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1 | ;;; -*-lisp-*- |
2 | ;;; | |
3 | ;;; Class construction protocol implementation | |
4 | ;;; | |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
e0808c47 | 10 | ;;; This file is part of the Sensible Object Design, an object system for C. |
dea4d055 MW |
11 | ;;; |
12 | ;;; SOD is free software; you can redistribute it and/or modify | |
13 | ;;; it under the terms of the GNU General Public License as published by | |
14 | ;;; the Free Software Foundation; either version 2 of the License, or | |
15 | ;;; (at your option) any later version. | |
16 | ;;; | |
17 | ;;; SOD is distributed in the hope that it will be useful, | |
18 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;;; GNU General Public License for more details. | |
21 | ;;; | |
22 | ;;; You should have received a copy of the GNU General Public License | |
23 | ;;; along with SOD; if not, write to the Free Software Foundation, | |
24 | ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | ||
26 | (cl:in-package #:sod) | |
27 | ||
28 | ;;;-------------------------------------------------------------------------- | |
29 | ;;; Classes. | |
30 | ||
f95caf08 MW |
31 | (defun maximum (items order what) |
32 | "Return a maximum item according to the non-strict partial ORDER." | |
33 | (reduce (lambda (best this) | |
34 | (cond ((funcall order best this) best) | |
35 | ((funcall order this best) this) | |
36 | (t (error "Unable to choose best ~A." what)))) | |
37 | items)) | |
38 | ||
dea4d055 MW |
39 | (defmethod guess-metaclass ((class sod-class)) |
40 | "Default metaclass-guessing function for classes. | |
41 | ||
42 | Return the most specific metaclass of any of the CLASS's direct | |
43 | superclasses." | |
f95caf08 MW |
44 | (maximum (mapcar #'sod-class-metaclass |
45 | (sod-class-direct-superclasses class)) | |
46 | #'sod-subclass-p | |
47 | (format nil "metaclass for `~A'" class))) | |
dea4d055 MW |
48 | |
49 | (defmethod shared-initialize :after ((class sod-class) slot-names &key pset) | |
50 | "Specific behaviour for SOD class initialization. | |
51 | ||
52 | Properties inspected are as follows: | |
53 | ||
54 | * `:metaclass' names the metaclass to use. If unspecified, nil is | |
55 | stored, and (unless you intervene later) `guess-metaclass' will be | |
56 | called by `finalize-sod-class' to find a suitable default. | |
57 | ||
58 | * `:nick' provides a nickname for the class. If unspecified, a default | |
59 | (the class's name, forced to lowercase) will be chosen in | |
60 | `finalize-sod-class'. | |
61 | ||
62 | * `:link' names the chained superclass. If unspecified, this class will | |
63 | be left at the head of its chain." | |
64 | ||
65 | ;; If no nickname, copy the class name. It won't be pretty, though. | |
66 | (default-slot-from-property (class 'nickname slot-names) | |
67 | (pset :nick :id) | |
68 | (string-downcase (slot-value class 'name))) | |
69 | ||
70 | ;; If no metaclass, guess one in a (Lisp) class-specific way. | |
71 | (default-slot-from-property (class 'metaclass slot-names) | |
72 | (pset :metaclass :id meta (find-sod-class meta)) | |
f95caf08 MW |
73 | (and (sod-class-direct-superclasses class) |
74 | (guess-metaclass class))) | |
dea4d055 MW |
75 | |
76 | ;; If no chain-link, then start a new chain here. | |
77 | (default-slot-from-property (class 'chain-link slot-names) | |
78 | (pset :link :id link (find-sod-class link)) | |
79 | nil)) | |
80 | ||
81 | ;;;-------------------------------------------------------------------------- | |
82 | ;;; Slots. | |
83 | ||
84 | (defmethod make-sod-slot | |
