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/rewriter/public/resource_tag_scanner.h" 00025 #include "net/instaweb/util/public/basictypes.h" 00026 #include "net/instaweb/util/public/string.h" 00027 #include "net/instaweb/util/public/string_util.h" 00028 00029 namespace net_instaweb { 00030 class GoogleUrl; 00031 class MessageHandler; 00032 class RewriteDriver; 00033 class Statistics; 00034 class Variable; 00035 00048 class UrlLeftTrimFilter : public CommonFilter { 00049 public: 00050 UrlLeftTrimFilter(RewriteDriver* rewrite_driver, Statistics* stats); 00051 virtual ~UrlLeftTrimFilter(); 00052 00053 static void Initialize(Statistics* statistics); 00054 virtual void StartDocumentImpl() {} 00055 virtual void StartElementImpl(HtmlElement* element); 00056 virtual void EndElementImpl(HtmlElement* element) {} 00057 00058 virtual const char* Name() const { return "UrlLeftTrim"; } 00059 00065 static bool Trim(const GoogleUrl& base_url, const StringPiece& url_to_trim, 00066 GoogleString* trimmed_url, MessageHandler* handler); 00067 00068 private: 00069 void TrimAttribute(HtmlElement::Attribute* attr); 00070 void ClearBaseUrl(); 00071 00072 friend class UrlLeftTrimFilterTest; 00073 00074 ResourceTagScanner tag_scanner_; 00076 Variable* trim_count_; 00077 Variable* trim_saved_bytes_; 00078 00079 DISALLOW_COPY_AND_ASSIGN(UrlLeftTrimFilter); 00080 }; 00081 00082 } 00083 00084 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_URL_LEFT_TRIM_FILTER_H_