Page Speed Optimization Libraries  1.5.27.2
net/instaweb/rewriter/public/js_disable_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_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   static const char kElementOnloadCode[];
00048 
00049   virtual void StartDocument();
00050 
00051   virtual void StartElement(HtmlElement* element);
00052 
00053   virtual void EndElement(HtmlElement* element);
00054 
00055   virtual void EndDocument();
00056 
00057   virtual void DetermineEnabled();
00058 
00059   virtual const char* Name() const {
00060     return "JsDisableFilter";
00061   }
00062 
00063   static GoogleString GetJsDisableScriptSnippet(const RewriteOptions* options);
00064 
00065  private:
00067   void InsertJsDeferExperimentalScript(HtmlElement* element);
00068 
00072   void InsertMetaTagForIE(HtmlElement* element);
00073 
00074   RewriteDriver* rewrite_driver_;
00075   ScriptTagScanner script_tag_scanner_;
00076   int index_;
00077   bool defer_js_experimental_script_written_;
00078   bool ie_meta_tag_written_;
00079 
00080   DISALLOW_COPY_AND_ASSIGN(JsDisableFilter);
00081 };
00082 
00083 }  
00084 
00085 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_JS_DISABLE_FILTER_H_
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