Entrada padrão de transformação ROT-13

34

O desafio: Ler uma entrada de comprimento arbitrário e produzir o ROT13 da entrada. Todos os caracteres além de AZ devem ser copiados para a saída literalmente, e maiúsculas e minúsculas devem ser preservadas, se possível.

Qualquer idioma que possa ler e escrever fluxos padrão é um jogo justo.

code-golf  cryptography 
— MiffTheFox
fonte
3
O problema não deve ser um tag, então eu removido ROT13, apenas uma FYI
— Nick Berardi
2
Você não quer dizer A-Za-z (para contar maiúsculas e minúsculas)?
— Joey Adams
5
@ Chris Jester-Young, pertence a esta categoria na wikipedia. Faz parte da criptografia, mas não a mais difícil. De qualquer forma, não estou mais seguindo este site. A comunidade me decepcionou. Desculpe. GL HF.
— Nakilon
17
Dizer que xor não é criptografia é como dizer que a + b não é matemática .
— Nakilon
3
As tags são usadas para categorizar perguntas e ajudar a pesquisar perguntas semelhantes. A etiqueta de criptografia (do grego kryptós, "oculto, secreto"; e graphein, "escrita"), em particular, é para problemas de criptografia e descriptografia. Toda criptografia e descriptografia, não apenas aquelas que são seguras para aplicativos modernos.
— Angs

Respostas:

25

Bash, 23 bytes

Resposta canônica de 23 caracteres:

tr A-Za-z N-ZA-Mn-za-m
— Chris Jester-Young
fonte
1
Estou sem acesso à festa no momento, mas acho que isso deve funcionar: tr A-za-m N-ZA-z(16 caracteres)
— Nabb
2
@Nabb: Prazer em vê-lo, GolfScript-meister! : -DI acho que sua solução aqui quebraria a estipulação de que "todos os caracteres além de AZ devem ser copiados para a saída literalmente".
— Chris Jester-Young
@ Chris: Sim, parece que você está certo.
— Nabb
@Nabb: Não, para mim parece que ele está errado. Ou você pode mostrar um exemplo?
— usuário desconhecido
2
@ usuário desconhecido: Digite [\\]^_`a entrada. Ele vai voltar como NOPQRSem vez de [\\]^_`, pelo menos, na versão do trque eu tenho. (Esses são os seis caracteres de ASCII que se encontram entre Ze aObviamente, todos os outros personagens irá funcionar corretamente..)
— Chris Jester-Young
20

Bash - 5 caracteres

rot13

 

— mordedor
fonte
18
Até agora, dois votos negativos (sem comentários), mas nenhum voto negativo para a pergunta. Suponho que isso significa que não há problema em pedir codegolfs triviais, mas não para dar a resposta trivial. Codegolfs mais duros, por favor!
— gnibbler
8
Qual versão bash? Eu não tenho um rot13 embutido. bash --version GNU bash, Version 4.0.33(1)-release (i486-pc-linux-gnu)
— usuário desconhecido
12
Eu teria enviado isso como rot13 - 0 chars...;) #
— 11003
2
é coreutils meu amigo, não Bash
— TheDoctor 17/03
3
erm ... não. meu bash (Ubuntu 13.10) diz que "comando não encontrado, você pode instalar este programa sudo apt-get install bsdgames"
17

Python 2, 34 bytes

print raw_input().encode('rot13')
— Juan
fonte
1
-1 Acho que é trapaça você estar usando uma biblioteca embutida.
— Glenn Nelson
16
Eu os usei em todos os códigos de código nos quais participei ... Além disso, se o uso da lib padrão do python está trapaceando, como o uso do tr não está?
— Juan
3
@Anon De qualquer forma, é uma resposta que você simplesmente ignora. Não está fora do alvo, não há regras definidas pelo OP nem pela comunidade. Claro, talvez a minha não seja uma solução premiada, como a que usa tr que chuta a bunda. Mas não é brincadeira, estou aproveitando o poder do python para reduzir a contagem, como qualquer outro faria.
— Juan
2
@ Glenn: pelo contrário, nunca vi uma coisa de código de golfe que o dissesse. Nem codegolf.com, golf.shinh.org ou SPOJ SHORTEN.
— hallvabo
9
@ Glenn, acho que as funções da biblioteca são um jogo justo. Cabe à questão do golfe ser interessante o suficiente para não estar na biblioteca de ninguém ou excluir especificamente.
— gnibbler
15

