git.r.bdr.sh - rbdr/dotfiles/blob

   1 'use strict';
   2
   3 var value = require('./valid-value')
   4   , mixin = require('./mixin')
   5
   6   , defineProperty = Object.defineProperty
   7   , getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor
   8   , getOwnPropertyNames = Object.getOwnPropertyNames
   9   , getPrototypeOf = Object.getPrototypeOf
  10   , hasOwnProperty = Object.prototype.hasOwnProperty;
  11
  12 module.exports = function (target, source) {
  13         var error, end, define;
  14         target = Object(value(target));
  15         source = Object(value(source));
  16         end = getPrototypeOf(target);
  17         if (source === end) return target;
  18         try {
  19                 mixin(target, source);
  20         } catch (e) { error = e; }
  21         source = getPrototypeOf(source);
  22         define = function (name) {
  23                 if (hasOwnProperty.call(target, name)) return;
  24                 try {
  25                         defineProperty(target, name, getOwnPropertyDescriptor(source, name));
  26                 } catch (e) { error = e; }
  27         };
  28         while (source && (source !== end)) {
  29                 getOwnPropertyNames(source).forEach(define);
  30                 source = getPrototypeOf(source);
  31         }
  32         if (error) throw error;
  33         return target;
  34 };