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1d9ee7c7 MD |
1 | /* Copyright (C) 1995,1996 Free Software Foundation, Inc. |
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 | |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | * Boston, MA 02111-1307 USA | |
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. | |
40 | * If you do not wish that, delete this exception notice. */ | |
41 | \f | |
42 | ||
da7f71d7 MD |
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. | |
1d9ee7c7 MD |
46 | */ |
47 | ||
48 | #include "_scm.h" | |
49 | ||
50 | #include "struct.h" | |
47b21050 | 51 | #include "procprop.h" |
1d9ee7c7 MD |
52 | |
53 | #include "objects.h" | |
54 | \f | |
55 | ||
56 | SCM scm_metaclass_standard; | |
da7f71d7 | 57 | SCM scm_metaclass_operator; |
1d9ee7c7 | 58 | |
47b21050 MD |
59 | SCM_PROC (s_set_object_procedure_x, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x); |
60 | ||
61 | SCM | |
62 | scm_set_object_procedure_x (SCM obj, SCM procs) | |
63 | { | |
64 | SCM proc[4], *pp, p, setp, arity; | |
65 | int i, a, r; | |
66 | SCM_ASSERT (SCM_NIMP (obj) && SCM_STRUCTP (obj) | |
3b7284cd | 67 | && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR) |
47b21050 MD |
68 | || SCM_I_ENTITYP (obj)), |
69 | obj, | |
70 | SCM_ARG1, | |
71 | s_set_object_procedure_x); | |
72 | for (i = 0; i < 4; ++i) | |
73 | proc[i] = SCM_BOOL_F; | |
74 | i = 0; | |
75 | while (SCM_NIMP (procs)) | |
76 | { | |
77 | if (i == 4) | |
78 | scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x)); | |
79 | p = SCM_CAR (procs); | |
80 | setp = 0; | |
81 | SCM_ASSERT (SCM_NIMP (p), p, SCM_ARG2 + i, s_set_object_procedure_x); | |
82 | if (SCM_CLOSUREP (p)) | |
83 | { | |
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)) | |
89 | { | |
90 | if (SCM_NFALSEP (proc[0])) | |
91 | goto ambiguous; | |
92 | proc[0] = setp = p; | |
93 | } | |
94 | if (a == 2 || (a <= 2 && r)) | |
95 | { | |
96 | if (SCM_NFALSEP (proc[1])) | |
97 | goto ambiguous; | |
98 | proc[1] = setp = p; | |
99 | } | |
100 | if (a == 3 || (a <= 3 && r)) | |
101 | { | |
102 | if (SCM_NFALSEP (proc[2])) | |
103 | goto ambiguous; | |
104 | proc[2] = setp = p; | |
105 | } | |
106 | if (a <= 4 && r) | |
107 | { | |
108 | if (SCM_NFALSEP (proc[3])) | |
109 | goto ambiguous; | |
110 | proc[3] = setp = p; | |
111 | } | |
112 | } | |
113 | else if (SCM_TYP7 (p) == scm_tc7_subr_1) | |
114 | { | |
115 | if (SCM_NFALSEP (proc[0])) | |
116 | goto ambiguous; | |
117 | proc[0] = setp = p; | |
118 | } | |
119 | else if (SCM_TYP7 (p) == scm_tc7_subr_2) | |
120 | { | |
121 | if (SCM_NFALSEP (proc[1])) | |
122 | goto ambiguous; | |
123 | proc[1] = setp = p; | |
124 | } | |
125 | else if (SCM_TYP7 (p) == scm_tc7_subr_3) | |
126 | { | |
127 | if (SCM_NFALSEP (proc[2])) | |
128 | goto ambiguous; | |
129 | proc[2] = setp = p; | |
130 | } | |
131 | else if (SCM_TYP7 (p) == scm_tc7_lsubr_2) | |
132 | { | |
133 | if (SCM_NFALSEP (proc[3])) | |
134 | { | |
135 | ambiguous: | |
136 | SCM_ASSERT (0, p, "Ambiguous procedure arities", | |
137 | s_set_object_procedure_x); | |
138 | } | |
139 | proc[3] = setp = p; | |
140 | } | |
141 | SCM_ASSERT (setp, p, SCM_ARG2 + i, s_set_object_procedure_x); | |
142 | ++i; | |
143 | procs = SCM_CDR (procs); | |
144 | } | |
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) | |
149 | *pp++ = proc[i]; | |
150 | return SCM_UNSPECIFIED; | |
151 | } | |
152 | ||
153 | static SCM | |
154 | make_class_object (SCM meta, | |
155 | SCM pl, | |
156 | SCM layout, | |
157 | unsigned long flags, | |
158 | char* subr) | |
159 | { | |
160 | SCM c; | |
161 | SCM_ASSERT (SCM_NIMP (meta) && SCM_STRUCTP (meta), meta, SCM_ARG1, subr); | |
162 | SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout), | |
163 | layout, | |
164 | SCM_ARG2, | |
165 | subr); | |
166 | layout = scm_make_struct_layout (scm_string_append (SCM_LIST2 (pl, layout))); | |
167 | c = scm_make_struct (meta, | |
168 | SCM_INUM0, | |
169 | SCM_LIST4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL)); | |
170 | SCM_SET_CLASS_FLAGS (c, flags); | |
171 | return c; | |
172 | } | |
173 | ||
174 | SCM_PROC (s_make_class_object, "make-class-object", 2, 0, 0, scm_make_class_object); | |
175 | ||
176 | SCM | |
177 | scm_make_class_object (SCM metaclass, SCM layout) | |
178 | { | |
179 | unsigned long flags = 0; | |
180 | if (metaclass == scm_metaclass_operator) | |
181 | flags = SCM_CLASSF_OPERATOR; | |
182 | return make_class_object (metaclass, | |
183 | scm_nullstr, | |
184 | layout, | |
185 | flags, | |
186 | s_make_class_object); | |
187 | } | |
188 | ||
189 | SCM_PROC (s_make_subclass_object, "make-subclass-object", 2, 0, 0, scm_make_subclass_object); | |
190 | ||
191 | SCM | |
192 | scm_make_subclass_object (SCM class, SCM layout) | |
193 | { | |
194 | SCM pl; | |
195 | SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class), | |
196 | class, | |
197 | SCM_ARG1, | |
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, | |
202 | pl, | |
203 | layout, | |
204 | SCM_CLASS_FLAGS (class), | |
205 | s_make_subclass_object); | |
206 | } | |
207 | ||
1d9ee7c7 MD |
208 | void |
209 | scm_init_objects () | |
210 | { | |
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)); | |
215 | ||
da7f71d7 MD |
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)); | |
220 | ||
1d9ee7c7 MD |
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)); | |
225 | ||
226 | scm_sysintern ("<standard-metaclass>", mt); | |
227 | scm_metaclass_standard = mt; | |
da7f71d7 MD |
228 | scm_sysintern ("<operator-metaclass>", ot); |
229 | scm_metaclass_operator = ot; | |
230 | SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY); | |
1d9ee7c7 | 231 | scm_sysintern ("<entity-class>", et); |
47b21050 MD |
232 | |
233 | #include "objects.x" | |
1d9ee7c7 | 234 | } |