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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 | ||
dea4d055 MW |
31 | (defmethod shared-initialize :after ((class sod-class) slot-names &key pset) |
32 | "Specific behaviour for SOD class initialization. | |
33 | ||
34 | Properties inspected are as follows: | |
35 | ||
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. | |
39 | ||
40 | * `:nick' provides a nickname for the class. If unspecified, a default | |
41 | (the class's name, forced to lowercase) will be chosen in | |
42 | `finalize-sod-class'. | |
43 | ||
44 | * `:link' names the chained superclass. If unspecified, this class will | |
45 | be left at the head of its chain." | |
46 | ||
47 | ;; If no nickname, copy the class name. It won't be pretty, though. | |
48 | (default-slot-from-property (class 'nickname slot-names) | |
49 | (pset :nick :id) | |
50 | (string-downcase (slot-value class 'name))) | |
51 | ||
981b6fb6 MW |
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 | |
54 | ;; finalization. | |
dea4d055 | 55 | (default-slot-from-property (class 'metaclass slot-names) |
981b6fb6 | 56 | (pset :metaclass :id meta (find-sod-class meta))) |
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57 | |
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)) | |
61 | nil)) | |
62 | ||
63 | ;;;-------------------------------------------------------------------------- | |
64 | ;;; Slots. | |
65 | ||
66 | (defmethod make-sod-slot | |
67 | ((class sod-class) name type pset &optional location) | |
68 | (with-default-error-location (location) | |
52a79ab8 | 69 | (let ((slot (make-instance (get-property pset :slot-class :symbol |
dea4d055 MW |
70 | 'sod-slot) |
71 | :class class | |
72 | :name name | |
73 | :type type | |
74 | :location (file-location location) | |
75 | :pset pset))) | |
76 | (with-slots (slots) class | |
2e1a785d MW |
77 | (setf slots (append slots (list slot)))) |
78 | slot))) | |
dea4d055 MW |
79 | |
80 | (defmethod shared-initialize :after ((slot sod-slot) slot-names &key pset) | |
81 | "This method does nothing. | |
82 | ||
83 | It only exists so that it isn't an error to provide a `:pset' initarg | |
84 | to (make-instance 'sod-slot ...)." | |
85 | ||
86 | (declare (ignore slot-names pset))) | |
87 | ||
88 | ;;;-------------------------------------------------------------------------- | |
89 | ;;; Slot initializers. | |
90 | ||
91 | (defmethod make-sod-instance-initializer | |
a888e3ac | 92 | ((class sod-class) nick name value pset &optional location) |
dea4d055 MW |
93 | (with-default-error-location (location) |
94 | (let* ((slot (find-instance-slot-by-name class nick name)) | |
a888e3ac MW |
95 | (initializer (and value |
96 | (make-sod-initializer-using-slot | |
97 | class slot 'sod-instance-initializer | |
98 | value pset (file-location location))))) | |
dea4d055 | 99 | (with-slots (instance-initializers) class |
a888e3ac | 100 | |
dea4d055 | 101 | (setf instance-initializers |
2e1a785d MW |
102 | (append instance-initializers (list initializer)))) |
103 | initializer))) | |
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104 | |
105 | (defmethod make-sod-class-initializer | |
a888e3ac | 106 | ((class sod-class) nick name value pset &optional location) |
dea4d055 MW |
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 | |
a888e3ac | 111 | value pset (file-location location)))) |
dea4d055 MW |
112 | (with-slots (class-initializers) class |
113 | (setf class-initializers | |
2e1a785d MW |
114 | (append class-initializers (list initializer)))) |
115 | initializer))) | |
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116 | |
117 | (defmethod make-sod-initializer-using-slot | |
a888e3ac | 118 | ((class sod-class) (slot sod-slot) init-class value pset location) |
52a79ab8 | 119 | (make-instance (get-property pset :initializer-class :symbol init-class) |
dea4d055 MW |
120 | :class class |
121 | :slot slot | |
a888e3ac | 122 | :value value |
29ad689c | 123 | :location (file-location location) |
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124 | :pset pset)) |
125 | ||
126 | (defmethod shared-initialize :after | |
127 | ((init sod-initializer) slot-names &key pset) | |
128 | "This method does nothing. | |
129 | ||
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)) | |
133 | nil) | |
134 | ||
135 | ;;;-------------------------------------------------------------------------- | |
