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242 lines
6.5 KiB
C
242 lines
6.5 KiB
C
/* Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
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gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
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#include <stdio.h>
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#include "_scm.h"
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#include "alist.h"
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#include "eval.h"
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#include "procs.h"
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#include "gsubr.h"
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#include "objects.h"
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#include "scm_validate.h"
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#include "procprop.h"
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SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure");
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SCM_GLOBAL_SYMBOL (scm_sym_arity, "arity");
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SCM
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scm_i_procedure_arity (SCM proc)
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{
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int a = 0, o = 0, r = 0;
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if (SCM_IMP (proc))
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return SCM_BOOL_F;
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loop:
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switch (SCM_TYP7 (proc))
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{
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case scm_tc7_subr_1o:
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o = 1;
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case scm_tc7_subr_0:
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break;
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case scm_tc7_subr_2o:
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o = 1;
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case scm_tc7_subr_1:
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case scm_tc7_cxr:
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case scm_tc7_contin:
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a += 1;
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break;
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case scm_tc7_subr_2:
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a += 2;
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break;
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case scm_tc7_subr_3:
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a += 3;
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break;
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case scm_tc7_asubr:
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case scm_tc7_rpsubr:
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case scm_tc7_lsubr:
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r = 1;
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break;
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case scm_tc7_lsubr_2:
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a += 2;
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r = 1;
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break;
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#ifdef CCLO
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case scm_tc7_cclo:
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if (SCM_CCLO_SUBR (proc) == scm_f_gsubr_apply)
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{
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int type = SCM_INUM (SCM_GSUBR_TYPE (proc));
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a += SCM_GSUBR_REQ (type);
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o = SCM_GSUBR_OPT (type);
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r = SCM_GSUBR_REST (type);
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break;
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}
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proc = SCM_CCLO_SUBR (proc);
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a -= 1;
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goto loop;
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#endif
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case scm_tc7_pws:
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proc = SCM_PROCEDURE (proc);
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goto loop;
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case scm_tcs_closures:
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proc = SCM_CAR (SCM_CODE (proc));
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if (SCM_IMP (proc))
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break;
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while (SCM_CONSP (proc))
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{
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++a;
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proc = SCM_CDR (proc);
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}
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if (SCM_NIMP (proc))
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r = 1;
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break;
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case scm_tcs_cons_gloc:
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if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
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{
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r = 1;
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break;
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}
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else if (!SCM_I_OPERATORP (proc))
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return SCM_BOOL_F;
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proc = (SCM_I_ENTITYP (proc)
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? SCM_ENTITY_PROCEDURE (proc)
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: SCM_OPERATOR_PROCEDURE (proc));
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a -= 1;
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goto loop;
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default:
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return SCM_BOOL_F;
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}
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return SCM_LIST3 (SCM_MAKINUM (a),
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SCM_MAKINUM (o),
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SCM_BOOL(r));
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}
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static SCM
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scm_stand_in_scm_proc(SCM proc)
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{
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SCM answer;
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answer = scm_assoc (proc, scm_stand_in_procs);
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if (answer == SCM_BOOL_F)
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{
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answer = scm_closure (scm_listify (SCM_EOL, SCM_BOOL_F, SCM_UNDEFINED),
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SCM_EOL);
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scm_stand_in_procs = scm_cons (scm_cons (proc, answer),
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scm_stand_in_procs);
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}
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else
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answer = SCM_CDR (answer);
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return answer;
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}
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SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0,
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(SCM proc),
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"Return @var{obj}'s property list.")
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#define FUNC_NAME s_scm_procedure_properties
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{
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SCM_VALIDATE_PROC (1,proc);
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return scm_acons (scm_sym_arity, scm_i_procedure_arity (proc),
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SCM_PROCPROPS (SCM_CLOSUREP (proc)
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? proc
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: scm_stand_in_scm_proc (proc)));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0,
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(SCM proc, SCM new_val),
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"Set @var{obj}'s property list to @var{alist}.")
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#define FUNC_NAME s_scm_set_procedure_properties_x
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{
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if (!SCM_CLOSUREP (proc))
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proc = scm_stand_in_scm_proc(proc);
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SCM_VALIDATE_CLOSURE (1,proc);
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SCM_SETPROCPROPS (proc, new_val);
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0,
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(SCM p, SCM k),
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"Return the property of @var{obj} with name @var{key}.")
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#define FUNC_NAME s_scm_procedure_property
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{
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SCM assoc;
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if (k == scm_sym_arity)
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{
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SCM arity;
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SCM_ASSERT (SCM_NFALSEP (arity = scm_i_procedure_arity (p)),
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p, SCM_ARG1, FUNC_NAME);
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return arity;
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}
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SCM_VALIDATE_PROC (1,p);
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assoc = scm_sloppy_assq (k,
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SCM_PROCPROPS (SCM_CLOSUREP (p)
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? p
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: scm_stand_in_scm_proc (p)));
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return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0,
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(SCM p, SCM k, SCM v),
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"In @var{obj}'s property list, set the property named @var{key} to
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@var{value}.")
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#define FUNC_NAME s_scm_set_procedure_property_x
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{
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SCM assoc;
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if (!SCM_CLOSUREP (p))
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p = scm_stand_in_scm_proc(p);
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SCM_VALIDATE_CLOSURE (1,p);
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if (k == scm_sym_arity)
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SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
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assoc = scm_sloppy_assq (k, SCM_PROCPROPS (p));
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if (SCM_NIMP (assoc))
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SCM_SETCDR (assoc, v);
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else
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SCM_SETPROCPROPS (p, scm_acons (k, v, SCM_PROCPROPS (p)));
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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void
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scm_init_procprop ()
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{
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#include "procprop.x"
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}
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