/usr/share/acl2-4.3/books/unicode/file-measure.lisp is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | ;; 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 "tools/mv-nth" :dir :system))
(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)))))
; [Removed by Matt K. to handle changes to member, assoc, etc. after ACL2 4.2.]
; (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$-measure-strong
(implies (and (state-p1 state)
(mv-nth 0 (read-byte$ 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$-measure-strong
(implies (and (state-p1 state)
(mv-nth 0 (read-char$ 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)))
(encapsulate
()
(local (defthm lemma
(implies (state-p1 state)
(equal (consp (cddr (assoc-equal channel (open-input-channels state))))
(if (cddr (assoc-equal channel (open-input-channels state)))
t
nil)))
:hints(("Goal"
:in-theory (disable open-channels-assoc
open-channels-p
open-input-channels)
:use ((:instance open-channels-assoc
(x (open-input-channels state))))))))
(defthm read-object-measure-strong
(implies (and (state-p1 state)
(not (mv-nth 0 (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))
|