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_entity_p
, "entity?", 1, 0, 0, scm_entity_p
);
62 scm_entity_p (SCM obj
)
64 return (SCM_NIMP (obj
) && SCM_STRUCTP (obj
) && SCM_I_ENTITYP (obj
)
69 SCM_PROC (s_set_object_procedure_x
, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x
);
72 scm_set_object_procedure_x (SCM obj
, SCM procs
)
74 SCM proc
[4], *pp
, p
, setp
, arity
;
76 SCM_ASSERT (SCM_NIMP (obj
) && SCM_STRUCTP (obj
)
77 && ((SCM_CLASS_FLAGS (obj
) & SCM_CLASSF_OPERATOR
)
78 || SCM_I_ENTITYP (obj
)),
81 s_set_object_procedure_x
);
82 for (i
= 0; i
< 4; ++i
)
85 while (SCM_NIMP (procs
))
88 scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x
));
91 SCM_ASSERT (SCM_NIMP (p
), p
, SCM_ARG2
+ i
, s_set_object_procedure_x
);
94 arity
= scm_procedure_property (p
, scm_sym_arity
);
95 a
= SCM_INUM (SCM_CAR (arity
));
96 /* Closures have zero optional args */
97 r
= SCM_NFALSEP (SCM_CADDR (arity
));
98 if (a
== 1 || (a
<= 1 && r
))
100 if (SCM_NFALSEP (proc
[0]))
104 if (a
== 2 || (a
<= 2 && r
))
106 if (SCM_NFALSEP (proc
[1]))
110 if (a
== 3 || (a
<= 3 && r
))
112 if (SCM_NFALSEP (proc
[2]))
118 if (SCM_NFALSEP (proc
[3]))
123 else if (SCM_TYP7 (p
) == scm_tc7_subr_1
)
125 if (SCM_NFALSEP (proc
[0]))
129 else if (SCM_TYP7 (p
) == scm_tc7_subr_2
)
131 if (SCM_NFALSEP (proc
[1]))
135 else if (SCM_TYP7 (p
) == scm_tc7_subr_3
)
137 if (SCM_NFALSEP (proc
[2]))
141 else if (SCM_TYP7 (p
) == scm_tc7_lsubr_2
)
143 if (SCM_NFALSEP (proc
[3]))
146 SCM_ASSERT (0, p
, "Ambiguous procedure arities",
147 s_set_object_procedure_x
);
151 SCM_ASSERT (setp
, p
, SCM_ARG2
+ i
, s_set_object_procedure_x
);
153 procs
= SCM_CDR (procs
);
155 pp
= (SCM_I_ENTITYP (obj
)
156 ? &SCM_ENTITY_PROC_0 (obj
)
157 : &SCM_OPERATOR_CLASS (obj
)->proc0
);
158 for (i
= 0; i
< 4; ++i
)
160 return SCM_UNSPECIFIED
;
164 scm_i_make_class_object (SCM meta
,
169 SCM layout
= scm_make_struct_layout (layout_string
);
170 c
= scm_make_struct (meta
,
172 SCM_LIST4 (layout
, SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
173 SCM_SET_CLASS_FLAGS (c
, flags
);
177 SCM_PROC (s_make_class_object
, "make-class-object", 2, 0, 0, scm_make_class_object
);
180 scm_make_class_object (SCM metaclass
, SCM layout
)
182 unsigned long flags
= 0;
183 SCM_ASSERT (SCM_NIMP (metaclass
) && SCM_STRUCTP (metaclass
),
184 metaclass
, SCM_ARG1
, s_make_class_object
);
185 SCM_ASSERT (SCM_NIMP (layout
) && SCM_STRINGP (layout
),
186 layout
, SCM_ARG2
, s_make_class_object
);
187 if (metaclass
== scm_metaclass_operator
)
188 flags
= SCM_CLASSF_OPERATOR
;
189 return scm_i_make_class_object (metaclass
, layout
, flags
);
192 SCM_PROC (s_make_subclass_object
, "make-subclass-object", 2, 0, 0, scm_make_subclass_object
);
195 scm_make_subclass_object (SCM
class, SCM layout
)
198 SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class),
201 s_make_subclass_object
);
202 SCM_ASSERT (SCM_NIMP (layout
) && SCM_STRINGP (layout
),
205 s_make_subclass_object
);
206 pl
= SCM_STRUCT_DATA (class)[scm_vtable_index_layout
];
207 /* Convert symbol->string */
208 pl
= scm_makfromstr (SCM_CHARS (pl
), (scm_sizet
) SCM_LENGTH (pl
), 0);
209 return scm_i_make_class_object (SCM_STRUCT_VTABLE (class),
210 scm_string_append (SCM_LIST2 (pl
, layout
)),
211 SCM_CLASS_FLAGS (class));
217 SCM ms
= scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT
);
218 SCM ml
= scm_make_struct_layout (ms
);
219 SCM mt
= scm_make_vtable_vtable (ml
, SCM_INUM0
,
220 SCM_LIST3 (SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
222 SCM os
= scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT
);
223 SCM ol
= scm_make_struct_layout (os
);
224 SCM ot
= scm_make_vtable_vtable (ol
, SCM_INUM0
,
225 SCM_LIST3 (SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
227 SCM es
= scm_makfrom0str (SCM_ENTITY_LAYOUT
);
228 SCM el
= scm_make_struct_layout (es
);
229 SCM et
= scm_make_struct (mt
, SCM_INUM0
,
230 SCM_LIST4 (el
, SCM_BOOL_F
, SCM_EOL
, SCM_EOL
));
232 scm_sysintern ("<class>", mt
);
233 scm_metaclass_standard
= mt
;
234 scm_sysintern ("<operator-class>", ot
);
235 scm_metaclass_operator
= ot
;
236 SCM_SET_CLASS_FLAGS (et
, SCM_CLASSF_OPERATOR
| SCM_CLASSF_ENTITY
);
237 scm_sysintern ("<entity>", et
);