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// Copyright 2007 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//      http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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 * @fileoverview Protocol buffer serializer.
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 * @author [email protected] (Erik Arvidsson)
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 */
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// TODO(arv): Serialize booleans as 0 and 1
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goog.provide('goog.proto.Serializer');
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goog.require('goog.json.Serializer');
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goog.require('goog.string');
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/**
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 * Object that can serialize objects or values to a protocol buffer string.
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 * @constructor
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 * @extends {goog.json.Serializer}
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 * @final
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 */
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goog.proto.Serializer = function() {
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  goog.json.Serializer.call(this);
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};
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goog.inherits(goog.proto.Serializer, goog.json.Serializer);
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/**
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 * Serializes an array to a protocol buffer string. This overrides the JSON
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 * method to don't output trailing null or undefined.
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 * @param {Array<*>} arr The array to serialize.
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 * @param {Array<string>} sb Array used as a string builder.
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 * @override
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 */
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goog.proto.Serializer.prototype.serializeArray = function(arr, sb) {
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  var l = arr.length;
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  sb.push('[');
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  var emptySlots = 0;
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  var sep = '';
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  for (var i = 0; i < l; i++) {
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    if (arr[i] == null) {  // catches undefined as well
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      emptySlots++;
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    } else {
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      sb.push(sep);
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      if (emptySlots > 0) {
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        sb.push(goog.string.repeat('null,', emptySlots));
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        emptySlots = 0;
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      }
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      this.serializeInternal(arr[i], sb);
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      sep = ',';
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    }
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  }
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  sb.push(']');
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};
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