/usr/share/acl2-6.3/books/str/subseq.lisp is in acl2-books-source 6.3-5.
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 | ; ACL2 String Library
; Copyright (C) 2009-2013 Centaur Technology
;
; Contact:
; Centaur Technology Formal Verification Group
; 7600-C N. Capital of Texas Highway, Suite 300, Austin, TX 78731, USA.
; http://www.centtech.com/
;
; 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., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
; subseq.lisp
;
; Original author: Jared Davis <jared@centtech.com>
(in-package "STR")
(local (include-book "arithmetic"))
(local (include-book "std/lists/take" :dir :system))
(local (include-book "std/lists/nthcdr" :dir :system))
(local (include-book "coerce"))
;; NOTE: These get globally disabled by including this book! This is probably
;; how things ought to be.
(in-theory (disable subseq subseq-list))
(local (in-theory (enable subseq subseq-list)))
(defthm len-of-subseq-list
(equal (len (subseq-list x start end))
(nfix (- end start))))
(defthm true-listp-subseq-list
(true-listp (subseq-list x start end))
:rule-classes :type-prescription)
(defthm stringp-of-subseq
(equal (stringp (subseq x start end))
(stringp x)))
(defthm length-of-subseq
(equal (length (subseq x start end))
(nfix (- (or end (length x)) start))))
(defthm len-of-subseq
(equal (len (subseq x start end))
(if (stringp x)
0
(nfix (- (or end (len x)) start)))))
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