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42 lines
1.1 KiB
42 lines
1.1 KiB
'use strict'; |
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var $TypeError = require('es-errors/type'); |
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var callBound = require('call-bound'); |
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var isInteger = require('math-intrinsics/isInteger'); |
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var $indexOf = callBound('String.prototype.indexOf'); |
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var IsArray = require('./IsArray'); |
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var WordCharacters = require('./WordCharacters'); |
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var every = require('../helpers/every'); |
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var isRegExpRecord = require('../helpers/records/regexp-record'); |
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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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module.exports = function IsWordChar(rer, Input, e) { |
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if (!isRegExpRecord(rer)) { |
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throw new $TypeError('Assertion failed: `rer` must be a RegExp Record'); |
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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 (!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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