[bpt/guile.git] / libguile / procprop.c

/*	Copyright (C) 1995,1996,1998 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.  */

/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
   gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */

\f

#include <stdio.h>
#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/root.h"
#include "libguile/vectors.h"

#include "libguile/validate.h"
#include "libguile/procprop.h"
\f

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_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;
      break;
    case scm_tc7_lsubr_2:
      a += 2;
      r = 1;
      break;
#ifdef CCLO
    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;
	}
      proc = SCM_CCLO_SUBR (proc);
      a -= 1;
      goto loop;
#endif
    case scm_tc7_pws:
      proc = SCM_PROCEDURE (proc);
      goto loop;
    case scm_tcs_closures:
      proc = SCM_CAR (SCM_CODE (proc));
      if (SCM_IMP (proc))
	break;
      while (SCM_CONSP (proc))
	{
	  ++a;
	  proc = SCM_CDR (proc);
	}
      if (SCM_NIMP (proc))
	r = 1;
      break;
    case scm_tcs_cons_gloc:
      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_LIST3 (SCM_MAKINUM (a),
		    SCM_MAKINUM (o),
		    SCM_BOOL(r));
}

static SCM
scm_stand_in_scm_proc(SCM proc)
{
  SCM answer;
  answer = scm_assoc (proc, scm_stand_in_procs);
  if (SCM_FALSEP (answer))
    {
      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_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_NFALSEP (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

