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formulas.cc
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formulas.cc
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#include "domains.h"
#include "exceptions.h"
#include "expressions.h"
#include "formulas.h"
#include "problems.h"
#include "states.h"
#include "strxml.h"
#include <sstream>
#include <stack>
const StateFormula& StateFormula::TRUE = Constant::TRUE_;
const StateFormula& StateFormula::FALSE = Constant::FALSE_;
const Constant Constant::TRUE_(true);
const Constant Constant::FALSE_(false);
Atom::AtomTable Atom::atoms;
static unsigned internal_predicate_index = 0;
/*******************************************************************************
*
* constant
*
******************************************************************************/
Constant::Constant( bool value )
: value_(value)
{
StateFormula::register_use(this);
notify( this, "Constant::Constant(bool)" );
}
bool
Constant::holds( const AtomSet& atoms, const ValueMap& values ) const
{
return( value_ );
}
bool
Constant::holds( const state_t& state ) const
{
return( value_ );
}
const StateFormula&
Constant::flatten( bool negated ) const
{
StateFormula::register_use( this );
return( *this );
}
void
Constant::translate( atomList_t &alist ) const
{
}
void
Constant::translate( atomListList_t &alist ) const
{
atomList_t *al = new atomList_t;
translate( *al );
alist.insert( al );
}
const Constant&
Constant::instantiation( const SubstitutionMap& subst,
const problem_t& problem) const
{
StateFormula::register_use( this );
return( *this );
}
bool
Constant::operator==( const StateFormula &formula ) const
{
const Constant *cons = dynamic_cast<const Constant*>( &formula );
return( (cons != NULL) && (value_ == cons->value_) );
}
void
Constant::print( std::ostream& os, const PredicateTable& predicates,
const FunctionTable& functions, const TermTable& terms ) const
{
os << (value_?"(and)":"(or)");
}
bool
Constant::match( const StateFormula &formula, VarSubstMap &subst ) const
{
return( *this == formula );
}
void
Constant::free_vars( VariableList &context, VariableList &vars ) const
{
}
bool
Constant::analyze( PredicateTable &predicates, TermTable &terms,
std::map<const StateFormula*,const Atom*> &hash ) const
{
return( true );
}
const StateFormula&
Constant::rewrite( std::map<const StateFormula*,const Atom*> &hash ) const
{
StateFormula::register_use( this );
return( *this );
}
void
Constant::generate_atoms( void ) const
{
}
/*******************************************************************************
*
* atom
*
******************************************************************************/
bool
Atom::AtomLess::operator()( const Atom* a1, const Atom* a2 ) const
{
if( a1->predicate() < a2->predicate() )
return( true );
else if( a1->predicate() > a2->predicate() )
return( false );
else
{
for( size_t i = 0; i < a1->arity(); ++i )
{
if( a1->term( i ) < a2->term( i ) )
return( true );
else if( a1->term( i ) > a2->term( i ) )
return( false );
}
}
return( false );
}
const Atom&
Atom::make_atom( Predicate predicate, const TermList& terms )
{
Atom *atom = new Atom( predicate );
bool ground = true;
for( TermList::const_iterator ti = terms.begin(); ti != terms.end(); ++ti )
{
atom->add_term( *ti );
ground = ground && is_object( *ti );
}
if( !ground )
{
return( *atom );
}
else
{
std::pair<AtomTable::const_iterator,bool> result = atoms.insert( atom );
if( !result.second )
{
StateFormula::unregister_use( atom );
StateFormula::register_use( *result.first );
return( **result.first );
}
else
{
return( *atom );
}
}
}
Atom::Atom( Predicate predicate )
: predicate_(predicate)
{
StateFormula::register_use( this );
notify( this, "Atom::Atom(Predicate)" );
}
Atom::~Atom()
{
AtomTable::const_iterator ai = atoms.find( this );
if( (ai != atoms.end()) && (*ai == this) ) atoms.erase( ai );
}
bool
Atom::holds( const AtomSet& atoms, const ValueMap& values ) const
{
return( atoms.find(this) != atoms.end() );
}
bool
Atom::holds( const state_t& state ) const
{
return( state.holds( *this ) );
}
const Atom&
Atom::substitution( const SubstitutionMap& subst ) const
{
TermList inst_terms;
bool substituted = false;
for( TermList::const_iterator ti = terms_.begin(); ti != terms_.end(); ++ti )
{
SubstitutionMap::const_iterator si = (is_variable( *ti )?subst.find( *ti ):subst.end());
if( si != subst.end() )
{
inst_terms.push_back( (*si).second );
substituted = true;
}
else
inst_terms.push_back( *ti );
}
if( substituted )
return( make_atom( predicate(), inst_terms ) );
else
{
StateFormula::register_use( this );
return( *this );
}
}
const StateFormula&
Atom::flatten( bool negated ) const
{
if( !negated )
{
StateFormula::register_use( this );
return( *this );
}
else
{
return( Negation::make_negation( *this ) );
}
}
void
Atom::translate( atomList_t &alist ) const
{
ushort_t atom = problem_t::atom_hash_get( *this );
alist.insert( atom );
}
void
