Page Speed Optimization Libraries
1.7.30.1
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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 00018 00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_BEACON_FILTER_H_ 00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_BEACON_FILTER_H_ 00021 00022 #include "net/instaweb/rewriter/public/css_summarizer_base.h" 00023 #include "net/instaweb/util/public/basictypes.h" 00024 #include "net/instaweb/util/public/string.h" 00025 #include "net/instaweb/util/public/string_util.h" 00026 00027 namespace Css { 00028 00029 class Ruleset; 00030 class Stylesheet; 00031 00032 } 00033 00034 namespace net_instaweb { 00035 00036 struct BeaconMetadata; 00037 class HtmlElement; 00038 class RewriteDriver; 00039 class Statistics; 00040 class Variable; 00041 00047 class CriticalCssBeaconFilter : public CssSummarizerBase { 00048 public: 00049 static const char kInitializePageSpeedJs[]; 00050 00052 static const char kCriticalCssBeaconAddedCount[]; 00053 static const char kCriticalCssNoBeaconDueToMissingData[]; 00054 static const char kCriticalCssSkippedDueToCharset[]; 00055 00056 explicit CriticalCssBeaconFilter(RewriteDriver* driver); 00057 virtual ~CriticalCssBeaconFilter(); 00058 00059 static void InitStats(Statistics* statistics); 00060 00061 virtual const char* Name() const { return "CriticalCssBeacon"; } 00062 virtual const char* id() const { return "cb"; } 00063 00064 protected: 00065 virtual bool MustSummarize(HtmlElement* element) const; 00066 virtual void Summarize(Css::Stylesheet* stylesheet, 00067 GoogleString* out) const; 00068 virtual void SummariesDone(); 00069 00070 virtual void DetermineEnabled(); 00071 00072 private: 00073 static void FindSelectorsFromRuleset(const Css::Ruleset& ruleset, 00074 StringSet* selectors); 00076 static void FindSelectorsFromStylesheet(const Css::Stylesheet& css, 00077 StringSet* selectors); 00078 00080 void AppendSelectorsInitJs(GoogleString* script, const StringSet& selectors); 00081 00083 void AppendBeaconInitJs(const BeaconMetadata& metadata, GoogleString* script); 00084 00086 Variable* critical_css_beacon_added_count_; 00089 Variable* critical_css_no_beacon_due_to_missing_data_; 00092 Variable* critical_css_skipped_due_to_charset_; 00093 00094 DISALLOW_COPY_AND_ASSIGN(CriticalCssBeaconFilter); 00095 }; 00096 00097 } 00098 00099 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_BEACON_FILTER_H_