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 Free Software Foundation, Inc.
6 ;;;; This program is free software; you can redistribute it and/or modify
7 ;;;; it under the terms of the GNU General Public License as published by
8 ;;;; the Free Software Foundation; either version 2, or (at your option)
9 ;;;; any later version.
11 ;;;; This program 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
14 ;;;; GNU General Public License for more details.
16 ;;;; You should have received a copy of the GNU General Public License
17 ;;;; along with this software; see the file COPYING. If not, write to
18 ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
19 ;;;; Boston, MA 02111-1307 USA
21 (define-module (ice-9 and-let-star))
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))))
48 (export-syntax and-let*)