Ironruby core - Jan 2011 - Accessing a Module's Classes from C# with dynamic

Hey guys.

I am currently experimenting with IronRuby as an extensibility solution
for my application. However, I have hit a roadblock. What I would like
to do is call Runtime.UseFile("script.rb"), then access a global
module
in the script, and instantiate a specific class in that module.



Here is the script file for reference:
module RbScriptApp
    class Foo
        def Bar()
            return (rand(100) + 1).to_s();
        end
    end
end



Initially, I thought it would be as easy as typing
dynamic globals = myRuntime.Globals;
dynamic myClass = globals.RbScriptApp.Foo. at new();
myClass.Bar();
...

but I soon found out this was not the case, as the builtin RubyModule
class does not support this dynamic syntax. Is there a way around this
or is it just plain impossible? I was unable to find *any* information
about how to do this (not even about RubyModule itself!) through Google.

The exception in question is a RuntimeBinderException:
''IronRuby.Builtins.RubyModule'' does not contain a definition
for ''Foo''

Right now my workaround is a call to EnumerateConstants and manual
lookup of the class name I want, but it doesn''t have the syntactic
elegance of the dynamic keyword... Any thoughts?

Thanks.

-- 
Posted via http://www.ruby-forum.com/.

It turns out that the problem is not accessing a module''s class, but
accessing the contents of a module in a require''d file.

global.rb
  require ''app''

app.rb
  module RbScriptApp
      class Foo
          def Bar()
              return (rand(100) + 1).to_s()
          end
      end
  end

No matter what I do I can only access RbScriptApp and not Foo if I call
Runtime.UseFile("global.rb"). So far I have two other work arounds:
1.)
create wrapper methods for everything I want to access in app.rb (ugh),
or 2.) use Engine.Execute("RbScriptApp::Foo.new"). The latter is more
preferrable, I suppose, but it seems strange that I can''t access Foo by
dynamic.

Any more information about this issue would be very helpful and
appreciated.

-- 
Posted via http://www.ruby-forum.com/.

On Jan 15, 2011, at 2:55 AM, Joshua M. wrote:
> No matter what I do I can only access RbScriptApp and not Foo if I call
> Runtime.UseFile("global.rb"). So far I have two other work
arounds: 1.)
> create wrapper methods for everything I want to access in app.rb (ugh),
> or 2.) use Engine.Execute("RbScriptApp::Foo.new"). The latter is
more
> preferrable, I suppose, but it seems strange that I can''t access
Foo by
> dynamic.
That''s how Modules work in Ruby. Just like namespaces in C#.

Try adding 

include RbScriptApp

to your global.rb file. You need to include the Module if you want to access the
class without qualifying it.

> Any more information about this issue would be very helpful and
> appreciated.
> 
> -- 
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core
--
Will Green
will at hotgazpacho.org

Another option would be 

RbScriptApp.const_get("Foo")

I haven''t tried that, but I think it should work. Neither solution is
indeed ideal. CLR interop with Modules isn''t quite polished yet.

Tomas

-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at
rubyforge.org] On Behalf Of Joshua M.
Sent: Friday, January 14, 2011 11:55 PM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Accessing a Module''s Classes from C# with
dynamic

It turns out that the problem is not accessing a module''s class, but
accessing the contents of a module in a require''d file.

global.rb
  require ''app''

app.rb
  module RbScriptApp
      class Foo
          def Bar()
              return (rand(100) + 1).to_s()
          end
      end
  end

No matter what I do I can only access RbScriptApp and not Foo if I call
Runtime.UseFile("global.rb"). So far I have two other work arounds:
1.) create wrapper methods for everything I want to access in app.rb (ugh), or
2.) use Engine.Execute("RbScriptApp::Foo.new"). The latter is more
preferrable, I suppose, but it seems strange that I can''t access Foo by
dynamic.

Any more information about this issue would be very helpful and appreciated.

--
Posted via http://www.ruby-forum.com/.
_______________________________________________
Ironruby-core mailing list
Ironruby-core at rubyforge.org
http://rubyforge.org/mailman/listinfo/ironruby-core

>You need to include the Module if you want to
>access the class without qualifying it.
I have tried this but it doesn''t work (RuntimeBinderException:
''Microsoft.Scripting.Hosting.ScriptScope'' does not contain a
definition
for ''Foo'').

