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; Pseudo-term-fix.lisp: Fixing function for pseudo-terms, transparent to evaluators.
; Copyright (C) 2019 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: Sol Swords <sswords@centtech.com>
(in-package "ACL2")
(include-book "tools/flag" :dir :system)
;; Defines an induction scheme for the evaluator.
(defmacro def-ev-ind (ev ev-list)
(let* ((ev-ind (intern-in-package-of-symbol
(concatenate 'string (symbol-name ev) "-IND")
ev))
(ev-list-ind (intern-in-package-of-symbol
(concatenate 'string (symbol-name ev-list) "-IND")
ev-list))
(ev-flag (intern-in-package-of-symbol
(concatenate 'string (symbol-name ev) "-FLAG")
ev)))
`(progn
(mutual-recursion
(defun ,ev-ind (x a)
(cond ((atom x) (and x (symbolp x) (cdr (assoc x a))))
((eq (car x) 'quote) (cadr x))
((symbolp (car x)) (,ev-list-ind (cdr x) a))
((atom (car x)) nil)
(t (let* ((args (,ev-list (cdr x) a))
(new-a (pairlis$ (cadr (car x)) args)))
(list (,ev-ind (caddr (car x)) new-a)
(,ev-list-ind (cdr x) a))))))
(defun ,ev-list-ind (x a)
(if (atom x)
nil
(cons (,ev-ind (car x) a)
(,ev-list-ind (cdr x) a)))))
(flag::make-flag ,ev-flag ,ev-ind
:flag-mapping ((,ev-ind . ,ev)
(,ev-list-ind . ,ev-list))))))
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