Befunge - 7x30 = 210 6x26 = 156 caracteres

Nova versão de streaming compatível com maiúsculas e minúsculas e com entrada ilimitada.

v,<               <<     <
  ^-4-9<    >:"A"\`|
     >:"a"\`|     #>:"Z"`|
>~:0`| #    >:"z"`|
,    @ |    <`"m":<v`"M":<
^  +4+9<    ^      <

A versão antiga

Isso armazena os valores dentro de seu próprio código-fonte. Realmente mostra como é horrível tentar gerar valores armazenados na mesma ordem em que você os recebe. Suporta apenas caracteres minúsculos.

vp0p11:+1g11<      < <
v                    ^-4-9<
v    >:"a"\`|>:"z"`|>:"m"`|
>~:0`|      >^     >^#
                     ^+4+9<
     >$011g1+0p>12g1+:12p0g:v
               ^           ,_@

Não sei exatamente quais limitações isso tem, usando http://www.quirkster.com/iano/js/befunge.html como intérprete que parece romper com entradas grandes.

— Nemo157
fonte
Você pode remover o espaço em branco no final das linhas.
— Zacharý
10

Rubi - 60 57 38 37 chars

Edit: And just realised Ruby strings have a tr method.

puts$<.read.tr'A-Za-z','N-ZA-Mn-za-m'

Test

input = "The challenge: To read an input of arbitrary length and produce the ROT13 of the input. All characters besides A-Z should be copied to the output verbatim, and case should be preserved if possible.

Any language that can read and write standard streams is fair game."

output = `echo '#{input}' | ruby golf-rot13.rb`

puts "Input:"
puts input
puts "-------"
puts "Output:"
puts output

Gives:

Input:
The challenge: To read an input of arbitrary length and produce the ROT13 of the input. All characters besides A-Z should be copied to the output verbatim, and case should be preserved if possible.

Any language that can read and write standard streams is fair game.
-------
Output:
Gur punyyratr: Gb ernq na vachg bs neovgenel yratgu naq cebqhpr gur EBG13 bs gur vachg. Nyy punenpgref orfvqrf N-M fubhyq or pbcvrq gb gur bhgchg ireongvz, naq pnfr fubhyq or cerfreirq vs cbffvoyr.

Nal ynathntr gung pna ernq naq jevgr fgnaqneq fgernzf vf snve tnzr.
— Nemo157
fonte
You don't need the space after puts, and 'A-z' is a shortcut for 'A-Za-z'
— Ventero
1
@Ventro: Thanks, after a bit of testing it seems 'A-z' is actually 'A-Z[\]^_a-z', damn ascii having characters between Z` and a.
— Nemo157
1
Essentially the same but 35 characters: puts gets.tr'A-Za-z','N-ZA-Mn-za-m'.
— Michael Kohl
@Michael: Except gets only returns the first line, using $<.read reads until EOF. The question doesn't say anything about whether the input can contain new lines so I just erred on the side of caution.
— Nemo157
Fair enough, but since the exercise specification only mentioned "arbitrary length" but said nothing about newlines, I'd rather err on the side of brevity in codegolf ;-)
— Michael Kohl
10

vim, 5 keystrokes

Assuming normal mode and that the text is already written in the buffer:

ggg?G

Or, fallowing vimgolf's conventions:

g?GZZ

You can also invoke it as a terminal command, something like this:

$ vim -c 'norm g?G' -
< your text here ...
... multiple lines if you want ...
... terminate input with ctrl+D on a blank line >

I guess the latter would count as a "program" of 8 characters (norm g?G)

— daniero
fonte
norm g?G is short for normal g?G that makes 8 chars.
— Patrick Oscity
I think you can safely assume to start out on line 1, so the first gg can be left off. I would say 3 keystrokes when the file is open.
— Patrick Oscity
1
If we use vimgolf's conventions (you start in a vanilla vim having just opened the file, but need to save and quit) we also get 5 (g?GZZ).
— FireFly
7

