code: private void setIndentation(int length, boolean open) {
  
          if (open) {
              m_indent += length;
          } else {
              m_indent -= length;
              if (m_indent < 0) {
                  m_indent = 0;
              }
          }
      }
docs: Sets the indentation.<p>
  
  @param length the indentation length
  @param open if the indentation should be added or reduced