src/net/instaweb/rewriter/public/img_tag_scanner.h

/**
 * 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.
 */

// Author: jmaessen@google.com (Jan Maessen)

#ifndef NET_INSTAWEB_REWRITER_PUBLIC_IMG_TAG_SCANNER_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_IMG_TAG_SCANNER_H_

#include "base/basictypes.h"
#include "net/instaweb/htmlparse/public/html_element.h"
#include "net/instaweb/util/public/atom.h"

namespace net_instaweb {
class HtmlParse;

class ImgTagScanner {
 public:
  explicit ImgTagScanner(HtmlParse* html_parse);

  // Examine HTML element and determine if it is an img with a src.  If so
  // extract the src attribute and return it, otherwise return NULL.
  HtmlElement::Attribute* ParseImgElement(HtmlElement* element) {
    if (element->tag() == s_img_) {
      return element->FindAttribute(s_src_);
    }
    return NULL;
  }

 private:
  const Atom s_img_;
  const Atom s_src_;

  DISALLOW_COPY_AND_ASSIGN(ImgTagScanner);
};

}  // namespace net_instaweb

#endif  // NET_INSTAWEB_REWRITER_PUBLIC_IMG_TAG_SCANNER_H_