Embedding guile in a C application.

Embedding guile in a C application.

[Binesh Bannerjee]

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Hi...
 	I'm looking to code a genetic programming system a-la Koza ( 
http://www.geneticprogramming.com/Tutorial/ )...
 	I'd like to embed a Guile interpreter inside the app,
and have the C program generate Guile functions, and then get interpreted
with Guile... I'm not sure how to go about doing this, and I haven't found
any clear directions how to do so... (Although, I _have_ found hints that it
should be possible.) http://www.swig.org/Doc1.3/Guile.html shows me
how to embed guile... But, I don't think that's exactly what I want.
What it does, is create a whole guile interpreter shell and all...

All's I want is (something like) this:
 	int main(int argc,char *argv[]) {
 		guile_interpreter gi = create_guile_interpreter();
/* c = (define f (lambda (x) (+ 1 x))); */
 		cons c = new list_struct();
 		c->add("define");
 		c->add("f");
 		cons c2 = new list_struct();
 		c2->add("lambda");
 		const c3 = new list_struct();
 		c3->add("x");
 		c2->add_list(c3);
 		const c4 = new list_struct();
 		c4->add("+");
 		c4->add("x");
 		c4->add("1");
 		c2->add_list(c4);
 		c->add_list(c2);

 		gi->interpret(c);
 		cons r = new list_struct();
 		r->add("f");
 		r->add("6");
 		cons retVal = gi->interpret(r);
 		printf("%d\n",retVal->value());
 	}

 	and have that print out 7.

How would I do that?

Thanks!
Binesh

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Re: Embedding guile in a C application.

[Linas Vepstas]

On Sun, May 30, 2004 at 02:32:56AM -0400, Binesh Bannerjee was heard to remark:
> 	I'd like to embed a Guile interpreter inside the app,

Try reading some of teh guile tutorials.

In your C code, you'd want to call scm_c_eval_string () to evaluate a
string e.g. scm_c_eval_string ("(define f (lambda (x) (+ 1 x)))");

Guile also like  to hold the main loop (I don't know why, is this fixed
yet?)

void
guile_inner_main(void *closure, int argc, char **argv)
{ 
  ... your prog ... 
}

int
main (int argc, char **argv)
{
  scm_boot_guile (argc, argv, guile_inner_main, NULL);
}


To do your example, below, you would have to write your own
C++ class that assembled stuff into strings, and then called
scm_c_eval_string() on the resulting string.  Caution: you will
find debugging something like the below for syntax errors to be very
very hard.

> /* c = (define f (lambda (x) (+ 1 x))); */
> 		cons c = new list_struct();
> 		c->add("define");
> 		c->add("f");
> 		cons c2 = new list_struct();
> 		c2->add("lambda");
> 		const c3 = new list_struct();
> 		c3->add("x");
> 		c2->add_list(c3);
> 		const c4 = new list_struct();
> 		c4->add("+");
> 		c4->add("x");
> 		c4->add("1");
> 		c2->add_list(c4);
> 		c->add_list(c2);

--linas

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Re: Embedding guile in a C application.

[Binesh Bannerjee]

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On Sun, 30 May 2004, Linas Vepstas wrote:

> On Sun, May 30, 2004 at 02:32:56AM -0400, Binesh Bannerjee was heard to remark:
>> 	I'd like to embed a Guile interpreter inside the app,
>
> Try reading some of teh guile tutorials.
>
> In your C code, you'd want to call scm_c_eval_string () to evaluate a
> string e.g. scm_c_eval_string ("(define f (lambda (x) (+ 1 x)))");

Nice, thanks!

I actually couldn't find any of the tutorials, but, searching for 
scm_c_eval_string on google gave me enough direction to move...

I'll attach my code, just in case someone else has the same
question.

Thanks again!
Binesh Bannerjee

 	#include <stdio.h>
 	#include <libguile.h>

 	void inner_main(void *closure,int argc,char **argv) {
 		scm_c_eval_string("(define f (lambda (x) (+ 1 x)))");
 		SCM s = scm_c_eval_string("(f 5)");
 		int q = SCM_INUM(s);
 		fprintf(stderr,"%d\n",q);
 	}

 	int main(int argc,char *argv[]) {
 		scm_boot_guile(argc,argv,inner_main,0);
 		return(0);
 	}

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Re: Embedding guile in a C application.

[Binesh Bannerjee]

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On Mon, 31 May 2004, Binesh Bannerjee wrote:

>
> I actually couldn't find any of the tutorials, but, searching for
> scm_c_eval_string on google gave me enough direction to move...

Rather, I should say, I couldn't find a clear tutorial that described
how to read scheme variables and call scheme procedures from C and vice versa...

Binesh

>

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Re: Embedding guile in a C application.

[Mike Gran]

I have been trying to assemble my notes on that subject into something
useful.  I've only just started, but, you can see what I've done at
http://lonelycactus.com/guilebook/ .  

It is probably premature to advertise this now, since this is really
rough stuff, with a lot of needless text in the beginning and only a
little bit of useful content so far.  But hopefully I can try to fix it
up as time allows.

-Mike

--- Binesh Bannerjee <binesh-guile@hex21.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On Mon, 31 May 2004, Binesh Bannerjee wrote:
> 
> >
> > I actually couldn't find any of the tutorials, but, searching for
> > scm_c_eval_string on google gave me enough direction to move...
> 
> Rather, I should say, I couldn't find a clear tutorial that described
> how to read scheme variables and call scheme procedures from C and
> vice versa...
> 
> Binesh



	
		
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Re: Embedding guile in a C application.

[rm]

On Mon, May 31, 2004 at 12:54:20PM -0700, Mike Gran wrote:
> I have been trying to assemble my notes on that subject into something
> useful.  I've only just started, but, you can see what I've done at
> http://lonelycactus.com/guilebook/ .  

Minor nitpick: if you close that last </html tag some browsers will be
much more happy ;-)
Other than that: very nice work! There should be a link to your page
on the guile website.

 
  Ralf Mattes

  
> It is probably premature to advertise this now, since this is really
> rough stuff, with a lot of needless text in the beginning and only a
> little bit of useful content so far.  But hopefully I can try to fix it
> up as time allows.
> 
> -Mike
> 
> --- Binesh Bannerjee <binesh-guile@hex21.com> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > On Mon, 31 May 2004, Binesh Bannerjee wrote:
> > 
> > >
> > > I actually couldn't find any of the tutorials, but, searching for
> > > scm_c_eval_string on google gave me enough direction to move...
> > 
> > Rather, I should say, I couldn't find a clear tutorial that described
> > how to read scheme variables and call scheme procedures from C and
> > vice versa...
> > 
> > Binesh
> 
> 
> 
> 	
> 		
> __________________________________
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Re: Embedding guile in a C application.

[Marius Vollmer]

rm@fabula.de writes:

> On Mon, May 31, 2004 at 12:54:20PM -0700, Mike Gran wrote:
>
>> I have been trying to assemble my notes on that subject into something
>> useful.  I've only just started, but, you can see what I've done at
>> http://lonelycactus.com/guilebook/ .  
>
> [...] There should be a link to your page on the guile website.

Definitely!  Done!

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