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;; Processing Unicode Files with ACL2
;; Copyright (C) 2005-2006 by Jared Davis <jared@cs.utexas.edu>
;;
;; This program is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by the Free
;; Software Foundation; either version 2 of the License, or (at your option)
;; any later version.
;;
;; This program 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 General Public License for
;; more details.
;;
;; You should have received a copy of the GNU General Public License along with
;; this program; if not, write to the Free Software Foundation, Inc., 59 Temple
;; Place - Suite 330, Boston, MA 02111-1307, USA.
(in-package "ACL2")
(local (include-book "update-state"))
(local (include-book "open-input-channels"))
(local (defthm assoc-eq-is-assoc-equal
(equal (assoc-eq a x)
(assoc-equal a x))))
(local (defthmd car-typed-io-list-char
(implies (and (typed-io-listp x :character)
(consp x))
(characterp (car x)))))
(defthm peek-char$-character
(implies (and (force (state-p1 state))
(force (open-input-channel-p1 channel :character state))
(car (peek-char$ channel state)))
(characterp (car (peek-char$ channel state))))
:hints(("Goal" :in-theory (disable open-input-channel-p1
open-input-channels)
:use (:instance car-typed-io-list-char
(x (cddr (assoc-equal
channel
(open-input-channels state))))))))
(in-theory (disable state-p1 open-input-channel-p1 peek-char$))
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