[Oberon] PO2013 - MasterMind

[Tomas Kral]

Hi,

Oberon is not exactly a gaming platform, yet I am
recoding `MasterMind' game for PO2013 FPGA system.

In the Score procedure, I use two sets {u,s} to mark pegs already
scored. I was surprised two are needed, possibly one might be enough,
as they do not seem disjoint.

    (*peg is placed in each hole*)
    i := row*8 + peg; s := {}; complete := TRUE;
    FOR j := 0 TO pegs-1 DO
      o := DLogs.ThisId(i); t := o(DShape.Item);
      IF  ~t.fill THEN complete := FALSE END;
      guess[j] := t.col; INC(i)
      (*Out.Int(t.id, 3); Out.Bool(t.fill); Out.Ln*)
    END;

    (*pegs of the right color and correct position*)
    i := row*8 + key; blacks := 0;
    FOR j := 0 TO pegs-1 DO
      IF guess[j] = code[j] THEN
        o := DLogs.ThisId(i); t := o(DShape.Item);
        DShape.Key(t, Black); INC(blacks);
        INC(i); INCL(s, j)
      END
    END;

    (*pegs of the right color and wrong position*)
    u := s; whites := 0;
    FOR j := 0 TO pegs-1 DO
      IF ~(j IN s) THEN
        done := FALSE; k := 0;
        REPEAT
          IF ~(k IN u) & (guess[j] = code[k]) THEN
            o := DLogs.ThisId(i); t := o(DShape.Item);
            DShape.Key(t, White); INC(whites);
            INC(i); INCL(u, k);
            done := TRUE
          END ; INC(k)
        UNTIL done OR (k = pegs)
      END
    END;

-- 
Tomas Kral <thomas.kral at email.cz>
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