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;;;; Objective-CL, an Objective-C bridge for Common Lisp.
;;;; Copyright (C) 2007, 2008 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)
#.(enable-method-syntax)
(eval-when (:compile-toplevel :load-toplevel :execute)
(find-objc-class "NSObject" t)
(find-objc-class "NSString" t)
(find-objc-class "NSArray" t)
(find-objc-class "NSDictionary" t))
(defclass lisp-value-wrapper-mixin ()
((lisp-value :initarg :value
:initform nil
:accessor lisp-value)))
;; May usefully override, among others:
;; - description
(defclass ns::mlk-lisp-value (ns::ns-object lisp-value-wrapper-mixin)
()
#+(or) (:default-constructor new)
(:metaclass ns::+ns-object))
(defvar *lisp-value-wrappers* (make-weak-value-hash-table))
(defun intern-lisp-value (value)
;; We need this function in order to preserve object identity on the
;; Objective-C side. As we want [(intern-lisp-value 10) self] to
;; return the FIXNUM 10, that is, a Lisp value rather than an
;; Objective-C instance, we cannot guarantee that
;;
;; (let ((x (intern-lisp-value y)))
;; (objc-eql x (invoke x 'self)))
;;
;; will evaluate to true unless we generally intern Lisp value
;; wrappers.
(or (weak-gethash value *lisp-value-wrappers* nil)
(setf (weak-gethash value *lisp-value-wrappers*)
(make-lisp-value value))))
(defun make-lisp-value (value)
;; FIXME: The following won't work. Make MAKE-INSTANCE more useful...
;(make-instance 'ns::mlk-lisp-value :value value)
(let ((instance (invoke (typecase value
(string (find-class 'ns::mlk-lisp-string))
(vector (find-class 'ns::mlk-lisp-array))
(list (find-class 'ns::mlk-lisp-list))
(t (find-class 'ns::mlk-lisp-value)))
'new)))
(setf (lisp-value instance) value)
instance))
;; Must override:
;; - characterAtIndex:
;; - length
;;
;; May usefully override, among others:
;; - substringWithRange: (maybe)
;; - getCharacters:range: (for performance reasons)
;; - description
(defclass ns::mlk-lisp-string (ns::ns-string lisp-value-wrapper-mixin)
()
(:metaclass ns::+ns-object))
;; Must override:
;; - objectAtIndex:
;; - count
;;
;; May usefully override, among others:
;; - description
(defclass ns::mlk-lisp-array (ns::ns-array lisp-value-wrapper-mixin)
()
(:metaclass ns::+ns-object))
;; Must override:
;; - objectAtIndex:
;; - count
;;
;; May usefully override, among others:
;; - description
(defclass ns::mlk-lisp-list (ns::mlk-lisp-array)
()
(:metaclass ns::+ns-object))
(define-objective-c-method #/description :id ((self ns::mlk-lisp-value))
(#/stringWithUTF8String: (find-objc-class 'ns-string)
(format nil "<MLKLispValue: ~A>"
(write-to-string (lisp-value self)
:readably nil
:escape t
:circle t
:length 50
:level 5
:pretty nil
:radix nil
:base 10))))
(define-objective-c-method #/characterAtIndex: :short ((self ns::mlk-lisp-string)
(index :unsigned-long))
;; index is actually NSUInteger ==
;; (:unsigned-long ((:nominally :unsigned-int))) on 32-bit architectures,
;; but (:unsigned-long ()) on 64-bit architectures.
;;
;; That is, it's word-sized and labeled `unsigned int' on 32-bit.
(char-int (char (lisp-value self) index)))
(define-objective-c-method #/length :unsigned-long ((self ns::mlk-lisp-string))
(length (lisp-value self)))
(define-objective-c-method #/objectAtIndex: ((self ns::mlk-lisp-array)
(index :unsigned-long))
(aref (lisp-value self) index))
(define-objective-c-method #/count ((self ns::mlk-lisp-array))
(length (lisp-value self)))
#.(disable-method-syntax)
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