sandpit/lib/utils/Is.js

A playground for creative coding using JavaScript and the canvas element

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * A utility for testing the type of a reference
 */
var Is = function () {
  function Is() {
    _classCallCheck(this, Is);
  }

  _createClass(Is, null, [{
    key: 'element',

    /**
     * Tests if the object is a HTMLElement
     * @param {object} object - The object to test
     * @returns {boolean} If set to true, the object is a HTMLElement
     */
    value: function element(object) {
      // Credit: http://stackoverflow.com/a/384380
      try {
        // Using W3 DOM2 (works for FF, Opera and Chrom)
        return object instanceof window.HTMLElement;
      } catch (e) {
        // Browsers not supporting W3 DOM2 don't have HTMLElement and
        // an exception is thrown and we end up here. Testing some
        // properties that all elements have. (works on IE7)
        return (typeof object === 'undefined' ? 'undefined' : _typeof(object)) === 'object' && object.nodeType === 1 && _typeof(object.style) === 'object' && _typeof(object.ownerDocument) === 'object';
      }
    }

    /**
     * Tests if the object is an array
     * @param {object} object - The object to test
     * @returns {boolean} If set to true, the object is an array
     */

  }, {
    key: 'array',
    value: function array(object) {
      return Object.prototype.toString.call(object) === '[object Array]';
    }

    /**
     * Tests if the object is an object, not an array
     * @param {object} object - The object to test
     * @returns {boolean} If set to true, the object is an object
     */

  }, {
    key: 'object',
    value: function object(_object) {
      return (typeof _object === 'undefined' ? 'undefined' : _typeof(_object)) === 'object' && !this.array(_object);
    }

    /**
     * Tests if the object is a canvas
     * @param {object} object - The object to test
     * @returns {boolean} If set to true, the object is a canvas
     */

  }, {
    key: 'canvas',
    value: function canvas(object) {
      return !!object.getContext;
    }
  }]);

  return Is;
}();

exports.default = Is;
module.exports = exports['default'];