Passing a .NET object to the RubyEngine

Hi All, I posted some code for calling IronRuby code I found in the
mailing
list onto the wiki.

http://ironruby.rubyforge.org/wiki/wiki.pl?ExecutingIronRubyFromCSharp

RubyEngine re = RubyEngine.CurrentEngine;

string script = “s = ‘let us get started’” + Environment.NewLine

+ "i = s.length");

re.ExecuteCommand(script);

The only thing is, I don’t know how to pass a .NET object to the context
of
the RubyEngine so it can be called from within the script. I’d like to
update the example with that.

Any help?

Phil

Here’s a quick example:

RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule mod =
ScriptDomainManager.CurrentManager.Host.DefaultModule

string script = “puts ‘Ruby and ’ + var.to_s + ’ together at last’”

mod.SetVariable(“var”, “.NET”)

re.ExecuteCommand(script, mod);
A couple things to note:

  1. var.to_s is necessary because I don’t think IR is coercing CLR
    Strings to
    Ruby Strings yet.
  2. I’m not sure why you need to pass in the default module to
    ExecuteCommand, but I wasn’t able to evaluate the variable in Ruby
    otherwise.

-Eric

Whoops … missing some semicolons there. Can you tell I spend most of
my
day in VB.NET?

Eric N. wrote:

A couple things to note:

  1. var.to_s is necessary because I don’t think IR is coercing CLR
    Strings to Ruby Strings yet.
  2. I’m not sure why you need to pass in the default module to
    ExecuteCommand, but I wasn’t able to evaluate the variable in Ruby
    otherwise.

How can this work? In order for var to be available in the script, it
would have to be added into the toplevel scope. This would either mean
that var is now available in all toplevel scopes across the system
(incompatible with Ruby) or that it would only be available in the
current thread’s scope above toplevel (which would prevent seeing it in
other threads. I’m a little confused. In JRuby we opted to not allow
external variable binding into the eventual execution scope, because it
seemed to violate that the scope should be created fresh for each script
execution.

  • Charlie

Someone at MS can probably answer this better than I, but I’m guessing
that
passing in the module explicitly to the ExecuteCommand statement is what
makes this work. If you leave off that optional parameter the variable
isn’t directly accessible.

You can always create a new module fairly easily and pass that in as
well if
you’d rather.

Eric N. wrote:

Someone at MS can probably answer this better than I, but I’m guessing
that passing in the module explicitly to the ExecuteCommand statement is
what makes this work. If you leave off that optional parameter the
variable isn’t directly accessible.

You can always create a new module fairly easily and pass that in as
well if you’d rather.

Local variables aren’t stored in modules though; unless this is adding
an attribute, which would seem really wrong.

  • Charlie

I believe there are two types of “Modules” at play here. I think a DLR
“Module” is something more like a scope than the Ruby “Module”.

Nice! I’ll update the wiki. This worked for me.

From: [email protected]
[mailto:[email protected]] On Behalf Of Eric N.
Sent: Friday, September 28, 2007 6:38 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Here’s a quick example:

RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule mod =
ScriptDomainManager.CurrentManager.Host.DefaultModule

string script = “puts ‘Ruby and ’ + var.to_s + ’ together at last’”

mod.SetVariable(“var”, “.NET”)

re.ExecuteCommand(script, mod);

A couple things to note:

  1. var.to_s is necessary because I don’t think IR is coercing CLR
    Strings to
    Ruby Strings yet.
  2. I’m not sure why you need to pass in the default module to
    ExecuteCommand, but I wasn’t able to evaluate the variable in Ruby
    otherwise.

-Eric

On 9/28/07, Phil H. [email protected] wrote:

Hi All, I posted some code for calling IronRuby code I found in the
mailing
list onto the wiki.

http://ironruby.rubyforge.org/wiki/wiki.pl?ExecutingIronRubyFromCSharp

RubyEngine re = RubyEngine.CurrentEngine;

string script = “s = ‘let us get started’” + Environment.NewLine

+ "i = s.length");

re.ExecuteCommand(script);

The only thing is, I don’t know how to pass a .NET object to the context
of
the RubyEngine so it can be called from within the script. I’d like to
update the example with that.

Any help?

Phil

Well, technically between Ruby and VB.Net, but yeah, absolutely, works
quite
well too.

The string above is actually a “real” object the way Ruby sees it, so
it’s
basically the same. I’ll put a quick example together if no one beats
me to
it.

