1 /* Copyright (C) 1995,1996 Free Software Foundation, Inc.
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)
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.
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
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
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.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
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.
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.
40 * If you do not wish that, delete this exception notice. */
43 /* This file and objects.h contains those minimal pieces of the Guile
44 * Object Oriented Programming System which need to be included in
45 * libguile. See the comments in objects.h.
56 SCM scm_metaclass_standard
;
57 SCM scm_metaclass_operator
;
59 SCM_PROC (s_set_object_procedure_x
, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x
);
62 scm_set_object_procedure_x (SCM obj
, SCM procs
)
64 SCM proc
[4], *pp
, p
, setp
, arity
;
66 SCM_ASSERT (SCM_NIMP (obj
) && SCM_STRUCTP (obj
)
67 && ((SCM_CLASS_FLAGS (obj
) & SCM_CLASSF_OPERATOR
)
68 || SCM_I_ENTITYP (obj
)),
71 s_set_object_procedure_x
);
72 for (i
= 0; i
< 4; ++i
)
75 while (SCM_NIMP (procs
))
78 scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x
));
81 SCM_ASSERT (SCM_NIMP (p
), p
, SCM_ARG2
+ i
, s_set_object_procedure_x
);
84 arity
= scm_procedure_property (p
, scm_sym_arity
);
85 a
= SCM_INUM (SCM_CAR (arity
));
86 /* Closures have zero optional args */
87 r
= SCM_NFALSEP (SCM_CADDR (arity
));
88 if (a
== 1 || (a
<= 1 && r
))
90 if (SCM_NFALSEP (proc
[0]))
94 if (a
== 2 || (a
<= 2 && r
))
96 if (SCM_NFALSEP (proc
[1]))
100 if (a
== 3 || (a
<= 3 && r
))
102 if (SCM_NFALSEP (proc
[2]))
108 if (SCM_NFALSEP (proc
[3]))
113 else if (SCM_TYP7 (p
) == scm_tc7_subr_1
)
115 if (SCM_NFALSEP (proc
[0]))
119 else if (SCM_TYP7 (p
) == scm_tc7_subr_2
)
121 if (SCM_NFALSEP (proc
[1]))
125 else if (SCM_TYP7 (p
) == scm_tc7_subr_3
)
127 if (SCM_NFALSEP (proc
[2]))
131 else if (SCM_TYP7 (p
) == scm_tc7_lsubr_2
)
133 if (SCM_NFALSEP (proc
[3]))
136 SCM_ASSERT (0, p
, "Ambiguous procedure arities",
137 s_set_object_procedure_x
);
141 SCM_ASSERT (setp
, p
, SCM_ARG2
+ i
, s_set_object_procedure_x
);
143 procs
= SCM_CDR (procs
);
145 pp
= (SCM_I_ENTITYP (obj
)
146 ? &SCM_ENTITY_PROC_0 (obj
)
147 : &SCM_OPERATOR_CLASS (obj
)->proc0
);
148 for (i
= 0; i
< 4; ++i
)
150 return SCM_UNSPECIFIED
;
154 make_class_object (SCM meta
,
161 SCM_ASSERT (SCM_NIMP (meta
) && SCM_STRUCTP (meta
), meta
, SCM_ARG1
, subr
);
162 SCM_ASSERT (SCM_NIMP (layout
) && SCM_STRINGP (layout
),
166 layout
= scm_make_struct_layout (scm_string_append (SCM_LIST2 (pl
, layout
)));
167 c
= scm_make_struct (meta
,
169 SCM_LIST4 (layout
, SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
170 SCM_SET_CLASS_FLAGS (c
, flags
);
174 SCM_PROC (s_make_class_object
, "make-class-object", 2, 0, 0, scm_make_class_object
);
177 scm_make_class_object (SCM metaclass
, SCM layout
)
179 unsigned long flags
= 0;
180 if (metaclass
== scm_metaclass_operator
)
181 flags
= SCM_CLASSF_OPERATOR
;
182 return make_class_object (metaclass
,
186 s_make_class_object
);
189 SCM_PROC (s_make_subclass_object
, "make-subclass-object", 2, 0, 0, scm_make_subclass_object
);
192 scm_make_subclass_object (SCM
class, SCM layout
)
195 SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class),
198 s_make_subclass_object
);
199 pl
= SCM_STRUCT_DATA (class)[scm_vtable_index_layout
];
200 pl
= scm_makfromstr (SCM_CHARS (pl
), (scm_sizet
) SCM_LENGTH (pl
), 0);
201 return make_class_object (scm_metaclass_standard
,
204 SCM_CLASS_FLAGS (class),
205 s_make_subclass_object
);
211 SCM ms
= scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT
);
212 SCM ml
= scm_make_struct_layout (ms
);
213 SCM mt
= scm_make_vtable_vtable (ml
, SCM_INUM0
,
214 SCM_LIST3 (SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
216 SCM os
= scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT
);
217 SCM ol
= scm_make_struct_layout (os
);
218 SCM ot
= scm_make_vtable_vtable (ol
, SCM_INUM0
,
219 SCM_LIST3 (SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
221 SCM es
= scm_makfrom0str (SCM_ENTITY_LAYOUT
);
222 SCM el
= scm_make_struct_layout (es
);
223 SCM et
= scm_make_struct (mt
, SCM_INUM0
,
224 SCM_LIST4 (el
, SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
226 scm_sysintern ("<standard-metaclass>", mt
);
227 scm_metaclass_standard
= mt
;
228 scm_sysintern ("<operator-metaclass>", ot
);
229 scm_metaclass_operator
= ot
;
230 SCM_SET_CLASS_FLAGS (et
, SCM_CLASSF_OPERATOR
| SCM_CLASSF_ENTITY
);
231 scm_sysintern ("<entity-class>", et
);