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martinez 2004-05-10 15:43:18 +00:00
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// Copyright (C) 2003 Laboratoire d'Informatique de Paris 6 (LIP6),
// département Systèmes Répartis Coopératifs (SRC), Université Pierre
// et Marie Curie.
//
// This file is part of Spot, a model checking library.
//
// Spot is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// Spot is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
// License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Spot; see the file COPYING. If not, write to the Free
// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
#include "reducform.hh"
#include "ltlast/allnodes.hh"
#include <cassert>
#include "lunabbrev.hh"
#include "nenoform.hh"
#include "ltlvisit/destroy.hh"
namespace spot
{
namespace ltl
{
bool
is_GF(const formula* f)
{
if ((const unop*)f != NULL)
if (((const unop*)f)->op() == unop::G)
if ((const unop*)(((const unop*)f)->child()) != NULL)
if (((const unop*)((const unop*)f)->child())->op() == unop::F)
return true;
return false;
}
bool
is_FG(const formula* f)
{
if ((const unop*)f != NULL)
if (((const unop*)f)->op() == unop::F)
if ((const unop*)(((const unop*)f)->child()) != NULL)
if (((const unop*)((const unop*)f)->child())->op() == unop::G)
return true;
return false;
}
int
nb_term_multop(const formula* f)
{
if ((const multop*)f == NULL) return -1;
unsigned mos = ((const multop*)(f))->size();
return mos;
}
node_type_form_visitor::node_type_form_visitor(){}
node_type_form_visitor::type
node_type_form_visitor::result() const { return result_;}
void
node_type_form_visitor::visit(const atomic_prop* ap){
if (ap == NULL);
result_ = node_type_form_visitor::Atom;
}
void
node_type_form_visitor::visit(const constant* c){
if (c == NULL);
result_ = node_type_form_visitor::Const;
}
void
node_type_form_visitor::visit(const unop* uo){
if (uo == NULL);
result_ = node_type_form_visitor::Unop;
}
void
node_type_form_visitor::visit(const binop* bo){
if (bo == NULL);
result_ = node_type_form_visitor::Binop;
}
void
node_type_form_visitor::visit(const multop* mo){
if (mo == NULL);
result_ = node_type_form_visitor::Multop;
}
node_type_form_visitor::type node_type(const formula* f)
{
node_type_form_visitor v;
if (f == NULL) std::cout << "f == NULL !!!!!!!!" << std::endl;
const_cast<formula*>(f)->accept(v);
return v.result();
}
class form_eventual_universal_visitor : public const_visitor
{
public:
form_eventual_universal_visitor()
{
eventual = false; // faux au départ
universal = false;
}
virtual ~form_eventual_universal_visitor()
{
}
bool
is_eventual() const
{
return eventual;
}
bool
is_universal() const
{
return universal;
}
void
visit(const atomic_prop* ap)
{
if (ap);
}
void
visit(const constant* c)
{
if (c->val());
}
void
visit(const unop* uo)
{
const formula* f1 = uo->child();
switch (uo->op())
{
case unop::Not:
case unop::X:
eventual = recurse_ev(f1);
universal = recurse_un(f1);
return;
case unop::F:
eventual = true;
return;
case unop::G:
universal = true;
return;
}
/* Unreachable code. */
assert(0);
}
void
visit(const binop* bo)
{
const formula* f1 = bo->first();
switch (bo->op())
{
case binop::Xor:
case binop::Equiv:
case binop::Implies:
return;
case binop::U:
if (node_type(f1) == node_type_form_visitor::Const)
if (((const constant*)f1)->val() == constant::True)
