| 1 | 'use strict';
|
|---|
| 2 |
|
|---|
| 3 | var StrictEqualityComparison = require('./StrictEqualityComparison');
|
|---|
| 4 | var StringToBigInt = require('./StringToBigInt');
|
|---|
| 5 | var ToNumber = require('./ToNumber');
|
|---|
| 6 | var ToPrimitive = require('./ToPrimitive');
|
|---|
| 7 | var Type = require('./Type');
|
|---|
| 8 |
|
|---|
| 9 | var isNaN = require('../helpers/isNaN');
|
|---|
| 10 |
|
|---|
| 11 | // https://262.ecma-international.org/11.0/#sec-abstract-equality-comparison
|
|---|
| 12 |
|
|---|
| 13 | module.exports = function AbstractEqualityComparison(x, y) {
|
|---|
| 14 | var xType = Type(x);
|
|---|
| 15 | var yType = Type(y);
|
|---|
| 16 | if (xType === yType) {
|
|---|
| 17 | return StrictEqualityComparison(x, y);
|
|---|
| 18 | }
|
|---|
| 19 | if (x == null && y == null) {
|
|---|
| 20 | return true;
|
|---|
| 21 | }
|
|---|
| 22 | if (xType === 'Number' && yType === 'String') {
|
|---|
| 23 | return AbstractEqualityComparison(x, ToNumber(y));
|
|---|
| 24 | }
|
|---|
| 25 | if (xType === 'String' && yType === 'Number') {
|
|---|
| 26 | return AbstractEqualityComparison(ToNumber(x), y);
|
|---|
| 27 | }
|
|---|
| 28 | if (xType === 'BigInt' && yType === 'String') {
|
|---|
| 29 | var n = StringToBigInt(y);
|
|---|
| 30 | if (isNaN(n)) {
|
|---|
| 31 | return false;
|
|---|
| 32 | }
|
|---|
| 33 | return AbstractEqualityComparison(x, n);
|
|---|
| 34 | }
|
|---|
| 35 | if (xType === 'String' && yType === 'BigInt') {
|
|---|
| 36 | return AbstractEqualityComparison(y, x);
|
|---|
| 37 | }
|
|---|
| 38 | if (xType === 'Boolean') {
|
|---|
| 39 | return AbstractEqualityComparison(ToNumber(x), y);
|
|---|
| 40 | }
|
|---|
| 41 | if (yType === 'Boolean') {
|
|---|
| 42 | return AbstractEqualityComparison(x, ToNumber(y));
|
|---|
| 43 | }
|
|---|
| 44 | if ((xType === 'String' || xType === 'Number' || xType === 'BigInt' || xType === 'Symbol') && yType === 'Object') {
|
|---|
| 45 | return AbstractEqualityComparison(x, ToPrimitive(y));
|
|---|
| 46 | }
|
|---|
| 47 | if (xType === 'Object' && (yType === 'String' || yType === 'Number' || yType === 'BigInt' || yType === 'Symbol')) {
|
|---|
| 48 | return AbstractEqualityComparison(ToPrimitive(x), y);
|
|---|
| 49 | }
|
|---|
| 50 | if ((xType === 'BigInt' && yType === 'Number') || (xType === 'Number' && yType === 'BigInt')) {
|
|---|
| 51 | if (isNaN(x) || isNaN(y) || x === Infinity || y === Infinity || x === -Infinity || y === -Infinity) {
|
|---|
| 52 | return false;
|
|---|
| 53 | }
|
|---|
| 54 | return x == y; // eslint-disable-line eqeqeq
|
|---|
| 55 | }
|
|---|
| 56 | return false;
|
|---|
| 57 | };
|
|---|
