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 (let ((slot (make-instance (get-property pset :slot-class :symbol
74 :location (file-location location)
76 (with-slots (slots) class
77 (setf slots (append slots (list slot))))
80 (defmethod shared-initialize :after ((slot sod-slot) slot-names &key pset)
81 "This method does nothing.
83 It only exists so that it isn't an error to provide a `:pset' initarg
84 to (make-instance 'sod-slot ...)."
86 (declare (ignore slot-names pset)))
88 ;;;--------------------------------------------------------------------------
89 ;;; Slot initializers.
91 (defmethod make-sod-instance-initializer
92 ((class sod-class) nick name value pset &optional location)
93 (with-default-error-location (location)
94 (let* ((slot (find-instance-slot-by-name class nick name))
95 (initializer (and value
96 (make-sod-initializer-using-slot
97 class slot 'sod-instance-initializer
98 value pset (file-location location)))))
99 (with-slots (instance-initializers) class
101 (setf instance-initializers
102 (append instance-initializers (list initializer))))
105 (defmethod make-sod-class-initializer
106 ((class sod-class) nick name value pset &optional location)
107 (with-default-error-location (location)
108 (let* ((slot (find-class-slot-by-name class nick name))
109 (initializer (make-sod-initializer-using-slot
110 class slot 'sod-class-initializer
111 value pset (file-location location))))
112 (with-slots (class-initializers) class
113 (setf class-initializers
114 (append class-initializers (list initializer))))
117 (defmethod make-sod-initializer-using-slot
118 ((class sod-class) (slot sod-slot) init-class value pset location)
119 (make-instance (get-property pset :initializer-class :symbol init-class)
123 :location (file-location location)
126 (defmethod shared-initialize :after
127 ((init sod-initializer) slot-names &key pset)
128 "This method does nothing.
130 It only exists so that it isn't an error to provide a `:pset' initarg
131 to (make-instance 'sod-initializer ...)."
132 (declare (ignore slot-names pset))
135 ;;;--------------------------------------------------------------------------
138 (defmethod make-sod-message
139 ((class sod-class) name type pset &optional location)
140 (with-default-error-location (location)
141 (let* ((msg-class (or (get-property pset :message-class :symbol)
142 (and (get-property pset :combination :keyword)
143 'aggregating-message)
145 (message (make-instance msg-class
149 :location (file-location location)
151 (with-slots (messages) class
152 (setf messages (append messages (list message))))
155 (defmethod shared-initialize :after
156 ((message sod-message) slot-names &key pset)
157 (declare (ignore slot-names pset))
158 (with-slots ((type %type)) message
159 (check-message-type message type)))
161 (defmethod check-message-type ((message sod-message) (type c-function-type))
164 (defmethod check-message-type ((message sod-message) (type c-type))
165 (error "Messages must have function type, not ~A" type))
167 ;;;--------------------------------------------------------------------------
170 (defmethod make-sod-method
171 ((class sod-class) nick name type body pset &optional location)
172 (with-default-error-location (location)
173 (let* ((message (find-message-by-name class nick name))
174 (method (make-sod-method-using-message message class
176 (file-location location))))
177 (with-slots (methods) class
178 (setf methods (append methods (list method))))
181 (defmethod make-sod-method-using-message
182 ((message sod-message) (class sod-class) type body pset location)
183 (make-instance (or (get-property pset :method-class :symbol)
184 (sod-message-method-class message class pset))
189 :location (file-location location)
192 (defmethod sod-message-method-class
193 ((message sod-message) (class sod-class) pset)
194 (declare (ignore pset))
197 (defmethod shared-initialize :after
198 ((method sod-method) slot-names &key pset)
199 (declare (ignore slot-names pset))
201 ;; Check that the arguments are named if we have a method body.
202 (with-slots (body (type %type)) method
203 (unless (or (not body)
205 (or (eq arg :ellipsis)
207 (c-type-equal-p (argument-type arg)
209 (c-function-arguments type)))
210 (error "Abstract declarators not permitted in method definitions")))
212 ;; Check the method type.
213 (with-slots (message (type %type)) method
214 (check-method-type method message type)))
216 (defmethod check-method-type
217 ((method sod-method) (message sod-message) (type c-type))
218 (error "Methods must have function type, not ~A" type))
220 (export 'check-method-return-type)
221 (defun check-method-return-type (method-type wanted-type)
222 "Signal an error unless METHOD-TYPE does not return the WANTED-TYPE."
223 (let ((method-returns (c-type-subtype method-type)))
224 (unless (c-type-equal-p method-returns wanted-type)
225 (error "Method return type ~A should be ~A"
226 method-returns wanted-type))))
228 (export 'check-method-return-type-against-message)
229 (defun check-method-return-type-against-message (method-type message-type)
230 "Signal an error unless METHOD-TYPE and MESSAGE-TYPE return the same type."
231 (let ((message-returns (c-type-subtype message-type))
232 (method-returns (c-type-subtype method-type)))
233 (unless (c-type-equal-p message-returns method-returns)
234 (error "Method return type ~A doesn't match message ~A"
235 method-returns message-returns))))
237 (export 'check-method-argument-lists)
238 (defun check-method-argument-lists (method-type message-type)
239 "Signal an error unless METHOD-TYPE and MESSAGE-TYPE have matching argument
242 This checks that (a) the two types have matching lists of mandatory
243 arguments, and (b) that either both or neither types accept keyword
245 (let ((message-keywords-p (typep message-type 'c-keyword-function-type))
246 (method-keywords-p (typep method-type 'c-keyword-function-type)))
247 (cond (message-keywords-p
248 (unless method-keywords-p
249 (error "Method must declare a keyword argument list")))
251 (error "Method must not declare a keyword argument list"))))
252 (unless (argument-lists-compatible-p (c-function-arguments message-type)
253 (c-function-arguments method-type))
254 (error "Method arguments ~A don't match message ~A"
255 method-type message-type)))
257 (defmethod check-method-type
258 ((method sod-method) (message sod-message) (type c-function-type))
259 (with-slots ((msgtype %type)) message
260 (check-method-return-type-against-message type msgtype)
261 (check-method-argument-lists type msgtype)))
263 ;;;----- That's all, folks --------------------------------------------------