class CompoundNamespaceDepthSniff

class CompoundNamespaceDepthSniff implements Sniff {
    
    /**
     * The max depth for compound namespaces.
     *
     * @var integer
     */
    public $maxDepth = 2;
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_OPEN_USE_GROUP,
        ];
    }
    
    //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) {
        $this->maxDepth = (int) $this->maxDepth;
        $tokens = $phpcsFile->getTokens();
        $end = $phpcsFile->findNext(T_CLOSE_USE_GROUP, $stackPtr + 1);
        if ($end === false) {
            return;
        }
        $depth = 1;
        for ($i = $stackPtr + 1; $i <= $end; $i++) {
            if ($tokens[$i]['code'] === T_NS_SEPARATOR) {
                $depth++;
                continue;
            }
            if ($i === $end || $tokens[$i]['code'] === T_COMMA) {
                // End of a namespace.
                if ($depth > $this->maxDepth) {
                    $error = 'Compound namespaces cannot have a depth more than %s';
                    $data = [
                        $this->maxDepth,
                    ];
                    $phpcsFile->addError($error, $i, 'TooDeep', $data);
                }
                $depth = 1;
            }
        }
    }
    
    //end process()

}