1 files changed, 97 insertions, 0 deletions
diff --git a/Lisp/data-types.lisp b/Lisp/data-types.lisp
new file mode 100644
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+++ b/Lisp/data-types.lisp
@@ -0,0 +1,97 @@
+(in-package #:mulk.objective-cl)
+
+
+;;;; (@* "Foreign data types")
+(defctype char-pointer :pointer)
+
+(defcunion obj-data-union
+  (id-val :pointer)
+  (class-val :pointer)
+  (exc-val :pointer)
+  (sel-val :pointer)
+  (char-val :char)
+  (short-val :short)
+  (int-val :int)
+  (long-val :long)
+  (long-long-val :long-long)
+  (float-val :float)
+  (double-val :double)
+  (bool-val :boolean)
+  (charptr-val :pointer)
+  (ptr-val :pointer))
+
+(defcstruct obj-data
+  (type char-pointer)
+  (data obj-data-union))
+
+(defmethod translate-to-foreign ((value string) (type (eql 'char-pointer)))
+  (foreign-string-alloc value))
+
+(defmethod translate-from-foreign (c-value (type (eql 'char-pointer)))
+  (foreign-string-to-lisp c-value))
+
+
+;;;; (@* "Objective C object wrapper classes")
+(defclass c-pointer-wrapper ()
+  ((pointer :type     c-pointer
+            :reader   pointer-to
+            :initarg  :pointer
+            :initform nil)))
+
+
+(defclass objc-selector (c-pointer-wrapper) ())
+(defclass objc-id       (c-pointer-wrapper) ())
+(defclass objc-class    (c-pointer-wrapper) ())
+
+
+(define-condition objc-exception (error)
+  ((pointer :type     c-pointer
+            :accessor pointer-to
+            :initarg  :pointer))
+  (:documentation "The condition type for Objective C exceptions.")
+  (:report (lambda (condition stream)
+             (format stream
+                     "The Objective C runtime has issued an exception of ~
+                      type `~A'.~&~
+                      Reason: ~A."
+                     (objcl-invoke-class-method
+                      (objcl-invoke-class-method condition "name")
+                      "UTF8String")
+                     (objcl-invoke-class-method
+                      (objcl-invoke-class-method condition "reason")
+                      "UTF8String")))))
+
+
+(defgeneric objcl-eql (obj1 obj2))
+(defmethod objcl-eql ((obj1 c-pointer-wrapper) (obj2 c-pointer-wrapper))
+  (pointer-eq (pointer-to obj1) (pointer-to obj2)))
+(defmethod objcl-eql (obj1 obj2)
+  (eql obj1 obj2))
+
+
+(defun dealloc-obj-data (obj-data)
+  (with-foreign-slots ((type data) obj-data obj-data)
+    (foreign-string-free type))
+  (foreign-free obj-data))
+
+
+(defmethod print-object ((object objc-id) stream)
+  (print-unreadable-object (object stream)
+    (format stream "~A `~A' {~X}"
+            (objcl-class-name
+             (objcl-invoke-class-method object "class"))
+            (objcl-invoke-class-method
+             (objcl-invoke-class-method object "description")
+             "UTF8String")
+            (objcl-invoke-class-method object "hash"))))
+
+
+(defmethod print-object ((object objc-class) stream)
+  (print-unreadable-object (object stream)
+    (format stream "OBJC-CLASS ~A"
+            (objcl-class-name object))))
+
+
+;;;; (@* "Convenience types")
+(deftype c-pointer ()
+  '(satisfies pointerp))