php-parser/lib/PhpParser/Lexer/TokenEmulator/EnumTokenEmulator.php

<?php declare(strict_types=1);

namespace PhpParser\Lexer\TokenEmulator;

use PhpParser\Lexer\Emulative;

final class EnumTokenEmulator extends KeywordEmulator
{
    public function getPhpVersion(): string
    {
        return Emulative::PHP_8_1;
    }

    public function getKeywordString(): string
    {
        return 'enum';
    }

    public function getKeywordToken(): int
    {
        return \T_ENUM;
    }

    protected function isKeywordContext(array $tokens, int $pos): bool
    {
        return parent::isKeywordContext($tokens, $pos)
            && isset($tokens[$pos + 2])
            && $tokens[$pos + 1][0] === \T_WHITESPACE
            && $tokens[$pos + 2][0] === \T_STRING;
    }
}