More file and directory layout refactoring.

darcs-hash:9efff3ff2e22c9d8a85f8fcc7fa4487937ddd62f

1 files changed, 35 insertions, 0 deletions

diff --git a/Lisp/type-conversion.lisp b/Lisp/type-conversion.lisp
new file mode 100644
index 0000000..6869ff9
--- /dev/null
+++ b/Lisp/type-conversion.lisp
@@ -0,0 +1,35 @@
+(in-package #:mulk.objective-cl)
+
+
+;;; (@* "Data conversion")
+(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
+              ((or objc-id objc-class objc-selector objc-exception)
+               (pointer-to value))
+              (string    (foreign-string-alloc value))
+              (otherwise value)))
+      (setf type
+            (foreign-string-alloc (type-name->type-id type-name))))
+    obj-data))
+
+
+(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
+        ((objc-id objc-class objc-selector objc-exception)
+         (make-instance lisp-type :pointer value))
+        ((string)  (foreign-string-to-lisp value))
+        (otherwise value)))))
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