85 | ((class sod-class) name type pset &optional location) | |
86 | (with-default-error-location (location) | |
52a79ab8 | 87 | (let ((slot (make-instance (get-property pset :slot-class :symbol |
dea4d055 MW |
88 | 'sod-slot) |
89 | :class class | |
90 | :name name | |
91 | :type type | |
92 | :location (file-location location) | |
93 | :pset pset))) | |
94 | (with-slots (slots) class | |
2e1a785d MW |
95 | (setf slots (append slots (list slot)))) |
96 | slot))) | |
dea4d055 MW |
97 | |
98 | (defmethod shared-initialize :after ((slot sod-slot) slot-names &key pset) | |
99 | "This method does nothing. | |
100 | ||
101 | It only exists so that it isn't an error to provide a `:pset' initarg | |
102 | to (make-instance 'sod-slot ...)." | |
103 | ||
104 | (declare (ignore slot-names pset))) | |
105 | ||
106 | ;;;-------------------------------------------------------------------------- | |
107 | ;;; Slot initializers. | |
108 | ||
109 | (defmethod make-sod-instance-initializer | |
110 | ((class sod-class) nick name value-kind value-form pset | |
111 | &optional location) | |
112 | (with-default-error-location (location) | |
113 | (let* ((slot (find-instance-slot-by-name class nick name)) | |
114 | (initializer (make-sod-initializer-using-slot | |
115 | class slot 'sod-instance-initializer | |
116 | value-kind value-form pset | |
117 | (file-location location)))) | |
118 | (with-slots (instance-initializers) class | |
119 | (setf instance-initializers | |
2e1a785d MW |
120 | (append instance-initializers (list initializer)))) |
121 | initializer))) | |
dea4d055 MW |
122 | |
123 | (defmethod make-sod-class-initializer | |
124 | ((class sod-class) nick name value-kind value-form pset | |
125 | &optional location) | |
126 | (with-default-error-location (location) | |
127 | (let* ((slot (find-class-slot-by-name class nick name)) | |
128 | (initializer (make-sod-initializer-using-slot | |
129 | class slot 'sod-class-initializer | |
130 | value-kind value-form pset | |
131 | (file-location location)))) | |
132 | (with-slots (class-initializers) class | |
133 | (setf class-initializers | |
2e1a785d MW |
134 | (append class-initializers (list initializer)))) |
135 | initializer))) | |
dea4d055 MW |
136 | |
137 | (defmethod make-sod-initializer-using-slot | |
138 | ((class sod-class) (slot sod-slot) | |
139 | init-class value-kind value-form pset location) | |
52a79ab8 | 140 | (make-instance (get-property pset :initializer-class :symbol init-class) |
dea4d055 MW |
141 | :class class |
142 | :slot slot | |
143 | :value-kind value-kind | |
144 | :value-form value-form | |
145 | :location location | |
146 | :pset pset)) | |
147 | ||
148 | (defmethod shared-initialize :after | |
149 | ((init sod-initializer) slot-names &key pset) | |
150 | "This method does nothing. | |
151 | ||
152 | It only exists so that it isn't an error to provide a `:pset' initarg | |
153 | to (make-instance 'sod-initializer ...)." | |
154 | (declare (ignore slot-names pset)) | |
155 | nil) | |
156 | ||
157 | ;;;-------------------------------------------------------------------------- | |
158 | ;;; Messages. | |
159 | ||
160 | (defmethod make-sod-message | |
161 | ((class sod-class) name type pset &optional location) | |
162 | (with-default-error-location (location) | |
d145f6df MW |
163 | (let* ((msg-class (or (get-property pset :message-class :symbol) |
164 | (and (get-property pset :combination :keyword) | |
165 | 'aggregating-message) | |
166 | 'standard-message)) | |
167 | (message (make-instance msg-class | |
168 | :class class | |
169 | :name name | |
170 | :type type | |
171 | :location (file-location location) | |
