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Re: [PATCH] for strports.c: scm_c_eval_string_from_file_line
From: |
Marius Vollmer |
Subject: |
Re: [PATCH] for strports.c: scm_c_eval_string_from_file_line |
Date: |
09 Jun 2003 21:53:56 +0200 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 |
Bruce Korb <address@hidden> writes:
> Marius Vollmer wrote:
>
> > void
> > scm_c_primitive_load_from_string (const char *str,
> > const char *filename, int line)
> > {
> > SCM port, exp;
> >
> > port = scm_open_input_string (scm_str2string (str));
> > scm_set_port_file_name_x (port, scm_str2string (filename));
> > scm_set_port_line_x (port, scm_int2num (line));
> >
> > while (!SCM_EOF_OBJECT_P (exp = scm_read (port)))
> > scm_primitive_eval_x (exp);
> > }
> >
> > I think this quite straightforward, no?
>
> No.
Err, I mean, once you see how it is done. The manual can be improved,
I'm sure.
> [...] I also try to avoid gratuitous creations of
> string SCM's since the file name is generally invariant.
> You omitted returning the final value, which is important :-).
As you see, there are quite some variants on this theme, and I think
the above code is clean enough to allow for easy modification. There
is no black magic in it.
> It's easier to ignore if the caller doesn't want it. And, no,
> I didn't find that the research required to do this was obvious.
> In fact, there is no ``scm_set_port_file_name_x'' in 1.6.3, so
> you must be talking 1.7 here.
Oops, it is "scm_set_port_filename_x".
> I'm still working with 1.4. Therefore, I must directly assign to
> ``file_name''. I may as well assign the line number, too.
One more reason to join the happy Guile 1.6 club...
> I'd rather it was ready made so I can just #define my
> ``ag_scm_c_eval_string_from_file_line'' into
> ``scm_c_primitive_load_from_string''. You might tweak it a bit so a
> NULL file pointer bypasses the scm_set_port_file_name_x call. I'd
> also use "file_line" in the name, but that is your call.
Given these minor variations, I suggest you just use the function from
above. That way, you get exactly what you want.
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