def euler(x); cos(x) + i*sin(x); end

If my previous post about sirb got you drooling a bit, read on. I’ve added some simple command line arguments to sirb that enable you to request that s-expressions, assembly, or bytecodes (or all of them) are printed each time through the RCEPL loop. You can get a hint at all the goodness by passing the -h switch.

$ ./shotgun/rubinius apps/irb/sirb.rb -h -p -x -s -b
  Usage: sirb [options]
    sirb is a RCEPL (read, compile, execute, print, loop) program for rubinius

    Options: 
            -p   Print the parsed s-expression
            -x   Print the normalized s-expression.
            -s   Print assembly instructions.
            -b   Print bytecode encoding.

sirb(eval):0> puts "Hello, Rubinius. You rock my world!" 

S-exp:
[:newline, 1, "(eval)", [:fcall, :puts, [:array, [:str, "Hello, Rubinius. You rock my world!", 0]]]]

Normalized S-exp:
[:newline, 1, "(eval)", [:call, [:self], :puts, [:array, [:str, "Hello, Rubinius. You rock my world!", 0]]]]

Asm:
#line 1
push_literal 0
string_dup
push self
send puts 1
ret

Bytecodes:
"\v\000\000\000\000:\f)\000\000\000\001\000\000\000\001'\000\000\000" 
Hello, Rubinius. You rock my world!
=> nil
sirb(eval):1>

As I mentioned, sirb is rudimentary at the moment. But it shows you how much can be done with Rubinius right now. Swell! And, a big thanks to mae for fixing up how the output of the execution prints (no more ["foo"]).