Re: [PATCH] for strports.c: scm_c_eval_string_from_file_line

From: Marius Vollmer <mvo@zagadka.de>
Cc: guile development <guile-devel@gnu.org>
Subject: Re: [PATCH] for strports.c: scm_c_eval_string_from_file_line
Date: 01 Jun 2003 22:00:31 +0200	[thread overview]
Message-ID: <87el2dlg9s.fsf@zagadka.ping.de> (raw)
In-Reply-To: <3ECFDA48.309D0F5@veritas.com>

Bruce Korb <bkorb@veritas.com> writes:

> 2003-05-24  Bruce Korb  <bkorb@gnu.org>
> 
> 	* guile-core/libguile/strports.c(scm_c_eval_string_from_file_line):
> 	new procedure.  Facilitate error messages for applications that
> 	extract scheme code from their input files.

Hmm, I'm not sure whether we should provide such a function as a ready
made unit.  Evaluation from strings (maybe with embedded new lines,
maybe more than one string, etc) while maintaining the line number,
the current module, etc, might come in several variations, I think.

We should provide the building blocks so that people can easily
implement what they want cleanly so that
scm_c_eval_string_from_file_line is very easy to implement.

What you can do right now is, for example (and untested, sorry):

  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?  But we might want to offer it
ready-made, anyway.  Opinions?

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