Page Speed Optimization Libraries  1.4.26.1
net/instaweb/rewriter/public/url_left_trim_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_URL_LEFT_TRIM_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_URL_LEFT_TRIM_FILTER_H_
00021 
00022 #include "net/instaweb/htmlparse/public/html_element.h"
00023 #include "net/instaweb/rewriter/public/common_filter.h"
00024 #include "net/instaweb/util/public/basictypes.h"
00025 #include "net/instaweb/util/public/string.h"
00026 #include "net/instaweb/util/public/string_util.h"
00027 
00028 namespace net_instaweb {
00029 class GoogleUrl;
00030 class MessageHandler;
00031 class RewriteDriver;
00032 class Statistics;
00033 class Variable;
00034 
00047 class UrlLeftTrimFilter : public CommonFilter {
00048  public:
00049   UrlLeftTrimFilter(RewriteDriver* rewrite_driver, Statistics* stats);
00050   virtual ~UrlLeftTrimFilter();
00051 
00052   static void InitStats(Statistics* statistics);
00053   virtual void StartDocumentImpl() {}
00054   virtual void StartElementImpl(HtmlElement* element);
00055   virtual void EndElementImpl(HtmlElement* element) {}
00056 
00057   virtual const char* Name() const { return "UrlLeftTrim"; }
00058 
00064   static bool Trim(const GoogleUrl& base_url, const StringPiece& url_to_trim,
00065                    GoogleString* trimmed_url, MessageHandler* handler);
00066 
00067  private:
00068   void TrimAttribute(HtmlElement::Attribute* attr);
00069   void ClearBaseUrl();
00070 
00071   friend class UrlLeftTrimFilterTest;
00072 
00074   Variable* trim_count_;
00075   Variable* trim_saved_bytes_;
00076 
00077   DISALLOW_COPY_AND_ASSIGN(UrlLeftTrimFilter);
00078 };
00079 
00080 }  
00081 
00082 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_URL_LEFT_TRIM_FILTER_H_
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