Page Speed Optimization Libraries  1.6.29.3
net/instaweb/rewriter/public/add_instrumentation_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_ADD_INSTRUMENTATION_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_ADD_INSTRUMENTATION_FILTER_H_
00021 
00022 #include "net/instaweb/htmlparse/public/empty_html_filter.h"
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/util/public/string.h"
00025 
00026 namespace net_instaweb {
00027 
00028 class HtmlElement;
00029 class RewriteDriver;
00030 class Statistics;
00031 class Variable;
00032 
00034 class AddInstrumentationFilter : public EmptyHtmlFilter {
00035  public:
00036   static const char kLoadTag[];
00037   static const char kUnloadTag[];
00038   static GoogleString* kUnloadScriptFormatXhtml;
00039   static GoogleString* kTailScriptFormatXhtml;
00040 
00042   static const char kInstrumentationScriptAddedCount[];
00043 
00044   explicit AddInstrumentationFilter(RewriteDriver* driver);
00045   virtual ~AddInstrumentationFilter();
00046 
00047   static void InitStats(Statistics* statistics);
00048 
00049   virtual void StartDocument();
00050   virtual void StartElement(HtmlElement* element);
00051   virtual void EndElement(HtmlElement* element);
00052   virtual const char* Name() const { return "AddInstrumentation"; }
00053 
00054  protected:
00056   Variable* instrumentation_script_added_count_;
00057 
00058  private:
00061   void AddScriptNode(HtmlElement* element, const GoogleString& tag_name);
00062 
00065   void AddHeadScript(HtmlElement* element);
00066 
00067   RewriteDriver* driver_;
00068   bool found_head_;
00069   bool added_head_script_;
00070   bool added_tail_script_;
00071   bool added_unload_script_;
00072 
00073   DISALLOW_COPY_AND_ASSIGN(AddInstrumentationFilter);
00074 };
00075 
00076 }  
00077 
00078 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_ADD_INSTRUMENTATION_FILTER_H_
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