85 lines
1.9 KiB
JavaScript
85 lines
1.9 KiB
JavaScript
var has = Object.prototype.hasOwnProperty;
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function find(iter, tar, key) {
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for (key of iter.keys()) {
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if (dequal(key, tar)) return key;
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}
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}
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export function dequal(foo, bar) {
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var ctor, len, tmp;
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if (foo === bar) return true;
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if (foo && bar && (ctor=foo.constructor) === bar.constructor) {
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if (ctor === Date) return foo.getTime() === bar.getTime();
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if (ctor === RegExp) return foo.toString() === bar.toString();
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if (ctor === Array) {
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if ((len=foo.length) === bar.length) {
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while (len-- && dequal(foo[len], bar[len]));
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}
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return len === -1;
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}
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if (ctor === Set) {
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if (foo.size !== bar.size) {
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return false;
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}
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for (len of foo) {
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tmp = len;
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if (tmp && typeof tmp === 'object') {
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tmp = find(bar, tmp);
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if (!tmp) return false;
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}
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if (!bar.has(tmp)) return false;
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}
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return true;
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}
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if (ctor === Map) {
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if (foo.size !== bar.size) {
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return false;
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}
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for (len of foo) {
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tmp = len[0];
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if (tmp && typeof tmp === 'object') {
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tmp = find(bar, tmp);
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if (!tmp) return false;
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}
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if (!dequal(len[1], bar.get(tmp))) {
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return false;
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}
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}
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return true;
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}
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if (ctor === ArrayBuffer) {
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foo = new Uint8Array(foo);
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bar = new Uint8Array(bar);
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} else if (ctor === DataView) {
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if ((len=foo.byteLength) === bar.byteLength) {
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while (len-- && foo.getInt8(len) === bar.getInt8(len));
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}
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return len === -1;
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}
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if (ArrayBuffer.isView(foo)) {
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if ((len=foo.byteLength) === bar.byteLength) {
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while (len-- && foo[len] === bar[len]);
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}
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return len === -1;
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}
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if (!ctor || typeof foo === 'object') {
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len = 0;
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for (ctor in foo) {
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if (has.call(foo, ctor) && ++len && !has.call(bar, ctor)) return false;
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if (!(ctor in bar) || !dequal(foo[ctor], bar[ctor])) return false;
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}
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return Object.keys(bar).length === len;
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}
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}
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return foo !== foo && bar !== bar;
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}
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