forked from lix-project/lix-website
58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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'use strict';
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var StrictEqualityComparison = require('./StrictEqualityComparison');
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var StringToBigInt = require('./StringToBigInt');
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var ToNumber = require('./ToNumber');
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var ToPrimitive = require('./ToPrimitive');
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var Type = require('./Type');
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var isNaN = require('../helpers/isNaN');
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// https://262.ecma-international.org/11.0/#sec-abstract-equality-comparison
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module.exports = function AbstractEqualityComparison(x, y) {
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var xType = Type(x);
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var yType = Type(y);
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if (xType === yType) {
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return StrictEqualityComparison(x, y);
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}
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if (x == null && y == null) {
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return true;
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}
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if (xType === 'Number' && yType === 'String') {
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return AbstractEqualityComparison(x, ToNumber(y));
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}
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if (xType === 'String' && yType === 'Number') {
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return AbstractEqualityComparison(ToNumber(x), y);
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}
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if (xType === 'BigInt' && yType === 'String') {
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var n = StringToBigInt(y);
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if (isNaN(n)) {
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return false;
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}
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return AbstractEqualityComparison(x, n);
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}
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if (xType === 'String' && yType === 'BigInt') {
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return AbstractEqualityComparison(y, x);
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}
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if (xType === 'Boolean') {
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return AbstractEqualityComparison(ToNumber(x), y);
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}
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if (yType === 'Boolean') {
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return AbstractEqualityComparison(x, ToNumber(y));
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}
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if ((xType === 'String' || xType === 'Number' || xType === 'BigInt' || xType === 'Symbol') && yType === 'Object') {
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return AbstractEqualityComparison(x, ToPrimitive(y));
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}
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if (xType === 'Object' && (yType === 'String' || yType === 'Number' || yType === 'BigInt' || yType === 'Symbol')) {
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return AbstractEqualityComparison(ToPrimitive(x), y);
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}
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if ((xType === 'BigInt' && yType === 'Number') || (xType === 'Number' && yType === 'BigInt')) {
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if (isNaN(x) || isNaN(y) || x === Infinity || y === Infinity || x === -Infinity || y === -Infinity) {
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return false;
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}
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return x == y; // eslint-disable-line eqeqeq
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}
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return false;
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};
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