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;;;; and-let-star.scm --- and-let* syntactic form (draft SRFI-2) for Guile
;;;; written by Michael Livshin <mike@olan.com>
;;;;
;;;; Copyright (C) 1999, 2001, 2004, 2006 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
(define-module (ice-9 and-let-star)
:export-syntax (and-let*))
(defmacro and-let* (vars . body)
(define (expand vars body)
(cond
((null? vars)
(if (null? body)
#t
`(begin ,@body)))
((pair? vars)
(let ((exp (car vars)))
(cond
((pair? exp)
(cond
((null? (cdr exp))
`(and ,(car exp) ,(expand (cdr vars) body)))
(else
(let ((var (car exp)))
`(let (,exp)
(and ,var ,(expand (cdr vars) body)))))))
(else
`(and ,exp ,(expand (cdr vars) body))))))
(else
(error "not a proper list" vars))))
(expand vars body))
(cond-expand-provide (current-module) '(srfi-2))