\f


void
scm_init_procprop ()
{
#include "libguile/procprop.x"
}


/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/
Commit	Line	Data
7dc6e754	1	/* Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
0f2d19dd JB	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License as published by
	5	* the Free Software Foundation; either version 2, or (at your option)
	6	* any later version.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this software; see the file COPYING. If not, write to
82892bed JB	15	* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
82892bed JB	16	* Boston, MA 02111-1307 USA
0f2d19dd JB	17	*
	18	* As a special exception, the Free Software Foundation gives permission
	19	* for additional uses of the text contained in its release of GUILE.
	20	*
	21	* The exception is that, if you link the GUILE library with other files
	22	* to produce an executable, this does not by itself cause the
	23	* resulting executable to be covered by the GNU General Public License.
	24	* Your use of that executable is in no way restricted on account of
	25	* linking the GUILE library code into it.
	26	*
	27	* This exception does not however invalidate any other reasons why
	28	* the executable file might be covered by the GNU General Public License.
	29	*
	30	* This exception applies only to the code released by the
	31	* Free Software Foundation under the name GUILE. If you copy
	32	* code from other Free Software Foundation releases into a copy of
	33	* GUILE, as the General Public License permits, the exception does
	34	* not apply to the code that you add in this way. To avoid misleading
	35	* anyone as to the status of such modified files, you must delete
	36	* this exception notice from them.
	37	*
	38	* If you write modifications of your own for GUILE, it is your choice
	39	* whether to permit this exception to apply to your modifications.
82892bed	40	* If you do not wish that, delete this exception notice. */
1bbd0b84 GB	41
	42	/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
	43	gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
	44
0f2d19dd JB	45	\f
	46
	47	#include <stdio.h>
a0599745 MD	48	#include "libguile/_scm.h"
	49
	50	#include "libguile/alist.h"
	51	#include "libguile/eval.h"
	52	#include "libguile/procs.h"
	53	#include "libguile/gsubr.h"
	54	#include "libguile/objects.h"
	55	#include "libguile/root.h"
	56	#include "libguile/vectors.h"
	57
	58	#include "libguile/validate.h"
	59	#include "libguile/procprop.h"
0f2d19dd JB	60	\f
0f2d19dd JB	61
c083a529	62	SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
67e60655 MD	63	SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
67e60655 MD	64
08906709 MD	65	SCM
08906709 MD	66	scm_i_procedure_arity (SCM proc)
67e60655 MD	67	{
67e60655 MD	68	int a = 0, o = 0, r = 0;
08906709 MD	69	if (SCM_IMP (proc))
08906709 MD	70	return SCM_BOOL_F;
67e60655 MD	71	loop:
	72	switch (SCM_TYP7 (proc))
	73	{
	74	case scm_tc7_subr_1o:
	75	o = 1;
	76	case scm_tc7_subr_0:
	77	break;
	78	case scm_tc7_subr_2o:
	79	o = 1;
	80	case scm_tc7_subr_1:
	81	case scm_tc7_cxr:
	82	case scm_tc7_contin:
	83	a += 1;
	84	break;
	85	case scm_tc7_subr_2:
	86	a += 2;
	87	break;
	88	case scm_tc7_subr_3:
	89	a += 3;
	90	break;
	91	case scm_tc7_asubr:
	92	case scm_tc7_rpsubr:
	93	case scm_tc7_lsubr:
	94	r = 1;
91517e28	95	break;
67e60655 MD	96	case scm_tc7_lsubr_2:
67e60655 MD	97	a += 2;
91517e28	98	r = 1;
67e60655 MD	99	break;
	100	#ifdef CCLO
	101	case scm_tc7_cclo:
54778cd3	102	if (SCM_EQ_P (SCM_CCLO_SUBR (proc), scm_f_gsubr_apply))
67e60655 MD	103	{
67e60655 MD	104	int type = SCM_INUM (SCM_GSUBR_TYPE (proc));
08906709	105	a += SCM_GSUBR_REQ (type);
67e60655 MD	106	o = SCM_GSUBR_OPT (type);
	107	r = SCM_GSUBR_REST (type);
	108	break;
	109	}
	110	proc = SCM_CCLO_SUBR (proc);
	111	a -= 1;
	112	goto loop;
	113	#endif
dec118c8 MD	114	case scm_tc7_pws:
	115	proc = SCM_PROCEDURE (proc);
	116	goto loop;
67e60655 MD	117	case scm_tcs_closures:
	118	proc = SCM_CAR (SCM_CODE (proc));
	119	if (SCM_IMP (proc))
	120	break;
0c95b57d	121	while (SCM_CONSP (proc))
67e60655 MD	122	{
	123	++a;
	124	proc = SCM_CDR (proc);
