28 lines
896 B
JavaScript
28 lines
896 B
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var substring = require('./substring');
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var Type = require('./Type');
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var assertRecord = require('../helpers/assertRecord');
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// https://262.ecma-international.org/13.0/#sec-getmatchstring
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module.exports = function GetMatchString(S, match) {
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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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assertRecord(Type, 'Match Record', 'match', match);
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if (!(match['[[StartIndex]]'] <= S.length)) {
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throw new $TypeError('`match` [[StartIndex]] must be a non-negative integer <= the length of S');
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}
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if (!(match['[[EndIndex]]'] <= S.length)) {
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throw new $TypeError('`match` [[EndIndex]] must be an integer between [[StartIndex]] and the length of S, inclusive');
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}
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return substring(S, match['[[StartIndex]]'], match['[[EndIndex]]']);
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};
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