118 lines
3.8 KiB
JavaScript
118 lines
3.8 KiB
JavaScript
'use strict';
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var map = require('es5-ext/object/map')
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, isCallable = require('es5-ext/object/is-callable')
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, validValue = require('es5-ext/object/valid-value')
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, contains = require('es5-ext/string/#/contains')
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, call = Function.prototype.call
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, defineProperty = Object.defineProperty
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, getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor
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, getPrototypeOf = Object.getPrototypeOf
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, hasOwnProperty = Object.prototype.hasOwnProperty
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, cacheDesc = { configurable: false, enumerable: false, writable: false,
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value: null }
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, define;
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define = function (name, options) {
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var value, dgs, cacheName, desc, writable = false, resolvable
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, flat;
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options = Object(validValue(options));
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cacheName = options.cacheName;
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flat = options.flat;
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if (cacheName == null) cacheName = name;
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delete options.cacheName;
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value = options.value;
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resolvable = isCallable(value);
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delete options.value;
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dgs = { configurable: Boolean(options.configurable),
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enumerable: Boolean(options.enumerable) };
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if (name !== cacheName) {
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dgs.get = function () {
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if (hasOwnProperty.call(this, cacheName)) return this[cacheName];
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cacheDesc.value = resolvable ? call.call(value, this, options) : value;
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cacheDesc.writable = writable;
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defineProperty(this, cacheName, cacheDesc);
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cacheDesc.value = null;
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if (desc) defineProperty(this, name, desc);
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return this[cacheName];
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};
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} else if (!flat) {
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dgs.get = function self() {
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var ownDesc;
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if (hasOwnProperty.call(this, name)) {
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ownDesc = getOwnPropertyDescriptor(this, name);
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// It happens in Safari, that getter is still called after property
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// was defined with a value, following workarounds that
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// While in IE11 it may happen that here ownDesc is undefined (go figure)
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if (ownDesc) {
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if (ownDesc.hasOwnProperty('value')) return ownDesc.value;
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if ((typeof ownDesc.get === 'function') && (ownDesc.get !== self)) {
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return ownDesc.get.call(this);
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}
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return value;
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}
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}
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desc.value = resolvable ? call.call(value, this, options) : value;
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defineProperty(this, name, desc);
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desc.value = null;
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return this[name];
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};
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} else {
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dgs.get = function self() {
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var base = this, ownDesc;
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if (hasOwnProperty.call(this, name)) {
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// It happens in Safari, that getter is still called after property
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// was defined with a value, following workarounds that
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ownDesc = getOwnPropertyDescriptor(this, name);
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if (ownDesc.hasOwnProperty('value')) return ownDesc.value;
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if ((typeof ownDesc.get === 'function') && (ownDesc.get !== self)) {
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return ownDesc.get.call(this);
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}
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}
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while (!hasOwnProperty.call(base, name)) base = getPrototypeOf(base);
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desc.value = resolvable ? call.call(value, base, options) : value;
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defineProperty(base, name, desc);
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desc.value = null;
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return base[name];
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};
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}
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dgs.set = function (value) {
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if (hasOwnProperty.call(this, name)) {
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throw new TypeError("Cannot assign to lazy defined '" + name + "' property of " + this);
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}
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dgs.get.call(this);
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this[cacheName] = value;
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};
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if (options.desc) {
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desc = {
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configurable: contains.call(options.desc, 'c'),
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enumerable: contains.call(options.desc, 'e')
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};
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if (cacheName === name) {
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desc.writable = contains.call(options.desc, 'w');
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desc.value = null;
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} else {
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writable = contains.call(options.desc, 'w');
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desc.get = dgs.get;
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desc.set = dgs.set;
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}
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delete options.desc;
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} else if (cacheName === name) {
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desc = {
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configurable: Boolean(options.configurable),
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enumerable: Boolean(options.enumerable),
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writable: Boolean(options.writable),
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value: null
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};
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}
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delete options.configurable;
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delete options.enumerable;
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delete options.writable;
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return dgs;
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};
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module.exports = function (props) {
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return map(props, function (desc, name) { return define(name, desc); });
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};
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