172 | :pset pset))) | |
dea4d055 | 173 | (with-slots (messages) class |
2e1a785d MW |
174 | (setf messages (append messages (list message)))) |
175 | message))) | |
dea4d055 MW |
176 | |
177 | (defmethod shared-initialize :after | |
178 | ((message sod-message) slot-names &key pset) | |
179 | (declare (ignore slot-names pset)) | |
4b8e5c03 | 180 | (with-slots ((type %type)) message |
dea4d055 MW |
181 | (check-message-type message type))) |
182 | ||
183 | (defmethod check-message-type ((message sod-message) (type c-function-type)) | |
184 | nil) | |
185 | ||
186 | (defmethod check-message-type ((message sod-message) (type c-type)) | |
187 | (error "Messages must have function type, not ~A" type)) | |
188 | ||
189 | ;;;-------------------------------------------------------------------------- | |
190 | ;;; Methods. | |
191 | ||
192 | (defmethod make-sod-method | |
193 | ((class sod-class) nick name type body pset &optional location) | |
194 | (with-default-error-location (location) | |
195 | (let* ((message (find-message-by-name class nick name)) | |
196 | (method (make-sod-method-using-message message class | |
197 | type body pset | |
198 | (file-location location)))) | |
199 | (with-slots (methods) class | |
2e1a785d MW |
200 | (setf methods (append methods (list method)))) |
201 | method))) | |
dea4d055 MW |
202 | |
203 | (defmethod make-sod-method-using-message | |
204 | ((message sod-message) (class sod-class) type body pset location) | |
52a79ab8 | 205 | (make-instance (or (get-property pset :method-class :symbol) |
dea4d055 MW |
206 | (sod-message-method-class message class pset)) |
207 | :message message | |
208 | :class class | |
209 | :type type | |
210 | :body body | |
211 | :location location | |
212 | :pset pset)) | |
213 | ||
214 | (defmethod sod-message-method-class | |
215 | ((message sod-message) (class sod-class) pset) | |
216 | (declare (ignore pset)) | |
217 | 'sod-method) | |
218 | ||
219 | (defmethod shared-initialize :after | |
220 | ((method sod-method) slot-names &key pset) | |
221 | (declare (ignore slot-names pset)) | |
222 | ||
223 | ;; Check that the arguments are named if we have a method body. | |
4b8e5c03 | 224 | (with-slots (body (type %type)) method |
dea4d055 | 225 | (unless (or (not body) |
9ec578d9 | 226 | (every (lambda (arg) |
c07860af MW |
227 | (or (eq arg :ellipsis) |
228 | (argument-name arg) | |
9ec578d9 MW |
229 | (eq (argument-type arg) (c-type void)))) |
230 | (c-function-arguments type))) | |
dea4d055 MW |
231 | (error "Abstract declarators not permitted in method definitions"))) |
232 | ||
233 | ;; Check the method type. | |
4b8e5c03 | 234 | (with-slots (message (type %type)) method |
dea4d055 MW |
235 | (check-method-type method message type))) |
236 | ||
237 | (defmethod check-method-type | |
238 | ((method sod-method) (message sod-message) (type c-type)) | |
239 | (error "Methods must have function type, not ~A" type)) | |
240 | ||
241 | (defmethod check-method-type | |
242 | ((method sod-method) (message sod-message) (type c-function-type)) | |
4b8e5c03 | 243 | (with-slots ((msgtype %type)) message |
dea4d055 MW |
244 | (unless (c-type-equal-p (c-type-subtype msgtype) |
245 | (c-type-subtype type)) | |
246 | (error "Method return type ~A doesn't match message ~A" | |
247 | (c-type-subtype msgtype) (c-type-subtype type))) | |
248 | (unless (argument-lists-compatible-p (c-function-arguments msgtype) | |
249 | (c-function-arguments type)) | |
250 | (error "Method arguments ~A don't match message ~A" type msgtype)))) | |
251 | ||
252 | ;;;----- That's all, folks -------------------------------------------------- |