Page Speed Optimization Libraries
1.7.30.1
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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/rewriter/public/common_filter.h" 00023 #include "net/instaweb/util/public/basictypes.h" 00024 #include "net/instaweb/util/public/string.h" 00025 #include "pagespeed/kernel/base/string_util.h" 00026 00027 namespace net_instaweb { 00028 00029 class HtmlElement; 00030 class RewriteDriver; 00031 class Statistics; 00032 class Variable; 00033 00035 class AddInstrumentationFilter : public CommonFilter { 00036 public: 00037 static const char kLoadTag[]; 00038 static const char kUnloadTag[]; 00039 static GoogleString* kUnloadScriptFormatXhtml; 00040 static GoogleString* kTailScriptFormatXhtml; 00041 00043 static const char kInstrumentationScriptAddedCount[]; 00044 00045 explicit AddInstrumentationFilter(RewriteDriver* driver); 00046 virtual ~AddInstrumentationFilter(); 00047 00048 static void InitStats(Statistics* statistics); 00049 00050 virtual void StartDocumentImpl(); 00051 virtual void EndDocument(); 00052 virtual void StartElementImpl(HtmlElement* element); 00053 virtual void EndElementImpl(HtmlElement* element); 00054 virtual const char* Name() const { return "AddInstrumentation"; } 00055 00056 protected: 00058 Variable* instrumentation_script_added_count_; 00059 00060 private: 00062 GoogleString GetScriptJs(StringPiece event); 00063 00066 void AddHeadScript(HtmlElement* element); 00067 00068 bool found_head_; 00069 bool added_head_script_; 00070 bool added_unload_script_; 00071 00072 DISALLOW_COPY_AND_ASSIGN(AddInstrumentationFilter); 00073 }; 00074 00075 } 00076 00077 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_ADD_INSTRUMENTATION_FILTER_H_