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1a179b03b0
`export-syntax', `re-export' and `re-export-syntax' into the `define-module' form. This is the recommended way of exporting bindings. * srfi-2.scm, srfi-4.scm, srfi-8.scm, srfi-9.scm, srfi-10.scm, srfi-11.scm, srfi-14.scm, srfi-16.scm: Move module the system directives `export', `export-syntax', `re-export' and `re-export-syntax' into the `define-module' form. This is the recommended way of exporting bindings. * goops.scm, goops/active-slot.scm, goops/compile.scm, goops/composite-slot.scm, goops/describe.scm, goops/dispatch.scm, goops/old-define-method.scm, goops/save.scm, goops/util.scm: Move module the system directives `export', `export-syntax', `re-export' and `re-export-syntax' into the `define-module' form. This is the recommended way of exporting bindings. * slib.scm (array-indexes): New procedure. (*features*): Extend. (Probably some of these options should be set elsewhere.) (Thanks to Aubrey Jaffer.) * and-let-star-compat.scm, and-let-star.scm, calling.scm, channel.scm, common-list.scm, debug.scm, debugger.scm, expect.scm, hcons.scm, lineio.scm, ls.scm, mapping.scm, null.scm, optargs.scm, poe.scm, popen.scm, pretty-print.scm, q.scm, r5rs.scm, rdelim.scm, regex.scm, runq.scm, safe-r5rs.scm, safe.scm, session.scm, slib.scm, streams.scm, string-fun.scm, syncase.scm, threads.scm: Move module the system directives `export', `export-syntax', `re-export' and `re-export-syntax' into the `define-module' form. This is the recommended way of exporting bindings.
71 lines
2.9 KiB
Scheme
71 lines
2.9 KiB
Scheme
;;;; and-let-star.scm --- and-let* syntactic form (draft SRFI-2) for Guile
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;;;; written by Michael Livshin <mike@olan.com>
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;;;;
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;;;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
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;;;;
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;;;; This program is free software; you can redistribute it and/or modify
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;;;; it under the terms of the GNU General Public License as published by
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;;;; the Free Software Foundation; either version 2, or (at your option)
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;;;; any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this software; see the file COPYING. If not, write to
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;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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;;;; Boston, MA 02111-1307 USA
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;;;;
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;;;; As a special exception, the Free Software Foundation gives permission
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;;;; for additional uses of the text contained in its release of GUILE.
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;;;;
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;;;; The exception is that, if you link the GUILE library with other files
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;;;; to produce an executable, this does not by itself cause the
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;;;; resulting executable to be covered by the GNU General Public License.
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;;;; Your use of that executable is in no way restricted on account of
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;;;; linking the GUILE library code into it.
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;;;;
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;;;; This exception does not however invalidate any other reasons why
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;;;; the executable file might be covered by the GNU General Public License.
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;;;;
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;;;; This exception applies only to the code released by the
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;;;; Free Software Foundation under the name GUILE. If you copy
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;;;; code from other Free Software Foundation releases into a copy of
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;;;; GUILE, as the General Public License permits, the exception does
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;;;; not apply to the code that you add in this way. To avoid misleading
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;;;; anyone as to the status of such modified files, you must delete
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;;;; this exception notice from them.
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;;;;
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;;;; If you write modifications of your own for GUILE, it is your choice
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;;;; whether to permit this exception to apply to your modifications.
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;;;; If you do not wish that, delete this exception notice.
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(define-module (ice-9 and-let-star)
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:export-syntax (and-let*))
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(defmacro and-let* (vars . body)
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(define (expand vars body)
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(cond
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((null? vars)
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`(begin ,@body))
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((pair? vars)
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(let ((exp (car vars)))
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(cond
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((pair? exp)
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(cond
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((null? (cdr exp))
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`(and ,(car exp) ,(expand (cdr vars) body)))
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(else
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(let ((var (car exp))
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(val (cadr exp)))
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`(let (,exp)
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(and ,var ,(expand (cdr vars) body)))))))
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(else
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`(and ,exp ,(expand (cdr vars) body))))))
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(else
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(error "not a proper list" vars))))
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(expand vars body))
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