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

   1 'use strict';
   2
   3 var map        = require('es5-ext/object/map')
   4   , isCallable = require('es5-ext/object/is-callable')
   5   , validValue = require('es5-ext/object/valid-value')
   6   , contains   = require('es5-ext/string/#/contains')
   7
   8   , call = Function.prototype.call
   9   , defineProperty = Object.defineProperty
  10   , getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor
  11   , getPrototypeOf = Object.getPrototypeOf
  12   , hasOwnProperty = Object.prototype.hasOwnProperty
  13   , cacheDesc = { configurable: false, enumerable: false, writable: false,
  14                 value: null }
  15   , define;
  16
  17 define = function (name, options) {
  18         var value, dgs, cacheName, desc, writable = false, resolvable
  19           , flat;
  20         options = Object(validValue(options));
  21         cacheName = options.cacheName;
  22         flat = options.flat;
  23         if (cacheName == null) cacheName = name;
  24         delete options.cacheName;
  25         value = options.value;
  26         resolvable = isCallable(value);
  27         delete options.value;
  28         dgs = { configurable: Boolean(options.configurable),
  29                 enumerable: Boolean(options.enumerable) };
  30         if (name !== cacheName) {
  31                 dgs.get = function () {
  32                         if (hasOwnProperty.call(this, cacheName)) return this[cacheName];
  33                         cacheDesc.value = resolvable ? call.call(value, this, options) : value;
  34                         cacheDesc.writable = writable;
  35                         defineProperty(this, cacheName, cacheDesc);
  36                         cacheDesc.value = null;
  37                         if (desc) defineProperty(this, name, desc);
  38                         return this[cacheName];
  39                 };
  40         } else if (!flat) {
  41                 dgs.get = function self() {
  42                         var ownDesc;
  43                         if (hasOwnProperty.call(this, name)) {
  44                                 ownDesc = getOwnPropertyDescriptor(this, name);
  45                                 // It happens in Safari, that getter is still called after property
  46                                 // was defined with a value, following workarounds that
  47                                 if (ownDesc.hasOwnProperty('value')) return ownDesc.value;
  48                                 if ((typeof ownDesc.get === 'function') && (ownDesc.get !== self)) {
  49                                         return ownDesc.get.call(this);
  50                                 }
  51                                 return value;
  52                         }
  53                         desc.value = resolvable ? call.call(value, this, options) : value;
  54                         defineProperty(this, name, desc);
  55                         desc.value = null;
  56                         return this[name];
  57                 };
  58         } else {
  59                 dgs.get = function self() {
  60                         var base = this, ownDesc;
  61                         if (hasOwnProperty.call(this, name)) {
  62                                 // It happens in Safari, that getter is still called after property
  63                                 // was defined with a value, following workarounds that
  64                                 ownDesc = getOwnPropertyDescriptor(this, name);
  65                                 if (ownDesc.hasOwnProperty('value')) return ownDesc.value;
  66                                 if ((typeof ownDesc.get === 'function') && (ownDesc.get !== self)) {
  67                                         return ownDesc.get.call(this);
  68                                 }
  69                         }
  70                         while (!hasOwnProperty.call(base, name)) base = getPrototypeOf(base);
  71                         desc.value = resolvable ? call.call(value, base, options) : value;
  72                         defineProperty(base, name, desc);
  73                         desc.value = null;
  74                         return base[name];
  75                 };
  76         }
  77         dgs.set = function (value) {
  78                 dgs.get.call(this);
  79                 this[cacheName] = value;
  80         };
  81         if (options.desc) {
  82                 desc = {
  83                         configurable: contains.call(options.desc, 'c'),
  84                         enumerable: contains.call(options.desc, 'e')
  85                 };
  86                 if (cacheName === name) {
  87                         desc.writable = contains.call(options.desc, 'w');
  88                         desc.value = null;
  89                 } else {
  90                         writable = contains.call(options.desc, 'w');
  91                         desc.get = dgs.get;
  92                         desc.set = dgs.set;
  93                 }
  94                 delete options.desc;
  95         } else if (cacheName === name) {
  96                 desc = {
  97                         configurable: Boolean(options.configurable),
  98                         enumerable: Boolean(options.enumerable),
  99                         writable: Boolean(options.writable),
 100                         value: null
 101                 };
 102         }
 103         delete options.configurable;
 104         delete options.enumerable;
 105         delete options.writable;
 106         return dgs;
 107 };
 108
 109 module.exports = function (props) {
 110         return map(props, function (desc, name) { return define(name, desc); });
 111 };