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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 | ; let-syms/symlet -- hack to replace symbols with expressions
; Copyright (C) 2017 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
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; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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; Original author: Sol Swords <sswords@centtech.com>
(in-package "ACL2")
(include-book "std/util/bstar" :dir :system)
(defmacro let-syms (bindings term)
(sublis (pairlis$ (strip-cars bindings)
(strip-cars (strip-cdrs bindings)))
term))
(acl2::def-b*-binder symlet
:body
(cond ((and (eql (len acl2::args) 1)
(eql (len acl2::forms) 1))
`(let-syms
((,(car acl2::args) ,(car acl2::forms)))
,acl2::rest-expr))
((and (acl2::doublet-listp acl2::args) (not acl2::forms))
`(let-syms ,acl2::args ,acl2::rest-expr))
(t
(er hard? 'symlet "Symlet takes either exactly 1 argument and 1 ~
form, or a doublet-list as arguments and no form"))))
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