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/*
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* Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of The TenDRA Project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific, prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*/
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/*
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Crown Copyright (c) 1997
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This TenDRA(r) Computer Program is subject to Copyright
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owned by the United Kingdom Secretary of State for Defence
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acting through the Defence Evaluation and Research Agency
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(DERA). It is made available to Recipients with a
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royalty-free licence for its use, reproduction, transfer
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to other parties and amendment for any purpose not excluding
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product development provided that any such use et cetera
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shall be deemed to be acceptance of the following conditions:-
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(1) Its Recipients shall ensure that this Notice is
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reproduced upon any copies or amended versions of it;
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(2) Any amended version of it shall be clearly marked to
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show both the nature of and the organisation responsible
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for the relevant amendment or amendments;
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(3) Its onward transfer from a recipient to another
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party shall be deemed to be that party's acceptance of
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these conditions;
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(4) DERA gives no warranty or assurance as to its
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quality or suitability for any purpose and DERA accepts
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no liability whatsoever in relation to any use to which
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it may be put.
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*/
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/**********************************************************************
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$Author: release $
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$Date: 1998/01/17 15:55:46 $
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$Revision: 1.1.1.1 $
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$Log: complex_eq.c,v $
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* Revision 1.1.1.1 1998/01/17 15:55:46 release
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* First version to be checked into rolling release.
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*
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* Revision 1.1 1995/04/06 10:44:05 currie
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* Initial revision
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*
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***********************************************************************/
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/* a rather more complicated equivalence of expressions - allows sequences and
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conditionals with tests which only jump to nearest conditional outlab;
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initial call : comp_eq_exp(a,b,nilexp,nilexp) */
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#include "config.h"
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#include "common_types.h"
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#include "tags.h"
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#include "expmacs.h"
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#include "shapemacs.h"
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#include "exp.h"
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#include "complex_eq.h"
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static int
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complex_eq_explist(exp a, exp b, exp laba, exp labb)
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{
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if (a == nilexp) return(b == nilexp);
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if (b == nilexp || !complex_eq_exp(a,b,laba,labb)) return 0;
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if (last(a)) return(last(b));
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if (last(b)) return 0;
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return complex_eq_explist(bro(a), bro(b), laba, labb);
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}
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int
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complex_eq_exp(exp a, exp b, exp laba, exp labb)
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{
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if (name(a) != name(b) || !eq_shape(sh(a), sh(b))) {
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return 0;
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}
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if (name(a) == seq_tag) {
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return(complex_eq_explist(son(son(a)), son(son(b)), laba,
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labb) &&
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complex_eq_exp(bro(son(a)), bro(son(b)),laba,labb));
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}
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if (name(a) == cond_tag) {
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exp fa = son(a);
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exp fb = son(b);
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return(complex_eq_exp(fa,fb, bro(fa), bro(fb)) &&
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complex_eq_exp(bro(son(bro(fa))), bro(son(bro(fb))),
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laba, labb));
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}
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if (name(a) ==test_tag) {
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return(pt(a) ==laba && pt(b) ==labb && props(a) ==props(b) &&
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complex_eq_explist(son(a),son(b), laba, labb));
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}
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if (name(a) ==name_tag) {
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return(son(a) ==son(b) && no(a) ==no(b));
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}
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return(is_a(name(a)) && no(a) ==no(b) &&
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complex_eq_explist(son(a), son(b), laba, labb));
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}
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