4 ms·

Lord of the REPLs

80 points by mcantelon 18y ago

catch23 18y ago
damn, wanted to give it a whirl, but my ctrl-space was already bound to my quick-open
- mshafrir 18y ago
  "use the metacommand '/switch', for example '/switch clojure' to start coding in clojure"
  - catch23 18y ago
    sorry, I meant ctrl-enter (for evaluation)
- deleted 18y ago
  [deleted]
- bmunro 18y ago
  Click on the language name and a drop down menu will appear.
  - deleted 18y ago
    [deleted]
ewjordan 18y ago
First, a link direct to the REPL: http://lotrepls.appspot.com/ http://lotrepls.appspot.com/ The lack of state between evaluations for the non-Lisps is unfortunate, but this is still really neat, I hope it continues to improve. What I'd really like to see is a set of "Try Ruby"-ish interactive tutorials for each of the languages...
zmimon 18y ago
I think it's very interesting that Google is brave enough to put this app out there from a security point of view. They are letting any random stranger without registration etc., run code inside their sandbox. For example, switch to groovy mode and enter: println new URL('http://www.google.com' http://www.google.com').openConnection().inputStream.text You'll see it fetches the web page and prints it out. So this app is now an anonymous proxy, of sorts, using Google's bandwidth to hit other sites. Of course, that is just the first thing that came into my head, but it seems to me there might be many ways someone evil could use this either directly to do bad things or to try and hack the app engine sandbox itself.
- notaddicted 18y ago
  Yeah, there are probably lost of nasty things one could do. The first that comes to mind it to have the have the website open itself, re-insert the command, open itself, ad overflow. On the other hand, there are security holes in everything, and its a fun toy, so one might as well enjoy it while it lasts.
- markokocic 18y ago
  I suppose one of its goals is to test the sandbox itself for possible abuses, so that it could be fixed later. This is primarily intended to developers which are most likely to actually find a way to abuse the sandbox.
paraschopra 18y ago
I tested 'while(1): print "can it hang?"' on it. It didn't hang. It didn't print anything. Just threw java.lang.OutOfMemoryError: Java heap space
- calvin 18y ago
  I got errors testing basic "Hello World" scenarios, too.
  - blinks 18y ago
    In python, print "hello, world" works just fine.
- qiemem 18y ago
  Printing to standard output doesn't work. The only thing that prints are the values of the last evaluated expression it seems.
albertcardona 18y ago
Incidentally, we support clojure, jruby, jython, beanshell and javascript in Fiji, with a nice GUI interpreter and the ability to open GUI widgets. The JVM and the publicly available JVM-implementations of all these languages makes it easy. The lotrepl webpage, though, is a nice spin of the JVM language support. Reminds me of the much-more-powerful http://codepad.org http://codepad.org which supports C, C++, haskell, D, Lua, OCaml, and many others. (For Fiji see: http://pacific.mpi-cbg.de http://pacific.mpi-cbg.de , and in particular http://pacific.mpi-cbg.de/wiki/index.php/Scripting_Help http://pacific.mpi-cbg.de/wiki/index.php/Scripting_Help )

Lord of the REPLs

80 points by mcantelon 18y ago

catch23 18y ago

damn, wanted to give it a whirl, but my ctrl-space was already bound to my quick-open

mshafrir 18y ago
"use the metacommand '/switch', for example '/switch clojure' to start coding in clojure"
- catch23 18y ago
  sorry, I meant ctrl-enter (for evaluation)
deleted 18y ago
[deleted]
bmunro 18y ago
Click on the language name and a drop down menu will appear.
- deleted 18y ago
  [deleted]

ewjordan 18y ago

First, a link direct to the REPL: http://lotrepls.appspot.com/ http://lotrepls.appspot.com/ The lack of state between evaluations for the non-Lisps is unfortunate, but this is still really neat, I hope it continues to improve. What I'd really like to see is a set of "Try Ruby"-ish interactive tutorials for each of the languages...

zmimon 18y ago

I think it's very interesting that Google is brave enough to put this app out there from a security point of view. They are letting any random stranger without registration etc., run code inside their sandbox. For example, switch to groovy mode and enter: println new URL('http://www.google.com' http://www.google.com').openConnection().inputStream.text You'll see it fetches the web page and prints it out. So this app is now an anonymous proxy, of sorts, using Google's bandwidth to hit other sites. Of course, that is just the first thing that came into my head, but it seems to me there might be many ways someone evil could use this either directly to do bad things or to try and hack the app engine sandbox itself.

notaddicted 18y ago
Yeah, there are probably lost of nasty things one could do. The first that comes to mind it to have the have the website open itself, re-insert the command, open itself, ad overflow. On the other hand, there are security holes in everything, and its a fun toy, so one might as well enjoy it while it lasts.
markokocic 18y ago
I suppose one of its goals is to test the sandbox itself for possible abuses, so that it could be fixed later. This is primarily intended to developers which are most likely to actually find a way to abuse the sandbox.

paraschopra 18y ago

I tested 'while(1): print "can it hang?"' on it. It didn't hang. It didn't print anything. Just threw java.lang.OutOfMemoryError: Java heap space

calvin 18y ago
I got errors testing basic "Hello World" scenarios, too.
- blinks 18y ago
  In python, print "hello, world" works just fine.
qiemem 18y ago
Printing to standard output doesn't work. The only thing that prints are the values of the last evaluated expression it seems.

albertcardona 18y ago

Incidentally, we support clojure, jruby, jython, beanshell and javascript in Fiji, with a nice GUI interpreter and the ability to open GUI widgets. The JVM and the publicly available JVM-implementations of all these languages makes it easy. The lotrepl webpage, though, is a nice spin of the JVM language support. Reminds me of the much-more-powerful http://codepad.org http://codepad.org which supports C, C++, haskell, D, Lua, OCaml, and many others. (For Fiji see: http://pacific.mpi-cbg.de http://pacific.mpi-cbg.de , and in particular http://pacific.mpi-cbg.de/wiki/index.php/Scripting_Help http://pacific.mpi-cbg.de/wiki/index.php/Scripting_Help )