You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
1.6 KiB
63 lines
1.6 KiB
'use strict'; |
|
|
|
var GetIntrinsic = require('get-intrinsic'); |
|
|
|
var $Number = GetIntrinsic('%Number%'); |
|
var $TypeError = GetIntrinsic('%TypeError%'); |
|
|
|
var $isNaN = require('../helpers/isNaN'); |
|
var $isFinite = require('../helpers/isFinite'); |
|
var isPrefixOf = require('../helpers/isPrefixOf'); |
|
|
|
var ToNumber = require('./ToNumber'); |
|
var ToPrimitive = require('./ToPrimitive'); |
|
var Type = require('./Type'); |
|
|
|
// https://262.ecma-international.org/5.1/#sec-11.8.5 |
|
|
|
// eslint-disable-next-line max-statements |
|
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, $Number); |
|
} |
|
var bothStrings = Type(px) === 'String' && Type(py) === 'String'; |
|
if (!bothStrings) { |
|
var nx = ToNumber(px); |
|
var ny = ToNumber(py); |
|
if ($isNaN(nx) || $isNaN(ny)) { |
|
return undefined; |
|
} |
|
if ($isFinite(nx) && $isFinite(ny) && nx === ny) { |
|
return false; |
|
} |
|
if (nx === Infinity) { |
|
return false; |
|
} |
|
if (ny === Infinity) { |
|
return true; |
|
} |
|
if (ny === -Infinity) { |
|
return false; |
|
} |
|
if (nx === -Infinity) { |
|
return true; |
|
} |
|
return nx < ny; // by now, these are both nonzero, finite, and not equal |
|
} |
|
if (isPrefixOf(py, px)) { |
|
return false; |
|
} |
|
if (isPrefixOf(px, py)) { |
|
return true; |
|
} |
|
return px < py; // both strings, neither a prefix of the other. shortcut for steps c-f |
|
};
|
|
|