Page Speed Optimization Libraries  1.6.29.3
net/instaweb/rewriter/public/critical_css_filter.h
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00001 /*
00002  * Copyright 2013 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 
00029 
00030 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FILTER_H_
00031 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FILTER_H_
00032 
00033 #include <map>
00034 #include <vector>
00035 
00036 #include "net/instaweb/htmlparse/public/empty_html_filter.h"
00037 #include "net/instaweb/rewriter/critical_css.pb.h"
00038 #include "net/instaweb/rewriter/public/css_tag_scanner.h"
00039 #include "net/instaweb/util/public/basictypes.h"
00040 #include "net/instaweb/util/public/string.h"
00041 
00042 namespace net_instaweb {
00043 
00044 class CriticalCssFinder;
00045 class CriticalCssResult;
00046 class CriticalCssResult_LinkRules;
00047 class HtmlCharactersNode;
00048 class HtmlElement;
00049 class RewriteDriver;
00050 
00051 class CriticalCssFilter : public EmptyHtmlFilter {
00052  public:
00053   explicit CriticalCssFilter(RewriteDriver* rewrite_driver,
00054                              CriticalCssFinder* finder);
00055   virtual ~CriticalCssFilter();
00056 
00057   static const char kAddStylesScript[];
00058   static const char kStatsScriptTemplate[];
00059   static const char kNoscriptStylesId[];
00060   static const char kMoveScriptId[];
00061   static const char kApplyFlushEarlyCssTemplate[];
00062   static const char kInvokeFlushEarlyCssTemplate[];
00063 
00065   virtual void DetermineEnabled();
00066   virtual void StartDocument();
00067   virtual void EndDocument();
00068   virtual void StartElement(HtmlElement* element);
00069   virtual void EndElement(HtmlElement* element);
00070   virtual void Characters(HtmlCharactersNode* characters);
00071 
00072   virtual const char* Name() const { return "CriticalCss"; }
00073 
00074  private:
00076   GoogleString DecodeUrl(const GoogleString& url);
00077 
00081   const CriticalCssResult_LinkRules* GetLinkRules(
00082       const GoogleString& decoded_url);
00083 
00086   void LogRewrite(int status);
00087 
00088   RewriteDriver* driver_;
00089   CssTagScanner css_tag_scanner_;
00090   CriticalCssFinder* finder_;
00091 
00092   CriticalCssResult* critical_css_result_;
00093   HtmlElement* noscript_element_;
00094 
00096   typedef std::map<GoogleString, int> UrlIndexes;
00097   UrlIndexes url_indexes_;
00098 
00099   bool has_critical_css_;
00100   bool is_move_link_script_added_;
00101 
00102   class CssElement;
00103   class CssStyleElement;
00104   typedef std::vector<CssElement*> CssElementVector;
00105   CssElementVector css_elements_;
00106   CssStyleElement* current_style_element_;
00107 
00112   int total_critical_size_;
00113   int total_original_size_;
00114   int repeated_style_blocks_size_;
00115   int num_repeated_style_blocks_;
00116   int num_links_;
00117   int num_replaced_links_;
00118 
00119   DISALLOW_COPY_AND_ASSIGN(CriticalCssFilter);
00120 };
00121 
00122 }  
00123 
00124 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FILTER_H_
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