| [d565449] | 1 | 'use strict';
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| 2 |
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| 3 | var GetIntrinsic = require('get-intrinsic');
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| 4 |
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| 5 | var $Number = GetIntrinsic('%Number%');
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| 6 | var $TypeError = require('es-errors/type');
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| 7 |
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| 8 | var $isNaN = require('../helpers/isNaN');
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| 9 | var $isFinite = require('../helpers/isFinite');
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| 10 | var isPrefixOf = require('../helpers/isPrefixOf');
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| 11 |
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| 12 | var ToNumber = require('./ToNumber');
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| 13 | var ToPrimitive = require('./ToPrimitive');
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| 14 |
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| 15 | // https://262.ecma-international.org/5.1/#sec-11.8.5
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| 16 |
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| 17 | // eslint-disable-next-line max-statements
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| 18 | module.exports = function AbstractRelationalComparison(x, y, LeftFirst) {
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| 19 | if (typeof LeftFirst !== 'boolean') {
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| 20 | throw new $TypeError('Assertion failed: LeftFirst argument must be a Boolean');
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| 21 | }
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| 22 | var px;
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| 23 | var py;
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| 24 | if (LeftFirst) {
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| 25 | px = ToPrimitive(x, $Number);
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| 26 | py = ToPrimitive(y, $Number);
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| 27 | } else {
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| 28 | py = ToPrimitive(y, $Number);
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| 29 | px = ToPrimitive(x, $Number);
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| 30 | }
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| 31 | var bothStrings = typeof px === 'string' && typeof py === 'string';
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| 32 | if (!bothStrings) {
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| 33 | var nx = ToNumber(px);
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| 34 | var ny = ToNumber(py);
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| 35 | if ($isNaN(nx) || $isNaN(ny)) {
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| 36 | return undefined;
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| 37 | }
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| 38 | if ($isFinite(nx) && $isFinite(ny) && nx === ny) {
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| 39 | return false;
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| 40 | }
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| 41 | if (nx === Infinity) {
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| 42 | return false;
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| 43 | }
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| 44 | if (ny === Infinity) {
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| 45 | return true;
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| 46 | }
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| 47 | if (ny === -Infinity) {
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| 48 | return false;
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| 49 | }
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| 50 | if (nx === -Infinity) {
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| 51 | return true;
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| 52 | }
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| 53 | return nx < ny; // by now, these are both nonzero, finite, and not equal
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| 54 | }
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| 55 | if (isPrefixOf(py, px)) {
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| 56 | return false;
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| 57 | }
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| 58 | if (isPrefixOf(px, py)) {
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| 59 | return true;
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| 60 | }
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| 61 | return px < py; // both strings, neither a prefix of the other. shortcut for steps c-f
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| 62 | };
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