54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
function set(obj, key, val) {
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if (typeof val.value === 'object') val.value = klona(val.value);
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if (!val.enumerable || val.get || val.set || !val.configurable || !val.writable || key === '__proto__') {
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Object.defineProperty(obj, key, val);
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} else obj[key] = val.value;
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}
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export function klona(x) {
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if (typeof x !== 'object') return x;
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var i=0, k, list, tmp, str=Object.prototype.toString.call(x);
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if (str === '[object Object]') {
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tmp = Object.create(x.__proto__ || null);
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} else if (str === '[object Array]') {
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tmp = Array(x.length);
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} else if (str === '[object Set]') {
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tmp = new Set;
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x.forEach(function (val) {
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tmp.add(klona(val));
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});
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} else if (str === '[object Map]') {
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tmp = new Map;
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x.forEach(function (val, key) {
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tmp.set(klona(key), klona(val));
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});
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} else if (str === '[object Date]') {
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tmp = new Date(+x);
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} else if (str === '[object RegExp]') {
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tmp = new RegExp(x.source, x.flags);
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} else if (str === '[object DataView]') {
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tmp = new x.constructor( klona(x.buffer) );
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} else if (str === '[object ArrayBuffer]') {
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tmp = x.slice(0);
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} else if (str.slice(-6) === 'Array]') {
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// ArrayBuffer.isView(x)
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// ~> `new` bcuz `Buffer.slice` => ref
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tmp = new x.constructor(x);
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}
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if (tmp) {
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for (list=Object.getOwnPropertySymbols(x); i < list.length; i++) {
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set(tmp, list[i], Object.getOwnPropertyDescriptor(x, list[i]));
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}
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for (i=0, list=Object.getOwnPropertyNames(x); i < list.length; i++) {
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if (Object.hasOwnProperty.call(tmp, k=list[i]) && tmp[k] === x[k]) continue;
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set(tmp, k, Object.getOwnPropertyDescriptor(x, k));
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}
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}
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return tmp || x;
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}
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