code: public static Indentation spaces(int width, int level) {
          if (width < 0) width = DEFAULT.ch == ' ' ? DEFAULT.width : 4;
          return width == 0 ? NONE
                  : width == 2 && level < TWO_SPACES.length ? TWO_SPACES[level > 0 ? level : 0]
                  : width == 4 && level < FOUR_SPACES.length ? FOUR_SPACES[level > 0 ? level : 0]
                  : new Indentation(width, ' ', level);
      }
docs: Returns an indentation of <code>width</code> spaces, initially indented at
  <code>width * level</code> spaces.
  This indentation increases or decreases by <code>width</code> spaces at a time.
  
  @param width The number of spaces for a single indentation level (often 2 or 4).
  @param level The current indentation level (multiply this with the width for the initial number of spaces).
  @return The indentation level as <code>level</code> multiples of <code>width</code> spaces.