class UseLeadingBackslashSniff

class UseLeadingBackslashSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_USE,
        ];
    }
    
    //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 = $phpcsFile->getTokens();
        // Only check use statements in the global scope.
        if (empty($tokens[$stackPtr]['conditions']) === false) {
            return;
        }
        $startPtr = $phpcsFile->findNext(Tokens::$emptyTokens, $stackPtr + 1, null, true);
        if ($startPtr !== false && $tokens[$startPtr]['code'] === T_NS_SEPARATOR) {
            $error = 'When importing a class with "use", do not include a leading \\';
            $fix = $phpcsFile->addFixableError($error, $startPtr, 'SeparatorStart');
            if ($fix === true) {
                $phpcsFile->fixer
                    ->replaceToken($startPtr, '');
            }
        }
    }
    
    //end process()

}