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index.js
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index.js
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/**
* Extends a variable number of native constructors (i.e. `Function`, `Array`,
* `Number`, etc.) with the `create()` function
*/
exports = module.exports = function () {
for (var i=0, l=arguments.length; i<l; i++) {
setup(arguments[i])
}
}
/**
* Internal function that does that actual extending. You normally just invoke
* this module's exports as a function instead. These are equivalent:
*
* ```
* require('create')(Function)
* require('create').setup(Function)
* ```
*
* @private true
*/
function setup (ctor) {
//console.error('Setting Up: %s', ctor.name)
var m;
try {
m = require('./' + ctor.name.toLowerCase())
} catch (e) {
throw new Error('Constructor is unknown or unimplemented: ' + ctor.name + '\n' + e)
}
if (!ctor.create) {
function create () {
var argc = arguments.length
if (argc < 1) {
throw new TypeError(ctor.name + ' prototype may only be an Object or null')
}
var objectDescriptor = arguments[--argc]
, instance = null
, proto = null
if (exports.isObjectDescriptor(objectDescriptor)) {
proto = arguments[--argc]
} else {
proto = objectDescriptor
objectDescriptor = null
}
var instance = m.newInstance(ctor, argc, arguments)
// Set the instance's `prototype`
instance.__proto__ = proto
if (objectDescriptor) {
// If an object descriptor was passed in, define those
Object.defineProperties(instance, objectDescriptor)
}
return instance
}
ctor.create = create
}
var is = 'is' + ctor.name
if (!ctor[is]) {
//console.error('Setting up %s.%s()', ctor.name, is)
ctor[is] = m.getIsFunc(ctor)
}
return ctor
}
exports.setup = setup
/**
* Setup getters for extending the regular natives
*/
;[Array, Boolean, Date, Function, Number, Object, RegExp, String].forEach(
function (c) {
Object.defineProperty(exports, c.name, {
enumerable: true
, configurable: true
, get: function () {
return exports[c.name] = exports.setup(c)
}
, set: function (v) {
Object.defineProperty(exports, c.name, {
enumerable: true
, configurable: true
, writable: true
, value: v
})
}
})
})
/**
* Tests for an Object Descriptor.
* For example:
*
* {
* foo: {
* enumerable: false
* , configurable: true
* , value: 'bar'
* }
* }
*/
function isObjectDescriptor (o) {
if (typeof o !== 'object' || o === null)
return false
for (var i in o) {
if (!Object.prototype.hasOwnProperty.call(o, i))
continue
if (!exports.isPropertyDescriptor(o[i]))
return false
}
if (!i) return false
return true
}
exports.isObjectDescriptor = isObjectDescriptor
/**
* Tests for a Property Descriptor.
* For example:
*
* {
* enumerable: false
* , configurable: true
* , get: function () {
* return Math.random()
* }
* }
*/
function isPropertyDescriptor (o) {
if (typeof o !== 'object')
//if (typeof o !== 'object' || o === null)
return false
return 'value' in o
|| 'writable' in o
|| 'get' in o
|| 'set' in o
|| 'configurable' in o
|| 'enumerable' in o
}
exports.isPropertyDescriptor = isPropertyDescriptor