Delphi Programming

and software in general.

Friday, July 8, 2011

Weird code snippet #1: Pseudobinary case statement

Curt Carpenter suggested a language addition for handing binary case logic.

That gave me this idea. Chalk it up as another weird code snippet from yours truly.

///<summary>> Convert array of booleans to a pseudobinary integer. 
///Good for up to 12 bits.</summary>
function BoolToInt(B: Array of Boolean):Integer;
var
  x : Boolean;
begin
  Result := 0;
  for x in B
  do begin
    Result := Result * 10;
    if x then Inc(Result);
  end;
end;

procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
var
  ch : Char;
begin
  ch := Lowercase(Char(Key));
  case BoolToInt([ssShift in Shift, ssCtrl in Shift, ch='a', ch='x', ch='c', ch='v']) of
    011000: SelectAll;
    010100: Cut;
    010010: Copy;
    110010: Clone;
    010001: Paste;
  end;
end;


A slightly more tongue in cheek example:

procedure SexistTestLogic(const Cute, Funny, Smart: boolean);
begin
  case BoolToInt([Cute, Funny, Smart]) of
     000: Avoid;
     001: Admire;
     010,
     011: Befriend;
     100: Tolerate;
     101: HandleWithCare;
     110: Adore;
     111: Marry;
  end;
end;