source: frontend/node_modules/es-abstract/2015/IsWordChar.js

'use strict';

var $TypeError = require('es-errors/type');

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
};