C - 83 79 characters

main(c,b){while((c=getchar())>=0)b=c&96,putchar(isalpha(c)?b+1+(c-b+12)%26:c);}

Readable version:

#include <ctype.h>
#include <stdio.h>

int main(void)
{
    int c, base;

    while ((c = getchar()) >= 0) {
        if (isalpha(c)) {
            base = (c & 96) + 1; /* First letter of the upper or lower case. */
            c = base + (c - base + 13) % 26;
        }
        putchar(c);
    }

    return 0;
}
— Joey Adams
fonte
1
Are you including the headers you include in your count?
— JPvdMerwe
@JPvdMerwe: I didn't include any headers in the golfed version, nor did I need to.
— Joey Adams
You can use the coma operator before putchar to remove a pair of braces.
— Alexandru
Could you explain main(c,b)? It's the first time i see this.
— Alexandru
2
@Alexandru most C compilers support main with any parameters. Also, the original C standard defines that an argument with no type is an int. Thus you get to declare ints without actually writing int.
— Juan
7

Python (117 bytes)

Here's a Python version that avoids the rot13()-method.

import sys
print"".join([chr(x/32*32+1+(x%32+12)%26if 64<x<91or 96<x<123 else x)for x in map(ord,sys.stdin.read())])
— JPvdMerwe
fonte
raw_input returns one line not all input.
— Alexandru
you need to import sys and use sys.stdin.read().
— Alexandru
@Alexandru: will do
— JPvdMerwe
-2 bytes if you eliminate the [] to make the list comp a generator: tio.run/…
— connectyourcharger
7

tr/// solution in Perl (39 characters), boilerplate can be removed with -p:

while(<>){y/a-zA-Z/n-za-mN-ZA-M/;print}

Using -p (23 characters including the extra switch):

perl -pe'y/a-zA-Z/n-za-mN-ZA-M/'
— Anon.
fonte
Add 1 char for the p, but please remove the boilerplate!
— J B
7

R, 37 bytes

example("chartr");cat(rot(scan(,"")))

example("chartr") runs the examples for chartr, which includes the rot function, which is ROT13 by default....

— mnel
fonte
5

DC (111 108 for the dc itself)

Ok, here it is in (mostly) dc and some sed and od magic to get it into the right format for the code. If you don't count the input thing (echo -n MESSAGE |) it's 160 bytes:

od -An -t dC|sed 's/^\ *//;s/\ \{2,3\}/\n/g'|dc -e'[13+26%]sm[65-lmx65+]su[97-lmx97+]sl[96<b64<dPc]sa[91>c]sd[123>e]sb[lux]sc[llxdd]se[ddddlaxlrx]sy[?z0<y]dsrx'

As a point of interest, the dc programme itself is only a 108 bytes long, shorter than the non-library python version. It even preserves case and punctuation, and beats Javascript in the above submission! If only I could better parse the output of od, or better yet replace it altogether.

EDIT: It's worth noting that the question doesn't indicate a trailing new line 10P which saves me three further bytes.

EDIT 2: There's no specification for the format of the input, so I assume it's taken in as is convenient for my programme :P

— Hiato
fonte
5

Befunge-93, 85 (grid: 41x3=123)

This is an ancient question, but I thought I'd revive it to post a slightly nicer Befunge answer.

#v_~::" "/2%" "*-::"@"`!#v_"Z"#v`#!_1
v> "M"`2*1\-34*1+*+    1:>$!   _:"."-!#@_
>,^

You can test it here. Enter a single character at a time; it terminates upon entering a . character (you can change that by modifying the "." near the right side of the second row). Works with upper and lower case, as well as punctuation, and with no limit to input.

I don't expect this to get a ton of upvotes or anything, but I just wanted to demonstrate how awesome Befunge actually is that you can do a little better than the other answer.

I could probably make it even shorter in Befunge-98.

