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115 lines
3.8 KiB
115 lines
3.8 KiB
"use strict"; |
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var isPlainFunction = require("type/plain-function/is") |
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, ensureValue = require("type/value/ensure") |
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, isValue = require("type/value/is") |
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, map = require("es5-ext/object/map") |
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, contains = require("es5-ext/string/#/contains"); |
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var 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, 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, flat; |
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options = Object(ensureValue(options)); |
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cacheName = options.cacheName; |
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flat = options.flat; |
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if (!isValue(cacheName)) cacheName = name; |
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delete options.cacheName; |
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value = options.value; |
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resolvable = isPlainFunction(value); |
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delete options.value; |
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dgs = { configurable: Boolean(options.configurable), 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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