46 lines
1.2 KiB
JavaScript
46 lines
1.2 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');
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var IsArray = require('./IsArray');
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var Type = require('./Type');
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var WordCharacters = require('./WordCharacters');
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var assertRecord = require('../helpers/assertRecord');
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var every = require('../helpers/every');
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var isInteger = require('../helpers/isInteger');
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var isChar = function isChar(c) {
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return typeof c === 'string';
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};
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// https://262.ecma-international.org/14.0/#sec-runtime-semantics-iswordchar-abstract-operation
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// note: prior to ES2023, this AO erroneously omitted the latter of its arguments.
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module.exports = function IsWordChar(rer, Input, e) {
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assertRecord(Type, 'RegExp Record', 'rer', rer);
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if (!IsArray(Input) || !every(Input, isChar)) {
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throw new $TypeError('Assertion failed: `Input` must be a List of characters');
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}
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if (!isInteger(e)) {
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throw new $TypeError('Assertion failed: `e` must be an integer');
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}
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var InputLength = Input.length; // step 1
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if (e === -1 || e === InputLength) {
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return false; // step 2
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}
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var c = Input[e]; // step 3
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return $indexOf(WordCharacters(rer), c) > -1; // steps 4-5
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};
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