— Kasran
fonte
You can add my snippet from here to have an inline interpreter, if you want. :)
— Ingo Bürk
Ooh, I haven't really investigated snippets yet. I'll take a look, thanks!
— Kasran
This doesn't work if there is a space in the input. It goes into an infinite loop in the sequence >$! _ because you've got two zeros on the stack at that point when you are expecting a non-zero value.
— James Holderness
4

PHP - 103 98 80 characters

(not using str_rot13())

<?=preg_replace('#[a-zA-Z]#e','chr(($x=ord("\0"))-$x%32+1+($x%32+12)%26)',`cat`);
— Arnaud Le Blanc
fonte
4

Delphi, 110

var c:Char;begin repeat Read(c);Write(Chr(Ord(c)+(Ord(c in['A'..'M'])-Ord(c in['N'..'Z']))*13));until EOF;end.
— PatrickvL
fonte
var c:Char;begin repeat Read(c);Write(Chr(Ord(c)+(Ord(c in['A'..'M'])-Ord(c in['N'..'Z']))*13));until EOF;end. saves one character :)
— Wouter van Nifterick
@Wouter van Nifterick : Good spot! I'll update it accordingly
— PatrickvL
4

Haskell, 100 characters

a%b=([a..b]++)
main=interact$map$toEnum.((0%64$78%90$65%77$91%96$110%122$97%109$[123..])!!).fromEnum
— MtnViewMark
fonte
3

Java 251 chars

public class r{public static void main(String[] a){String s = a[0];for(int i=0;i<s.length();){char c=s.charAt(i++);if(c>='a'&&c<='m')c+=13;else if(c>='n'&&c<='z')c-= 13;else if(c>='A'&&c<='M')c+=13;else if(c>='A'&&c <='Z')c-=13;System.out.print(c);}}}
— Clyde Lobo
fonte
3

Python 3 (107)

Ok, I promise to stop answering this question now, but I felt compelled to beat the DC answer in Python. This probably reflects poorly on me as a person :).

import sys;[print(x.isalpha()and chr((ord(x)&96)+1+(ord(x)%32+12)%26)or x,end='')for x in sys.stdin.read()]
3

C: 69 68 characters

Alright, I know this thread is long dead, but I couldn't stand the (long) C-solution which doesn't even compile on Clang (but does on GCC).

main(c){putchar(isalpha(c=getchar())*((c|32)<110?13:-13)+c);main();}

It is probably almost still squeezable. It certainly was squeezable. And not only was it squeezable, it was possible to make it recursive.

— Fors
fonte
3

05AB1E, 13 12 bytes

Saved a byte thanks to robbie0630

ADu)øJD2äRJ‡

Try it online!

Explanation

ADu           # push lower-case and uppercase alphabet
   )øJ        # zip, flatten and join, producing aAbB..zZ
      D2äRJ   # split a copy in 2 pieces, reverse and join producing nNoO..mM
           ‡  # translate input by replacing members of the alphabet 
              # with the corresponding member of the rot-13 alphabet
              # implicitly display
— Emigna
fonte
I ran through this with --debug, and it seems like the ˜ is a no-op in this case and can be cut out.
— robbie
@robbie0630: True. No idea why I had that in. Thank you :)
— Emigna
2

PHP - 41 Characters

while($r=fgets(STDIN))echo str_rot13($r);
— ircmaxell
fonte
5
-1 for rep-whoring.
— Raynos
2

JavaScript 1.8, 106

alert(prompt().replace(/\w/g,function(c)String.fromCharCode(c.charCodeAt()+(c.toLowerCase()<'n'?13:-13))))

JavaScript, 115

alert(prompt().replace(/\w/g,function(c){return String.fromCharCode(c.charCodeAt()+(c.toLowerCase()<'n'?13:-13))}))

This solution solves the problem by adding 13 to the character code if the character in question is in the first half of the alphabet, or subtracting 13 if it's in the second half.

— Casey Chu
fonte
You can save 7 characters by replacing +(c.toLowerCase()<'n'?13:-13)) with -13+26*/[a-m]/i.test(c).
— Jacob
2

CHIQRSX9+, 1

R

You just have to use the right tool for the problem.
CHIQRSX9+ is Turing complete, and it can read and write from standard channels with C.

