class RequireNowdocSniff

class RequireNowdocSniff implements Sniff {
    public const CODE_REQUIRED_NOWDOC = 'RequiredNowdoc';
    
    /**
     * @return array<int, (int|string)>
     */
    public function register() : array {
        return [
            T_START_HEREDOC,
        ];
    }
    
    /**
     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
     * @param int $heredocStartPointer
     */
    public function process(File $phpcsFile, $heredocStartPointer) : void {
        $tokens = $phpcsFile->getTokens();
        $heredocEndPointer = TokenHelper::findNext($phpcsFile, T_END_HEREDOC, $heredocStartPointer + 1);
        $heredocContentPointers = [];
        for ($i = $heredocStartPointer + 1; $i < $heredocEndPointer; $i++) {
            if ($tokens[$i]['code'] === T_HEREDOC) {
                if (preg_match('~^([^\\\\$]|\\\\[^nrtvef0-7xu])*$~', $tokens[$i]['content']) === 0) {
                    return;
                }
                $heredocContentPointers[] = $i;
            }
        }
        $fix = $phpcsFile->addFixableError('Use nowdoc syntax instead of heredoc.', $heredocStartPointer, self::CODE_REQUIRED_NOWDOC);
        if (!$fix) {
            return;
        }
        $nowdocStart = preg_replace('~^<<<"?(\\w+)"?~', '<<<\'$1\'', $tokens[$heredocStartPointer]['content']);
        $phpcsFile->fixer
            ->beginChangeset();
        $phpcsFile->fixer
            ->replaceToken($heredocStartPointer, $nowdocStart);
        foreach ($heredocContentPointers as $heredocContentPointer) {
            $heredocContent = $tokens[$heredocContentPointer]['content'];
            $nowdocContent = preg_replace('~\\\\(\\\\[nrtvef]|\\$|\\\\|\\\\[0-7]{1,3}|\\\\x[0-9A-Fa-f]{1,2}|\\\\u\\{[0-9A-Fa-f]+\\})~', '$1', $heredocContent);
            $phpcsFile->fixer
                ->replaceToken($heredocContentPointer, $nowdocContent);
        }
        $phpcsFile->fixer
            ->endChangeset();
    }

}