Page Speed Optimization Libraries
1.8.31.2
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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 00021 00022 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_INSERT_GA_FILTER_H_ 00023 #define NET_INSTAWEB_REWRITER_PUBLIC_INSERT_GA_FILTER_H_ 00024 00025 #include "net/instaweb/rewriter/public/common_filter.h" 00026 #include "net/instaweb/util/public/basictypes.h" 00027 #include "net/instaweb/util/public/string.h" 00028 00029 namespace net_instaweb { 00030 00031 class HtmlCharactersNode; 00032 class HtmlElement; 00033 class RewriteDriver; 00034 class Statistics; 00035 class Variable; 00036 00037 extern const char kGAExperimentSnippet[]; 00038 extern const char kGAJsSnippet[]; 00039 extern const char kGASpeedTracking[]; 00040 00043 class InsertGAFilter : public CommonFilter { 00044 public: 00045 explicit InsertGAFilter(RewriteDriver* rewrite_driver); 00046 virtual ~InsertGAFilter(); 00047 00049 static void InitStats(Statistics* stats); 00050 00051 virtual void StartDocumentImpl(); 00052 virtual void StartElementImpl(HtmlElement* element); 00053 virtual void EndElementImpl(HtmlElement* element); 00055 virtual void Characters(HtmlCharactersNode* characters); 00056 00057 virtual const char* Name() const { return "InsertGASnippet"; } 00058 00059 private: 00061 GoogleString ConstructExperimentSnippet() const; 00062 00064 GoogleString MakeFullExperimentSnippet() const; 00065 00067 void HandleEndBody(HtmlElement* body); 00068 00071 void AddScriptNode(HtmlElement* current_element, GoogleString text, 00072 bool insert_immediately_after_current); 00073 00076 void HandleEndScript(HtmlElement* script); 00077 00080 bool FoundSnippetInBuffer() const; 00081 00083 Variable* inserted_ga_snippets_count_; 00084 00087 HtmlElement* script_element_; 00089 bool added_analytics_js_; 00091 bool added_experiment_snippet_; 00092 00094 GoogleString ga_id_; 00095 00098 GoogleString buffer_; 00099 00101 bool found_snippet_; 00102 00104 bool increase_speed_tracking_; 00105 00106 DISALLOW_COPY_AND_ASSIGN(InsertGAFilter); 00107 }; 00108 00109 } 00110 00111 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_INSERT_GA_FILTER_H_