eventual = true;
return;
case binop::R:
if (node_type(f1) != node_type_form_visitor::Const)
if (((const constant*)f1)->val() == constant::False)
universal = true;
return;
}
/* Unreachable code. */
assert(0);
}
void
visit(const multop* mo)
{
if (mo == NULL);
unsigned mos = mo->size();
eventual = true;
universal = true;
for (unsigned i = 0; i < mos; ++i){
if ( !(recurse_ev(mo->nth(i))) ){
eventual = false;
break;
}
}
for (unsigned i = 0; i < mos; ++i){
if ( !(recurse_un(mo->nth(i))) ){
universal = false;
break;
}
}
}
bool
recurse_ev(const formula* f)
{
form_eventual_universal_visitor v;
const_cast<formula*>(f)->accept(v);
return v.is_eventual();
}
bool
recurse_un(const formula* f)
{
form_eventual_universal_visitor v;
const_cast<formula*>(f)->accept(v);
return v.is_universal();
}
protected:
bool eventual;
bool universal;
};
bool is_eventual(const formula* f)
{
form_eventual_universal_visitor v;
const_cast<formula*>(f)->accept(v);
return v.is_eventual();
}
bool is_universal(const formula* f)
{
form_eventual_universal_visitor v;
const_cast<formula*>(f)->accept(v);
return v.is_universal();
}
/////////////////////////////////////////////////////////////////////////
class inf_form_right_recurse_visitor : public const_visitor
{
public:
inf_form_right_recurse_visitor(const formula *f)
{
this->f = f;
result_ = false; // faux au départ
}
virtual ~inf_form_right_recurse_visitor()
{
}
/*
bool special_case(const formula* f2,binop::operator op)
{
const binop* b = (const binop*)f;
const binop* b2 = (const binop*)f2;
if ((b != NULL) && (b2 != NULL) &&
(b->op() == b2_>op() == op))
if (inf_form(b2->first(),b->first())
&& inf_form(b2->second(),b->second()) )
return true;
return false;
}
*/
int
result() const
{
return result_;
}
void
visit(const atomic_prop* ap)
{
if ((const atomic_prop*)f == ap)
result_ = true;
}
void
visit(const constant* c)
{
switch (c->val())
{
case constant::True:
result_ = true;
return;
case constant::False:
result_ = false;
return;
}
}
void
visit(const unop* uo)
{
const formula* f1 = uo->child();
const formula* tmp = NULL;
switch (uo->op())
{
case unop::Not:// à gérer !!
return;
case unop::X:// à gérer !!
return;
case unop::F:
// F(a) = true U a
result_ = inf_form(f,f1);
return;
case unop::G:
// G(a) = false R a
tmp = constant::false_instance();
if ( inf_form(f,tmp) )
result_ = true;
spot::ltl::destroy(tmp);
return;
}
/* Unreachable code. */
assert(0);
}
void
visit(const binop* bo)
{
const formula* f1 = bo->first();
const formula* f2 = bo->second();
switch (bo->op())
{
case binop::Xor:
case binop::Equiv:
case binop::Implies:
return;
case binop::U:
if ( (inf_form(f,f2)) )
result_ = true;
return;
case binop::R:
if ( (inf_form(f,f1)) && (inf_form(f,f2)) )
result_ = true;
return;
}
/* Unreachable code. */
assert(0);
}
void
visit(const multop* mo)
{
if (mo == NULL);
multop::type op = mo->op();
unsigned mos = mo->size();
switch (op)
{
case multop::And:
for (unsigned i = 0; (i < mos) ; ++i)
if ( !(inf_form(f,mo->nth(i))) )
return;
result_ = true;
break;
case multop::Or:
for (unsigned i = 0; i < mos && !result_; ++i)
if ( (inf_form(f,mo->nth(i))) )
result_ = true;
break;
}
}
bool
recurse(const formula* f1, const formula* f2)
{
if (f1 == f2) return true;
inf_form_right_recurse_visitor v(f2);
const_cast<formula*>(f1)->accept(v);
return v.result();
}
protected:
bool result_; // true si f < f1, false sinon.
