specifying module with eval

specifying module with eval

[Rouben Rostamian]

The Guile 1.6.4 documentation says:

 - Scheme Procedure: eval exp module
 - C Function: scm_eval (exp, module)
     Evaluate EXP, a list representing a Scheme expression, in the
     top-level environment specified by MODULE.  While EXP is evaluated
     (using `primitive-eval'), MODULE is made the current module.  The
     current module is reset to its previous value when EVAL returns.

It is not clear to me how to specify a module name.
What is the syntax for it?

In other words, what do I put for "module-spec" in the expression

   (eval '(foo 12) module-spec)

to refer to the desired module?


-- 
Rouben Rostamian


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Re: specifying module with eval

[Issac Trotts]

On Mon, Jan 26, 2004 at 07:28:46PM -0500, Rouben Rostamian wrote:
> The Guile 1.6.4 documentation says:
> 
>  - Scheme Procedure: eval exp module
>  - C Function: scm_eval (exp, module)
>      Evaluate EXP, a list representing a Scheme expression, in the
>      top-level environment specified by MODULE.  While EXP is evaluated
>      (using `primitive-eval'), MODULE is made the current module.  The
>      current module is reset to its previous value when EVAL returns.
> 
> It is not clear to me how to specify a module name.
> What is the syntax for it?
> 
> In other words, what do I put for "module-spec" in the expression
> 
>    (eval '(foo 12) module-spec)
> 
> to refer to the desired module?

I was going to say "Have a look at p. 35 of the Scheme specification,"
but their advice doesn't work with the version of guile on my system
(1.6.4):

  guile> (eval '(* 7 3) (scheme-report-environment 5))
  
  Backtrace:
  In current input:
    1: 0* [eval (* 7 3) ...
    1: 1*  (scheme-report-environment 5)
  
  <unnamed port>:1:16: In expression (scheme-report-environment 5):
  <unnamed port>:1:16: Unbound variable: scheme-report-environment
  ABORT: (unbound-variable)
  guile> (eval '(* 7 3) (null-environment 5))
  
  Backtrace:
  In current input:
    2: 0* [eval (* 7 3) ...
    2: 1*  (null-environment 5)
  
  <unnamed port>:2:16: In expression (null-environment 5):
  <unnamed port>:2:16: Unbound variable: null-environment
  ABORT: (unbound-variable)

I wonder why guile doesn't conform to the spec here.

-- 
Issac Trotts
http://redwood.ucdavis.edu/~issac



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Re: specifying module with eval

[Rob Browning]

"Issac Trotts" <ijtrotts@ucdavis.edu> writes:

> I wonder why guile doesn't conform to the spec here.

Looks like at least at the moment, you need a (use-modules (ice-9
r5rs)) first.  I'll have to figure out whether the docs or the default
imports of the guile-user module need changing.

-- 
Rob Browning
rlb @defaultvalue.org and @debian.org; previously @cs.utexas.edu
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Re: specifying module with eval

[Marius Vollmer]

Rob Browning <rlb@defaultvalue.org> writes:

> "Issac Trotts" <ijtrotts@ucdavis.edu> writes:
>
>> I wonder why guile doesn't conform to the spec here.
>
> Looks like at least at the moment, you need a (use-modules (ice-9
> r5rs)) first.  I'll have to figure out whether the docs or the default
> imports of the guile-user module need changing.

[Rob, I changed my mind.]

I think we should make (guile-user) use (ice-9 r5rs) by default.  I
have done so in CVS.

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