class TrailingArrayCommaSniff

class TrailingArrayCommaSniff implements Sniff {
    public const CODE_MISSING_TRAILING_COMMA = 'MissingTrailingComma';
    
    /** @var bool|null */
    public $enableAfterHeredoc = null;
    
    /**
     * @return array<int, (int|string)>
     */
    public function register() : array {
        return TokenHelper::$arrayTokenCodes;
    }
    
    /**
     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
     * @param int $stackPointer
     */
    public function process(File $phpcsFile, $stackPointer) : void {
        $this->enableAfterHeredoc = SniffSettingsHelper::isEnabledByPhpVersion($this->enableAfterHeredoc, 70300);
        $tokens = $phpcsFile->getTokens();
        [
            $arrayOpenerPointer,
            $arrayCloserPointer,
        ] = ArrayHelper::openClosePointers($tokens[$stackPointer]);
        if ($tokens[$arrayOpenerPointer]['line'] === $tokens[$arrayCloserPointer]['line']) {
            return;
        }
        
        /** @var int $pointerPreviousToClose */
        $pointerPreviousToClose = TokenHelper::findPreviousEffective($phpcsFile, $arrayCloserPointer - 1);
        $tokenPreviousToClose = $tokens[$pointerPreviousToClose];
        if ($pointerPreviousToClose === $arrayOpenerPointer || $tokenPreviousToClose['code'] === T_COMMA || $tokens[$arrayCloserPointer]['line'] === $tokenPreviousToClose['line']) {
            return;
        }
        if (!$this->enableAfterHeredoc && in_array($tokenPreviousToClose['code'], [
            T_END_HEREDOC,
            T_END_NOWDOC,
        ], true)) {
            return;
        }
        $fix = $phpcsFile->addFixableError('Multi-line arrays must have a trailing comma after the last element.', $pointerPreviousToClose, self::CODE_MISSING_TRAILING_COMMA);
        if (!$fix) {
            return;
        }
        $phpcsFile->fixer
            ->beginChangeset();
        $phpcsFile->fixer
            ->addContent($pointerPreviousToClose, ',');
        $phpcsFile->fixer
            ->endChangeset();
    }

}