101 lines
2.8 KiB
JavaScript
101 lines
2.8 KiB
JavaScript
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'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 min = GetIntrinsic('%Math.min%');
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var $isNaN = require('../helpers/isNaN');
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var $charCodeAt = require('call-bind/callBound')('String.prototype.charCodeAt');
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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/14.0/#sec-islessthan
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// eslint-disable-next-line max-statements, max-lines-per-function
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module.exports = function IsLessThan(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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var pxType = Type(px);
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var pyType = Type(py);
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if (pxType === 'String' && pyType === 'String') { // step 3
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// a. Let lx be the length of px.
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// b. Let ly be the length of py.
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// c. For each integer i starting with 0 such that i < min(lx, ly), in ascending order, do
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// i. Let cx be the integer that is the numeric value of the code unit at index i within px.
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// ii. Let cy be the integer that is the numeric value of the code unit at index i within py.
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// iii. If cx < cy, return true.
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// iv. If cx > cy, return false.
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// d. If lx < ly, return true. Otherwise, return false.
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var lx = px.length; // step 3.a
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var ly = py.length; // step 3.b
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for (var i = 0; i < min(lx, ly); i++) { // step 3.c
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var cx = $charCodeAt(px, i); // step 3.c.i
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var cy = $charCodeAt(py, i); // step 3.c.ii
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if (cx < cy) {
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return true; // step 3.c.iii
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}
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if (cx > cy) {
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return false; // step 3.c.iv
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}
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}
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return lx < ly; // step 3.d
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}
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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 (typeof ny === 'undefined') {
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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 (typeof nx === 'undefined') {
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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 finite, and the same type
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};
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