Vulcan/packages/vulcan-lib/lib/modules/deep_extend.js

import { Utils } from './utils.js';

// see: http://stackoverflow.com/questions/9399365/deep-extend-like-jquerys-for-nodejs
Utils.deepExtend = function () {
  var options, name, src, copy, copyIsArray, clone, target = arguments[0] || {},
      i = 1,
      length = arguments.length,
      deep = false,
      toString = Object.prototype.toString,
      hasOwn = Object.prototype.hasOwnProperty,
      class2type = {
        '[object Boolean]': 'boolean',
        '[object Number]': 'number',
        '[object String]': 'string',
        '[object Function]': 'function',
        '[object Array]': 'array',
        '[object Date]': 'date',
        '[object RegExp]': 'regexp',
        '[object Object]': 'object'
      },
      jQuery = {
        isFunction: function (obj) {
          return jQuery.type(obj) === 'function';
        },
        isArray: Array.isArray ||
        function (obj) {
          return jQuery.type(obj) === 'array';
        },
        isWindow: function (obj) {
          return obj !== null && obj === obj.window;
        },
        isNumeric: function (obj) {
          return !isNaN(parseFloat(obj)) && isFinite(obj);
        },
        type: function (obj) {
          return obj === null ? String(obj) : class2type[toString.call(obj)] || 'object';
        },
        isPlainObject: function (obj) {
          if (!obj || jQuery.type(obj) !== 'object' || obj.nodeType) {
            return false;
          }
          try {
            if (obj.constructor && !hasOwn.call(obj, 'constructor') && !hasOwn.call(obj.constructor.prototype, 'isPrototypeOf')) {
              return false;
            }
          } catch (e) {
            return false;
          }
          var key;
          return key === undefined || hasOwn.call(obj, key);
        }
      };
    if (typeof target === 'boolean') {
      deep = target;
      target = arguments[1] || {};
      i = 2;
    }
    if (typeof target !== 'object' && !jQuery.isFunction(target)) {
      target = {};
    }
    if (length === i) {
      target = this;
      --i;
    }
    for (i; i < length; i++) {
      if ((options = arguments[i]) !== null) {
        for (name in options) {
          src = target[name];
          copy = options[name];
          if (target === copy) {
            continue;
          }
          if (deep && copy && (jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)))) {
            if (copyIsArray) {
              copyIsArray = false;
              clone = src && jQuery.isArray(src) ? src : [];
            } else {
              clone = src && jQuery.isPlainObject(src) ? src : {};
            }
            // WARNING: RECURSION
            target[name] = Utils.deepExtend(deep, clone, copy);
          } else if (copy !== undefined) {
            target[name] = copy;
          }
        }
      }
    }
    return target;
  };