url_left_trim_filter.h

Go to the documentation of this file.

/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef NET_INSTAWEB_REWRITER_PUBLIC_URL_LEFT_TRIM_FILTER_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_URL_LEFT_TRIM_FILTER_H_

#include "net/instaweb/rewriter/public/common_filter.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/html/html_element.h"

namespace net_instaweb {
class GoogleUrl;
class MessageHandler;
class RewriteDriver;
class Statistics;
class Variable;

class UrlLeftTrimFilter : public CommonFilter {
 public:
  UrlLeftTrimFilter(RewriteDriver* rewrite_driver, Statistics* stats);
  virtual ~UrlLeftTrimFilter();

  static void InitStats(Statistics* statistics);
  virtual void StartDocumentImpl() {}
  virtual void StartElementImpl(HtmlElement* element);
  virtual void EndElementImpl(HtmlElement* element) {}

  virtual const char* Name() const { return "UrlLeftTrim"; }

  static bool Trim(const GoogleUrl& base_url, const StringPiece& url_to_trim,
                   GoogleString* trimmed_url, MessageHandler* handler);

 private:
  void TrimAttribute(HtmlElement::Attribute* attr);
  void ClearBaseUrl();

  friend class UrlLeftTrimFilterTest;

  Variable* trim_count_;
  Variable* trim_saved_bytes_;

  
};

}  

#endif