class NamespaceSniff

class NamespaceSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_NAMESPACE,
        ];
    }
    
    //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]['content'] !== ' ') {
            $error = 'There must be exactly one space after the namespace keyword';
            $fix = $phpcsFile->addFixableError($error, $stackPtr + 1, 'OneSpace');
            if ($fix === true) {
                $phpcsFile->fixer
                    ->replaceToken($stackPtr + 1, ' ');
            }
        }
    }
    
    //end process()

}