const formula* f;
};
/////////////////////////////////////////////////////////////////////////
class inf_form_left_recurse_visitor : public const_visitor
{
public:
inf_form_left_recurse_visitor(const formula *f)
{
this->f = f;
result_ = false;
}
virtual ~inf_form_left_recurse_visitor()
{
}
bool special_case(const formula* f2)
{
if ((node_type(f) == node_type_form_visitor::Binop)
&& (node_type(f2) == node_type_form_visitor::Binop))
if (((const binop*)f)->op() == ((const binop*)f2)->op())
if (inf_form(((const binop*)f2)->first(),((const binop*)f)->first())
&& inf_form(((const binop*)f2)->second(),((const binop*)f)->second()) )
return true;
return false;
}
int
result() const
{
return result_;
}
void
visit(const atomic_prop* ap)
{
inf_form_right_recurse_visitor v(ap);
const_cast<formula*>(f)->accept(v);
result_ = v.result();
}
void
visit(const constant* c)
{
inf_form_right_recurse_visitor v(c);
switch (c->val())
{
case constant::True:
const_cast<formula*>(f)->accept(v);
result_ = v.result();
return;
case constant::False:
result_ = true;
return;
}
/* Unreachable code. */
assert(0);
}
void
visit(const unop* uo)
{
const formula* f1 = uo->child();
const formula* tmp = NULL;
inf_form_right_recurse_visitor v(uo);
switch (uo->op())
{
case unop::Not:
if (uo == f)
result_ = true;
return;
case unop::X:
if (node_type(f) == node_type_form_visitor::Unop)
if (((const unop*)f)->op() == unop::X) {
result_ = inf_form(f1,((const unop*)f)->child());
}
return;
case unop::F:
// F(a) = true U a
tmp = binop::instance(binop::U,constant::true_instance(),clone(f1));
if (this->special_case(tmp)){
result_ = true;
spot::ltl::destroy(tmp);
return;
}
if ( inf_form(tmp,f) )
result_ = true;
spot::ltl::destroy(tmp);
return;
case unop::G:
// F(a) = false R a
tmp = binop::instance(binop::R,constant::false_instance(),clone(f1));
if (this->special_case(tmp)){
result_ = true;
spot::ltl::destroy(tmp);
return;
}
if ( inf_form(f1,f) )
result_ = true;
spot::ltl::destroy(tmp);
return;
}
/* Unreachable code. */
assert(0);
}
void
visit(const binop* bo)
{
if (this->special_case(bo))
{
result_ = true;
return;
}
const formula* f1 = bo->first();
const formula* f2 = bo->second();
switch (bo->op())
{
case binop::Xor:
case binop::Equiv:
case binop::Implies:
return;
case binop::U:
if ( (inf_form(f1,f)) && (inf_form(f2,f)) )
result_ = true;
return;
case binop::R:
if ( (inf_form(f2,f)) )
result_ = true;
return;
}
/* Unreachable code. */
assert(0);
}
void
visit(const multop* mo)
{
if (mo == NULL);
multop::type op = mo->op();
unsigned mos = mo->size();
switch (op)
{
case multop::And:
for (unsigned i = 0; (i < mos) && !result_ ; ++i)
if ( (inf_form(mo->nth(i),f)) )
result_ = true;
break;
case multop::Or:
for (unsigned i = 0; i < mos ; ++i)
if ( !(inf_form(mo->nth(i),f)) )
return;
result_ = true;
break;
}
}
protected:
bool result_; // true if f1 < f, 1 otherwise.
const formula* f;
};
bool inf_form(const formula* f1, const formula* f2)
{
// f1 and f2 are unabbreviate
if (f1 == f2) return true;
inf_form_left_recurse_visitor v1(f2);
inf_form_right_recurse_visitor v2(f1);
if ( (node_type(f1) == node_type_form_visitor::Const) &&
(node_type(f2) == node_type_form_visitor::Const) )
if ( (((const constant*)f2)->val() == constant::True) ||
(((const constant*)f1)->val() == constant::False) )
{
return true;
}
const_cast<formula*>(f1)->accept(v1);
if (v1.result()) {
return true;
}
const_cast<formula*>(f2)->accept(v2);
if (v2.result()) {
return true;
}
return false;
}
bool infneg_form(const formula* f1, const formula* f2, int n)
{
const formula* ftmp1;
const formula* ftmp2;
const formula* ftmp3 = unop::instance(unop::Not,(n == 0)? clone(f1) : clone(f2));
const formula* ftmp4 = spot::ltl::negative_normal_form((n == 0)? f2 : f1);
const formula* ftmp5;
const formula* ftmp6;
bool retour;
ftmp2 = spot::ltl::unabbreviate_logic(ftmp3);
ftmp1 = spot::ltl::negative_normal_form(ftmp2);
ftmp5 = spot::ltl::unabbreviate_logic(ftmp4);
ftmp6 = spot::ltl::negative_normal_form(ftmp5);
if (n == 0)
retour = inf_form(ftmp1, ftmp6);
else
retour = inf_form(ftmp6, ftmp1);
spot::ltl::destroy(ftmp1);
spot::ltl::destroy(ftmp2);
spot::ltl::destroy(ftmp3);
spot::ltl::destroy(ftmp4);
spot::ltl::destroy(ftmp5);
spot::ltl::destroy(ftmp6);
return retour;
}
}
}