class ObjectOperatorSpacingSniff

class ObjectOperatorSpacingSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_OBJECT_OPERATOR,
        ];
    }
    
    //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 = $phpcsFile->getTokens();
        if ($tokens[$stackPtr - 1]['code'] !== T_WHITESPACE) {
            $before = 0;
        }
        else {
            if ($tokens[$stackPtr - 2]['line'] !== $tokens[$stackPtr]['line']) {
                $before = 'newline';
            }
            else {
                $before = $tokens[$stackPtr - 1]['length'];
            }
        }
        if ($tokens[$stackPtr + 1]['code'] !== T_WHITESPACE) {
            $after = 0;
        }
        else {
            if ($tokens[$stackPtr + 2]['line'] !== $tokens[$stackPtr]['line']) {
                $after = 'newline';
            }
            else {
                $after = $tokens[$stackPtr + 1]['length'];
            }
        }
        $phpcsFile->recordMetric($stackPtr, 'Spacing before object operator', $before);
        $phpcsFile->recordMetric($stackPtr, 'Spacing after object operator', $after);
        $prevToken = $phpcsFile->findPrevious(Tokens::$emptyTokens, $stackPtr - 1, null, true);
        // Line breaks are allowed before an object operator.
        if ($before !== 0 && $tokens[$stackPtr]['line'] === $tokens[$prevToken]['line']) {
            $error = 'Space found before object operator';
            $fix = $phpcsFile->addFixableError($error, $stackPtr, 'Before');
            if ($fix === true) {
                $phpcsFile->fixer
                    ->replaceToken($stackPtr - 1, '');
            }
        }
        if ($after !== 0) {
            $error = 'Space found after object operator';
            $fix = $phpcsFile->addFixableError($error, $stackPtr, 'After');
            if ($fix === true) {
                if ($after === 'newline') {
                    // Delete the operator on this line and insert it before the
                    // token on the next line.
                    $phpcsFile->fixer
                        ->beginChangeset();
                    $phpcsFile->fixer
                        ->replaceToken($stackPtr, '');
                    $phpcsFile->fixer
                        ->addContentBefore($stackPtr + 2, '->');
                    $phpcsFile->fixer
                        ->endChangeset();
                }
                else {
                    $phpcsFile->fixer
                        ->replaceToken($stackPtr + 1, '');
                }
            }
        }
    }
    
    //end process()

}