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/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include <stdio.h>
#include "_scm.h"
#include "alist.h"
#include "eval.h"
#include "procs.h"
#include "gsubr.h"
#include "procprop.h"
SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
static SCM
scm_i_procedure_arity (proc)
{
int a = 0, o = 0, r = 0;
loop:
switch (SCM_TYP7 (proc))
{
case scm_tc7_subr_1o:
o = 1;
case scm_tc7_subr_0:
break;
case scm_tc7_subr_2o:
o = 1;
case scm_tc7_subr_1:
case scm_tc7_cxr:
case scm_tc7_contin:
a += 1;
break;
case scm_tc7_subr_2:
a += 2;
break;
case scm_tc7_subr_3:
a += 3;
break;
case scm_tc7_asubr:
case scm_tc7_rpsubr:
case scm_tc7_lsubr:
r = 1;
case scm_tc7_lsubr_2:
a += 2;
break;
#ifdef CCLO
case scm_tc7_cclo:
if (SCM_CCLO_SUBR (proc) == scm_f_gsubr_apply)
{
int type = SCM_INUM (SCM_GSUBR_TYPE (proc));
a = SCM_GSUBR_REQ (type);
o = SCM_GSUBR_OPT (type);
r = SCM_GSUBR_REST (type);
break;
}
proc = SCM_CCLO_SUBR (proc);
a -= 1;
goto loop;
#endif
case scm_tcs_closures:
proc = SCM_CAR (SCM_CODE (proc));
if (SCM_IMP (proc))
break;
while (SCM_NIMP (proc) && SCM_CONSP (proc))
{
++a;
proc = SCM_CDR (proc);
}
if (SCM_NIMP (proc))
r = 1;
break;
}
return SCM_LIST3 (SCM_MAKINUM (a),
SCM_MAKINUM (o),
r ? SCM_BOOL_T : SCM_BOOL_F);
}
static SCM
scm_stand_in_scm_proc(proc)
SCM proc;
{
SCM answer;
answer = scm_assoc (proc, scm_stand_in_procs);
if (answer == SCM_BOOL_F)
{
answer = scm_closure (scm_listify (SCM_EOL, SCM_BOOL_F, SCM_UNDEFINED),
SCM_EOL);
scm_stand_in_procs = scm_cons (scm_cons (proc, answer),
scm_stand_in_procs);
}
else
answer = SCM_CDR (answer);
return answer;
}
SCM_PROC(s_procedure_properties, "procedure-properties", 1, 0, 0, scm_procedure_properties);
SCM
scm_procedure_properties (proc)
SCM proc;
{
SCM_ASSERT (SCM_NFALSEP (scm_procedure_p (proc)),
proc, SCM_ARG1, s_procedure_properties);
return scm_acons (scm_sym_arity, scm_i_procedure_arity (proc),
SCM_PROCPROPS (SCM_NIMP (proc) && SCM_CLOSUREP (proc)
? proc
: scm_stand_in_scm_proc (proc)));
}
SCM_PROC(s_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0, scm_set_procedure_properties_x);
SCM
scm_set_procedure_properties_x (proc, new_val)
SCM proc;
SCM new_val;
{
if (!(SCM_NIMP (proc) && SCM_CLOSUREP (proc)))
proc = scm_stand_in_scm_proc(proc);
SCM_ASSERT (SCM_NIMP (proc) && SCM_CLOSUREP (proc), proc, SCM_ARG1, s_set_procedure_properties_x);
SCM_SETPROCPROPS (proc, new_val);
return SCM_UNSPECIFIED;
}
SCM_PROC(s_procedure_property, "procedure-property", 2, 0, 0, scm_procedure_property);
SCM
scm_procedure_property (p, k)
SCM p;
SCM k;
{
SCM assoc;
SCM_ASSERT (SCM_NFALSEP (scm_procedure_p (p)),
p, SCM_ARG1, s_procedure_property);
if (k == scm_sym_arity)
return scm_i_procedure_arity (p);
assoc = scm_sloppy_assq (k,
SCM_PROCPROPS (SCM_NIMP (p) && SCM_CLOSUREP (p)
? p
: scm_stand_in_scm_proc (p)));
return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
}
SCM_PROC(s_set_procedure_property_x, "set-procedure-property!", 3, 0, 0, scm_set_procedure_property_x);
SCM
scm_set_procedure_property_x (p, k, v)
SCM p;
SCM k;
SCM v;
{
SCM assoc;
if (!(SCM_NIMP (p) && SCM_CLOSUREP (p)))
p = scm_stand_in_scm_proc(p);
SCM_ASSERT (SCM_NIMP (p) && SCM_CLOSUREP (p), p, SCM_ARG1, s_set_procedure_property_x);
if (k == scm_sym_arity)
scm_misc_error (s_set_procedure_property_x,
"arity is a read-only property",
SCM_EOL);
assoc = scm_sloppy_assq (k, SCM_PROCPROPS (p));
if (SCM_NIMP (assoc))
SCM_SETCDR (assoc, v);
else
SCM_SETPROCPROPS (p, scm_acons (k, v, SCM_PROCPROPS (p)));
return SCM_UNSPECIFIED;
}
void
scm_init_procprop ()
{
#include "procprop.x"
}
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