@@ -153,16 +155,18 @@
     defaultMatcher.add(filter);
   else if (filter instanceof ElemHideBase)
   {
     if (filter instanceof ElemHideEmulationFilter)
       ElemHideEmulation.add(filter);
     else
       ElemHide.add(filter);
   }
+  else if (filter instanceof SnippetFilter)
+    Snippets.add(filter);
 }
 
 /**
  * Notifies Matcher instances or ElemHide object about removal of a filter
  * if necessary.
  * @param {Filter} filter filter that has been removed
  */
 function removeFilter(filter)
@@ -189,16 +193,18 @@
     defaultMatcher.remove(filter);
   else if (filter instanceof ElemHideBase)
   {
     if (filter instanceof ElemHideEmulationFilter)
       ElemHideEmulation.remove(filter);
     else
       ElemHide.remove(filter);
   }
+  else if (filter instanceof SnippetFilter)
+    Snippets.remove(filter);
 }
 
 const primes = [101, 109, 131, 149, 163, 179, 193, 211, 229, 241];
 
 function addFilters(filters)
 {
   // We add filters using pseudo-random ordering. Reason is that ElemHide will
   // assign consecutive filter IDs that might be visible to the website. The
@@ -308,16 +314,17 @@
 
 function onLoad()
 {
   isDirty = 0;
 
   defaultMatcher.clear();
   ElemHide.clear();
   ElemHideEmulation.clear();
+  Snippets.clear();
   for (let subscription of FilterStorage.subscriptions)
   {
     if (!subscription.disabled)
       addFilters(subscription.filters);
   }
 }
 
 function onSave()