Page Speed Optimization Libraries
1.6.29.3
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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_