Page Speed Optimization Libraries  1.4.26.1
net/instaweb/rewriter/public/css_summarizer_base.h
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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_CSS_SUMMARIZER_BASE_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_SUMMARIZER_BASE_H_
00021 
00022 #include <vector>
00023 
00024 #include "net/instaweb/htmlparse/public/html_element.h"
00025 #include "net/instaweb/rewriter/public/resource_slot.h"
00026 #include "net/instaweb/rewriter/public/rewrite_filter.h"
00027 #include "net/instaweb/util/public/basictypes.h"
00028 #include "net/instaweb/util/public/scoped_ptr.h"
00029 #include "net/instaweb/util/public/string.h"
00030 #include "net/instaweb/util/public/string_util.h"
00031 
00032 namespace Css {
00033 
00034 class Stylesheet;
00035 
00036 }  
00037 
00038 namespace net_instaweb {
00039 
00040 class AbstractMutex;
00041 class HtmlCharactersNode;
00042 class HtmlNode;
00043 class RewriteContext;
00044 class RewriteDriver;
00045 
00050 class CssSummarizerBase : public RewriteFilter {
00051  public:
00052   explicit CssSummarizerBase(RewriteDriver* driver);
00053   virtual ~CssSummarizerBase();
00054 
00055  protected:
00056   enum SummaryState {
00058     kSummaryOk,
00059 
00061     kSummaryStillPending,
00062 
00064     kSummaryCssParseError,
00065 
00068     kSummaryResourceCreationFailed,
00069 
00071     kSummaryInputUnavailable
00072   };
00073 
00074   struct SummaryInfo {
00075     SummaryInfo() : state(kSummaryStillPending) {}
00076 
00079     GoogleString data;
00080 
00082     SummaryState state;
00083 
00086     GoogleString location;
00087   };
00088 
00091   virtual GoogleString CacheKeySuffix() const;
00092 
00100   virtual void Summarize(Css::Stylesheet* stylesheet,
00101                          GoogleString* out) const = 0;
00102 
00110   virtual void SummariesDone() = 0;
00111 
00118   void InjectSummaryData(HtmlNode* data);
00119 
00124   int NumStyles() const { return static_cast<int>(summaries_.size()); }
00125 
00131   const SummaryInfo& GetSummaryForStyle(int pos) const {
00132     return summaries_.at(pos);
00133   }
00134 
00141   virtual void NotifyInlineCss(HtmlElement* style_element,
00142                                HtmlCharactersNode* content);
00143   virtual void NotifyExternalCss(HtmlElement* link);
00144 
00147   virtual void StartDocumentImpl();
00148   virtual void EndDocument();
00149   virtual void StartElementImpl(HtmlElement* element);
00150   virtual void Characters(HtmlCharactersNode* characters);
00151   virtual void EndElementImpl(HtmlElement* element);
00152 
00153   virtual RewriteContext* MakeRewriteContext();
00154 
00155  private:
00156   class Context;
00157 
00159   void Clear();
00160 
00163   void ReportSummariesDone();
00164 
00166   void StartInlineRewrite(HtmlCharactersNode* text);
00167 
00170   void StartExternalRewrite(HtmlElement* link, HtmlElement::Attribute* src);
00171 
00177   Context* CreateContextForSlot(const ResourceSlotPtr& slot,
00178                                 const GoogleString& location);
00179 
00180   ResourceSlot* MakeSlotForInlineCss(const StringPiece& content);
00181 
00183   std::vector<SummaryInfo> summaries_;
00184 
00185   scoped_ptr<AbstractMutex> progress_lock_;
00186   int outstanding_rewrites_; 
00187   bool saw_end_of_document_; 
00188 
00189   HtmlElement* style_element_; 
00190   HtmlElement* injection_point_; 
00191 
00192   DISALLOW_COPY_AND_ASSIGN(CssSummarizerBase);
00193 };
00194 
00195 }  
00196 
00197 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_SUMMARIZER_BASE_H_
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