Page Speed Optimization Libraries
1.3.25.1
|
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 <vector> 00034 00035 #include "net/instaweb/htmlparse/public/empty_html_filter.h" 00036 #include "net/instaweb/rewriter/public/css_tag_scanner.h" 00037 #include "net/instaweb/util/public/basictypes.h" 00038 #include "net/instaweb/util/public/scoped_ptr.h" 00039 #include "net/instaweb/util/public/string_util.h" 00040 00041 namespace net_instaweb { 00042 00043 class CriticalCssFinder; 00044 class HtmlCharactersNode; 00045 class HtmlElement; 00046 class RewriteDriver; 00047 00048 class CriticalCssFilter : public EmptyHtmlFilter { 00049 public: 00050 explicit CriticalCssFilter(RewriteDriver* rewrite_driver, 00051 CriticalCssFinder* finder); 00052 virtual ~CriticalCssFilter(); 00053 00055 virtual void StartDocument(); 00056 virtual void EndDocument(); 00057 virtual void StartElement(HtmlElement* element); 00058 virtual void Characters(HtmlCharactersNode* characters); 00059 virtual void EndElement(HtmlElement* element); 00060 virtual const char* Name() const { return "CriticalCss"; } 00061 00062 private: 00067 StringPiece GetRules(StringPiece decoded_url) const; 00068 00069 RewriteDriver* driver_; 00070 CssTagScanner css_tag_scanner_; 00071 CriticalCssFinder* finder_; 00072 00074 scoped_ptr<StringStringMap> critical_css_map_; 00075 00076 class CssElement; 00077 class CssStyleElement; 00078 typedef std::vector<CssElement*> CssElementVector; 00079 CssElementVector css_elements_; 00080 CssStyleElement* current_style_element_; 00081 bool has_critical_css_match_; 00082 00083 DISALLOW_COPY_AND_ASSIGN(CriticalCssFilter); 00084 }; 00085 00086 } 00087 00088 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FILTER_H_