Constnium/node_modules/es-abstract/2022/AdvanceStringIndex.js
2022-06-23 02:27:43 +02:00

34 lines
1,010 B
JavaScript

'use strict';
var GetIntrinsic = require('get-intrinsic');
var CodePointAt = require('./CodePointAt');
var IsIntegralNumber = require('./IsIntegralNumber');
var Type = require('./Type');
var MAX_SAFE_INTEGER = require('../helpers/maxSafeInteger');
var $TypeError = GetIntrinsic('%TypeError%');
// https://ecma-international.org/ecma-262/12.0/#sec-advancestringindex
module.exports = function AdvanceStringIndex(S, index, unicode) {
if (Type(S) !== 'String') {
throw new $TypeError('Assertion failed: `S` must be a String');
}
if (!IsIntegralNumber(index) || index < 0 || index > MAX_SAFE_INTEGER) {
throw new $TypeError('Assertion failed: `length` must be an integer >= 0 and <= 2**53');
}
if (Type(unicode) !== 'Boolean') {
throw new $TypeError('Assertion failed: `unicode` must be a Boolean');
}
if (!unicode) {
return index + 1;
}
var length = S.length;
if ((index + 1) >= length) {
return index + 1;
}
var cp = CodePointAt(S, index);
return index + cp['[[CodeUnitCount]]'];
};