Page Speed Optimization Libraries  1.7.30.3
net/instaweb/rewriter/public/js_disable_filter.h
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00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_
00021 
00022 #include "net/instaweb/http/public/user_agent_matcher.h"
00023 #include "net/instaweb/rewriter/public/common_filter.h"
00024 #include "net/instaweb/rewriter/public/script_tag_scanner.h"
00025 #include "net/instaweb/util/public/basictypes.h"
00026 #include "net/instaweb/util/public/string.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class HtmlElement;
00031 class RewriteDriver;
00032 class RewriteOptions;
00033 
00041 class JsDisableFilter : public CommonFilter {
00042  public:
00043   explicit JsDisableFilter(RewriteDriver* driver);
00044   ~JsDisableFilter();
00045 
00046   static const char kEnableJsExperimental[];
00047   static const char kElementOnloadCode[];
00048 
00049   virtual void DetermineEnabled();
00050 
00051   virtual const char* Name() const {
00052     return "JsDisableFilter";
00053   }
00054 
00055  private:
00056   virtual void StartDocumentImpl();
00057 
00058   virtual void StartElementImpl(HtmlElement* element);
00059 
00060   virtual void EndElementImpl(HtmlElement* element);
00061 
00062   virtual void EndDocument();
00063 
00065   void InsertJsDeferExperimentalScript();
00066 
00070   void InsertMetaTagForIE(HtmlElement* element);
00071 
00072   RewriteDriver* rewrite_driver_;
00073   ScriptTagScanner script_tag_scanner_;
00074   int index_;
00075   bool ie_meta_tag_written_;
00076   int prefetch_js_elements_count_;
00077   int max_prefetch_js_elements_;
00078   GoogleString prefetch_js_elements_;
00079   bool should_look_for_prefetch_js_elements_;
00080   UserAgentMatcher::PrefetchMechanism prefetch_mechanism_;
00081 
00082   DISALLOW_COPY_AND_ASSIGN(JsDisableFilter);
00083 };
00084 
00085 }  
00086 
00087 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_
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