Page Speed Optimization Libraries
1.4.26.1
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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 00024 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_SELECTOR_FILTER_H_ 00025 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_SELECTOR_FILTER_H_ 00026 00027 #include <vector> 00028 00029 #include "net/instaweb/rewriter/public/css_summarizer_base.h" 00030 #include "net/instaweb/util/public/basictypes.h" 00031 #include "net/instaweb/util/public/scoped_ptr.h" 00032 #include "net/instaweb/util/public/string.h" 00033 #include "net/instaweb/util/public/string_util.h" 00034 00035 namespace Css { 00036 00037 class Stylesheet; 00038 00039 } 00040 00041 namespace net_instaweb { 00042 00043 class CriticalSelectorSummarizedCss; 00044 class HtmlCharactersNode; 00045 class HtmlElement; 00046 class RewriteDriver; 00047 00048 class CriticalSelectorFilter : public CssSummarizerBase { 00049 public: 00050 static const char kAddStylesScript[]; 00051 static const char kSummarizedCssProperty[]; 00052 00053 explicit CriticalSelectorFilter(RewriteDriver* rewrite_driver); 00054 virtual ~CriticalSelectorFilter(); 00055 00056 virtual const char* Name() const { return "CriticalSelectorFilter"; } 00057 virtual const char* id() const { return "cl"; } 00058 00059 protected: 00063 virtual void Summarize(Css::Stylesheet* stylesheet, 00064 GoogleString* out) const; 00065 virtual void SummariesDone(); 00066 00069 virtual GoogleString CacheKeySuffix() const; 00070 00073 virtual void NotifyInlineCss(HtmlElement* style_element, 00074 HtmlCharactersNode* content); 00075 virtual void NotifyExternalCss(HtmlElement* link); 00076 00078 virtual void StartDocumentImpl(); 00079 virtual void EndDocument(); 00080 virtual void EndElementImpl(HtmlElement* element); 00081 00082 private: 00083 class CssElement; 00084 class CssStyleElement; 00085 typedef std::vector<CssElement*> CssElementVector; 00086 00088 void InsertCriticalCssIfNeeded(HtmlElement* insert_before); 00089 00092 scoped_ptr<CriticalSelectorSummarizedCss> critical_css_; 00093 00097 StringSet critical_selectors_; 00098 00100 GoogleString cache_key_suffix_; 00101 00103 CssElementVector css_elements_; 00104 00106 HtmlElement* style_element_to_delete_; 00107 00109 bool inserted_critical_css_; 00110 00111 DISALLOW_COPY_AND_ASSIGN(CriticalSelectorFilter); 00112 }; 00113 00114 } 00115 00116 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_SELECTOR_FILTER_H_