code: static void getSingleRun(Bidi bidi, byte level) {
          /* simple, single-run case */
          bidi.runs = bidi.simpleRuns;
          bidi.runCount = 1;
  
          /* fill and reorder the single run */
          bidi.runs[0] = new BidiRun(0, bidi.length, level);
      }
docs: /* in trivial cases there is only one trivial run; called by getRuns()