Page Speed Optimization Libraries
1.8.31.3
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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/http/public/user_agent_matcher.h" 00023 #include "net/instaweb/rewriter/public/common_filter.h" 00024 #include "net/instaweb/rewriter/public/script_tag_scanner.h" 00025 #include "net/instaweb/util/public/basictypes.h" 00026 #include "net/instaweb/util/public/string.h" 00027 00028 namespace net_instaweb { 00029 00030 class HtmlElement; 00031 class RewriteDriver; 00032 00040 class JsDisableFilter : public CommonFilter { 00041 public: 00042 explicit JsDisableFilter(RewriteDriver* driver); 00043 ~JsDisableFilter(); 00044 00045 static const char kEnableJsExperimental[]; 00046 static const char kElementOnloadCode[]; 00047 00048 virtual void DetermineEnabled(); 00049 00050 virtual const char* Name() const { 00051 return "JsDisableFilter"; 00052 } 00053 00054 private: 00055 virtual void StartDocumentImpl(); 00056 00057 virtual void StartElementImpl(HtmlElement* element); 00058 00059 virtual void EndElementImpl(HtmlElement* element); 00060 00061 virtual void EndDocument(); 00062 00064 void InsertJsDeferExperimentalScript(); 00065 00069 void InsertMetaTagForIE(HtmlElement* element); 00070 00071 ScriptTagScanner script_tag_scanner_; 00072 int index_; 00073 bool ie_meta_tag_written_; 00074 int prefetch_js_elements_count_; 00075 int max_prefetch_js_elements_; 00076 GoogleString prefetch_js_elements_; 00077 bool should_look_for_prefetch_js_elements_; 00078 UserAgentMatcher::PrefetchMechanism prefetch_mechanism_; 00079 00080 DISALLOW_COPY_AND_ASSIGN(JsDisableFilter); 00081 }; 00082 00083 } 00084 00085 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_