parse-js/dist/transformers/array.js

Utility library for object structure conversion.

'use strict';

var isArray = require('lodash/isArray');

var parseJSON = require('../lib/json').parse;

var MODE_ANY = 'ANY';
var MODE_JSON = 'JSON';
var MODE_SEPARATOR = 'SEPARATOR';

function ArrayTransformer() {
  var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

  if (!(this instanceof ArrayTransformer)) {
    return this.transform(new ArrayTransformer(options));
  }

  this._mode = options.mode || MODE_ANY;
  this._separator = options.separator || ',';
}

ArrayTransformer.ANY = MODE_ANY;
ArrayTransformer.JSON = MODE_JSON;
ArrayTransformer.SEPARATOR = MODE_SEPARATOR;

ArrayTransformer.prototype.parse = function (value) {
  if (!value && typeof value !== 'number') return [];
  if (isArray(value)) return value;
  var result = value;
  if (typeof value !== 'string') value = value + '';
  if (this._mode === MODE_JSON || this._mode === MODE_ANY) result = parseJSON(value);
  if (!isArray(result)) result = null;
  if (this._mode === MODE_SEPARATOR || this._mode === MODE_ANY && !result) result = value.split(this._separator);
  if (!isArray(result)) result = [];
  return result;
};

ArrayTransformer.prototype.reverse = function (value) {
  if (!isArray(value)) return value;
  if (this._mode === MODE_JSON || this._mode === MODE_ANY) return JSON.stringify(value);
  if (this._mode === MODE_SEPARATOR) return value.join(this._separator);
  return value;
};

module.exports = ArrayTransformer;