1 | ;;; deftype.lisp |
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2 | ;;; |
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3 | ;;; Copyright (C) 2004-2005 Peter Graves |
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4 | ;;; $Id: deftype.lisp,v 1.4 2005-02-26 17:36:19 piso Exp $ |
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5 | ;;; |
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6 | ;;; This program is free software; you can redistribute it and/or |
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7 | ;;; modify it under the terms of the GNU General Public License |
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8 | ;;; as published by the Free Software Foundation; either version 2 |
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9 | ;;; of the License, or (at your option) any later version. |
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10 | ;;; |
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11 | ;;; This program is distributed in the hope that it will be useful, |
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12 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | ;;; GNU General Public License for more details. |
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15 | ;;; |
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16 | ;;; You should have received a copy of the GNU General Public License |
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17 | ;;; along with this program; if not, write to the Free Software |
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18 | ;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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19 | |
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20 | (in-package #:system) |
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21 | |
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22 | (defmacro deftype (name lambda-list &rest body) |
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23 | ;; Optional parameters default to * rather than NIL. |
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24 | ;; FIXME Extend this code to handle keyword parameters too! |
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25 | (when (memq '&optional lambda-list) |
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26 | (let ((new-lambda-list ()) |
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27 | (optionalp nil)) |
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28 | (dolist (thing lambda-list) |
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29 | (cond (optionalp |
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30 | (when (symbolp thing) |
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31 | (setf thing (list thing ''*)))) |
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32 | ((eq thing '&optional) |
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33 | (setf optionalp t)) |
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34 | ((memq thing lambda-list-keywords) |
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35 | (setf optionalp nil))) |
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36 | (push thing new-lambda-list)) |
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37 | (setf lambda-list (nreverse new-lambda-list)))) |
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38 | `(progn |
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39 | (setf (get ',name 'deftype-definition) #'(lambda ,lambda-list ,@body)) |
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40 | ',name)) |
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41 | |
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42 | (defun expand-deftype (type) |
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43 | (let (tp i) |
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44 | (loop |
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45 | (if (consp type) |
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46 | (setf tp (car type) i (cdr type)) |
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47 | (setf tp type i nil)) |
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48 | (if (and (symbolp tp) (get tp 'deftype-definition)) |
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49 | (setf type (apply (get tp 'deftype-definition) i)) |
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50 | (return)))) |
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51 | type) |
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