Vulcan/lib/deepExtend.js

// see: http://stackoverflow.com/questions/9399365/deep-extend-like-jquerys-for-nodejs
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,
      push = Array.prototype.push,
      slice = Array.prototype.slice,
      trim = String.prototype.trim,
      indexOf = Array.prototype.indexOf,
      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;
          for (key in obj) {}
          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] = deepExtend(deep, clone, copy);
          } else if (copy !== undefined) {
            target[name] = copy;
          }
        }
      }
    }
    return target;
  };