3 ;;; Class construction protocol implementation
5 ;;; (c) 2009 Straylight/Edgeware
8 ;;;----- Licensing notice ---------------------------------------------------
10 ;;; This file is part of the Sensible Object Design, an object system for C.
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.
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.
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.
28 ;;;--------------------------------------------------------------------------
31 (defmethod shared-initialize :after ((class sod-class) slot-names &key pset)
32 "Specific behaviour for SOD class initialization.
34 Properties inspected are as follows:
36 * `:metaclass' names the metaclass to use. If unspecified, nil is
37 stored, and (unless you intervene later) `guess-metaclass' will be
38 called by `finalize-sod-class' to find a suitable default.
40 * `:nick' provides a nickname for the class. If unspecified, a default
41 (the class's name, forced to lowercase) will be chosen in
44 * `:link' names the chained superclass. If unspecified, this class will
45 be left at the head of its chain."
47 ;; If no nickname, copy the class name. It won't be pretty, though.
48 (default-slot-from-property (class 'nickname slot-names)
50 (string-downcase (slot-value class 'name)))
52 ;; Set the metaclass if the appropriate property has been provided;
53 ;; otherwise leave it unbound for now, and we'll sort out the mess during
55 (default-slot-from-property (class 'metaclass slot-names)
56 (pset :metaclass :id meta (find-sod-class meta)))
58 ;; If no chain-link, then start a new chain here.
59 (default-slot-from-property (class 'chain-link slot-names)
60 (pset :link :id link (find-sod-class link))
63 ;;;--------------------------------------------------------------------------
66 (defmethod make-sod-slot
67 ((class sod-class) name type pset &optional location)
68 (with-default-error-location (location)
69 (when (typep type 'c-function-type)
70 (error "Slot declarations cannot have function type"))
71 (let ((slot (make-instance (get-property pset :slot-class :symbol
76 :location (file-location location)
78 (initarg-name (get-property pset :initarg :id)))
79 (with-slots (slots) class
80 (setf slots (append slots (list slot))))
82 (make-sod-slot-initarg-using-slot class initarg-name
86 (defmethod shared-initialize :after ((slot sod-slot) slot-names &key pset)
87 "This method does nothing.
89 It only exists so that it isn't an error to provide a `:pset' initarg
90 to (make-instance 'sod-slot ...)."
92 (declare (ignore slot-names pset)))
94 ;;;--------------------------------------------------------------------------
95 ;;; Slot initializers.
97 (defmethod make-sod-instance-initializer
98 ((class sod-class) nick name value pset &optional location)
99 (with-default-error-location (location)
100 (let* ((slot (find-instance-slot-by-name class nick name))
101 (initarg-name (get-property pset :initarg :id))
102 (initializer (and value
103 (make-sod-initializer-using-slot
104 class slot 'sod-instance-initializer
105 value pset (file-location location)))))
106 (with-slots (instance-initializers) class
107 (unless (or initarg-name initializer)
108 (error "Slot initializer declaration with no effect"))
110 (make-sod-slot-initarg-using-slot class initarg-name slot
113 (setf instance-initializers
114 (append instance-initializers (list initializer)))))
117 (defmethod make-sod-class-initializer
118 ((class sod-class) nick name value pset &optional location)
119 (with-default-error-location (location)
120 (let* ((slot (find-class-slot-by-name class nick name))
121 (initializer (make-sod-initializer-using-slot
122 class slot 'sod-class-initializer
123 value pset (file-location location))))
124 (with-slots (class-initializers) class
125 (setf class-initializers
126 (append class-initializers (list initializer))))
129 (defmethod make-sod-initializer-using-slot
130 ((class sod-class) (slot sod-slot) init-class value pset location)
131 (make-instance (get-property pset :initializer-class :symbol init-class)
135 :location (file-location location)
138 (defmethod shared-initialize :after
139 ((init sod-initializer) slot-names &key pset)
140 "This method does nothing.
142 It only exists so that it isn't an error to provide a `:pset' initarg
143 to (make-instance 'sod-initializer ...)."
144 (declare (ignore slot-names pset))
147 (defmethod make-sod-user-initarg
148 ((class sod-class) name type pset &optional default location)
149 (with-slots (initargs) class
150 (push (make-instance (get-property pset :initarg-class :symbol
152 :location (file-location location)
153 :class class :name name :type type :default default)
156 (defmethod make-sod-slot-initarg
157 ((class sod-class) name nick slot-name pset &optional location)
158 (let ((slot (find-instance-slot-by-name class nick slot-name)))
159 (make-sod-slot-initarg-using-slot class name slot pset location)))
161 (defmethod make-sod-slot-initarg-using-slot
162 ((class sod-class) name (slot sod-slot) pset &optional location)
163 (with-slots (initargs) class
164 (with-slots ((type %type)) slot
165 (push (make-instance (get-property pset :initarg-class :symbol
167 :location (file-location location)
168 :class class :name name :type type :slot slot)
171 (defmethod sod-initarg-default ((initarg sod-initarg)) nil)
173 (defmethod sod-initarg-argument ((initarg sod-initarg))
174 (make-argument (sod-initarg-name initarg)
175 (sod-initarg-type initarg)
176 (sod-initarg-default initarg)))
178 ;;;--------------------------------------------------------------------------
179 ;;; Initialization and teardown fragments.