	125	}
	126	if (SCM_NIMP (proc))
	127	r = 1;
	128	break;
08906709	129	case scm_tcs_cons_gloc:
815ce8d5 MD	130	if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
	131	{
	132	r = 1;
	133	break;
	134	}
	135	else if (!SCM_I_OPERATORP (proc))
08906709	136	return SCM_BOOL_F;
815ce8d5 MD	137	proc = (SCM_I_ENTITYP (proc)
	138	? SCM_ENTITY_PROCEDURE (proc)
	139	: SCM_OPERATOR_PROCEDURE (proc));
	140	a -= 1;
	141	goto loop;
08906709 MD	142	default:
08906709 MD	143	return SCM_BOOL_F;
67e60655 MD	144	}
	145	return SCM_LIST3 (SCM_MAKINUM (a),
	146	SCM_MAKINUM (o),
156dcb09	147	SCM_BOOL(r));
67e60655 MD	148	}
67e60655 MD	149
0f2d19dd	150	static SCM
1bbd0b84	151	scm_stand_in_scm_proc(SCM proc)
0f2d19dd JB	152	{
	153	SCM answer;
	154	answer = scm_assoc (proc, scm_stand_in_procs);
54778cd3	155	if (SCM_FALSEP (answer))
0f2d19dd JB	156	{
	157	answer = scm_closure (scm_listify (SCM_EOL, SCM_BOOL_F, SCM_UNDEFINED),
	158	SCM_EOL);
	159	scm_stand_in_procs = scm_cons (scm_cons (proc, answer),
	160	scm_stand_in_procs);
	161	}
	162	else
	163	answer = SCM_CDR (answer);
	164	return answer;
	165	}
	166
3b3b36dd	167	SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
1bbd0b84	168	(SCM proc),
b380b885	169	"Return @var{obj}'s property list.")
1bbd0b84	170	#define FUNC_NAME s_scm_procedure_properties
0f2d19dd	171	{
3b3b36dd	172	SCM_VALIDATE_PROC (1,proc);
67e60655	173	return scm_acons (scm_sym_arity, scm_i_procedure_arity (proc),
0c95b57d	174	SCM_PROCPROPS (SCM_CLOSUREP (proc)
67e60655 MD	175	? proc
67e60655 MD	176	: scm_stand_in_scm_proc (proc)));
0f2d19dd	177	}
1bbd0b84	178	#undef FUNC_NAME
0f2d19dd	179
3b3b36dd	180	SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
1bbd0b84	181	(SCM proc, SCM new_val),
b380b885	182	"Set @var{obj}'s property list to @var{alist}.")
1bbd0b84	183	#define FUNC_NAME s_scm_set_procedure_properties_x
0f2d19dd	184	{
0c95b57d	185	if (!SCM_CLOSUREP (proc))
0f2d19dd	186	proc = scm_stand_in_scm_proc(proc);
3b3b36dd	187	SCM_VALIDATE_CLOSURE (1,proc);
a6c64c3c	188	SCM_SETPROCPROPS (proc, new_val);
0f2d19dd JB	189	return SCM_UNSPECIFIED;
0f2d19dd JB	190	}
1bbd0b84	191	#undef FUNC_NAME
0f2d19dd	192
3b3b36dd	193	SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
1bbd0b84	194	(SCM p, SCM k),
b380b885	195	"Return the property of @var{obj} with name @var{key}.")
1bbd0b84	196	#define FUNC_NAME s_scm_procedure_property
0f2d19dd JB	197	{
0f2d19dd JB	198	SCM assoc;
54778cd3	199	if (SCM_EQ_P (k, scm_sym_arity))
08906709 MD	200	{
	201	SCM arity;
	202	SCM_ASSERT (SCM_NFALSEP (arity = scm_i_procedure_arity (p)),
1bbd0b84	203	p, SCM_ARG1, FUNC_NAME);
08906709 MD	204	return arity;
08906709 MD	205	}
3b3b36dd	206	SCM_VALIDATE_PROC (1,p);
67e60655	207	assoc = scm_sloppy_assq (k,
0c95b57d	208	SCM_PROCPROPS (SCM_CLOSUREP (p)
67e60655 MD	209	? p
67e60655 MD	210	: scm_stand_in_scm_proc (p)));
0f2d19dd JB	211	return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
0f2d19dd JB	212	}
1bbd0b84	213	#undef FUNC_NAME
0f2d19dd	214
3b3b36dd	215	SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
1bbd0b84	216	(SCM p, SCM k, SCM v),
b380b885 MD	217	"In @var{obj}'s property list, set the property named @var{key} to\n"
b380b885 MD	218	"@var{value}.")
1bbd0b84	219	#define FUNC_NAME s_scm_set_procedure_property_x
0f2d19dd JB	220	{
0f2d19dd JB	221	SCM assoc;
0c95b57d	222	if (!SCM_CLOSUREP (p))
0f2d19dd	223	p = scm_stand_in_scm_proc(p);
3b3b36dd	224	SCM_VALIDATE_CLOSURE (1,p);
54778cd3	225	if (SCM_EQ_P (k, scm_sym_arity))
1bbd0b84	226	SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
0f2d19dd JB	227	assoc = scm_sloppy_assq (k, SCM_PROCPROPS (p));
	228	if (SCM_NIMP (assoc))
	229	SCM_SETCDR (assoc, v);
	230	else
a6c64c3c	231	SCM_SETPROCPROPS (p, scm_acons (k, v, SCM_PROCPROPS (p)));
0f2d19dd JB	232	return SCM_UNSPECIFIED;
0f2d19dd JB	233	}
1bbd0b84	234	#undef FUNC_NAME
0f2d19dd JB	235
	236	\f
	237
1cc91f1b	238
0f2d19dd JB	239	void
0f2d19dd JB	240	scm_init_procprop ()
0f2d19dd	241	{
a0599745	242	#include "libguile/procprop.x"
0f2d19dd JB	243	}
0f2d19dd JB	244
89e00824 ML	245
	246	/*
	247	Local Variables:
	248	c-file-style: "gnu"
	249	End:
	250	*/