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; Milawa - A Reflective Theorem Prover
; Copyright (C) 2005-2009 Kookamara LLC
;
; Contact:
;
; Kookamara LLC
; 11410 Windermere Meadows
; Austin, TX 78759, USA
; http://www.kookamara.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@kookamara.com>
(in-package "MILAWA")
(include-book "utilities")
(set-verify-guards-eagerness 2)
(set-case-split-limitations nil)
(set-well-founded-relation ord<)
(set-measure-function rank)
(defund clean-update (key val map)
;; BOZO move to utilities
;;
;; This is like (update key val map), but it does the update "in place"
;; instead of consing onto the front of the list.
(declare (xargs :guard (mapp map)))
(if (consp map)
(if (equal (car (car map)) key)
(cons (cons key val) (cdr map))
(cons (car map) (clean-update key val (cdr map))))
(list (cons key val))))
(defthm clean-update-when-not-consp
(implies (not (consp map))
(equal (clean-update key val map)
(list (cons key val))))
:hints(("Goal" :in-theory (enable clean-update))))
(defthm clean-update-of-cons
(equal (clean-update key val (cons a map))
(if (equal (car a) key)
(cons (cons key val) map)
(cons a
(clean-update key val map))))
:hints(("Goal" :in-theory (enable clean-update))))
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