49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
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 callBound = require('call-bind/callBound');
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var $indexOf = callBound('String.prototype.indexOf', true);
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var Canonicalize = require('./Canonicalize');
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var Type = require('./Type');
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var assertRecord = require('../helpers/assertRecord');
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var caseFolding = require('../helpers/caseFolding');
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var forEach = require('../helpers/forEach');
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var OwnPropertyKeys = require('../helpers/OwnPropertyKeys');
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var basicWordChars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_'; // step 1
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// https://262.ecma-international.org/14.0/#sec-runtime-semantics-wordcharacters-abstract-operation
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module.exports = function WordCharacters(rer) {
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assertRecord(Type, 'RegExp Record', 'rer', rer);
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var extraWordChars = '';
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forEach(OwnPropertyKeys(caseFolding.C), function (c) {
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if (
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$indexOf(basicWordChars, c) === -1 // c not in A
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&& $indexOf(basicWordChars, Canonicalize(rer, c)) > -1 // canonicalized c IS in A
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) {
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extraWordChars += caseFolding.C[c]; // step 3
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}
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});
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forEach(OwnPropertyKeys(caseFolding.S), function (c) {
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if (
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$indexOf(basicWordChars, c) === -1 // c not in A
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&& $indexOf(basicWordChars, Canonicalize(rer, c)) > -1 // canonicalized c IS in A
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) {
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extraWordChars += caseFolding.S[c]; // step 3
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}
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});
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if ((!rer['[[Unicode]]'] || !rer['[[IgnoreCase]]']) && extraWordChars.length > 0) {
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throw new $TypeError('Assertion failed: `extraWordChars` must be empty when `rer.[[IgnoreCase]]` and `rer.[[Unicode]]` are not both true'); // step 3
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}
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return basicWordChars + extraWordChars; // step 4
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};
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