Page Speed Optimization Libraries  1.5.27.2
net/instaweb/rewriter/public/detect_reflow_js_defer_filter.h
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00001 /*
00002  * Copyright 2011 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 
00019 
00020 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_DETECT_REFLOW_JS_DEFER_FILTER_H_
00021 #define NET_INSTAWEB_REWRITER_PUBLIC_DETECT_REFLOW_JS_DEFER_FILTER_H_
00022 
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/htmlparse/public/empty_html_filter.h"
00025 
00026 namespace net_instaweb {
00027 
00028 class RewriteDriver;
00029 class HtmlElement;
00030 class Statistics;
00031 
00034 class DetectReflowJsDeferFilter : public EmptyHtmlFilter {
00035  public:
00036   explicit DetectReflowJsDeferFilter(RewriteDriver* driver);
00037   virtual ~DetectReflowJsDeferFilter();
00038 
00039   virtual void StartDocument();
00040   virtual void StartElement(HtmlElement* element);
00041   virtual void EndElement(HtmlElement* element);
00042   virtual void EndDocument();
00043   virtual const char* Name() const { return "DetectReflowJsDeferFilter"; }
00044 
00045   void InsertDetectReflowCode(HtmlElement* element);
00046 
00047   static void InitStats(Statistics* statistics);
00048   static void Terminate();
00049 
00050  private:
00051   RewriteDriver* rewrite_driver_;
00052 
00054   bool script_written_;
00055   bool defer_js_enabled_;
00056   bool debug_;
00057 
00058   DISALLOW_COPY_AND_ASSIGN(DetectReflowJsDeferFilter);
00059 };
00060 
00061 }  
00062 
00063 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_DETECT_REFLOW_JS_DEFER_FILTER_H_
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