46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
'use strict';
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var $TypeError = require('es-errors/type');
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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 IsIntegralNumber = require('./IsIntegralNumber');
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var WordCharacters = require('./WordCharacters');
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var every = require('../helpers/every');
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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/12.0/#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(e, InputLength, Input, IgnoreCase, Unicode) {
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if (!IsIntegralNumber(e)) {
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throw new $TypeError('Assertion failed: `e` must be an integer');
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}
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if (!IsIntegralNumber(InputLength)) {
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throw new $TypeError('Assertion failed: `InputLength` must be an integer');
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}
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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 (typeof IgnoreCase !== 'boolean' || typeof Unicode !== 'boolean') {
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throw new $TypeError('Assertion failed: `IgnoreCase` and `Unicode` must be booleans');
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}
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if (e === -1 || e === InputLength) {
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return false; // step 1
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}
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var c = Input[e]; // step 2
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var wordChars = WordCharacters(IgnoreCase, Unicode);
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return $indexOf(wordChars, c) > -1; // steps 3-4
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};
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