class DisallowMultipleStatementsSniff

class DisallowMultipleStatementsSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_SEMICOLON,
        ];
    }
    
    //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();
        $fixable = true;
        $prev = $stackPtr;
        do {
            $prev = $phpcsFile->findPrevious([
                T_SEMICOLON,
                T_OPEN_TAG,
                T_OPEN_TAG_WITH_ECHO,
                T_PHPCS_IGNORE,
            ], $prev - 1);
            if ($prev === false || $tokens[$prev]['code'] === T_OPEN_TAG || $tokens[$prev]['code'] === T_OPEN_TAG_WITH_ECHO) {
                $phpcsFile->recordMetric($stackPtr, 'Multiple statements on same line', 'no');
                return;
            }
            if ($tokens[$prev]['code'] === T_PHPCS_IGNORE) {
                $fixable = false;
            }
        } while ($tokens[$prev]['code'] === T_PHPCS_IGNORE);
        // Ignore multiple statements in a FOR condition.
        foreach ([
            $stackPtr,
            $prev,
        ] as $checkToken) {
            if (isset($tokens[$checkToken]['nested_parenthesis']) === true) {
                foreach ($tokens[$checkToken]['nested_parenthesis'] as $bracket) {
                    if (isset($tokens[$bracket]['parenthesis_owner']) === false) {
                        // Probably a closure sitting inside a function call.
                        continue;
                    }
                    $owner = $tokens[$bracket]['parenthesis_owner'];
                    if ($tokens[$owner]['code'] === T_FOR) {
                        return;
                    }
                }
            }
        }
        if ($tokens[$prev]['line'] === $tokens[$stackPtr]['line']) {
            $phpcsFile->recordMetric($stackPtr, 'Multiple statements on same line', 'yes');
            $error = 'Each PHP statement must be on a line by itself';
            $code = 'SameLine';
            if ($fixable === false) {
                $phpcsFile->addError($error, $stackPtr, $code);
                return;
            }
            $fix = $phpcsFile->addFixableError($error, $stackPtr, $code);
            if ($fix === true) {
                $phpcsFile->fixer
                    ->beginChangeset();
                $phpcsFile->fixer
                    ->addNewline($prev);
                if ($tokens[$prev + 1]['code'] === T_WHITESPACE) {
                    $phpcsFile->fixer
                        ->replaceToken($prev + 1, '');
                }
                $phpcsFile->fixer
                    ->endChangeset();
            }
        }
        else {
            $phpcsFile->recordMetric($stackPtr, 'Multiple statements on same line', 'no');
        }
        
        //end if
    }
    
    //end process()

}