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Add 'supports-source-properties?' predicate

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* libguile/srcprop.c (scm_supports_source_properties_p): New procedure.
  (supports_source_props): New static C function.

* libguile/srcprop.h (scm_supports_source_properties_p): Add prototype.

* doc/ref/api-debug.texi (Source Properties): Add documentation.
This commit is contained in:
Mark H Weaver 2012-02-14 02:14:10 -05:00
parent fb3a112122
commit 76b9bac565
3 changed files with 27 additions and 1 deletions
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6
doc/ref/api-debug.texi
View file

@ -258,6 +258,12 @@ ERROR: Unbound variable: xxx
In the latter case, no source properties were stored, so the error
doesn't have any source information.
@deffn {Scheme Procedure} supports-source-properties? obj
@deffnx {C Function} scm_supports_source_properties_p (obj)
Return #t if source properties can be associated with @var{obj},
otherwise return #f.
@end deffn
The recording of source properties is controlled by the read option
named ``positions'' (@pxref{Scheme Read}). This option is switched
@emph{on} by default.

18
libguile/srcprop.c
View file

@ -94,6 +94,14 @@ static SCM scm_srcprops_to_alist (SCM obj);
scm_t_bits scm_tc16_srcprops;
static int
supports_source_props (SCM obj)
{
return SCM_NIMP (obj) && !scm_is_symbol (obj) && !scm_is_keyword (obj);
}
static int
srcprops_print (SCM obj, SCM port, scm_print_state *pstate)
{
@ -160,6 +168,16 @@ scm_srcprops_to_alist (SCM obj)
return alist;
}
SCM_DEFINE (scm_supports_source_properties_p, "supports-source-properties?", 1, 0, 0,
(SCM obj),
"Return #t if @var{obj} supports adding source properties,\n"
"otherwise return #f.")
#define FUNC_NAME s_scm_supports_source_properties_p
{
return scm_from_bool (supports_source_props (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_source_properties, "source-properties", 1, 0, 0,
(SCM obj),
"Return the source property association list of @var{obj}.")

4
libguile/srcprop.h
View file

@ -3,7 +3,8 @@
#ifndef SCM_SRCPROP_H
#define SCM_SRCPROP_H
/* Copyright (C) 1995,1996,2000,2001, 2006, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
/* Copyright (C) 1995, 1996, 2000, 2001, 2006, 2008, 2009, 2010,
* 2011, 2012 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@ -41,6 +42,7 @@ SCM_API SCM scm_sym_column;
SCM_API SCM scm_supports_source_properties_p (SCM obj);
SCM_API SCM scm_make_srcprops (long line, int col, SCM fname, SCM copy, SCM plist);
SCM_API SCM scm_source_property (SCM obj, SCM key);
SCM_API SCM scm_set_source_property_x (SCM obj, SCM key, SCM datum);