Page Speed Optimization Libraries
1.8.31.3
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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/http/public/semantic_type.h" 00023 #include "net/instaweb/rewriter/public/css_summarizer_base.h" 00024 #include "net/instaweb/rewriter/public/rewrite_driver.h" 00025 #include "net/instaweb/rewriter/public/rewrite_options.h" 00026 #include "net/instaweb/util/public/basictypes.h" 00027 #include "net/instaweb/util/public/string.h" 00028 #include "net/instaweb/util/public/string_util.h" 00029 00030 namespace Css { 00031 00032 class Ruleset; 00033 class Stylesheet; 00034 00035 } 00036 00037 namespace net_instaweb { 00038 00039 struct BeaconMetadata; 00040 class HtmlElement; 00041 class Statistics; 00042 class Variable; 00043 00049 class CriticalCssBeaconFilter : public CssSummarizerBase { 00050 public: 00051 static const char kInitializePageSpeedJs[]; 00052 00054 static const char kCriticalCssBeaconAddedCount[]; 00055 static const char kCriticalCssNoBeaconDueToMissingData[]; 00056 static const char kCriticalCssSkippedDueToCharset[]; 00057 00058 explicit CriticalCssBeaconFilter(RewriteDriver* driver); 00059 virtual ~CriticalCssBeaconFilter(); 00060 00061 static void InitStats(Statistics* statistics); 00062 00063 virtual const char* Name() const { return "CriticalCssBeacon"; } 00064 virtual const char* id() const { return "cb"; } 00065 00070 virtual RewriteDriver::InlineAuthorizationPolicy AllowUnauthorizedDomain() 00071 const { 00072 return driver()->options()->HasInlineUnauthorizedResourceType( 00073 semantic_type::kStylesheet) ? 00074 RewriteDriver::kInlineUnauthorizedResources : 00075 RewriteDriver::kInlineOnlyAuthorizedResources; 00076 } 00077 00079 virtual bool IntendedForInlining() const { return true; } 00080 00081 protected: 00082 virtual bool MustSummarize(HtmlElement* element) const; 00083 virtual void Summarize(Css::Stylesheet* stylesheet, 00084 GoogleString* out) const; 00085 virtual void SummariesDone(); 00086 00087 virtual void DetermineEnabled(); 00088 00089 private: 00090 static void FindSelectorsFromRuleset(const Css::Ruleset& ruleset, 00091 StringSet* selectors); 00093 static void FindSelectorsFromStylesheet(const Css::Stylesheet& css, 00094 StringSet* selectors); 00095 00097 void AppendSelectorsInitJs(GoogleString* script, const StringSet& selectors); 00098 00100 void AppendBeaconInitJs(const BeaconMetadata& metadata, GoogleString* script); 00101 00103 Variable* critical_css_beacon_added_count_; 00106 Variable* critical_css_no_beacon_due_to_missing_data_; 00109 Variable* critical_css_skipped_due_to_charset_; 00110 00111 DISALLOW_COPY_AND_ASSIGN(CriticalCssBeaconFilter); 00112 }; 00113 00114 } 00115 00116 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_BEACON_FILTER_H_