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critical_css_beacon_filter.h
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1 /*
2  * Copyright 2013 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http:///www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
18 
19 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_BEACON_FILTER_H_
20 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_BEACON_FILTER_H_
21 
22 #include "net/instaweb/http/public/semantic_type.h"
29 
30 namespace Css {
31 
32 class Ruleset;
33 class Stylesheet;
34 
35 }
36 
37 namespace net_instaweb {
38 
39 struct BeaconMetadata;
40 class HtmlElement;
41 class Statistics;
42 class Variable;
43 
50  public:
51  static const char kInitializePageSpeedJs[];
52 
54  static const char kCriticalCssBeaconAddedCount[];
55  static const char kCriticalCssNoBeaconDueToMissingData[];
56  static const char kCriticalCssSkippedDueToCharset[];
57 
58  explicit CriticalCssBeaconFilter(RewriteDriver* driver);
59  virtual ~CriticalCssBeaconFilter();
60 
61  static void InitStats(Statistics* statistics);
62 
63  virtual const char* Name() const { return "CriticalCssBeacon"; }
64  virtual const char* id() const { return "cb"; }
65 
71  const {
72  return driver()->options()->HasInlineUnauthorizedResourceType(
73  semantic_type::kStylesheet) ?
74  RewriteDriver::kInlineUnauthorizedResources :
75  RewriteDriver::kInlineOnlyAuthorizedResources;
76  }
77 
79  virtual bool IntendedForInlining() const { return true; }
80 
81  protected:
82  virtual bool MustSummarize(HtmlElement* element) const;
83  virtual void Summarize(Css::Stylesheet* stylesheet,
84  GoogleString* out) const;
85  virtual void SummariesDone();
86 
87  virtual void DetermineEnabled(GoogleString* disabled_reason);
88 
89  private:
90  static void FindSelectorsFromRuleset(const Css::Ruleset& ruleset,
91  StringSet* selectors);
93  static void FindSelectorsFromStylesheet(const Css::Stylesheet& css,
94  StringSet* selectors);
95 
97  void AppendSelectorsInitJs(GoogleString* script, const StringSet& selectors);
98 
100  void AppendBeaconInitJs(const BeaconMetadata& metadata, GoogleString* script);
101 
103  Variable* critical_css_beacon_added_count_;
106  Variable* critical_css_no_beacon_due_to_missing_data_;
109  Variable* critical_css_skipped_due_to_charset_;
110 
111  DISALLOW_COPY_AND_ASSIGN(CriticalCssBeaconFilter);
112 };
113 
114 }
115 
116 #endif
virtual bool MustSummarize(HtmlElement *element) const
virtual void DetermineEnabled(GoogleString *disabled_reason)
virtual void Summarize(Css::Stylesheet *stylesheet, GoogleString *out) const
virtual bool IntendedForInlining() const
Selectors are inlined into javascript.
Definition: critical_css_beacon_filter.h:79
virtual RewriteDriver::InlineAuthorizationPolicy AllowUnauthorizedDomain() const
Definition: critical_css_beacon_filter.h:70
Definition: critical_finder_support_util.h:78
Definition: critical_css_beacon_filter.h:49
Definition: rewrite_driver.h:98
static const char kCriticalCssBeaconAddedCount[]
Statistics:
Definition: critical_css_beacon_filter.h:54
InlineAuthorizationPolicy
See CreateInputResource.
Definition: rewrite_driver.h:135
const RewriteOptions * options() const
Return the options used for this RewriteDriver.
Definition: rewrite_driver.h:478
Definition: css_summarizer_base.h:52