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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")
(set-state-ok t)
(include-book "file-measure")
(local (include-book "open-input-channel"))
(local (include-book "read-char"))
(local (include-book "close-input-channel"))
(defun tr-read-char$-all (channel state acc)
(declare (xargs :guard (and (state-p state)
(symbolp channel)
(open-input-channel-p channel :character state)
(true-listp acc))
:measure (file-measure channel state)))
(if (mbt (state-p state))
(mv-let (char state)
(read-char$ channel state)
(if (eq char nil)
(mv (reverse acc) state)
(tr-read-char$-all channel state (cons char acc))))
(mv nil state)))
(defun read-char$-all (channel state)
(declare (xargs :guard (and (state-p state)
(symbolp channel)
(open-input-channel-p channel :character state))
:measure (file-measure channel state)
:verify-guards nil))
(mbe :logic (if (state-p state)
(mv-let (char state)
(read-char$ channel state)
(if (null char)
(mv nil state)
(mv-let (rest state)
(read-char$-all channel state)
(mv (cons char rest) state))))
(mv nil state))
:exec (tr-read-char$-all channel state nil)))
(defun read-file-characters (filename state)
(declare (xargs :guard (and (state-p state)
(stringp filename))
:verify-guards nil))
(mv-let (channel state)
(open-input-channel filename :character state)
(if channel
(mv-let (data state)
(read-char$-all channel state)
(let ((state (close-input-channel channel state)))
(mv data state)))
(mv "Error opening file." state))))
(local (defthm lemma-decompose-impl
(equal (tr-read-char$-all channel state acc)
(list (car (tr-read-char$-all channel state acc))
(mv-nth 1 (tr-read-char$-all channel state acc))))
:rule-classes nil))
(local (defthm lemma-decompose-spec
(equal (read-char$-all channel state)
(list (car (read-char$-all channel state))
(mv-nth 1 (read-char$-all channel state))))
:rule-classes nil))
(local (defthm lemma-data-equiv
(implies (and (state-p1 state)
(symbolp channel)
(open-input-channel-p1 channel :character state)
(true-listp acc))
(equal (car (tr-read-char$-all channel state acc))
(revappend acc (car (read-char$-all channel state)))))))
(local (defthm lemma-state-equiv
(equal (mv-nth 1 (tr-read-char$-all channel state acc))
(mv-nth 1 (read-char$-all channel state)))))
(local (defthm lemma-equiv
(implies (and (state-p1 state)
(symbolp channel)
(open-input-channel-p1 channel :character state))
(equal (tr-read-char$-all channel state nil)
(read-char$-all channel state)))
:hints(("Goal" :in-theory (disable tr-read-char$-all read-char$-all)
:use ((:instance lemma-decompose-impl (acc nil))
(:instance lemma-decompose-spec)
(:instance lemma-data-equiv (acc nil)))))))
(verify-guards read-char$-all)
(defthm read-char$-all-preserves-state
(implies (and (force (state-p1 state))
(force (symbolp channel))
(force (open-input-channel-p1 channel :character state)))
(state-p1 (mv-nth 1 (read-char$-all channel state)))))
(defthm read-char$-all-preserves-open-input-channel-p1
(implies (and (force (state-p1 state))
(force (symbolp channel))
(force (open-input-channel-p1 channel :character state)))
(open-input-channel-p1 channel :character
(mv-nth 1 (read-char$-all channel state)))))
(defthm read-char$-all-character-listp
(implies (and (force (state-p1 state))
(force (symbolp channel))
(force (open-input-channel-p1 channel :character state)))
(character-listp (car (read-char$-all channel state)))))
(verify-guards read-file-characters)
(defthm read-file-characters-preserves-state
(implies (and (force (state-p1 state))
(force (stringp filename)))
(state-p1 (mv-nth 1 (read-file-characters filename state)))))
(defthm read-file-characters-error-or-character-list
(implies (and (force (state-p1 state))
(force (stringp filename))
(not (stringp (car (read-file-characters filename state)))))
(character-listp (car (read-file-characters filename state)))))
(in-theory (disable tr-read-char$-all read-char$-all read-file-characters))
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