Page Speed Optimization Libraries  1.7.30.2
net/instaweb/rewriter/public/split_html_filter.h
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00001 /*
00002  * Copyright 2012 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_SPLIT_HTML_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_SPLIT_HTML_FILTER_H_
00021 
00022 #include <vector>
00023 
00024 #include "net/instaweb/rewriter/public/script_tag_scanner.h"
00025 #include "net/instaweb/rewriter/public/suppress_prehead_filter.h"
00026 #include "net/instaweb/util/public/basictypes.h"
00027 #include "net/instaweb/util/public/json.h"
00028 #include "net/instaweb/util/public/json_writer.h"
00029 #include "net/instaweb/util/public/null_writer.h"
00030 #include "net/instaweb/util/public/scoped_ptr.h"
00031 #include "net/instaweb/util/public/string.h"
00032 #include "net/instaweb/util/public/string_util.h"
00033 
00034 namespace net_instaweb {
00035 
00036 class HtmlElement;
00037 class RewriteDriver;
00038 class RewriteOptions;
00039 class SplitHtmlConfig;
00040 class SplitHtmlState;
00041 class StaticAssetManager;
00042 class Writer;
00043 
00046 
00049 class SplitHtmlFilter : public SuppressPreheadFilter {
00050  public:
00051   static const char kSplitSuffixJsFormatString[];
00052   static const char kSplitTwoChunkSuffixJsFormatString[];
00053   static const char kLoadHiResImages[];
00054   static const char kMetaReferer[];
00055 
00056   explicit SplitHtmlFilter(RewriteDriver* rewrite_driver);
00057   virtual ~SplitHtmlFilter();
00058 
00059   virtual void DetermineEnabled();
00060 
00061   virtual void StartDocument();
00062   virtual void EndDocument();
00063 
00064   virtual void StartElement(HtmlElement* element);
00065   virtual void EndElement(HtmlElement* element);
00066 
00067   static const GoogleString& GetBlinkJsUrl(
00068       const RewriteOptions* options,
00069       StaticAssetManager* static_asset_manager);
00070 
00071   virtual const char* Name() const { return "SplitHtmlFilter"; }
00072 
00073  private:
00074   void ServeNonCriticalPanelContents(const Json::Value& json);
00075 
00078   void MarkElementWithPanelId(HtmlElement* element,
00079                               const GoogleString& panel_id);
00080 
00082   GoogleString GetPanelIdForInstance(HtmlElement* element);
00083 
00085   GoogleString GenerateCriticalLineConfigString();
00086 
00089   void EndPanelInstance();
00090 
00092   void StartPanelInstance(HtmlElement* element);
00093 
00095   void InsertPanelStub(HtmlElement* element, const GoogleString& panel_id);
00096 
00098   void AppendJsonData(Json::Value* dictionary, const Json::Value& dict);
00099 
00100   void WriteString(const StringPiece& str);
00101 
00105   void InsertSplitInitScripts(HtmlElement* element);
00106 
00107   void InvokeBaseHtmlFilterStartDocument();
00108 
00109   void InvokeBaseHtmlFilterStartElement(HtmlElement* element);
00110 
00111   void InvokeBaseHtmlFilterEndElement(HtmlElement* element);
00112 
00113   void InvokeBaseHtmlFilterEndDocument();
00114 
00119   bool IsAllowedCrossDomainRequest(StringPiece cross_origin);
00120 
00121   RewriteDriver* rewrite_driver_;
00122   const SplitHtmlConfig* config_; 
00123   scoped_ptr<SplitHtmlState> state_;
00124   const RewriteOptions* options_;
00125   std::vector<ElementJsonPair> element_json_stack_;
00126   Json::FastWriter fast_writer_;
00127   scoped_ptr<JsonWriter> json_writer_;
00128   Writer* original_writer_;
00129   NullWriter null_writer_;
00130   StringPiece url_;
00131   bool script_written_;
00132   bool flush_head_enabled_;
00133   bool disable_filter_;
00134   bool inside_pagespeed_no_defer_script_;
00135   bool serve_response_in_two_chunks_;
00136   int last_script_index_before_panel_stub_;
00137   bool panel_seen_;
00138   StaticAssetManager* static_asset_manager_; 
00139   ScriptTagScanner script_tag_scanner_;
00140 
00141   DISALLOW_COPY_AND_ASSIGN(SplitHtmlFilter);
00142 };
00143 
00144 }  
00145 
00146 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_SPLIT_HTML_FILTER_H_
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