Page Speed Optimization Libraries  1.7.30.2
net/instaweb/rewriter/public/css_move_to_head_filter.h
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00001 /*
00002  * Copyright 2010 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_MOVE_TO_HEAD_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CSS_MOVE_TO_HEAD_FILTER_H_
00021 
00022 #include "net/instaweb/rewriter/public/common_filter.h"
00023 #include "net/instaweb/rewriter/public/css_tag_scanner.h"
00024 #include "net/instaweb/util/public/basictypes.h"
00025 
00026 namespace net_instaweb {
00027 
00028 class HtmlElement;
00029 class RewriteDriver;
00030 class Statistics;
00031 class Variable;
00032 
00035 class CssMoveToHeadFilter : public CommonFilter {
00036  public:
00037   explicit CssMoveToHeadFilter(RewriteDriver* driver);
00038   virtual ~CssMoveToHeadFilter();
00039 
00040   static void InitStats(Statistics* statistics);
00041 
00042   virtual void StartDocumentImpl();
00043   virtual void StartElementImpl(HtmlElement* element) {}
00044   virtual void EndElementImpl(HtmlElement* element);
00045 
00046   virtual const char* Name() const { return "CssMoveToHead"; }
00047   virtual void DetermineEnabled();
00048 
00049  private:
00050   CssTagScanner css_tag_scanner_;
00051 
00053   bool move_css_to_head_;
00056   bool move_css_above_scripts_;
00057 
00058   HtmlElement* move_to_element_;
00059   bool element_is_head_;
00060 
00061   Variable* css_elements_moved_;
00062 
00063   DISALLOW_COPY_AND_ASSIGN(CssMoveToHeadFilter);
00064 };
00065 
00066 }  
00067 
00068 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CSS_MOVE_TO_HEAD_FILTER_H_
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