181 (defmethod make-sod-class-initfrag
182 ((class sod-class) frag pset &optional location)
183 (declare (ignore pset location))
184 (with-slots (initfrags) class
185 (setf initfrags (append initfrags (list frag)))))
187 (defmethod make-sod-class-tearfrag
188 ((class sod-class) frag pset &optional location)
189 (declare (ignore pset location))
190 (with-slots (tearfrags) class
191 (setf tearfrags (append tearfrags (list frag)))))
193 ;;;--------------------------------------------------------------------------
196 (defmethod make-sod-message
197 ((class sod-class) name type pset &optional location)
198 (with-default-error-location (location)
199 (let* ((msg-class (or (get-property pset :message-class :symbol)
200 (and (get-property pset :combination :keyword)
201 'aggregating-message)
203 (message (make-instance msg-class
207 :location (file-location location)
209 (with-slots (messages) class
210 (setf messages (append messages (list message))))
213 (defmethod shared-initialize :after
214 ((message sod-message) slot-names &key pset)
215 (declare (ignore slot-names pset))
216 (with-slots ((type %type)) message
217 (check-message-type message type)))
219 (defmethod check-message-type ((message sod-message) (type c-function-type))
222 (defmethod check-message-type ((message sod-message) (type c-type))
223 (error "Messages must have function type, not ~A" type))
225 ;;;--------------------------------------------------------------------------
228 (defmethod make-sod-method
229 ((class sod-class) nick name type body pset &optional location)
230 (with-default-error-location (location)
231 (let* ((message (find-message-by-name class nick name))
232 (method (make-sod-method-using-message message class
234 (file-location location))))
235 (with-slots (methods) class
236 (setf methods (append methods (list method))))
239 (defmethod make-sod-method-using-message
240 ((message sod-message) (class sod-class) type body pset location)
241 (make-instance (or (get-property pset :method-class :symbol)
242 (sod-message-method-class message class pset))
247 :location (file-location location)
250 (defmethod sod-message-method-class
251 ((message sod-message) (class sod-class) pset)
252 (declare (ignore pset))
255 (defmethod shared-initialize :after
256 ((method sod-method) slot-names &key pset)
257 (declare (ignore slot-names pset))
259 ;; Check that the arguments are named if we have a method body.
260 (with-slots (body (type %type)) method
261 (unless (or (not body)
263 (or (eq arg :ellipsis)
265 (c-type-equal-p (argument-type arg)
267 (c-function-arguments type)))
268 (error "Abstract declarators not permitted in method definitions")))
270 ;; Check the method type.
271 (with-slots (message (type %type)) method
272 (check-method-type method message type)))
274 (defmethod check-method-type
275 ((method sod-method) (message sod-message) (type c-type))
276 (error "Methods must have function type, not ~A" type))
278 (export 'check-method-return-type)
279 (defun check-method-return-type (method-type wanted-type)
280 "Signal an error unless METHOD-TYPE does not return the WANTED-TYPE."
281 (let ((method-returns (c-type-subtype method-type)))
282 (unless (c-type-equal-p method-returns wanted-type)
283 (error "Method return type ~A should be ~A"
284 method-returns wanted-type))))
286 (export 'check-method-return-type-against-message)
287 (defun check-method-return-type-against-message (method-type message-type)
288 "Signal an error unless METHOD-TYPE and MESSAGE-TYPE return the same type."
289 (let ((message-returns (c-type-subtype message-type))
290 (method-returns (c-type-subtype method-type)))
291 (unless (c-type-equal-p message-returns method-returns)
292 (error "Method return type ~A doesn't match message ~A"
293 method-returns message-returns))))
295 (export 'check-method-argument-lists)
296 (defun check-method-argument-lists (method-type message-type)
297 "Signal an error unless METHOD-TYPE and MESSAGE-TYPE have matching argument
300 This checks that (a) the two types have matching lists of mandatory
301 arguments, and (b) that either both or neither types accept keyword
303 (let ((message-keywords-p (typep message-type 'c-keyword-function-type))
304 (method-keywords-p (typep method-type 'c-keyword-function-type)))
305 (cond (message-keywords-p
306 (unless method-keywords-p
307 (error "Method must declare a keyword argument list")))
309 (error "Method must not declare a keyword argument list"))))
310 (unless (argument-lists-compatible-p (c-function-arguments message-type)
311 (c-function-arguments method-type))
312 (error "Method arguments ~A don't match message ~A"
313 method-type message-type)))
315 (defmethod check-method-type
316 ((method sod-method) (message sod-message) (type c-function-type))
317 (with-slots ((msgtype %type)) message
318 (check-method-return-type-against-message type msgtype)
319 (check-method-argument-lists type msgtype)))
321 ;;;----- That's all, folks --------------------------------------------------