In my original post I had specified the fully qualified name.
>RbScriptApp.const_get("Foo")
InvalidOperationException: Empty scope has no global scope.
>I haven''t tried that, but I think it should work. Neither solution
is
>indeed ideal. CLR interop with Modules isn''t quite polished yet.
Ah, that would explain it. I guess I''ll hold off on integrating
IronRuby
just yet.

--

Thank you both for your time.

-- 
Posted via http://www.ruby-forum.com/.

to add directories to your search path from within C# you can do 
something like this:


var engine  = Ruby.CreateEngine();
var searchPaths = engine.GetSearchPaths().ToList();
searchPaths.Add(@"c:\code\generator\lib");
searchPaths.Add(@"C:\Ruby-ri-192\lib\ruby\1.9.1");
engine.SetSearchPaths(searchPaths);

Let me know if you find out how to access classes that are within 
modules from C#.  I''m having no luck.

-- 
Posted via http://www.ruby-forum.com/.

I got it working using a kind of a hack/workaround.

I know this is kind of a hack/workaround, but I managed to do it this way:

I added the next code to the end of the ruby file:

    def hack(s)
      eval(s)
    end

And then used it from the C# code to get the class object:

    var engine = Ruby.CreateEngine();

    var scope
engine.ExecuteFile(@"c:\code\generator\lib\generator\generator_cmd_line.rb");

    var genCmdLineObj =
engine.Execute(String.Format("hack(''{0}::{1}'')",
"Generator", "CmdLine"), scope);

    var cmdLineObj = engine.Operations.CreateInstance(genCmdLineObj);
    var results = engine.Operations.InvokeMember(cmdLineObj, "run");
    return Content(results);

Kind of a hack, but hey, it works! :)

Shay.
--------------------------------------------------------
Shay Friedman |  Co-Founder @ CodeValue <http://codevalue.net/> |
C#/IronRuby MVP | Author of IronRuby Unleashed
Blog: http://IronShay.com <http://ironshay.com/> | Twitter:
http://twitter.com/ironshay




On Thu, Feb 24, 2011 at 4:41 PM, Rob R. <lists at ruby-forum.com> wrote:
> to add directories to your search path from within C# you can do
> something like this:
>
>
> var engine  = Ruby.CreateEngine();
> var searchPaths = engine.GetSearchPaths().ToList();
> searchPaths.Add(@"c:\code\generator\lib");
> searchPaths.Add(@"C:\Ruby-ri-192\lib\ruby\1.9.1");
> engine.SetSearchPaths(searchPaths);
>
> Let me know if you find out how to access classes that are within
> modules from C#.  I''m having no luck.
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core
>
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Wouldn''t this work?

dynamic globalConstants = engine.Runtime.Globals

globalConstants.MyModule.const_get(''MyClass'')

assuming

module MyModule
  class MyClass
  end
end

Haven''t tried. Let me know if it works.

Tomas

From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at
rubyforge.org] On Behalf Of Shay Friedman
Sent: Thursday, February 24, 2011 10:38 PM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Accessing a Module''s Classes from C# with
dynamic

I got it working using a kind of a hack/workaround.

I know this is kind of a hack/workaround, but I managed to do it this way:

I added the next code to the end of the ruby file:

    def hack(s)
      eval(s)
    end

And then used it from the C# code to get the class object:

    var engine = Ruby.CreateEngine();

    var scope =
engine.ExecuteFile(@"c:\code\generator\lib\generator\generator_cmd_line.rb");

    var genCmdLineObj =
engine.Execute(String.Format("hack(''{0}::{1}'')",
"Generator", "CmdLine"), scope);

    var cmdLineObj = engine.Operations.CreateInstance(genCmdLineObj);
    var results = engine.Operations.InvokeMember(cmdLineObj, "run");
    return Content(results);

Kind of a hack, but hey, it works! :)

Shay.
--------------------------------------------------------
Shay Friedman |  Co-Founder @ CodeValue<http://codevalue.net/> |
C#/IronRuby MVP | Author of IronRuby Unleashed
Blog: http://IronShay.com<http://ironshay.com/> | Twitter:
http://twitter.com/ironshay