-Eric

On 9/28/07, Stefan Hüttenrauch [email protected]

That’s what I was thinking too. Here’s what I put together:

class Program
{
static void Main(string[] args)
{
RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule scriptModule =
ScriptDomainManager.CurrentManager.Host.DefaultModule;
string script = “require ‘CSIronRuby’; puts ‘Hello, ’ +
var.GetName.to_s + ’ World!’”;
MyName name = new MyName();
scriptModule.SetVariable(“var”, name);
re.ExecuteCommand(script, scriptModule);
Console.ReadLine();
}
}

public class MyName
{
public string Name = “Cory”;

public string GetName()
{
     return Name;
}

}

For some reason, I was having difficulty getting it to output just Name

  • I just didn’t want to tear into it.

Cory

From: [email protected]
[mailto:[email protected]] On Behalf Of Stefan
Hüttenrauch
Sent: Friday, September 28, 2007 10:49 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Nice stuff Eric,

Have you already passed real objects back and forth between Ruby and
C#?? That would be the real cool stuff. I will hack a little tomorrow I
guess, but if you have any tips already, that would be great.

Thanks
Stefan

From: [email protected]
[mailto:[email protected]] On Behalf Of Eric N.
Sent: Freitag, 28. September 2007 15:40
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Whoops … missing some semicolons there. Can you tell I spend most of
my day in VB.NEThttp://VB.NET?
On 9/28/07, Eric N. <
[email protected]mailto:[email protected]> wrote:
Here’s a quick example:

RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule mod =
ScriptDomainManager.CurrentManager.Host.DefaultModule

string script = “puts ‘Ruby and ’ + var.to_s + ’ together at last’”

mod.SetVariable(“var”, “.NET”)

re.ExecuteCommand(script, mod);
A couple things to note:

  1. var.to_s is necessary because I don’t think IR is coercing CLR
    Strings to Ruby Strings yet.
  2. I’m not sure why you need to pass in the default module to
    ExecuteCommand, but I wasn’t able to evaluate the variable in Ruby
    otherwise.

-Eric
On 9/28/07, Phil H. <[email protected]mailto:[email protected]>
wrote:

Hi All, I posted some code for calling IronRuby code I found in the
mailing list onto the wiki.

http://ironruby.rubyforge.org/wiki/wiki.pl?ExecutingIronRubyFromCSharp

RubyEngine re = RubyEngine.CurrentEngine;

string script = “s = ‘let us get started’” + Environment.NewLine

+ "i = s.length");

re.ExecuteCommand(script);

The only thing is, I don’t know how to pass a .NET object to the context
of the RubyEngine so it can be called from within the script. I’d like
to update the example with that.

Any help?

Phil

Sorry, ignore the require line in the script - that was cruft left over
from something else I was doing and isn’t needed.

Cory

From: [email protected]
[mailto:[email protected]] On Behalf Of Cory F.
Sent: Friday, September 28, 2007 11:02 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

That’s what I was thinking too. Here’s what I put together:

class Program
{
static void Main(string[] args)
{
RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule scriptModule =
ScriptDomainManager.CurrentManager.Host.DefaultModule;
string script = “require ‘CSIronRuby’; puts ‘Hello, ’ +
var.GetName.to_s + ’ World!’”;
MyName name = new MyName();
scriptModule.SetVariable(“var”, name);
re.ExecuteCommand(script, scriptModule);
Console.ReadLine();
}
}

public class MyName
{
public string Name = “Cory”;

public string GetName()
{
     return Name;
}

}

For some reason, I was having difficulty getting it to output just Name

  • I just didn’t want to tear into it.

Cory

From: [email protected]
[mailto:[email protected]] On Behalf Of Stefan
Hüttenrauch
Sent: Friday, September 28, 2007 10:49 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Nice stuff Eric,

Have you already passed real objects back and forth between Ruby and
C#?? That would be the real cool stuff. I will hack a little tomorrow I
guess, but if you have any tips already, that would be great.

Thanks
Stefan

From: [email protected]
[mailto:[email protected]] On Behalf Of Eric N.
Sent: Freitag, 28. September 2007 15:40
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Whoops … missing some semicolons there. Can you tell I spend most of
my day in VB.NEThttp://VB.NET?
On 9/28/07, Eric N. <
[email protected]mailto:[email protected]> wrote:
Here’s a quick example:

RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule mod =
ScriptDomainManager.CurrentManager.Host.DefaultModule

string script = “puts ‘Ruby and ’ + var.to_s + ’ together at last’”

mod.SetVariable(“var”, “.NET”)

re.ExecuteCommand(script, mod);
A couple things to note:

  1. var.to_s is necessary because I don’t think IR is coercing CLR
    Strings to Ruby Strings yet.
  2. I’m not sure why you need to pass in the default module to
    ExecuteCommand, but I wasn’t able to evaluate the variable in Ruby
    otherwise.

