Page Speed Optimization Libraries
1.2.24.1
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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_JS_DISABLE_FILTER_H_ 00020 #define NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_ 00021 00022 #include "net/instaweb/htmlparse/public/empty_html_filter.h" 00023 #include "net/instaweb/rewriter/public/script_tag_scanner.h" 00024 #include "net/instaweb/util/public/basictypes.h" 00025 #include "net/instaweb/util/public/string.h" 00026 00027 namespace net_instaweb { 00028 00029 class HtmlElement; 00030 class RewriteDriver; 00031 class RewriteOptions; 00032 00040 class JsDisableFilter : public EmptyHtmlFilter { 00041 public: 00042 explicit JsDisableFilter(RewriteDriver* driver); 00043 ~JsDisableFilter(); 00044 00045 static const char kEnableJsExperimental[]; 00046 static const char kDisableJsExperimental[]; 00047 00048 virtual void StartDocument(); 00049 00050 virtual void StartElement(HtmlElement* element); 00051 00052 virtual void EndElement(HtmlElement* element); 00053 00054 virtual void EndDocument(); 00055 00056 virtual void DetermineEnabled(); 00057 00058 virtual const char* Name() const { 00059 return "JsDisableFilter"; 00060 } 00061 00062 static GoogleString GetJsDisableScriptSnippet(const RewriteOptions* options); 00063 00064 private: 00066 void InsertJsDeferExperimentalScript(HtmlElement* element); 00067 00071 void InsertMetaTagForIE(HtmlElement* element); 00072 00073 RewriteDriver* rewrite_driver_; 00074 ScriptTagScanner script_tag_scanner_; 00075 int index_; 00076 bool defer_js_experimental_script_written_; 00077 00078 DISALLOW_COPY_AND_ASSIGN(JsDisableFilter); 00079 }; 00080 00081 } 00082 00083 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_