Skip to content
Permalink
9bfb9ba527
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
 
 
Cannot retrieve contributors at this time
82 lines (71 sloc) 2.07 KB
'use strict';
var GetIntrinsic = require('get-intrinsic');
var $Number = GetIntrinsic('%Number%');
var $TypeError = GetIntrinsic('%TypeError%');
var $isNaN = require('../helpers/isNaN');
var IsStringPrefix = require('./IsStringPrefix');
var StringToBigInt = require('./StringToBigInt');
var ToNumeric = require('./ToNumeric');
var ToPrimitive = require('./ToPrimitive');
var Type = require('./Type');
var BigIntLessThan = require('./BigInt/lessThan');
var NumberLessThan = require('./Number/lessThan');
// https://262.ecma-international.org/9.0/#sec-abstract-relational-comparison
// eslint-disable-next-line max-statements, max-lines-per-function
module.exports = function AbstractRelationalComparison(x, y, LeftFirst) {
if (Type(LeftFirst) !== 'Boolean') {
throw new $TypeError('Assertion failed: LeftFirst argument must be a Boolean');
}
var px;
var py;
if (LeftFirst) {
px = ToPrimitive(x, $Number);
py = ToPrimitive(y, $Number);
} else {
py = ToPrimitive(y, $Number);
px = ToPrimitive(x, $Number);
}
if (Type(px) === 'String' && Type(py) === 'String') {
if (IsStringPrefix(py, px)) {
return false;
}
if (IsStringPrefix(px, py)) {
return true;
}
return px < py; // both strings, neither a prefix of the other. shortcut for steps 3 c-f
}
var pxType = Type(px);
var pyType = Type(py);
var nx;
var ny;
if (pxType === 'BigInt' && pyType === 'String') {
ny = StringToBigInt(py);
if ($isNaN(ny)) {
return void undefined;
}
return BigIntLessThan(px, ny);
}
if (pxType === 'String' && pyType === 'BigInt') {
nx = StringToBigInt(px);
if ($isNaN(nx)) {
return void undefined;
}
return BigIntLessThan(nx, py);
}
nx = ToNumeric(px);
ny = ToNumeric(py);
var nxType = Type(nx);
if (nxType === Type(ny)) {
return nxType === 'Number' ? NumberLessThan(nx, ny) : BigIntLessThan(nx, ny);
}
if ($isNaN(nx) || $isNaN(ny)) {
return void undefined;
}
if (nx === -Infinity || ny === Infinity) {
return true;
}
if (nx === Infinity || ny === -Infinity) {
return false;
}
return nx < ny; // by now, these are both nonzero, finite, and not equal
};