Issue 1282 - Don't generate filters conflicting with existing exception rules

background.js

Index: background.js
===================================================================
--- a/background.js
+++ b/background.js
@@ -519,6 +519,50 @@
       else
         sendResponse(false);
       break;
+    case "check-whitelisted-urls":
+      var documentHost = extractHostFromFrame(sender.frame);
+      var sitekey = getKey(sender.page, sender.frame);
+
+      var result = Object.create(null);
+      for (var i = 0; i < msg.urls.length; i++)
+      {
+        var requestUrl = msg.urls[i];
+        var requestHost = extractHostFromURL(requestUrl);
+
+        var filter = defaultMatcher.matchesAny(
+          requestUrl, msg.mediatype, documentHost,
+          isThirdParty(requestHost, documentHost),
+          sitekey
+        );
+
+        result[requestUrl] = filter instanceof WhitelistFilter;
+      }
+
+      sendResponse(result);
+      break;
+    case "get-filters-from-selectors":
+      var filters = [];
+      var selectors = [];
+
+      if (!isFrameWhitelisted(sender.page, sender.frame, "ELEMHIDE"))
+      {
+        var documentHost = extractHostFromFrame(sender.frame);
+
+        for (var i = 0; i < msg.selectors.length; i++)
+        {
+          var selector = msg.selectors[i];
+          var filter = documentHost + "##" + selector;
+
+          if (!ElemHide.getException(Filter.fromText(filter), documentHost))
+          {
+            filters.push(filter);
+            selectors.push(selector);
+          }
+        }
+      }
+
+      sendResponse({filters: filters, selectors: selectors});
+      break;
     case "get-domain-enabled-state":
       // Returns whether this domain is in the exclusion list.
       // The browser action popup asks us this.