— Johannes Kuhn
fonte
5
@nyuszika7h The language was invented before this question was written, so it is valid.
— Johannes Kuhn
1
It's still one of the things it was invented for, though. Seems like cheating to me.
— nyuszika7h
7
@nyuszika7h And golfscript was invented to win in code-golf challenges. Do you think that is cheating too?
— Johannes Kuhn
2
@Mego It's hardly fair to apply those standards here when they were written a year after this answer.
— Doorknob
2
— Mego
2

C, 136 bytes

I have never felt like any of my solutions are good enough to post on here, but made this for fun, and figured that it will be my gateway drug into code golf.

#define z(x) c>=x&&c<x+13
#define q(w) c>=w&&c<w+13
main(c){for(;(c=getchar())>=0;putchar(z('A')||z('a')?c+13:q('M')||q('m')?c-13:c));}
— Tormyst
fonte
4
Welcome to Programming Puzzles and Code Golf Stack Exchange. Great first answer. And just for the record, we all feel that way sometimes, just know that anything that you create is "good enough" somewhere.
— GamrCorps
2
Everything here on PPCG is just for fun (or imaginary internet points) -- please, don't feel the work you've done to craft a solution isn't "good enough"
— cat
Thanks for all the support. I think posting something was all I needed to get my head in gear. I am going to try my hand at more of these challenges soon.
— Tormyst
2

Javascript, 177 bytes

This assumes that there are two functions, print and readLine:

f=String.fromCharCode;print(readLine().replace(/[a-z]/g,function(a){return f((a.charCodeAt(0)-84)%25+97);}).replace(/[A-Z]/g,function(a){return f((a.charCodeAt(0)-52)%25+65);}))
— jrtapsell
fonte
2

LispLisp (16,636)

I'm sorry.

