code: private void push(char c) throws JSONException {
  
          if (m_top >= MAXDEPTH) {
              throw new JSONException("Nesting too deep.");
          }
          m_stack[m_top] = c;
          m_mode = c;
          m_top += 1;
      }
docs: Push an array or object scope.<p>
  
  @param c the scope to open
  @throws JSONException if nesting is too deep