Fan.Sys.Uri.slice C# (CSharp) Method

        private Uri slice(Range range, bool forcePathAbs)
        {
            if (m_pathStr == null)
            throw Err.make("Uri has no path: " + this).val;

              int size = m_path.sz();
              int s = range.start(size);
              int e = range.end(size);
              int n = e - s + 1;
              if (n < 0) throw IndexErr.make(range).val;

              bool head = (s == 0);
              bool tail = (e == size-1);
              if (head && tail && (!forcePathAbs || isPathAbs())) return this;

              Sections t = new Sections();
              t.path = m_path.getRange(range);

              StringBuilder sb = new StringBuilder(m_pathStr.Length);
              if ((head && isPathAbs()) || forcePathAbs) sb.Append('/');
              for (int i=0; i<t.path.sz(); ++i)
              {
            if (i > 0) sb.Append('/');
            sb.Append(t.path.get(i));
              }
              if (t.path.sz() > 0 && (!tail || isDir())) sb.Append('/');
              t.pathStr = sb.ToString();

              if (head)
              {
            t.scheme   = m_scheme;
            t.userInfo = m_userInfo;
            t.host     = m_host;
            t.port     = m_port;
              }

              if (tail)
              {
            t.queryStr = m_queryStr;
            t.query    = m_query;
            t.frag     = m_frag;
              }
              else
              {
            t.query    = emptyQuery();
              }

              if (!head && !tail)
              {
            t.str = t.pathStr;
              }

              return new Uri(t);
        }