/*
 * 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 "pagespeed/kernel/html/canonical_attributes.h"

#include "pagespeed/kernel/html/html_element.h"

namespace net_instaweb {

class HtmlParse;

CanonicalAttributes::CanonicalAttributes(HtmlParse* html_parse)
    : html_parse_(html_parse),
      num_changes_(0),
      num_errors_(0) {
}

CanonicalAttributes::~CanonicalAttributes() {}

void CanonicalAttributes::StartDocument() {
  num_changes_ = 0;
  num_errors_ = 0;
}

void CanonicalAttributes::StartElement(HtmlElement* element) {
  HtmlElement::AttributeList* attrs = element->mutable_attributes();
  for (HtmlElement::AttributeIterator i(attrs->begin());
       i != attrs->end(); ++i) {
    HtmlElement::Attribute& attribute = *i;
    const char* value = attribute.DecodedValueOrNull();
    if (attribute.decoding_error()) {
      ++num_errors_;
    } else if (value != NULL) {
      ++num_changes_;

      // Recomputes escaped attribute.
      attribute.SetValue(value);
    }
  }
}

}  // namespace net_instaweb