bdde081050
Added test to ensure that release notes are parsed properly Updated to latest dependencies to fix security vulnerability Updated GH Actions Workflow to run test before updating tag Updated README.md to reflect proper whatsnew documentation.
46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var IsInteger = require('./IsInteger');
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var Type = require('./Type');
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var MAX_SAFE_INTEGER = require('../helpers/maxSafeInteger');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $charCodeAt = require('../helpers/callBound')('String.prototype.charCodeAt');
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// https://ecma-international.org/ecma-262/6.0/#sec-advancestringindex
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module.exports = function AdvanceStringIndex(S, index, unicode) {
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if (Type(S) !== 'String') {
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throw new $TypeError('Assertion failed: `S` must be a String');
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}
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if (!IsInteger(index) || index < 0 || index > MAX_SAFE_INTEGER) {
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throw new $TypeError('Assertion failed: `length` must be an integer >= 0 and <= 2**53');
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}
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if (Type(unicode) !== 'Boolean') {
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throw new $TypeError('Assertion failed: `unicode` must be a Boolean');
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}
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if (!unicode) {
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return index + 1;
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}
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var length = S.length;
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if ((index + 1) >= length) {
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return index + 1;
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}
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var first = $charCodeAt(S, index);
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if (first < 0xD800 || first > 0xDBFF) {
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return index + 1;
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}
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var second = $charCodeAt(S, index + 1);
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if (second < 0xDC00 || second > 0xDFFF) {
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return index + 1;
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}
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return index + 2;
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};
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