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; 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/
;
; License: (An MIT/X11-style license)
;
; Permission is hereby granted, free of charge, to any person obtaining a
; copy of this software and associated documentation files (the "Software"),
; to deal in the Software without restriction, including without limitation
; the rights to use, copy, modify, merge, publish, distribute, sublicense,
; and/or sell copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
; DEALINGS IN THE SOFTWARE.
;
; Original author: Jared Davis <jared@centtech.com>
(in-package "STR")
(include-book "coerce")
(include-book "std/util/bstar" :dir :system)
(local (include-book "explode-atom"))
(local (include-book "arithmetic"))
(local (in-theory (disable explode-atom)))
(defsection insert-underscores
:parents (hexify)
(defund insert-underscores (x)
(declare (xargs :guard t))
(cond ((atom x)
x)
((equal (mod (len x) 4) 0)
(list* #\_ (car x) (insert-underscores (cdr x))))
(t
(list* (car x) (insert-underscores (cdr x))))))
(local (in-theory (enable insert-underscores)))
(defthm character-listp-of-insert-underscores
(implies (force (character-listp x))
(character-listp (insert-underscores x)))))
(defsection hexify
:parents (numbers)
:short "Convert numbers into readable hex strings."
:long "<p>@(call hexify) is a dumb but useful printing utility for displaying
numbers in hex. It is typically used in @(see cw) statements, e.g.,:</p>
@({
ACL2 !> (cw \"foo is ~s0~%\" (str::hexify (1- (expt 2 32))))
foo is #uxFFFF_FFFF
NIL
ACL2 !>
})
<p>The @('#ux') is for compatibility with the @(see acl2::sharp-u-reader).</p>
<p>See also @(see natstr) which converts numbers into decimal strings (without
underscores) and @(see binify) which is like @('hexify') but for binary instead
of hex.</p>
<h3>Usage</h3>
<p>@(call hexify) always returns a @(see stringp).</p>
<p>@('x') must be an integer, string, or symbol; otherwise a @(see hard-error)
will be caused.</p>
<p>Normally @('x') is an integer. In this case, we convert it into an
msb-first hex string with an underscore inserted every four characters. This
makes it easier to read long values.</p>
<p>When @('x') is a string we just return it unchanged.</p>
<p>When @('x') is a symbol we just return its name.</p>"
(defun hexify (x)
(declare (xargs :guard t))
(cond ((integerp x)
(b* ((xsign (< x 0))
(xabs (abs x))
(chars (explode-atom xabs 16)) ;; looks like BEEF...
(nice-chars (list* #\# #\u #\x
(append (and xsign '(#\-))
(cons (first chars)
(insert-underscores (nthcdr 1 chars)))))))
(implode nice-chars)))
((symbolp x)
(symbol-name x))
((stringp x)
x)
(t
(prog2$ (er hard? 'hexify "Unexpected argument ~x0.~%" x)
"")))))
(defsection binify
:parents (numbers)
:short "Convert numbers into readable binary strings."
:long "<p>@(call binify) is identical to @(see str::hexify) except that it
produces binary output instead of hex output.</p>"
(defun binify (x)
(declare (xargs :guard t))
(cond ((integerp x)
(b* ((xsign (< x 0))
(xabs (abs x))
(chars (explode-atom xabs 2))
(nice-chars (list* #\# #\u #\b
(append (and xsign '(#\-))
(cons (first chars)
(insert-underscores (nthcdr 1 chars)))))))
(implode nice-chars)))
((symbolp x)
(symbol-name x))
((stringp x)
x)
(t
(prog2$ (er hard? 'binify "Unexpected argument ~x0.~%" x)
"")))))
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