Expose extractHostFromURL to API

src/FilterEngine.cpp

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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
@@ skipping 268 matching lines @@
 
 void FilterEngine::SetPref(const std::string& pref, JsValuePtr value)
 {
   JsValuePtr func = jsEngine->Evaluate("API.setPref");
   JsValueList params;
   params.push_back(jsEngine->NewValue(pref));
   params.push_back(value);
   func->Call(params);
 }
 
+std::string FilterEngine::GetHostFromURL(const std::string& url)
+{
+  JsValuePtr func = jsEngine->Evaluate("API.getHostFromUrl");
+  JsValueList params;
+  params.push_back(jsEngine->NewValue(url));
+  return func->Call(params)->AsString();
+}
+
+
 void FilterEngine::ForceUpdateCheck(FilterEngine::UpdaterCallback callback)
 {
   std::string eventName = "updateCheckDone";
   eventName += ++updateCheckId;
 
   jsEngine->SetEventCallback(eventName, std::tr1::bind(&FilterEngine::UpdateCheckDone,
       this, eventName, callback, std::tr1::placeholders::_1));
 
   JsValuePtr func = jsEngine->Evaluate("API.forceUpdateCheck");
   JsValueList params;
@@ skipping 19 matching lines @@
 {
   jsEngine->RemoveEventCallback("filterChange");
 }
 
 void FilterEngine::FilterChanged(FilterEngine::FilterChangeCallback callback, JsValueList& params)
 {
   std::string action(params.size() >= 1 && !params[0]->IsNull() ? params[0]->AsString() : "");
   JsValuePtr item(params.size() >= 2 ? params[1] : jsEngine->NewValue(false));
   callback(action, item);
 }