Proof of concept for making all ruby available to javascript.

allruby.rb

require 'v8'
require 'openssl'


class Module
  def [](name)
    self.const_get(name)
  end
end

class RubyTopLevel
  def [](constant)
    Object.const_get(constant)
  end
end

V8::Context.new do |cxt|
  cxt['Ruby'] = RubyTopLevel.new
  cxt.eval('var cipher = new Ruby.OpenSSL.Cipher("aes-128-cbc")')
  cxt.eval('cipher.decrypt')
  puts cxt['cipher'] #=> #<OpenSSL::Cipher:0x1015c7f40>
end

You can safely replace eval("::#{constant}") with Object.const_get(constant).

@judofyr:

const_get can't handle namespaced constants, whereas eval can. You can do it recursively using Object#const_get, splitting the string on '::' and then "walking" down the constants, calling const_get on each in turn though.

Foo = Class.new
Bar = Class.new(Foo)

const = "Foo::Bar"
eval(const) # => Bar
Object.const_get(const) # => NameError: "wrong constant name Foo::Bar"

@caius: in this case it will work because it will be invoked only with top level constants, hence RubyTopLevel.

Hmm, true. Hadn't looked at the original code for the use of eval("::#{constant}"), was just pointing out the two aren't the same.

General solution to this problem:

"Foo::Bar".split("::").inject(Object) { |m, e| m.const_get(e) }