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                      ((lisp (lisp (lisp lisp)))
                       ((lisp (lisp (lisp (lisp lisp))))
                        (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                         ((lisp (lisp (lisp lisp)))
                          ((((lisp (lisp (lisp (lisp lisp))))
                             (((lisp (lisp (lisp (lisp lisp))))
                               ((lisp (lisp (lisp lisp)))
                                (lisp (lisp (lisp (lisp lisp))))))
                              (lisp (lisp (lisp lisp)))))
                            (((lisp (lisp (lisp (lisp lisp))))
                              ((lisp (lisp (lisp lisp)))
                               (((lisp (lisp (lisp (lisp lisp))))
                                 (((lisp (lisp (lisp (lisp lisp))))
                                   ((lisp (lisp (lisp lisp)))
                                    (lisp (lisp (lisp (lisp lisp))))))
                                  (lisp (lisp (lisp lisp)))))
                                (((lisp (lisp (lisp (lisp lisp))))
                                  (((lisp (lisp (lisp (lisp lisp))))
                                    ((lisp (lisp (lisp lisp)))
                                     (lisp (lisp (lisp (lisp lisp))))))
                                   (lisp (lisp (lisp lisp)))))
                                 (lisp lisp)))))
                             ((((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                               (lisp lisp))
                              (((lisp (lisp (lisp (lisp lisp))))
                                (((lisp (lisp (lisp (lisp lisp))))
                                  ((lisp (lisp (lisp lisp)))
                                   (lisp (lisp (lisp (lisp lisp))))))
                                 (lisp (lisp (lisp lisp)))))
                               (lisp lisp)))))
                           ((lisp (lisp (lisp (lisp lisp))))
                            (((lisp (lisp (lisp (lisp lisp))))
                              ((lisp (lisp (lisp lisp)))
                               (lisp (lisp (lisp (lisp lisp))))))
                             (lisp (lisp (lisp lisp)))))))))))
                     (lisp (lisp (lisp lisp)))))))
                 ((((lisp (lisp (lisp (lisp lisp))))
                    (((lisp (lisp (lisp (lisp lisp))))
                      ((lisp (lisp (lisp lisp)))
                       (lisp (lisp (lisp (lisp lisp))))))
                     (lisp (lisp (lisp lisp)))))
                   (((lisp (lisp (lisp (lisp lisp))))
                     ((lisp (lisp (lisp lisp)))
                      (((lisp (lisp (lisp (lisp lisp))))
                        (((lisp (lisp (lisp (lisp lisp))))
                          ((lisp (lisp (lisp lisp)))
                           (lisp (lisp (lisp (lisp lisp))))))
                         (lisp (lisp (lisp lisp)))))
                       (((lisp (lisp (lisp (lisp lisp))))
                         (((lisp (lisp (lisp (lisp lisp))))
                           ((lisp (lisp (lisp lisp)))
                            (lisp (lisp (lisp (lisp lisp))))))
                          (lisp (lisp (lisp lisp)))))
                        (lisp lisp)))))
                    ((((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                      (lisp lisp))
                     (((lisp (lisp (lisp (lisp lisp))))
                       (((lisp (lisp (lisp (lisp lisp))))
                         ((lisp (lisp (lisp lisp)))
                          (lisp (lisp (lisp (lisp lisp))))))
                        (lisp (lisp (lisp lisp)))))
                      (lisp lisp)))))
                  (((lisp (lisp (lisp (lisp lisp))))
                    ((lisp (lisp (lisp lisp)))
                     ((lisp (lisp (lisp (lisp lisp))))
                      (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                       ((lisp (lisp (lisp lisp)))
                        (((lisp (lisp (lisp (lisp lisp))))
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                           (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                            ((lisp (lisp (lisp lisp)))
                             (lisp (lisp (lisp lisp)))))))
                         (((lisp (lisp (lisp (lisp lisp))))
                           (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                            ((lisp (lisp (lisp lisp)))
                             (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                              ((lisp (lisp (lisp lisp)))
                               ((lisp (lisp (lisp lisp))) (lisp lisp)))))))
                          ((lisp (lisp (lisp lisp)))
                           (((((lisp (lisp (lisp (lisp lisp))))
                               (((lisp (lisp (lisp (lisp lisp))))
                                 ((lisp (lisp (lisp lisp)))
                                  (lisp (lisp (lisp (lisp lisp))))))
                                (lisp (lisp (lisp lisp)))))
                              (((lisp (lisp (lisp (lisp lisp))))
                                ((lisp (lisp (lisp lisp)))
                                 (((lisp (lisp (lisp (lisp lisp))))
                                   (((lisp (lisp (lisp (lisp lisp))))
                                     ((lisp (lisp (lisp lisp)))
                                      (lisp (lisp (lisp (lisp lisp))))))
                                    (lisp (lisp (lisp lisp)))))
                                  (((lisp (lisp (lisp (lisp lisp))))
                                    (((lisp (lisp (lisp (lisp lisp))))
                                      ((lisp (lisp (lisp lisp)))
                                       (lisp (lisp (lisp (lisp lisp))))))
                                     (lisp (lisp (lisp lisp)))))
                                   (lisp lisp)))))
                               ((((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                                 (lisp lisp))
                                (((lisp (lisp (lisp (lisp lisp))))
                                  (((lisp (lisp (lisp (lisp lisp))))
                                    ((lisp (lisp (lisp lisp)))
                                     (lisp (lisp (lisp (lisp lisp))))))
                                   (lisp (lisp (lisp lisp)))))
                                 (lisp lisp)))))
                             (((lisp (lisp (lisp (lisp lisp))))
                               ((lisp (lisp (lisp lisp)))
                                ((lisp (lisp (lisp (lisp lisp))))
                                 (((lisp (lisp (lisp (lisp lisp))))
                                   (lisp lisp))
                                  ((lisp (lisp (lisp lisp))) (lisp lisp))))))
                              (lisp (lisp (lisp lisp)))))
                            (((((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
                               (lisp lisp))
                              (((lisp (lisp (lisp (lisp lisp))))
                                ((lisp (lisp (lisp lisp)))
                                 ((lisp (lisp (lisp (lisp lisp))))
                                  (((lisp (lisp (lisp (lisp lisp))))
                                    ((lisp (lisp (lisp lisp)))
                                     (lisp (lisp (lisp (lisp lisp))))))
                                   (((lisp (lisp (lisp (lisp lisp))))
                                     ((lisp (lisp (lisp lisp)))
                                      ((lisp (lisp (lisp (lisp lisp))))
                                       (lisp lisp))))
                                    (lisp (lisp (lisp lisp))))))))
                               (((lisp (lisp (lisp (lisp lisp))))
                                 ((lisp (lisp (lisp lisp)))
                                  ((lisp (lisp (lisp (lisp lisp))))
                                   ((lisp (lisp (lisp lisp)))
                                    (lisp (lisp (lisp lisp)))))))
                                (((lisp (lisp (lisp (lisp lisp))))
                                  (((lisp (lisp (lisp (lisp lisp))))
                                    ((lisp (lisp (lisp lisp)))
                                     (lisp (lisp (lisp (lisp lisp))))))
                                   (((lisp (lisp (lisp (lisp lisp))))
                                     ((lisp (lisp (lisp lisp)))
                                      (lisp (lisp (lisp lisp)))))
                                    (((lisp (lisp (lisp (lisp lisp))))
                                      (lisp lisp))
                                     (lisp lisp)))))
                                 ((lisp (lisp (lisp lisp)))
                                  ((lisp (lisp (lisp (lisp lisp))))
                                   (((lisp (lisp (lisp (lisp lisp))))
                                     ((lisp (lisp (lisp lisp)))
                                      (lisp (lisp (lisp (lisp lisp))))))
                                    (lisp (lisp (lisp lisp))))))))))
                             ((lisp (lisp (lisp lisp))) (lisp lisp))))))))))))
                   (lisp (lisp (lisp lisp))))))))))))
          (lisp lisp))))
       (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
        ((lisp (lisp (lisp lisp)))
         (lisp (lisp (lisp lisp))))))))))
  (((lisp (lisp (lisp (lisp lisp))))
    (((lisp (lisp (lisp (lisp lisp))))
      ((lisp (lisp (lisp lisp)))
       (lisp (lisp (lisp (lisp lisp))))))
     (((lisp (lisp (lisp (lisp lisp))))
       ((lisp (lisp (lisp lisp)))
        (lisp (lisp (lisp lisp)))))
      (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
       (lisp lisp)))))
   ((lisp (lisp (lisp lisp)))
    (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
     ((lisp (lisp (lisp lisp)))
      ((lisp (lisp (lisp lisp))) (lisp lisp))))))))
— SYZYGY-DEV 333
fonte
Is this an actual language with an implementation? If so, can you please link to it?
— Jo King
@JoKing Wikipedia TIO
— Benjamin Urquhart
@BenjaminUrquhart Yes, Lisp is a language. Lisplisp however, I have found no evidence exists
— Jo King
— Benjamin Urquhart
1
Here's a translator to LazyK (Itself simply an implementation of the SKI Combinator Calculus). gist.github.com/SYZYGY-DEV333/d74ca36b9a4c504b25c0a2380203c98d
— SYZYGY-DEV 333
2

