// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

/**
 * @param {MetadataDispatcher} parent Parent object.
 * @param {string} type Parser type.
 * @param {RegExp} urlFilter RegExp to match URLs.
 * @constructor
 */
function MetadataParser(parent, type, urlFilter) {
  this.parent_ = parent;
  this.type = type;
  this.urlFilter = urlFilter;
  this.verbose = parent.verbose;
  this.mimeType = 'unknown';
}

/**
 * Output an error message.
 * @param {...Object} var_args Arguments.
 */
MetadataParser.prototype.error = function(var_args) {
  this.parent_.error.apply(this.parent_, arguments);
};

/**
 * Output a log message.
 * @param {...Object} var_args Arguments.
 */
MetadataParser.prototype.log = function(var_args) {
  this.parent_.log.apply(this.parent_, arguments);
};

/**
 * Output a log message if |verbose| flag is on.
 * @param {...Object} var_args Arguments.
 */
MetadataParser.prototype.vlog = function(var_args) {
  if (this.verbose)
    this.parent_.log.apply(this.parent_, arguments);
};

/**
 * @return {Object} Metadata object with the minimal set of properties.
 */
MetadataParser.prototype.createDefaultMetadata = function() {
  return {
    type: this.type,
    mimeType: this.mimeType
  };
};

/* Base class for image metadata parsers */
function ImageParser(parent, type, urlFilter) {
  MetadataParser.apply(this, arguments);
  this.mimeType = 'image/' + this.type;
}

ImageParser.prototype = {__proto__: MetadataParser.prototype};