ROT-13 преобразовать стандартный ввод

34

Задача: прочитать ввод произвольной длины и получить ROT13 ввода. Все символы, кроме AZ, должны быть дословно скопированы в выходной файл, и регистр должен быть сохранен, если это возможно.

Любой язык, который может читать и писать стандартные потоки, является честной игрой.

code-golf cryptography MiffTheFox
источник
3
Проблема не должна быть тегом, поэтому я удалил ROT13, просто к сведению
Ник Берарди
2
Разве вы не имеете в виду A-Za-z (чтобы считать как верхний, так и нижний регистр)?
Джои Адамс
5
@Chris Jester-Young, он принадлежит к этой категории в Википедии. Это часть криптографии, но не самая сложная. Во всяком случае, я больше не подписан на этот сайт. Сообщество разочаровало меня. Сожалею. GL HF.
Накилон
17
Сказать, что xor - это не шифрование, это все равно, что сказать, что a + b - это не математика .
Накилон
3
Теги используются для классификации вопросов и помощи в поиске похожих вопросов. Криптография тег (от греческого Kryptos, «скрытый, тайный», и graphein, «письма») , в частности , для шифрования и дешифрования проблем. Все шифрование и дешифрование, а не только те, которые безопасны для современных приложений.
Анг

Ответы:

25

Баш, 23 байта

Канонический 23-символьный ответ:

tr A-Za-z N-ZA-Mn-za-m
Chris Jester-Young
источник
1
I'm without access to bash at the moment, but I think this should work: tr A-za-m N-ZA-z (16 chars)
Nabb
2
@Nabb: Nice to see you, GolfScript-meister! :-D I think your solution here would break the stipulation that "All characters besides A-Z should be copied to the output verbatim".
Chris Jester-Young
@Chris: Yep, looks like you're right.
Nabb
@Nabb: No, to me it looks as if he's wrong. Or may you show an example?
user unknown
2
@user unknown: Type in [\\]^_` in the input. It will come back as NOPQRS rather than [\\]^_`, at least in the version of tr I have. (Those are the six characters in ASCII that lie between Z and a. Obviously, all other characters will work correctly.)
Chris Jester-Young
20

Bash - 5 chars

rot13

 

gnibbler
источник
18
Two downvotes so far (with no comments), but no downvotes for the question. I assume that means it's ok to ask trivial codegolfs but not to give the trivial answer. Harder codegolfs please!
gnibbler
8
Which bash-version? I don't have a build-in rot13. bash --version GNU bash, Version 4.0.33(1)-release (i486-pc-linux-gnu)
user unknown
12
I'd have submitted this as rot13 - 0 chars... ;)
boothby
2
'tis coreutils my friend, not Bash
TheDoctor
3
erm... no. my bash (Ubuntu 13.10) says "command not found, you can install this program by sudo apt-get install bsdgames"
17

Python 2, 34 bytes

print raw_input().encode('rot13')
Juan
источник
1
-1 I think it is cheating that you are using a built in library.
Glenn Nelson
16
I've used them in every code golf I took part in... Also if using python's standard lib is cheating, how is using tr not?
Juan
3
@Anon In any case, it's an anwser you just ignore.. It's not off target, there's not any rules set by the OP nor by the community. Sure, maybe mine is not an award winning solution, like the one using tr that kicks ass. But it's not a joke, I'm leveraging the power of python to reduce the count, just like any other would do.
Juan
2
@Glenn: on the contrary, I have never seen a code-golf thing that say so. Neither do codegolf.com, golf.shinh.org or SPOJ SHORTEN.
hallvabo
9
@Glenn, I think library functions are fair game. It's up to the golf question to be interesting enough to not be in anyone's library or to specifically exclude.
gnibbler
15

Befunge - 7x30 = 210 6x26 = 156 characters

New streaming version that supports both upper and lower case and should support unlimited input.

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

The old version

This stores the values inside its own source code. Really shows off how horrible it is to try and output stored values in the same order that you receive them. Only supports lowercase characters.

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

I'm not sure exactly what limitations this has, using http://www.quirkster.com/iano/js/befunge.html as the interpreter it does appear to break with large inputs.

Nemo157
источник
You can remove the whitespace at the end of lines.
Zacharý
10

Ruby - 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
источник
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
источник
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
источник
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
источник
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.
источник
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
источник
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
источник
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
источник
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
источник
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
источник
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
источник
3

Perl6 (54)

$*IN.lines».trans("a..zA..Z"=>"n..za..mN..ZA..M").say
Bruce Armstrong
источник
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
источник
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()]

источник
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
источник
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
источник
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
источник
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
источник
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
источник
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
MetaGolfScript is forbidden by a different rule
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
источник
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
источник
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))))
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                            (((lisp (lisp (lisp (lisp lisp))))
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                               (((lisp (lisp (lisp (lisp lisp))))
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                           (((lisp (lisp (lisp (lisp lisp)))) (lisp lisp))
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                           (((((lisp (lisp (lisp (lisp lisp))))
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                                   (((lisp (lisp (lisp (lisp lisp))))
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                                    (lisp (lisp (lisp lisp)))))
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                                      ((lisp (lisp (lisp lisp)))
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                                     (lisp (lisp (lisp lisp)))))
                                   (lisp lisp)))))
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                                   (lisp (lisp (lisp lisp)))))
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                                 (((lisp (lisp (lisp (lisp lisp))))
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                                  ((lisp (lisp (lisp lisp))) (lisp lisp))))))
                              (lisp (lisp (lisp lisp)))))
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                                  (((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))))))))
SYZYGY-DEV 333
источник
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
@JoKing oh I see. Maybe he was referring to this?
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
источник
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)

источник
1

K, 31

{x^(,/{x!(13_x),13#x}'.Q`A`a)x}
tmartin
источник
{x^a(,/-13 13#\:a:.Q.A)?x} for 26 bytes
streetster
1

Tcl, 74 chars

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