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MetHorn

Br@inf*ck UNO Card Checker

MetHorn
Nov 23rd, 2019
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  1. This program is a modified solution to the
  2. Habitica Programming Challenge Guild
  3. November '19 challenge
  4.  
  5. It checks if one UNO hand card could be
  6. dropped onto the top card on the pile
  7.  
  8. Written by MetHorn
  9.  
  10. Tested with online BF interpreter at
  11. https://copy(dot)sh/brainfuck/
  12.  
  13. Input Registers:
  14. Register R0 and R1 = card value (0 to 9)
  15. Register R2 and R3 = color (g = green | r = red
  16. | n = blue | y = yellow)
  17.  
  18. Return values:
  19. 0 = Card can't be played
  20. 1 = Card can be played
  21.    
  22.    
  23. Lets start:
  24.    Init Flag in R4 to 1 = Card can be played
  25.    >>>>+<<<<
  26.  
  27.    Read hand card value to R0 and
  28.    increment pointer
  29.    ,>
  30.    
  31.    Read pile card value to R1 and inc p
  32.    ,>
  33.    
  34.    Read hand card color to R2 and inc p
  35.    ,>
  36.    
  37.    Read pile card color to R3
  38.    ,
  39.    
  40.    Pointer back to R1
  41.    <<
  42.    
  43.    Now lets compare the card values
  44.    [<->-] Decrement R0 and R1 until R1 is 0
  45.    < Back to R0
  46.    
  47.    [ This block is only executed if R0 != 0
  48.        Since the values are different check
  49.        the colors now
  50.        [-] R0 = 0
  51.        >>> Pointer to R3
  52.        [<->-] Decrement R2 and R3 until R3 is 0
  53.        < Back to R2
  54.        
  55.        [ This block is only executed if R2 != 0
  56.            The values and colors are both different
  57.            so the card in hand can't be played
  58.            We have to return ASCII '0' which is 48
  59.            Lets put 7*7-1 in R1
  60.            << Pointer to R0
  61.            [-] R0 =0
  62.            +++++++ R0 = 7
  63.            [>+++++++<-] R1 = R0 multiplied by 7
  64.            >- Subb 1 from R1
  65.            . Print R1
  66.            >>>-<< Reset Flag at R4 and
  67.            Pointer back to R2
  68.            [-] R2 = 0
  69.        ]
  70.        << Pointer to R0
  71.    ]
  72.    
  73.    >>>> Pointer to R4 (Flag Card can be played)
  74.    [ This block is only executed if R4 = 1
  75.        If cards have same value and/or same
  76.        color return 1
  77.        So we have to return ASCII '1' which is 49
  78.        Lets put 7*7 in R1
  79.        <<<< Pointer to R0
  80.        [-] R0 = 0
  81.        +++++++ R0 = 7
  82.        [>+++++++<-] R1 = R0 multiplied by 7
  83.        >. Print R1
  84.        < Pointer to R0
  85.    ]
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