ruby-on-vimperator.js

Components.utils.import("resource://gre/modules/ctypes.jsm");

let RUBYLIB_DEF = {
  ruby_init: [ctypes.void_t],
  rb_eval_string_protect: [ctypes.uint32_t, ctypes.string, ctypes.uint32_t],
};

let rubydll = ctypes.open('msvcrt-ruby18.dll');
let ruby = {};
for (let [name, def] in Iterator(RUBYLIB_DEF))
  ruby[name] = rubydll.declare.apply(rubydll, [name, ctypes.default_abi].concat(def));

ruby.ruby_init();
let rbResult =
  ruby.rb_eval_string_protect(
    <>
      666
    </>.toString(),
    0
  );

// 返値が (Fixnum|true|false|nil) ならば、簡単な操作で答えが得られる。
// それ以外は普通には受け取れないかも。
function fromRb ()
  ({
    0: function() false,
    2: function() true,
    4: function() null,
    __noSuchMethod__: function (name) (parseInt(name) >> 1)
  })[rbResult]();
liberator.echo(fromRb(rbResult));

rubydll.close();