parse-js/dist/transformers/bool.js

Utility library for object structure conversion.

'use strict';

var _isUndefined = require('lodash/isUndefined');

var _includes = require('lodash/includes');

var TRUE = ['1', 'true', 'yes', 'y'];
var BOOLEAN = 'BOOLEAN';
var STRING = 'STRING';
var NUMBER = 'NUMBER';

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

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

  this._defaultValue = options.defaultValue;
  this._reverseTo = options.reverseTo || BOOLEAN;
}

BooleanTransformer.BOOLEAN = BOOLEAN;
BooleanTransformer.STRING = STRING;
BooleanTransformer.NUMBER = NUMBER;

BooleanTransformer.prototype.parse = function (value) {
  if (_isUndefined(value) && !_isUndefined(this._defaultValue)) return this._defaultValue;
  return typeof value === 'string' ? _includes(TRUE, value.toLowerCase()) : !!value;
};

BooleanTransformer.prototype.reverse = function (source) {
  source = !!source;

  if (this._reverseTo === STRING) {
    return source ? 'true' : 'false';
  }

  if (this._reverseTo === NUMBER) {
    return source ? 1 : 0;
  }

  return source;
};

module.exports = BooleanTransformer;