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- 'use strict';
- var GetIntrinsic = require('get-intrinsic');
- var $TypeError = GetIntrinsic('%TypeError%');
- var IsArray = require('./IsArray');
- var IsInteger = require('./IsInteger');
- var every = require('../helpers/every');
- var regexTester = require('safe-regex-test');
- var isChar = function isChar(c) {
- return typeof c === 'string' && c.length === 1;
- };
- var isWordCharacter = regexTester(/^[a-zA-Z0-9_]$/);
- // https://262.ecma-international.org/6.0/#sec-runtime-semantics-iswordchar-abstract-operation
- // note: prior to ES2023, this AO erroneously omitted the latter of its arguments.
- module.exports = function IsWordChar(e, InputLength, Input) {
- if (!IsInteger(e)) {
- throw new $TypeError('Assertion failed: `e` must be an integer');
- }
- if (!IsInteger(InputLength)) {
- throw new $TypeError('Assertion failed: `InputLength` must be an integer');
- }
- if (!IsArray(Input) || !every(Input, isChar)) {
- throw new $TypeError('Assertion failed: `Input` must be a List of characters');
- }
- if (e === -1 || e === InputLength) {
- return false; // step 1
- }
- var c = Input[e]; // step 2
- return isWordCharacter(c); // steps 3-4
- };
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