1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
|
;; 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"))
;; We introduce the file-measure function and show that it is reduced by the
;; read-byte$, read-char$, and read-object functions. This is useful for
;; introducing recursive functions based on reading a file.
(defun file-measure (channel state-state)
(declare (xargs :guard (and (symbolp channel)
(state-p1 state-state))))
(len (cddr (assoc-equal channel (open-input-channels state-state)))))
(local (defthm assoc-eq-is-assoc-equal
(equal (assoc-eq a x)
(assoc-equal a x))))
(defthm read-byte$-measure-weak
(implies (state-p1 state)
(<= (file-measure channel (mv-nth 1 (read-byte$ channel state)))
(file-measure channel state)))
:hints(("Goal" :in-theory (disable statep-functions)))
:rule-classes ((:rewrite) (:linear)))
(defthm read-byte$-measure-strong
(implies (and (state-p1 state)
(car (read-byte$ channel state)))
(< (file-measure channel (mv-nth 1 (read-byte$ channel state)))
(file-measure channel state)))
:hints(("Goal" :in-theory (disable statep-functions)))
:rule-classes ((:rewrite) (:linear)))
(defthm read-char$-measure-weak
(implies (state-p1 state)
(<= (file-measure channel (mv-nth 1 (read-char$ channel state)))
(file-measure channel state)))
:hints(("Goal" :in-theory (disable statep-functions)))
:rule-classes ((:rewrite) (:linear)))
(defthm read-char$-measure-strong
(implies (and (state-p1 state)
(car (read-char$ channel state)))
(< (file-measure channel (mv-nth 1 (read-char$ channel state)))
(file-measure channel state)))
:hints(("Goal" :in-theory (disable statep-functions)))
:rule-classes ((:rewrite) (:linear)))
(defthm read-object-measure-weak
(implies (state-p1 state)
(<= (file-measure channel (mv-nth 2 (read-object channel state)))
(file-measure channel state)))
:hints(("Goal" :in-theory (disable statep-functions)))
:rule-classes ((:rewrite) (:linear)))
(defthm read-object-measure-strong
(implies (and (state-p1 state)
(car (read-object channel state)))
(<= (file-measure channel (mv-nth 2 (read-object channel state)))
(file-measure channel state)))
:hints(("Goal" :in-theory (disable statep-functions)))
:rule-classes ((:rewrite) (:linear)))
(in-theory (disable file-measure))
|