Page Speed Optimization Libraries  1.3.25.1
net/instaweb/rewriter/public/compute_visible_text_filter.h
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00001 /*
00002  * Copyright 2012 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_COMPUTE_VISIBLE_TEXT_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_COMPUTE_VISIBLE_TEXT_FILTER_H_
00021 
00022 #include "net/instaweb/util/public/string_writer.h"
00023 #include "net/instaweb/htmlparse/public/html_writer_filter.h"
00024 #include "net/instaweb/util/public/basictypes.h"
00025 #include "net/instaweb/util/public/string.h"
00026 
00027 namespace net_instaweb {
00028 
00029 class HtmlCdataNode;
00030 class HtmlCharactersNode;
00031 class HtmlCommentNode;
00032 class HtmlDirectiveNode;
00033 class HtmlElement;
00034 class HtmlIEDirectiveNode;
00035 class RewriteDriver;
00036 
00046 class ComputeVisibleTextFilter : public HtmlWriterFilter {
00047  public:
00048   explicit ComputeVisibleTextFilter(RewriteDriver* rewrite_driver);
00049   virtual ~ComputeVisibleTextFilter();
00050 
00051   virtual void StartDocument();
00052   virtual void StartElement(HtmlElement* element);
00053   virtual void EndElement(HtmlElement* element);
00054   virtual void Cdata(HtmlCdataNode* cdata);
00055   virtual void Characters(HtmlCharactersNode* characters);
00056   virtual void Comment(HtmlCommentNode* comment);
00057   virtual void IEDirective(HtmlIEDirectiveNode* directive);
00058   virtual void Directive(HtmlDirectiveNode* directive);
00059   virtual void EndDocument();
00060   virtual const char* Name() const { return "ComputeVisibleTextFilter"; }
00061 
00062  private:
00063   RewriteDriver* rewrite_driver_;
00064   StringWriter writer_;
00065   GoogleString buffer_;
00066 
00067   DISALLOW_COPY_AND_ASSIGN(ComputeVisibleTextFilter);
00068 };
00069 
00070 }  
00071 
00072 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_COMPUTE_VISIBLE_TEXT_FILTER_H_
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