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Common Lisp implementation running on the JVM
;;; source-transform.lisp
;;;
;;; Copyright (C) 2004-2005 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module. An independent module is a module which is not derived from
;;; or based on this library. If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so. If you do not wish to do so, delete this
;;; exception statement from your version.
(in-package #:system)
(export '(source-transform define-source-transform expand-source-transform))
(defun source-transform (name)
(get-function-info-value name :source-transform))
(defun set-source-transform (name transform)
(set-function-info-value name :source-transform transform))
(defsetf source-transform set-source-transform)
(defmacro define-source-transform (name lambda-list &rest body)
(let* ((form (gensym))
(env (gensym))
(block-name (if (symbolp name) name (cadr name)))
(body (parse-defmacro lambda-list form body name 'defmacro
:environment env
;; when we encounter an error
;; parsing the arguments in the call
;; (not in the difinition!), return
;; the arguments unmodified -- ie skip the
;; transform (see also compiler-macro.lisp)
:error-fun `(lambda (&rest ignored)
(declare (ignore ignored))
(return-from ,block-name ,form))))
(expander
`(lambda (,form) (block ,block-name ,body))))
`(eval-when (:compile-toplevel :load-toplevel :execute)
(setf (source-transform ',name) ,expander)
',name)))
(defun expand-source-transform-1 (form)
(let ((expander nil)
(newdef nil))
(cond ((atom form)
(values form nil))
((and (consp (%car form))
(eq (caar form) 'SETF)
(setf expander (source-transform (%car form))))
(values (setf newdef (funcall expander form))
(not (eq newdef form))))
((and (symbolp (%car form))
(setf expander (source-transform (%car form))))
(values (setf newdef (funcall expander form))
(not (eq newdef form))))
(t
(values form nil)))))
(defun expand-source-transform (form)
(let ((expanded-p nil))
(loop
(multiple-value-bind (expansion exp-p) (expand-source-transform-1 form)
(if exp-p
(setf form expansion
expanded-p t)
(return))))
(values form expanded-p)))