83 lines
2.1 KiB
JavaScript
83 lines
2.1 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $Number = GetIntrinsic('%Number%');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $isNaN = require('../helpers/isNaN');
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var IsStringPrefix = require('./IsStringPrefix');
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var StringToBigInt = require('./StringToBigInt');
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var ToNumeric = require('./ToNumeric');
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var ToPrimitive = require('./ToPrimitive');
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var Type = require('./Type');
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var BigIntLessThan = require('./BigInt/lessThan');
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var NumberLessThan = require('./Number/lessThan');
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// https://262.ecma-international.org/9.0/#sec-abstract-relational-comparison
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// eslint-disable-next-line max-statements, max-lines-per-function
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module.exports = function AbstractRelationalComparison(x, y, LeftFirst) {
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if (Type(LeftFirst) !== 'Boolean') {
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throw new $TypeError('Assertion failed: LeftFirst argument must be a Boolean');
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}
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var px;
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var py;
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if (LeftFirst) {
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px = ToPrimitive(x, $Number);
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py = ToPrimitive(y, $Number);
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} else {
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py = ToPrimitive(y, $Number);
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px = ToPrimitive(x, $Number);
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}
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if (Type(px) === 'String' && Type(py) === 'String') {
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if (IsStringPrefix(py, px)) {
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return false;
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}
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if (IsStringPrefix(px, py)) {
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return true;
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}
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return px < py; // both strings, neither a prefix of the other. shortcut for steps 3 c-f
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}
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var pxType = Type(px);
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var pyType = Type(py);
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var nx;
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var ny;
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if (pxType === 'BigInt' && pyType === 'String') {
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ny = StringToBigInt(py);
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if ($isNaN(ny)) {
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return void undefined;
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}
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return BigIntLessThan(px, ny);
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}
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if (pxType === 'String' && pyType === 'BigInt') {
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nx = StringToBigInt(px);
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if ($isNaN(nx)) {
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return void undefined;
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}
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return BigIntLessThan(nx, py);
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}
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nx = ToNumeric(px);
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ny = ToNumeric(py);
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var nxType = Type(nx);
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if (nxType === Type(ny)) {
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return nxType === 'Number' ? NumberLessThan(nx, ny) : BigIntLessThan(nx, ny);
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}
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if ($isNaN(nx) || $isNaN(ny)) {
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return void undefined;
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}
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if (nx === -Infinity || ny === Infinity) {
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return true;
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}
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if (nx === Infinity || ny === -Infinity) {
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return false;
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}
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return nx < ny; // by now, these are both nonzero, finite, and not equal
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};
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