X-Git-Url: https://git.distorted.org.uk/~mdw/lisp/blobdiff_plain/b86088125dc0d9961a9089a99c37a39e033da718..1a50efd8a9e976bf16a29ce381ea38c6b9a39ea1:/anaphora.lisp diff --git a/anaphora.lisp b/anaphora.lisp index c7a4b08..9e7d820 100644 --- a/anaphora.lisp +++ b/anaphora.lisp @@ -13,27 +13,28 @@ ;;; 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. -(defpackage #:mdw.anaphora +(defpackage #:anaphora (:use #:common-lisp) (:export #:it #:aif #:aif2 #:awhen #:awhen2 #:aand #:awhile #:asetf #:acond)) -(in-package #:mdw.anaphora) +(in-package #:anaphora) (defmacro aif (cond then &optional else) "Bind `it' to result of COND when evaluating THEN or ELSE." `(let ((it ,cond)) (if it ,then ,@(and else (list else))))) + (defmacro aif2 (cond then &optional else) "Bind `it' to first value of COND; switch on second." (let ((tmp (gensym))) @@ -45,6 +46,7 @@ "Bind `it' to result of COND when evaluating BODY." `(let ((it ,cond)) (when it ,@body))) + (defmacro awhen2 (cond &body body) "Bind `it' to first value of COND; switch on second." (let ((tmp (gensym))) @@ -72,7 +74,7 @@ (defmacro asetf (&rest pairs &environment env) "Set PLACE to value of FORM; in FORM, `it' is bound to current value of -PLACE." + PLACE." (labels ((foo (pairs) (when pairs (let ((place (car pairs)) @@ -87,10 +89,10 @@ PLACE." ,setform))) (foo rest)))))) (cons 'progn (foo pairs)))) - + (defmacro acond (&rest clauses) "Like `cond', but in each clause the consequent has `it' bound to the value -of its guard." + of its guard." (labels ((foo (clauses) (when clauses (let ((tmp (gensym))