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/* Copyright (C) 1995,1996,1998,2000,2001, 2003 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 as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "libguile/_scm.h"
#include "libguile/alist.h"
#include "libguile/eval.h"
#include "libguile/procs.h"
#include "libguile/gsubr.h"
#include "libguile/objects.h"
#include "libguile/smob.h"
#include "libguile/root.h"
#include "libguile/vectors.h"
#include "libguile/validate.h"
#include "libguile/procprop.h"
SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
SCM
scm_i_procedure_arity (SCM proc)
{
int a = 0, o = 0, r = 0;
if (SCM_IMP (proc))
return SCM_BOOL_F;
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_dsubr:
case scm_tc7_cxr:
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;
break;
case scm_tc7_lsubr_2:
a += 2;
r = 1;
break;
case scm_tc7_smob:
if (SCM_SMOB_APPLICABLE_P (proc))
{
int type = SCM_SMOB_DESCRIPTOR (proc).gsubr_type;
a += SCM_GSUBR_REQ (type);
o = SCM_GSUBR_OPT (type);
r = SCM_GSUBR_REST (type);
break;
}
else
{
return SCM_BOOL_F;
}
case scm_tc7_cclo:
if (SCM_EQ_P (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;
}
else
{
proc = SCM_CCLO_SUBR (proc);
a -= 1;
goto loop;
}
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
goto loop;
case scm_tcs_closures:
proc = SCM_CLOSURE_FORMALS (proc);
if (SCM_NULLP (proc))
break;
while (SCM_CONSP (proc))
{
++a;
proc = SCM_CDR (proc);
}
if (!SCM_NULLP (proc))
r = 1;
break;
case scm_tcs_struct:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
{
r = 1;
break;
}
else if (!SCM_I_OPERATORP (proc))
return SCM_BOOL_F;
proc = (SCM_I_ENTITYP (proc)
? SCM_ENTITY_PROCEDURE (proc)
: SCM_OPERATOR_PROCEDURE (proc));
a -= 1;
goto loop;
default:
return SCM_BOOL_F;
}
return scm_list_3 (SCM_I_MAKINUM (a), SCM_I_MAKINUM (o), scm_from_bool(r));
}
static SCM
scm_stand_in_scm_proc(SCM proc)
{
SCM answer;
answer = scm_assq (proc, scm_stand_in_procs);
if (scm_is_false (answer))
{
answer = scm_closure (scm_list_2 (SCM_EOL, SCM_BOOL_F), SCM_EOL);
scm_stand_in_procs = scm_acons (proc, answer, scm_stand_in_procs);
}
else
answer = SCM_CDR (answer);
return answer;
}
SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
(SCM proc),
"Return @var{obj}'s property list.")
#define FUNC_NAME s_scm_procedure_properties
{
SCM_VALIDATE_PROC (1, proc);
return scm_acons (scm_sym_arity, scm_i_procedure_arity (proc),
SCM_PROCPROPS (SCM_CLOSUREP (proc)
? proc
: scm_stand_in_scm_proc (proc)));
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
(SCM proc, SCM new_val),
"Set @var{obj}'s property list to @var{alist}.")
#define FUNC_NAME s_scm_set_procedure_properties_x
{
if (!SCM_CLOSUREP (proc))
proc = scm_stand_in_scm_proc(proc);
SCM_VALIDATE_CLOSURE (1, proc);
SCM_SETPROCPROPS (proc, new_val);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
(SCM p, SCM k),
"Return the property of @var{obj} with name @var{key}.")
#define FUNC_NAME s_scm_procedure_property
{
SCM assoc;
if (SCM_EQ_P (k, scm_sym_arity))
{
SCM arity;
SCM_ASSERT (scm_is_true (arity = scm_i_procedure_arity (p)),
p, SCM_ARG1, FUNC_NAME);
return arity;
}
SCM_VALIDATE_PROC (1, p);
assoc = scm_sloppy_assq (k,
SCM_PROCPROPS (SCM_CLOSUREP (p)
? p
: scm_stand_in_scm_proc (p)));
return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
(SCM p, SCM k, SCM v),
"In @var{obj}'s property list, set the property named @var{key} to\n"
"@var{value}.")
#define FUNC_NAME s_scm_set_procedure_property_x
{
SCM assoc;
if (!SCM_CLOSUREP (p))
p = scm_stand_in_scm_proc(p);
SCM_VALIDATE_CLOSURE (1, p);
if (SCM_EQ_P (k, scm_sym_arity))
SCM_MISC_ERROR ("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;
}
#undef FUNC_NAME
void
scm_init_procprop ()
{
#include "libguile/procprop.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|
