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37 lines
1.1 KiB
37 lines
1.1 KiB
'use strict'; |
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var $TypeError = require('es-errors/type'); |
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var IsArray = require('./IsArray'); |
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var IsInteger = require('./IsInteger'); |
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var every = require('../helpers/every'); |
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var regexTester = require('safe-regex-test'); |
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var isChar = function isChar(c) { |
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return typeof c === 'string' && c.length === 1; |
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}; |
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var isWordCharacter = regexTester(/^[a-zA-Z0-9_]$/); |
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// https://262.ecma-international.org/6.0/#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) { |
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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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if (!IsInteger(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 (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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return isWordCharacter(c); // steps 3-4 |
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};
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