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css_combine_filter.h
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1 /*
2  * Copyright 2010 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_CSS_COMBINE_FILTER_H_
20 #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_COMBINE_FILTER_H_
21 
25 #include "pagespeed/kernel/base/basictypes.h"
26 #include "pagespeed/kernel/base/scoped_ptr.h"
27 #include "pagespeed/kernel/base/string_util.h"
28 #include "pagespeed/kernel/util/url_multipart_encoder.h"
29 
30 namespace net_instaweb {
31 
32 class HtmlElement;
33 class HtmlIEDirectiveNode;
34 class RewriteContext;
35 class RewriteDriver;
36 class Statistics;
37 class UrlSegmentEncoder;
38 class Variable;
39 
41  public:
45  static const char kCssCombineOpportunities[];
47  static const char kCssFileCountReduction[];
48 
49  explicit CssCombineFilter(RewriteDriver* rewrite_driver);
50  virtual ~CssCombineFilter();
51 
52  static void InitStats(Statistics* statistics);
53 
54  virtual void StartDocumentImpl();
55  virtual void EndDocument();
56  virtual void StartElementImpl(HtmlElement* element);
57  virtual void EndElementImpl(HtmlElement* element) {}
58  virtual void Flush();
59  virtual void DetermineEnabled(GoogleString* disabled_reason);
60  virtual void IEDirective(HtmlIEDirectiveNode* directive);
61  virtual const char* Name() const { return "CssCombine"; }
62  virtual const UrlSegmentEncoder* encoder() const {
63  return &multipart_encoder_;
64  }
65 
67  virtual const char* id() const { return RewriteOptions::kCssCombinerId; }
68 
69  private:
70  class Context;
71  class CssCombiner;
72 
73  CssCombiner* combiner();
74  void NextCombination(StringPiece debug_help);
75  Context* MakeContext();
76 
77  CssTagScanner css_tag_scanner_;
78  scoped_ptr<Context> context_;
79  UrlMultipartEncoder multipart_encoder_;
80  bool end_document_found_;
81  int css_links_;
82 
83  Variable* css_combine_opportunities_;
84 
85  DISALLOW_COPY_AND_ASSIGN(CssCombineFilter);
86 };
87 
88 }
89 
90 #endif
virtual void DetermineEnabled(GoogleString *disabled_reason)
virtual RewriteContext * MakeRewriteContext()
static const char kCssCombineOpportunities[]
Definition: css_combine_filter.h:45
virtual const UrlSegmentEncoder * encoder() const
Definition: css_combine_filter.h:62
static const char kCssFileCountReduction[]
CSS file reduction (Optimally this equals kCssCombineOpportunities).
Definition: css_combine_filter.h:47
Definition: rewrite_filter.h:37
Definition: rewrite_driver.h:98
Definition: rewrite_context.h:144
Definition: css_combine_filter.h:40