/*
 * Copyright 2012 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: jmarantz@google.com (Joshua Marantz)

#include "public/base_tag_filter.h"

#include "net/instaweb/rewriter/public/rewrite_driver.h"
#include "pagespeed/kernel/html/html_element.h"
#include "pagespeed/kernel/html/html_name.h"

namespace net_instaweb {

BaseTagFilter::~BaseTagFilter() {}

void BaseTagFilter::StartElement(HtmlElement* element) {
  if ((element->keyword() == HtmlName::kHead) && !added_base_tag_) {
    added_base_tag_ = true;
    HtmlElement* new_element = driver_->NewElement(element, HtmlName::kBase);
    driver_->AddAttribute(new_element, HtmlName::kHref,
                          driver_->decoded_base());
    driver_->InsertNodeAfterCurrent(new_element);
  }
}

}  // namespace net_instaweb