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BrainFuck part 7 - Quine (+ some non-BF quine theory)

DPAmar
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Previous: 2-step-quines

2-step-BF quine

Let's do the same, in BF

Skeleton 1

>>>>                               leave 4 cells
memory area part 1
>                                  array separator
memory area part 2
++++++++[->++++++++<]>--....[-]    print (62) 4 times
<<[<]<[<]<                         go two cells before first array
<++++++++[->+++++>++++++++<<]      generate 40 and 64
>+++>-->                           then 43 and 62 and got to first data cell
[[-<<<+>.>>]<.[->+<]<[->+<]>>>]    do the memcopy for array 1
<[[->+<]<]>>>.>                    prepare (43) and (62) for second array and print the (62) between the 2 parts
[[-<<<+>.>>]<.[->+<]<[->+<]>>>]    do the memcopy for array 2
<<<<<[<]>                          go to array2 first cell
[.>]                               print array2 chars

Skeleton 2

>>>>                               leave 4 cells
memory area part 1
>                                  array separator
memory area part 2
++++++++[->++++++++<]>--....[-]    print (62) 4 times
<<[<]<[<]<                         go two cells before first array
<++++++++[->+++++>++++++++<<]      generate 40 and 64
>+++>-->                           then 43 and 62 and got to first data cell
[[-<<<+>.>>]<.[->+<]<[->+<]>>>]    do the memcopy for array 1
<[[->+<]<]>>>.>                    prepare (43) and (62) for second array and print the (62) between the 2 parts
[[-<<<+>.>>]<.[->+<]<[->+<]>>>]    do the memcopy for array 2
<<<<<[<]<[<]>                      go to array1 first cell
[.>]                               print array1 chars

We can see that ony a very few chars are different... It would be a real waste to have huge memory areas for parts 1 and 2, while we could have 3 parts : a first common part, then the 2 different ones !

Here are the 2 new skeletons

Skeleton 1

>>>>>                              leave 5 cells
memory area common
>                                  array separator
memory area part 1
>                                  array separator
memory area part 2
++++++++[->++++++++<]>--....[-]    print (62) 4 times (5th will be factorized with array separators to loop on mem areas)
<<[<]<[<]<[<]<                     go two cells before first array
<++++++++[->+++++>++++++++<<]      generate 40 and 64
>+++>-->                           then 43 and 62 and got to first data cell
[<.                                for each memarea print (62) number 5 or array separator
  >[[-<<<+>.>>]<.[->+<]<[->+<]>>>] memcopy of current memarea
  <[[->+<]<]>>>>                   move 43 and 62
]                                  process next memcopy
<<<<<[[<]<]>>                      go to first memarea (no matter how many they are)
[.>]                               print first memarea
>[>]>[.>]                          print third memarea

Skeleton 2

>>>>>                              leave 5 cells
memory area common
>                                  array separator
memory area part 1
>                                  array separator
memory area part 2
++++++++[->++++++++<]>--....[-]    print (62) 4 times (5th will be factorized with array separators to loop on mem areas)
<<[<]<[<]<[<]<                     go two cells before first array
<++++++++[->+++++>++++++++<<]      generate 40 and 64
>+++>-->                           then 43 and 62 and got to first data cell
[<.                                for each memarea print (62) number 5 or array separator
  >[[-<<<+>.>>]<.[->+<]<[->+<]>>>] memcopy of current memarea
  <[[->+<]<]>>>>                   move 43 and 62
]                                  process next memcopy
<<<<<[[<]<]>>                      go to first memarea (no matter how many they are)
[.>]                               print first memarea
>[.>]                              print second memarea

Only the last few chars change... all mem areas can now be generated using the same memory generator tool implemented earlier

  • common area : from end of memory area part 2 to print first memarea
  • 1st specific part : second skeleton, last line
  • 2nd specific part : first skeleton, last line

Final 2-step-quine

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[-<<<+>.>>]<.[->+<]<[->+<]>>>]<[[->+<]<]>>>>]<<<<<[[<]<]>>[.>]>[.>]

Note remove all carriage returns prio to execution, added on cosmetic purpose.

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