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234 lines
6.9 KiB
C
234 lines
6.9 KiB
C
/* Copyright (C) 1995,1996 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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/* This file and objects.h contains those minimal pieces of the Guile
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* Object Oriented Programming System which need to be included in
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* libguile. See the comments in objects.h.
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*/
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#include "_scm.h"
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#include "struct.h"
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#include "procprop.h"
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#include "objects.h"
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SCM scm_metaclass_standard;
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SCM scm_metaclass_operator;
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SCM_PROC (s_set_object_procedure_x, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x);
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SCM
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scm_set_object_procedure_x (SCM obj, SCM procs)
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{
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SCM proc[4], *pp, p, setp, arity;
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int i, a, r;
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SCM_ASSERT (SCM_NIMP (obj) && SCM_STRUCTP (obj)
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&& ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
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|| SCM_I_ENTITYP (obj)),
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obj,
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SCM_ARG1,
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s_set_object_procedure_x);
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for (i = 0; i < 4; ++i)
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proc[i] = SCM_BOOL_F;
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i = 0;
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while (SCM_NIMP (procs))
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{
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if (i == 4)
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scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x));
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p = SCM_CAR (procs);
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setp = 0;
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SCM_ASSERT (SCM_NIMP (p), p, SCM_ARG2 + i, s_set_object_procedure_x);
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if (SCM_CLOSUREP (p))
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{
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arity = scm_procedure_property (p, scm_sym_arity);
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a = SCM_INUM (SCM_CAR (arity));
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/* Closures have zero optional args */
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r = SCM_NFALSEP (SCM_CADDR (arity));
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if (a == 1 || (a <= 1 && r))
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{
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if (SCM_NFALSEP (proc[0]))
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goto ambiguous;
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proc[0] = setp = p;
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}
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if (a == 2 || (a <= 2 && r))
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{
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if (SCM_NFALSEP (proc[1]))
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goto ambiguous;
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proc[1] = setp = p;
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}
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if (a == 3 || (a <= 3 && r))
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{
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if (SCM_NFALSEP (proc[2]))
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goto ambiguous;
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proc[2] = setp = p;
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}
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if (a <= 4 && r)
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{
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if (SCM_NFALSEP (proc[3]))
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goto ambiguous;
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proc[3] = setp = p;
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}
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}
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else if (SCM_TYP7 (p) == scm_tc7_subr_1)
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{
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if (SCM_NFALSEP (proc[0]))
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goto ambiguous;
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proc[0] = setp = p;
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}
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else if (SCM_TYP7 (p) == scm_tc7_subr_2)
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{
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if (SCM_NFALSEP (proc[1]))
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goto ambiguous;
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proc[1] = setp = p;
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}
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else if (SCM_TYP7 (p) == scm_tc7_subr_3)
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{
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if (SCM_NFALSEP (proc[2]))
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goto ambiguous;
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proc[2] = setp = p;
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}
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else if (SCM_TYP7 (p) == scm_tc7_lsubr_2)
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{
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if (SCM_NFALSEP (proc[3]))
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{
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ambiguous:
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SCM_ASSERT (0, p, "Ambiguous procedure arities",
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s_set_object_procedure_x);
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}
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proc[3] = setp = p;
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}
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SCM_ASSERT (setp, p, SCM_ARG2 + i, s_set_object_procedure_x);
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++i;
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procs = SCM_CDR (procs);
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}
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pp = (SCM_I_ENTITYP (obj)
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? &SCM_ENTITY_PROC_0 (obj)
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: &SCM_OPERATOR_CLASS (obj)->proc0);
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for (i = 0; i < 4; ++i)
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*pp++ = proc[i];
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return SCM_UNSPECIFIED;
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}
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static SCM
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make_class_object (SCM meta,
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SCM pl,
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SCM layout,
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unsigned long flags,
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char* subr)
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{
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SCM c;
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SCM_ASSERT (SCM_NIMP (meta) && SCM_STRUCTP (meta), meta, SCM_ARG1, subr);
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SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout),
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layout,
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SCM_ARG2,
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subr);
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layout = scm_make_struct_layout (scm_string_append (SCM_LIST2 (pl, layout)));
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c = scm_make_struct (meta,
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SCM_INUM0,
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SCM_LIST4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL));
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SCM_SET_CLASS_FLAGS (c, flags);
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return c;
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}
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SCM_PROC (s_make_class_object, "make-class-object", 2, 0, 0, scm_make_class_object);
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SCM
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scm_make_class_object (SCM metaclass, SCM layout)
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{
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unsigned long flags = 0;
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if (metaclass == scm_metaclass_operator)
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flags = SCM_CLASSF_OPERATOR;
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return make_class_object (metaclass,
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scm_nullstr,
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layout,
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flags,
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s_make_class_object);
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}
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SCM_PROC (s_make_subclass_object, "make-subclass-object", 2, 0, 0, scm_make_subclass_object);
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SCM
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scm_make_subclass_object (SCM class, SCM layout)
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{
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SCM pl;
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SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class),
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class,
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SCM_ARG1,
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s_make_subclass_object);
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pl = SCM_STRUCT_DATA (class)[scm_vtable_index_layout];
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pl = scm_makfromstr (SCM_CHARS (pl), (scm_sizet) SCM_LENGTH (pl), 0);
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return make_class_object (scm_metaclass_standard,
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pl,
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layout,
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SCM_CLASS_FLAGS (class),
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s_make_subclass_object);
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}
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void
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scm_init_objects ()
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{
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SCM ms = scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT);
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SCM ml = scm_make_struct_layout (ms);
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SCM mt = scm_make_vtable_vtable (ml, SCM_INUM0,
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SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
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SCM os = scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT);
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SCM ol = scm_make_struct_layout (os);
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SCM ot = scm_make_vtable_vtable (ol, SCM_INUM0,
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SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
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SCM es = scm_makfrom0str (SCM_ENTITY_LAYOUT);
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SCM el = scm_make_struct_layout (es);
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SCM et = scm_make_struct (mt, SCM_INUM0,
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SCM_LIST4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL));
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scm_sysintern ("<standard-metaclass>", mt);
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scm_metaclass_standard = mt;
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scm_sysintern ("<operator-metaclass>", ot);
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scm_metaclass_operator = ot;
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SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY);
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scm_sysintern ("<entity-class>", et);
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#include "objects.x"
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}
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