This is a Ruby program that generates Scala program that generates Scheme program that generates ...(through 50 languages)... REXX program that generates the original Ruby code again.
You are fortunate if you are using Ubuntu 13.04 (Raring Ringtail). You just have to type the following apt-get command to install all of them.
$ apt-get install algol68g bash beef boo clisp clojure1.4 coffeescript \
fp-compiler g++ gauche gawk gcc gforth gfortran ghc gnat gnu-smalltalk \
gobjc golang groovy icont intercal iverilog jasmin-sable llvm lua5.2 \
make mono-devel mono-mcs nodejs ocaml octave open-cobol openjdk-6-jdk \
parrot perl php5-cli pike7.8 python r-base regina-rexx ruby1.9.3 scala \
swi-prolog tcl8.5 ucblogo valac
If you are not using Ubuntu, please find your way yourself. If you could do it, please let me know. Good luck.
$ ruby QR.rb > QR.scala
$ scalac QR.scala && scala QR > QR.scm
$ gosh QR.scm > QR.bash
$ bash QR.bash > QR.st
$ gst QR.st > QR.tcl
$ tclsh QR.tcl > QR.unl
$ ruby unlambda.rb QR.unl > QR.vala
$ valac QR.vala && ./QR > QR.v
$ iverilog -o QR QR.v && ./QR -vcd-none > QR.ws
$ ruby whitespace.rb QR.ws > QR.adb
$ gnatmake QR.adb && ./QR > QR.a68
$ a68g QR.a68 > QR.awk
$ awk -f QR.awk > QR.boo
$ booi QR.boo > QR.bf
$ beef QR.bf > QR.c
$ gcc -o QR QR.c && ./QR > QR.cpp
$ g++ -o QR QR.cpp && ./QR > QR.cs
$ mcs QR.cs && mono QR.exe > QR.clj
$ clojure QR.clj > QR.cob
$ cobc -x QR.cob && ./QR > QR.coffee
$ coffee QR.coffee > QR.lisp
$ clisp QR.lisp > QR.fs
$ gforth QR.fs > QR.f
$ gfortran -o QR QR.f && ./QR > QR.f90
$ gfortran -o QR QR.f90 && ./QR > QR.go
$ go run QR.go > QR.groovy
$ groovy QR.groovy > QR.hs
$ runghc QR.hs > QR.icn
$ icont -s QR.icn && ./QR > QR.i
$ ick -b QR.i && ./QR > QR.j
$ jasmin QR.j && java QR > QR.java
$ javac QR.java && java QR > QR.ll
$ llvm-as QR.ll && lli QR.bc > QR.logo
$ ucblogo QR.logo > QR.lua
$ lua QR.lua > QR.makefile
$ make -f QR.makefile > QR.il
$ ilasm QR.il && mono QR.exe > QR.js
$ nodejs QR.js > QR.m
$ gcc -o QR QR.m && ./QR > QR.ml
$ ocaml QR.ml > QR.octave
$ octave -qf QR.octave > QR.pasm
$ parrot QR.pasm > QR.pas
$ fpc QR.pas && ./QR > QR.pl
$ perl QR.pl > QR.php
$ php QR.php > QR.pike
$ pike QR.pike > QR.prolog
$ swipl -q -t qr -f QR.prolog > QR.py
$ python QR.py > QR.R
$ R --slave < QR.R > QR.rexx
$ rexx ./QR.rexx > QR2.rb
You will see that QR.rb is the same as QR2.rb.
$ diff QR.rb QR2.rb
Alternatively, just type make.
$ make
Note: It may require huge memory to compile some files. According to some reports, 2 GB memory is not enough. I believe that it will work on 4 GB memory, though it depends on a platform. Please enable swap if you have not enough memory.
As I said above, I tested the program on Ubuntu. It does not provide Unlambda and Whitespace interpreters, so this repository includes my own implementations. For other languages, I used the following deb packages:
| language | ubuntu package | version |
|---|---|---|
| Ruby | ruby1.9.3 | 1.9.3.194-8.1ubuntu1.1 |
| Scala | scala | 2.9.2+dfsg-1 |
| Scheme | gauche | 0.9.3.3-8 |
| Shell | bash | 4.2-5ubuntu3 |
| Smalltalk | gnu-smalltalk | 3.2.4-2 |
| Tcl | tcl8.5 | 8.5.13-1ubuntu4 |
| Unlambda | (none) | - |
| Vala | valac | 0.18.1-0ubuntu4 |
| Verilog | iverilog | 0.9.6-1 |
| Whitespace | (none) | - |
| Ada | gnat | 4.6ubuntu1 |
| ALGOL68 | algol68g | 2.4.1-1 |
| Awk | gawk | 1:4.0.1+dfsg-2ubuntu1 |
| Boo | boo | 0.9.5~git20110729.r1.202a430-2 |
| Brainfuck | beef | 0.0.6-2 |
| C | gcc | 4:4.7.3-1ubuntu10 |
| C++ | g++ | 4:4.7.3-1ubuntu10 |
| C# | mono-mcs | 2.10.8.1-5ubuntu1 |
| Clojure | clojure1.4 | 1.4.0+dfsg-2ubuntu2 |
| Cobol | open-cobol | 1.1-1 |
| CoffeeScript | coffeescript | 1.4.0-1 |
| CommonLisp | clisp | 1:2.49-8.1ubuntu1 |
| Forth | gforth | 0.7.0+ds2-0.1 |
| FORTRAN77 | gfortran | 4:4.7.3-1ubuntu10 |
| Fortran90 | gfortran | 4:4.7.3-1ubuntu10 |
| Go | golang | 2:1.0.2-2 |
| Groovy | groovy | 2.0.0~beta2+isreally1.8.6-0ubuntu1 |
| Haskell | ghc | 7.6.2-1ubuntu1 |
| Icon | icont | 9.4.3-4 |
| INTERCAL | intercal | 29:0.29-2 |
| Jasmin | jasmin-sable | 2.4.0-1ubuntu1 |
| Java | openjdk-6-jdk | 6b27-1.12.5-1ubuntu1 |
| LLVM asm | llvm | 1:3.2-16~exp1 |
| Logo | ucblogo | 5.5-2.1 |
| Lua | lua5.2 | 5.2.1-3 |
| Makefile | make | 3.81-8.2ubuntu2 |
| MSIL | mono-devel | 2.10.8.1-5ubuntu1 |
| NodeJS | nodejs | 0.6.19~dfsg1-5ubuntu1 |
| Objective-C | gobjc | 4:4.7.3-1ubuntu10 |
| OCaml | ocaml | 3.12.1-2ubuntu3 |
| Octave | octave | 3.6.4-1 |
| Parrot asm | parrot | 4.6.0-1 |
| Pascal | fp-compiler | 2.6.0-9 |
| Perl | perl | 5.14.2-21 |
| PHP | php5-cli | 5.4.9-4ubuntu2.1 |
| Pike | pike7.8 | 7.8.352-dfsg-7ubuntu1 |
| Prolog | swi-prolog | 5.10.4-5ubuntu1 |
| Python | python | 2.7.4-0ubuntu1 |
| R | r-base | 2.15.2-1ubuntu1 |
| REXX | regina-rexx | 3.6-2 |
$ cd src
$ rake
Copyright (c) 2013 Yusuke Endoh (@mametter), @hirekoke
MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.