-Eric
On 9/28/07, Phil H. <[email protected]mailto:[email protected]>
wrote:

Hi All, I posted some code for calling IronRuby code I found in the
mailing list onto the wiki.

http://ironruby.rubyforge.org/wiki/wiki.pl?ExecutingIronRubyFromCSharp

RubyEngine re = RubyEngine.CurrentEngine;

string script = “s = ‘let us get started’” + Environment.NewLine

+ "i = s.length");

re.ExecuteCommand(script);

The only thing is, I don’t know how to pass a .NET object to the context
of the RubyEngine so it can be called from within the script. I’d like
to update the example with that.

Any help?

Phil

This is part of the hosting API we provide for host applications so that
they can pass objects to and from a dynamic language (be it Ruby or
Python), execute some code within some scope etc.

This API gradually undergoes major changes and it isn’t fully compatible
with Ruby’s semantics today. We already have some design on “paper”
(needs to be polished/reviewed still) that makes it right. It’s
implementation will take some time though. The code bellow should kind
of work (there is a little tweak to the variable binding in the Ruby
compiler to allow it) until we provide some better way. Good news is
that we found a way how to do the integration right for Ruby, so all
features listed above (passing objects there and back, executing code,
etc) will be available in future.

Tomas

From: [email protected]
[mailto:[email protected]] On Behalf Of Cory F.
Sent: Friday, September 28, 2007 8:02 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

That’s what I was thinking too. Here’s what I put together:

class Program
{
static void Main(string[] args)
{
RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule scriptModule =
ScriptDomainManager.CurrentManager.Host.DefaultModule;
string script = “require ‘CSIronRuby’; puts ‘Hello, ’ +
var.GetName.to_s + ’ World!’”;
MyName name = new MyName();
scriptModule.SetVariable(“var”, name);
re.ExecuteCommand(script, scriptModule);
Console.ReadLine();
}
}

public class MyName
{
public string Name = “Cory”;

public string GetName()
{
     return Name;
}

}

For some reason, I was having difficulty getting it to output just Name

  • I just didn’t want to tear into it.

Cory

From: [email protected]
[mailto:[email protected]] On Behalf Of Stefan
Hüttenrauch
Sent: Friday, September 28, 2007 10:49 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Nice stuff Eric,

Have you already passed real objects back and forth between Ruby and
C#?? That would be the real cool stuff. I will hack a little tomorrow I
guess, but if you have any tips already, that would be great.

Thanks
Stefan

From: [email protected]
[mailto:[email protected]] On Behalf Of Eric N.
Sent: Freitag, 28. September 2007 15:40
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Whoops … missing some semicolons there. Can you tell I spend most of
my day in VB.NEThttp://VB.NET?
On 9/28/07, Eric N. <
[email protected]mailto:[email protected]> wrote:
Here’s a quick example:

RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule mod =
ScriptDomainManager.CurrentManager.Host.DefaultModule

string script = “puts ‘Ruby and ’ + var.to_s + ’ together at last’”

mod.SetVariable(“var”, “.NET”)

re.ExecuteCommand(script, mod);
A couple things to note:

  1. var.to_s is necessary because I don’t think IR is coercing CLR
    Strings to Ruby Strings yet.
  2. I’m not sure why you need to pass in the default module to
    ExecuteCommand, but I wasn’t able to evaluate the variable in Ruby
    otherwise.

-Eric
On 9/28/07, Phil H. <[email protected]mailto:[email protected]>
wrote:

Hi All, I posted some code for calling IronRuby code I found in the
mailing list onto the wiki.

http://ironruby.rubyforge.org/wiki/wiki.pl?ExecutingIronRubyFromCSharp

RubyEngine re = RubyEngine.CurrentEngine;

string script = “s = ‘let us get started’” + Environment.NewLine

+ "i = s.length");

re.ExecuteCommand(script);

The only thing is, I don’t know how to pass a .NET object to the context
of the RubyEngine so it can be called from within the script. I’d like
to update the example with that.

Any help?

