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;;;; Objective-CL, an Objective-C bridge for Common Lisp.
;;;; Copyright (C) 2007 Matthias Andreas Benkard.
;;;;
;;;; This program is free software: you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public License
;;;; as published by the Free Software Foundation, either version 3 of
;;;; the License, or (at your option) any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful, but
;;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this program. If not, see
;;;; <http://www.gnu.org/licenses/>.
(in-package #:mulk.objective-cl)
;;;; (@* "Convenience types")
(deftype c-pointer ()
'(satisfies pointerp))
(deftype argument-number ()
`(integer 0 ,call-arguments-limit))
;;;; (@* "Foreign data types")
(defctype char-pointer :pointer)
;;;; (@* "Objective-C object wrapper classes")
(defclass c-pointer-wrapper ()
((pointer :type c-pointer
:reader pointer-to
:initarg :pointer
:initform (cffi:null-pointer))))
(defclass selector (c-pointer-wrapper) ()
(:documentation "An Objective-C method selector.
## Description:
Method selectors are Objective-C's equivalent to what Common Lisp calls
**symbols**. Their use is restricted to retrieving methods by name.
__selector__ objects cannot be created by means of __make-instance__.
Use __find-selector__ instead.
## See also:
__find-selector__"))
(defclass id (c-pointer-wrapper) ()
(:documentation "An instance of an Objective-C class.
## Description:
The class __id__ serves as a general-purpose container for all kinds of
Objective-C objects that are instances of some Objective-C class, that
is, neither primitive C values nor __selector__, __class__ or
__exception__ objects.
__id__ objects cannot be created by means of __make-instance__. Use
a suitable class method instead as you would in Objective-C.
## Examples:
(invoke (find-objc-class 'ns-object)
'self)
;=> #<NSObject `NSObject' {16ECF598}>
(invoke (find-objc-class 'ns-string)
:string-with-c-string \"Mulk.\")
;=> #<GSCBufferString `Mulk.' {5B36087}>
(invoke (find-objc-class 'ns-string)
'new)
;=> #<GSCBufferString `' {FFFFFFE}>
## See also:
__invoke__, __invoke-by-name__, __exception__"))
(defclass objective-c-class (standard-class c-pointer-wrapper)
())
(defclass objective-c-meta-class (objective-c-class)
())
(define-condition exception (error)
((pointer :type c-pointer
:accessor pointer-to
:initarg :pointer))
(:report (lambda (condition stream)
(format stream
"The Objective-C runtime has issued an exception of ~
type `~A'.~&~
Reason: ~A."
(invoke-by-name
(invoke-by-name condition "name")
"UTF8String")
(invoke-by-name
(invoke-by-name condition "reason")
"UTF8String"))))
(:documentation "The condition type for Objective-C exceptions.
## Description:
Whenever an Objective-C call made by means of __invoke__ or
__invoke-by-name__ raises an exception, the exception is propagated to
the Lisp side by being encapsulated in an __exception__ object and
signaled.
Note that it is currently impossible to directly extract the original
Objective-C exception from an __exception__ object, although it might
arguably be desirable to do so. As __exception__ objects behave just
like __id__ objects in almost all circumstances, this is not much of a
problem, though. If you really do need an __id__ instance rather than
an __exception__, you can simply send it the `self' message.
## Examples:
\(With __install-reader-syntax__ enabled.)
(handler-case
[NSArray selph] ; oops, typo
(exception (e)
e))
;=> #<MULK.OBJECTIVE-CL:EXCEPTION NSInvalidArgumentException {1048D63}>
(class-of *)
;=> #<CONDITION-CLASS EXCEPTION>
(class-of [** self])
;=> #<STANDARD-CLASS ID>
## See also:
__id__"))
(defclass opaque-struct (c-pointer-wrapper)
((name :type (or null string)
:accessor struct-name
:initarg :name)))
(defclass tagged-struct (c-pointer-wrapper)
((name :type (or null string)
:accessor struct-name
:initarg :name)
(children :type list
:accessor struct-children
:initarg :children)))
(defclass opaque-union (c-pointer-wrapper)
((name :type (or null string)
:accessor struct-name
:initarg :name)))
(defclass tagged-union (c-pointer-wrapper)
((name :type (or null string)
:accessor struct-name
:initarg :name)
(children :type list
:accessor struct-children
:initarg :children)))
(defclass tagged-array (c-pointer-wrapper)
((element-type :type symbol
:accessor tagged-array-element-type
:initarg :element-type)))
(defgeneric type-info (thing))
(defmethod type-info ((thing opaque-struct))
(with-slots (name)
thing
(list* 'struct '(opaque) name)))
(defmethod type-info ((thing tagged-struct))
(with-slots (name children)
thing
(list* 'struct '() name (mapcar #'type-info children))))
(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))
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