8086 Machine Code, 27 bytes

Unassembled:

        STLOOP:
AC          LODSB               ; load byte from SI into AL, advance SI 
8B D0       MOV  DX, AX         ; save original char in DL 
0C 20       OR   AL, 020H       ; lowercase the char 
3C 61       CMP  AL, 'a'        ; is char less than 'a'? 
7C 0F       JL   STCHR          ; if so, do not rotate 
3C 7A       CMP  AL, 'z'        ; is char greater than 'z'? 
7F 0B       JG   STCHR          ; if so, do not rotate 
B6 0D       MOV  DH, 'n'-'a'    ; add or subtract 13 
3C 6E       CMP  AL, 'n'        ; is char less than 'n'? 
7C 02       JL   ADD13          ; if so, add positive 13 
F6 DE       NEG  DH             ; otherwise add -13 
        ADD13:
92          XCHG AX, DX         ; original char back to AL 
02 C4       ADD  AL, AH         ; add 13 or -13 to original char
        STCHR:
AA          STOSB               ; store converted byte into DI, advance DI 
E2 E5       LOOP STLOOP         ; continue loop through string

Input string in SI, length in CX. Output string buffer at DI.

Test IBM PC DOS program output:

enter image description here

Download R13.COM test program (PC DOS).

— 640KB
fonte
1

Haskell - 112 characters

r l=drop 13 l++take 13 l
t=['a'..'z']
s=['A'..'Z']
main=interact$map(\x->maybe x id$lookup x$zip(t++s)$r t++r s)
1

Tcl, 74 chars

package require [set c tcl::transform::rot];$c 13 stdin;fcopy stdin stdout
— Johannes Kuhn
fonte
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