ubdate

node_modules/es-abstract/2020/AbstractRelationalComparison.js

@@ -0,0 +1,82 @@
+'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 ($isNaN(nx)) {
+			return void undefined;
+		}
+		return BigIntLessThan(px, ny);
+	}
+
+	nx = ToNumeric(px);
+	ny = ToNumeric(py);
+	var nxType = Type(nx);
+	if (nxType === Type(ny)) {
+		return nxType === 'Number' ? NumberLessThan(nx, ny) : BigIntLessThan(nx, ny);
+	}
+
+	if ($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
+};