class ArrayAccessSniff

class ArrayAccessSniff implements Sniff {
    public const CODE_NO_SPACE_BEFORE_BRACKETS = 'NoSpaceBeforeBrackets';
    public const CODE_NO_SPACE_BETWEEN_BRACKETS = 'NoSpaceBetweenBrackets';
    
    /**
     * @return list<string>
     */
    public function register() : array {
        return [
            T_OPEN_SQUARE_BRACKET,
        ];
    }
    
    /**
     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
     * @param int $stackPointer
     */
    public function process(File $phpcsFile, $stackPointer) : void {
        $tokens = $phpcsFile->getTokens();
        $previousToken = TokenHelper::findPreviousNonWhitespace($phpcsFile, $stackPointer - 1);
        if ($previousToken === null || $previousToken === $stackPointer - 1) {
            return;
        }
        if ($tokens[$previousToken]['code'] === T_VARIABLE) {
            $this->addError($phpcsFile, $stackPointer, 'There should be no space between array variable and array access operator.', self::CODE_NO_SPACE_BEFORE_BRACKETS);
        }
        if ($tokens[$previousToken]['code'] !== T_CLOSE_SQUARE_BRACKET) {
            return;
        }
        $this->addError($phpcsFile, $stackPointer, 'There should be no space between array access operators.', self::CODE_NO_SPACE_BETWEEN_BRACKETS);
    }
    private function addError(File $phpcsFile, int $stackPointer, string $error, string $code) : void {
        $fix = $phpcsFile->addFixableError($error, $stackPointer, $code);
        if (!$fix) {
            return;
        }
        $phpcsFile->fixer
            ->beginChangeset();
        $phpcsFile->fixer
            ->replaceToken($stackPointer - 1, '');
        $phpcsFile->fixer
            ->endChangeset();
    }

}