1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
(in-package #:mulk.objective-cl)
;;; (@* "Low-level Data Conversion")
(declaim (ftype (function (*)
(values foreign-pointer &rest nil))
obj-data->lisp))
(defun lisp->obj-data (value)
(let ((obj-data (foreign-alloc 'obj-data))
(type-name (lisp-value->type-name value)))
(with-foreign-slots ((type data) obj-data obj-data)
(setf (foreign-slot-value data
'obj-data-union
(type-name->slot-name type-name))
(typecase value
(symbol (selector value))
((or id objc-class selector exception)
(pointer-to value))
(string (foreign-string-alloc value))
(otherwise value)))
(setf type
(foreign-string-alloc (type-name->type-id type-name))))
obj-data))
(declaim (ftype (function (foreign-pointer)
(values (or number string symbol selector id
objc-class boolean foreign-pointer)
&rest nil))
obj-data->lisp))
(defun obj-data->lisp (obj-data)
(with-foreign-slots ((type data) obj-data obj-data)
(let* ((type-name (type-id->type-name (foreign-string-to-lisp type)))
(lisp-type (type-name->lisp-type type-name))
(value (if (eq 'void type-name)
(values)
(foreign-slot-value data
'obj-data-union
(type-name->slot-name type-name)))))
(case lisp-type
((id objc-class selector exception)
(make-instance lisp-type :pointer value))
((string) (foreign-string-to-lisp value))
(otherwise value)))))
(defmacro with-foreign-conversion (bindings &body body)
`(with-foreign-objects
,(mapcar #'(lambda (name-value-pair)
(destructuring-bind (name value)
name-value-pair
`(,name (lisp->obj-data ,value))))
bindings)
,@body))
(defmacro with-foreign-objects (bindings &body body)
`(let ,(mapcar #'(lambda (name-value-pair)
(destructuring-bind (name value)
name-value-pair
`(,name ,value)))
bindings)
(unwind-protect
(progn ,@body)
,@(mapcar #'(lambda (name-value-pair)
`(dealloc-obj-data ,(first name-value-pair)))
bindings))))
(declaim (ftype (function (foreign-pointer) (values string &rest nil))
foreign-string-to-lisp/dealloc))
(defun foreign-string-to-lisp/dealloc (foreign-string)
"Convert a (possibly freshly allocated) C string into a Lisp string
and free the C string afterwards."
(unwind-protect
(foreign-string-to-lisp foreign-string)
(foreign-string-free foreign-string)))
;;; (@* "High-level Data Conversion")
(eval-when (:compile-toplevel :load-toplevel)
;; In order to be able to dispatch over pointer types, we need to
;; define an alias of the implementation's own pointer class. Note
;; that this may be T (in GNU CLISP, for example), so it's a good idea
;; to use CHECK-TYPE in the method body.
(unless (find-class 'foreign-pointer nil)
(setf (find-class 'foreign-pointer nil)
(class-of (make-pointer 0))))
(deftype foreign-pointer ()
'(satisfies cffi:pointerp)))
(defun objc-typep (x class-designator)
(objc-eql (invoke x 'class)
(etypecase x
(class x)
(id (invoke x 'class))
((or string symbol) (find-objc-class class-designator t)))))
(defgeneric ->id (x))
(defgeneric ->class (x))
(defgeneric ->integer (x))
(defgeneric ->selector (x))
(defgeneric ->exception (x))
(defgeneric ->character (x))
(defgeneric ->float (x))
(defgeneric ->double (x))
(defgeneric ->bool (x))
(defgeneric ->string (x))
(defgeneric ->pointer (x))
(defmethod ->id ((x id))
x)
(defmethod ->id ((x class))
(invoke x 'self))
(defmethod ->id ((x exception))
(invoke x 'self))
(defmethod ->id ((x integer))
(let ((id (invoke (find-class 'ns-number)
:number-with-long x)))
(invoke id 'retain)
(invoke id 'autorelease)
id))
(defmethod ->id ((x float))
(let ((id (invoke (find-class 'ns-number)
:number-with-double x)))
(invoke id 'retain)
(invoke id 'autorelease)
id))
(defmethod ->id ((x string))
(let ((id (invoke (find-class 'ns-string)
:string-with-c-string x)))
(invoke id 'retain)
(invoke id 'autorelease)
id))
(defmethod ->class ((x id))
(invoke x 'class))
(defmethod ->class ((x exception))
(invoke x 'class))
(defmethod ->class ((x class))
x)
(defmethod ->class ((x string))
(find-objc-class x t))
(defmethod ->class ((x symbol))
(find-objc-class x t))
(defmethod ->integer ((x id))
(assert (objc-typep x 'ns-number))
(invoke x 'long-value))
(defmethod ->integer ((x number))
(truncate x))
(defmethod ->integer ((x null))
0)
(defmethod ->integer ((x symbol))
(assert (eq 't x))
1)
(defmethod ->selector ((x selector))
x)
(defmethod ->selector ((x symbol))
(selector x))
(defmethod ->selector ((x string))
(selector x))
(defmethod ->selector ((x cons))
(selector x))
(defmethod ->exception ((x exception))
x)
(defmethod ->character ((x character))
x)
(defmethod ->character ((x integer))
x)
(defmethod ->float ((x number))
(float x))
(defmethod ->double ((x number))
(float x))
(defmethod ->bool ((x null))
x)
(defmethod ->bool ((x symbol))
(assert (eq 't x))
x)
(defmethod ->bool ((x integer))
x)
(defmethod ->string ((x string))
x)
(defmethod ->string ((x foreign-pointer))
(check-type x foreign-pointer)
x)
(defmethod ->pointer ((x foreign-pointer))
(check-type x foreign-pointer)
x)
(defmethod ->pointer ((x exception))
(pointer-to x))
(defmethod ->pointer ((x c-pointer-wrapper))
(pointer-to x))
(defmethod ->pointer ((x number))
(pointer-to (->id x)))
|
