class SpaceUnaryOperatorSniff

class SpaceUnaryOperatorSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_DEC,
            T_INC,
            T_MINUS,
            T_PLUS,
            T_BOOLEAN_NOT,
        ];
    }
    
    //end register()
    
    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token in
     *                                               the stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        // Check decrement / increment.
        if ($tokens[$stackPtr]['code'] === T_DEC || $tokens[$stackPtr]['code'] === T_INC) {
            $previous = $phpcsFile->findPrevious(Tokens::$emptyTokens, $stackPtr - 1, null, true);
            $modifyLeft = in_array($tokens[$previous]['code'], [
                T_VARIABLE,
                T_CLOSE_SQUARE_BRACKET,
                T_CLOSE_PARENTHESIS,
                T_STRING,
            ]);
            if ($modifyLeft === true && $tokens[$stackPtr - 1]['code'] === T_WHITESPACE) {
                $error = 'There must not be a single space before a unary operator statement';
                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'IncDecLeft');
                if ($fix === true) {
                    $phpcsFile->fixer
                        ->replaceToken($stackPtr - 1, '');
                }
                return;
            }
            if ($modifyLeft === false && $tokens[$stackPtr + 1]['code'] === T_WHITESPACE) {
                $error = 'A unary operator statement must not be followed by a single space';
                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'IncDecRight');
                if ($fix === true) {
                    $phpcsFile->fixer
                        ->replaceToken($stackPtr + 1, '');
                }
                return;
            }
        }
        
        //end if
        // Check "!" operator.
        if ($tokens[$stackPtr]['code'] === T_BOOLEAN_NOT && $tokens[$stackPtr + 1]['code'] === T_WHITESPACE) {
            $error = 'A unary operator statement must not be followed by a space';
            $fix = $phpcsFile->addFixableError($error, $stackPtr, 'BooleanNot');
            if ($fix === true) {
                $phpcsFile->fixer
                    ->replaceToken($stackPtr + 1, '');
            }
            return;
        }
        // Find the last syntax item to determine if this is an unary operator.
        $lastSyntaxItem = $phpcsFile->findPrevious([
            T_WHITESPACE,
        ], $stackPtr - 1, $tokens[$stackPtr]['column'] * -1, true, null, true);
        $operatorSuffixAllowed = in_array($tokens[$lastSyntaxItem]['code'], [
            T_LNUMBER,
            T_DNUMBER,
            T_CLOSE_PARENTHESIS,
            T_CLOSE_CURLY_BRACKET,
            T_CLOSE_SQUARE_BRACKET,
            T_CLOSE_SHORT_ARRAY,
            T_VARIABLE,
            T_STRING,
            T_LINE,
        ]);
        // Check plus / minus value assignments or comparisons.
        if ($tokens[$stackPtr]['code'] === T_MINUS || $tokens[$stackPtr]['code'] === T_PLUS) {
            if ($operatorSuffixAllowed === false && $tokens[$stackPtr + 1]['code'] === T_WHITESPACE) {
                $error = 'A unary operator statement must not be followed by a space';
                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'PlusMinus');
                if ($fix === true) {
                    $phpcsFile->fixer
                        ->replaceToken($stackPtr + 1, '');
                }
            }
        }
    }
    
    //end process()

}