| Server IP : 79.136.114.73 / Your IP : 216.73.216.36 Web Server : Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.29 OpenSSL/1.0.1f System : Linux b8009 3.13.0-170-generic #220-Ubuntu SMP Thu May 9 12:40:49 UTC 2019 x86_64 User : www-data ( 33) PHP Version : 5.5.9-1ubuntu4.29 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority, MySQL : ON | cURL : ON | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : ON Directory : /usr/share/guile/2.0/ice-9/ |
Upload File : |
;;;; 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))