Phil

BTW, Charles,

congrats on the release of JRuby.

Josh Nursing

Charles Oliver N. wrote:

I updated the demo code in the wiki based on the code snippet here.

http://ironruby.rubyforge.org/wiki/wiki.pl?ExecutingIronRubyFromCSharp

IÂ’ll try and make sure it stays up to date. J

Phil

From: [email protected]
[mailto:[email protected]] On Behalf Of Tomas M.
Sent: Friday, September 28, 2007 12:46 PM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

This is part of the hosting API we provide for host applications so that
they can pass objects to and from a dynamic language (be it Ruby or
Python),
execute some code within some scope etc.

This API gradually undergoes major changes and it isnÂ’t fully compatible
with Ruby’s semantics today. We already have some design on “paper”
(needs
to be polished/reviewed still) that makes it right. ItÂ’s implementation
will
take some time though. The code bellow should kind of work (there is a
little tweak to the variable binding in the Ruby compiler to allow it)
until
we provide some better way. Good news is that we found a way how to do
the
integration right for Ruby, so all features listed above (passing
objects
there and back, executing code, etc) will be available in future.

Tomas

From: [email protected]
[mailto:[email protected]] On Behalf Of Cory F.
Sent: Friday, September 28, 2007 8:02 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

ThatÂ’s what I was thinking too. HereÂ’s what I put together:

class Program

{

static void Main(string[] args)

{

     RubyEngine re = RubyEngine.CurrentEngine;

     IScriptModule scriptModule =

ScriptDomainManager.CurrentManager.Host.DefaultModule;

     string script = "require 'CSIronRuby'; puts 'Hello, ' +

var.GetName.to_s + ’ World!’";

     MyName name = new MyName();

     scriptModule.SetVariable("var", name);

     re.ExecuteCommand(script, scriptModule);

     Console.ReadLine();

}

}

public class MyName

{

public string Name = "Cory";



public string GetName()

{

     return Name;

}

}

For some reason, I was having difficulty getting it to output just Name
– I
just didnÂ’t want to tear into it.

Cory

From: [email protected]
[mailto:[email protected]] On Behalf Of Stefan
Hüttenrauch
Sent: Friday, September 28, 2007 10:49 AM
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Nice stuff Eric,

Have you already passed real objects back and forth between Ruby and
C#??
That would be the real cool stuff. I will hack a little tomorrow I
guess,
but if you have any tips already, that would be great.

Thanks

Stefan

From: [email protected]
[mailto:[email protected]] On Behalf Of Eric N.
Sent: Freitag, 28. September 2007 15:40
To: [email protected]
Subject: Re: [Ironruby-core] Passing a .NET object to the RubyEngine…

Whoops … missing some semicolons there. Can you tell I spend most of
my
day in VB.NET?

On 9/28/07, Eric N. < [email protected]
mailto:[email protected] > wrote:

Here’s a quick example:

RubyEngine re = RubyEngine.CurrentEngine;
IScriptModule mod =
ScriptDomainManager.CurrentManager.Host.DefaultModule

string script = “puts ‘Ruby and ’ + var.to_s + ’ together at last’”

mod.SetVariable(“var”, “.NET”)

re.ExecuteCommand(script, mod);

A couple things to note:

  1. var.to_s is necessary because I don’t think IR is coercing CLR
    Strings to
    Ruby Strings yet.
  2. I’m not sure why you need to pass in the default module to
    ExecuteCommand, but I wasn’t able to evaluate the variable in Ruby
    otherwise.

-Eric

On 9/28/07, Phil H. [email protected] wrote:

Hi All, I posted some code for calling IronRuby code I found in the
mailing
list onto the wiki.

http://ironruby.rubyforge.org/wiki/wiki.pl?ExecutingIronRubyFromCSharp

RubyEngine re = RubyEngine.CurrentEngine;

string script = “s = ‘let us get started’” + Environment.NewLine

+ "i = s.length");

re.ExecuteCommand(script);

The only thing is, I don’t know how to pass a .NET object to the context
of
the RubyEngine so it can be called from within the script. I’d like to
update the example with that.

Any help?

Phil

Josh Nursing wrote:

BTW, Charles,

congrats on the release of JRuby.

Well, it isn’t a new release yet; the current release is still the 1.0.1
maintenance release we cut this summer. I just blogged about the
compiler being complete, and it will be shipped with the 1.1 release
(candidate) in November.

Thanks for the congrats though :slight_smile:

  • Charlie

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