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

   1 'use strict';
   2
   3 var copy       = require('es5-ext/object/copy')
   4   , map        = require('es5-ext/object/map')
   5   , callable   = require('es5-ext/object/valid-callable')
   6   , validValue = require('es5-ext/object/valid-value')
   7
   8   , bind = Function.prototype.bind, defineProperty = Object.defineProperty
   9   , hasOwnProperty = Object.prototype.hasOwnProperty
  10   , define;
  11
  12 define = function (name, desc, bindTo) {
  13         var value = validValue(desc) && callable(desc.value), dgs;
  14         dgs = copy(desc);
  15         delete dgs.writable;
  16         delete dgs.value;
  17         dgs.get = function () {
  18                 if (hasOwnProperty.call(this, name)) return value;
  19                 desc.value = bind.call(value, (bindTo == null) ? this : this[bindTo]);
  20                 defineProperty(this, name, desc);
  21                 return this[name];
  22         };
  23         return dgs;
  24 };
  25
  26 module.exports = function (props/*, bindTo*/) {
  27         var bindTo = arguments[1];
  28         return map(props, function (desc, name) {
  29                 return define(name, desc, bindTo);
  30         });
  31 };