136 | ;;; Messages. | |
137 | ||
138 | (defmethod make-sod-message | |
139 | ((class sod-class) name type pset &optional location) | |
140 | (with-default-error-location (location) | |
d145f6df MW |
141 | (let* ((msg-class (or (get-property pset :message-class :symbol) |
142 | (and (get-property pset :combination :keyword) | |
143 | 'aggregating-message) | |
144 | 'standard-message)) | |
145 | (message (make-instance msg-class | |
146 | :class class | |
147 | :name name | |
148 | :type type | |
149 | :location (file-location location) | |
150 | :pset pset))) | |
dea4d055 | 151 | (with-slots (messages) class |
2e1a785d MW |
152 | (setf messages (append messages (list message)))) |
153 | message))) | |
dea4d055 MW |
154 | |
155 | (defmethod shared-initialize :after | |
156 | ((message sod-message) slot-names &key pset) | |
157 | (declare (ignore slot-names pset)) | |
4b8e5c03 | 158 | (with-slots ((type %type)) message |
dea4d055 MW |
159 | (check-message-type message type))) |
160 | ||
161 | (defmethod check-message-type ((message sod-message) (type c-function-type)) | |
162 | nil) | |
163 | ||
164 | (defmethod check-message-type ((message sod-message) (type c-type)) | |
165 | (error "Messages must have function type, not ~A" type)) | |
166 | ||
167 | ;;;-------------------------------------------------------------------------- | |
168 | ;;; Methods. | |
169 | ||
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 | |
175 | type body pset | |
176 | (file-location location)))) | |
177 | (with-slots (methods) class | |
2e1a785d MW |
178 | (setf methods (append methods (list method)))) |
179 | method))) | |
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180 | |
181 | (defmethod make-sod-method-using-message | |
182 | ((message sod-message) (class sod-class) type body pset location) | |
52a79ab8 | 183 | (make-instance (or (get-property pset :method-class :symbol) |
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184 | (sod-message-method-class message class pset)) |
185 | :message message | |
186 | :class class | |
187 | :type type | |
188 | :body body | |
29ad689c | 189 | :location (file-location location) |
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190 | :pset pset)) |
191 | ||
192 | (defmethod sod-message-method-class | |
193 | ((message sod-message) (class sod-class) pset) | |
194 | (declare (ignore pset)) | |
195 | 'sod-method) | |
196 | ||
197 | (defmethod shared-initialize :after | |
198 | ((method sod-method) slot-names &key pset) | |
199 | (declare (ignore slot-names pset)) | |
200 | ||
201 | ;; Check that the arguments are named if we have a method body. | |
4b8e5c03 | 202 | (with-slots (body (type %type)) method |
dea4d055 | 203 | (unless (or (not body) |
9ec578d9 | 204 | (every (lambda (arg) |
c07860af MW |
205 | (or (eq arg :ellipsis) |
206 | (argument-name arg) | |
e85df3ff MW |
207 | (c-type-equal-p (argument-type arg) |
208 | c-type-void))) | |
9ec578d9 | 209 | (c-function-arguments type))) |
dea4d055 MW |
210 | (error "Abstract declarators not permitted in method definitions"))) |
211 | ||
212 | ;; Check the method type. | |
4b8e5c03 | 213 | (with-slots (message (type %type)) method |
dea4d055 MW |
214 | (check-method-type method message type))) |
215 | ||
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)) | |
219 | ||
b70cb6d8 MW |
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)))) | |
227 | ||
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)))) | |
236 | ||
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 | |
240 | lists. | |
241 | ||
43073476 MW |
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 | |
244 | arguments." | |
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"))) | |
250 | (method-keywords-p | |
251 | (error "Method must not declare a keyword argument list")))) | |
b70cb6d8 MW |
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))) | |
256 | ||
dea4d055 MW |
257 | (defmethod check-method-type |
258 | ((method sod-method) (message sod-message) (type c-function-type)) | |
4b8e5c03 | 259 | (with-slots ((msgtype %type)) message |
b70cb6d8 MW |
260 | (check-method-return-type-against-message type msgtype) |
261 | (check-method-argument-lists type msgtype))) | |
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262 | |
263 | ;;;----- That's all, folks -------------------------------------------------- |