1 ;;;; and-let-star.scm --- and-let* syntactic form (draft SRFI-2) for Guile
2 ;;;; written by Michael Livshin <mike@olan.com>
4 ;;;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
6 ;;;; This library is free software; you can redistribute it and/or
7 ;;;; modify it under the terms of the GNU Lesser General Public
8 ;;;; License as published by the Free Software Foundation; either
9 ;;;; version 2.1 of the License, or (at your option) any later version.
11 ;;;; This library is distributed in the hope that it will be useful,
12 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ;;;; Lesser General Public License for more details.
16 ;;;; You should have received a copy of the GNU Lesser General Public
17 ;;;; License along with this library; if not, write to the Free Software
18 ;;;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 (define-module (ice-9 and-let-star)
21 :export-syntax (and-let*))
23 (defmacro and-let* (vars . body)
25 (define (expand vars body)
30 (let ((exp (car vars)))
35 `(and ,(car exp) ,(expand (cdr vars) body)))
40 (and ,var ,(expand (cdr vars) body)))))))
42 `(and ,exp ,(expand (cdr vars) body))))))
44 (error "not a proper list" vars))))