On Thu, Feb 24, 2011 at 4:41 PM, Rob R. <lists at
ruby-forum.com<mailto:lists at ruby-forum.com>> wrote:
to add directories to your search path from within C# you can do
something like this:


var engine  = Ruby.CreateEngine();
var searchPaths = engine.GetSearchPaths().ToList();
searchPaths.Add(@"c:\code\generator\lib");
searchPaths.Add(@"C:\Ruby-ri-192\lib\ruby\1.9.1");
engine.SetSearchPaths(searchPaths);

Let me know if you find out how to access classes that are within
modules from C#.  I''m having no luck.

--
Posted via http://www.ruby-forum.com/.
_______________________________________________
Ironruby-core mailing list
Ironruby-core at rubyforge.org<mailto:Ironruby-core at rubyforge.org>
http://rubyforge.org/mailman/listinfo/ironruby-core

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const_get doesn''t work, but you can do
globalConstants.MyModule.constants()[0] but then you get back an object
which you can''t initialize...

Shay.



On Fri, Feb 25, 2011 at 10:25 AM, Tomas Matousek <
Tomas.Matousek at microsoft.com> wrote:
>  Wouldn?t this work?
>
>
>
> dynamic globalConstants = engine.Runtime.Globals
>
>
>
> globalConstants.MyModule.const_get(?MyClass?)
>
>
>
> assuming
>
>
>
> module MyModule
>
>   class MyClass
>
>   end
>
> end
>
>
>
> Haven?t tried. Let me know if it works.
>
>
>
> Tomas
>
>
>
> *From:* ironruby-core-bounces at rubyforge.org [mailto:
> ironruby-core-bounces at rubyforge.org] *On Behalf Of *Shay Friedman
> *Sent:* Thursday, February 24, 2011 10:38 PM
>
> *To:* ironruby-core at rubyforge.org
> *Subject:* Re: [Ironruby-core] Accessing a Module''s Classes from
C# with
> dynamic
>
>
>
> I got it working using a kind of a hack/workaround.
>
>
>
> I know this is kind of a hack/workaround, but I managed to do it this way:
>
>
>
> I added the next code to the end of the ruby file:
>
>
>
>     def hack(s)
>
>       eval(s)
>
>     end
>
>
>
> And then used it from the C# code to get the class object:
>
>
>
>     var engine = Ruby.CreateEngine();
>
>
>
>     var scope >
engine.ExecuteFile(@"c:\code\generator\lib\generator\generator_cmd_line.rb");
>
>
>
>     var genCmdLineObj =
engine.Execute(String.Format("hack(''{0}::{1}'')",
> "Generator", "CmdLine"), scope);
>
>
>
>     var cmdLineObj = engine.Operations.CreateInstance(genCmdLineObj);
>
>     var results = engine.Operations.InvokeMember(cmdLineObj,
"run");
>
>     return Content(results);
>
>
>
> Kind of a hack, but hey, it works! :)
>
>
>
> Shay.
>
> --------------------------------------------------------
>
> Shay Friedman |  Co-Founder @ CodeValue <http://codevalue.net/> |
> C#/IronRuby MVP | Author of IronRuby Unleashed
>
> Blog: http://IronShay.com <http://ironshay.com/> | Twitter:
> http://twitter.com/ironshay
>
>
>
>
>
>  On Thu, Feb 24, 2011 at 4:41 PM, Rob R. <lists at ruby-forum.com>
wrote:
>
> to add directories to your search path from within C# you can do
> something like this:
>
>
> var engine  = Ruby.CreateEngine();
> var searchPaths = engine.GetSearchPaths().ToList();
> searchPaths.Add(@"c:\code\generator\lib");
> searchPaths.Add(@"C:\Ruby-ri-192\lib\ruby\1.9.1");
> engine.SetSearchPaths(searchPaths);
>
> Let me know if you find out how to access classes that are within
> modules from C#.  I''m having no luck.
>
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core
>
>
>
> _______________________________________________
> Ironruby-core mailing list
> Ironruby-core at rubyforge.org
> http://rubyforge.org/mailman/listinfo/ironruby-core
>
>
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