Page Speed Optimization Libraries
1.5.27.2
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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/public/css_tag_scanner.h" 00038 #include "net/instaweb/util/public/basictypes.h" 00039 #include "net/instaweb/util/public/string.h" 00040 00041 namespace net_instaweb { 00042 00043 class CriticalCssFinder; 00044 class CriticalCssResult; 00045 class CriticalCssResult_LinkRules; 00046 class HtmlCharactersNode; 00047 class HtmlElement; 00048 class RewriteDriver; 00049 00050 class CriticalCssFilter : public EmptyHtmlFilter { 00051 public: 00052 explicit CriticalCssFilter(RewriteDriver* rewrite_driver, 00053 CriticalCssFinder* finder); 00054 virtual ~CriticalCssFilter(); 00055 00056 static const char kAddStylesScript[]; 00057 static const char kStatsScriptTemplate[]; 00058 static const char kMoveAndApplyLinkScriptTemplate[]; 00059 static const char kMoveAndApplyLinkTagTemplate[]; 00060 static const char kNoscriptStylesId[]; 00061 static const char kMoveScriptId[]; 00062 00064 virtual void DetermineEnabled(); 00065 virtual void StartDocument(); 00066 virtual void EndDocument(); 00067 virtual void StartElement(HtmlElement* element); 00068 virtual void EndElement(HtmlElement* element); 00069 virtual void Characters(HtmlCharactersNode* characters); 00070 00071 virtual const char* Name() const { return "CriticalCss"; } 00072 00073 private: 00075 GoogleString DecodeUrl(const GoogleString& url); 00076 00080 const CriticalCssResult_LinkRules* GetLinkRules( 00081 const GoogleString& decoded_url); 00082 00085 void LogRewrite(int status); 00086 00087 RewriteDriver* driver_; 00088 CssTagScanner css_tag_scanner_; 00089 CriticalCssFinder* finder_; 00090 00091 CriticalCssResult* critical_css_result_; 00092 HtmlElement* noscript_element_; 00093 00095 typedef std::map<GoogleString, int> UrlIndexes; 00096 UrlIndexes url_indexes_; 00097 00098 bool has_critical_css_; 00099 bool is_move_link_script_added_; 00100 00101 class CssElement; 00102 class CssStyleElement; 00103 typedef std::vector<CssElement*> CssElementVector; 00104 CssElementVector css_elements_; 00105 CssStyleElement* current_style_element_; 00106 00111 int total_critical_size_; 00112 int total_original_size_; 00113 int repeated_style_blocks_size_; 00114 int num_repeated_style_blocks_; 00115 int num_links_; 00116 int num_replaced_links_; 00117 00118 DISALLOW_COPY_AND_ASSIGN(CriticalCssFilter); 00119 }; 00120 00121 } 00122 00123 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FILTER_H_