Atom::translate( atomListList_t &alist ) const
{
atomList_t *al = new atomList_t;
translate( *al );
alist.insert( al );
}
const StateFormula&
Atom::instantiation( const SubstitutionMap& subst,
const problem_t& problem ) const
{
TermList inst_terms;
bool substituted = false, ground = true;
size_t objects = 0;
for( TermList::const_iterator ti = terms_.begin(); ti != terms_.end(); ++ti )
{
SubstitutionMap::const_iterator si = (is_variable( *ti )?subst.find( *ti ):subst.end());
if( si != subst.end() )
{
inst_terms.push_back( (*si).second );
substituted = true;
++objects;
}
else
{
inst_terms.push_back( *ti );
if( is_object(*ti) )
++objects;
else
ground = false;
}
}
if( substituted || ground )
{
const Atom& inst_atom = make_atom( predicate(), inst_terms );
if( problem.domain().predicates().static_predicate( predicate() ) &&
(objects == inst_terms.size()) )
{
if( problem.init_atoms().find( &inst_atom ) != problem.init_atoms().end() )
{
StateFormula::unregister_use( &inst_atom );
StateFormula::register_use( &TRUE );
return( TRUE );
}
else
{
StateFormula::unregister_use( &inst_atom );
StateFormula::register_use( &FALSE );
return( FALSE );
}
}
else
{
return( inst_atom );
}
}
else
{
StateFormula::register_use( this );
return( *this );
}
}
bool
Atom::operator==( const StateFormula &formula ) const
{
const Atom *at = dynamic_cast<const Atom*>( &formula );
if( (at != NULL) && (predicate() == at->predicate()) )
{
for( size_t i = 0; i < arity(); ++i )
if( !(term( i ) == at->term( i )) )
return( false );
return( true );
}
return( false );
}
void
Atom::print( std::ostream& os, const PredicateTable& predicates,
const FunctionTable& functions, const TermTable& terms ) const {
os << '(';
predicates.print_predicate( os, predicate() );
for( TermList::const_iterator ti = terms_.begin(); ti != terms_.end(); ++ti )
{
os << ' ';
terms.print_term( os, *ti );
}
os << ')';
}
void
Atom::printXML( std::ostream& os, const PredicateTable& predicates,
const FunctionTable& functions, const TermTable& terms) const
{
os << "<atom><predicate>";
predicates.print_predicate( os, predicate() );
os << "</predicate>";
for( TermList::const_iterator ti = terms_.begin(); ti != terms_.end(); ++ti )
{
os << "<term>";
terms.print_term( os, *ti );
os << "</term>";
}
os << "</atom>";
}
bool
Atom::match( const StateFormula &formula, VarSubstMap &subst ) const
{
const Atom *at = dynamic_cast<const Atom*>( &formula );
if( (at != NULL) && (predicate() == at->predicate()) )
{
for( size_t i = 0; i < arity(); ++i )
{
if( is_object( term(i) ) && (term(i) != at->term(i)) )
return( false );
else if( is_variable( term(i) ) )
{
VarSubstMap::const_iterator it = subst.find( term( i ) );
if( (it == subst.end()) && (term(i) != at->term(i)) )
return( false );
else if( (it != subst.end()) && ((*it).second != at->term(i)) )
return( false );
}
}
return( true );
}
return( false );
}
void
Atom::free_vars( VariableList &context, VariableList &vars ) const
{
for( TermList::const_iterator ti = terms_.begin(); ti != terms_.end(); ++ti )
if( is_variable( *ti ) )
{
VariableList::const_iterator vi;
// check whether variable is in context
for( vi = context.begin(); vi != context.end(); ++vi )
if( *vi == *ti ) break;
if( vi != context.end() ) continue;
// check whether free variable is already in list of vars
for( vi = vars.begin(); vi != vars.end(); ++vi )
if( *vi == *ti ) break;
if( vi == vars.end() ) vars.push_back( *ti );
}
}
bool
Atom::analyze( PredicateTable &predicates, TermTable &terms,
std::map<const StateFormula*,const Atom*> &hash ) const
{
return( true );
}
const StateFormula&
Atom::rewrite( std::map<const StateFormula*,const Atom*> &hash ) const
{
Atom *atom = new Atom( predicate() );
for( TermList::const_iterator ti = terms_.begin(); ti != terms_.end(); ++ti )
atom->add_term( *ti );
return( *atom );
}
void
Atom::generate_atoms( void ) const
{
problem_t::atom_hash_get( *this );
}
/*******************************************************************************
*
* equality
*
******************************************************************************/
Equality::Equality( Term term1, Term term2 )
: term1_(term1), term2_(term2)
{
StateFormula::register_use( this );
notify( this, "Equality::Equality(Term,Term)" );
}
Equality::~Equality()
{
}
bool
Equality::holds( const AtomSet& atoms, const ValueMap& values ) const
{
throw Exception( "Equality::holds() erroneously called" );
}
bool
Equality::holds( const state_t& state ) const
{
throw Exception( "Equality::holds() erroneously called" );
}
const StateFormula&
Equality::flatten( bool negated ) const
{
throw Exception( "Equality::flatten() error: unsupported formula" );
}
void
Equality::translate( atomList_t &alist ) const
{
throw Exception( "Equality::translate() error: unsupported formula" );
}
void
Equality::translate( atomListList_t &alist ) const
{
throw Exception( "Equality::translate() error: unsupported formula" );
}
const StateFormula&
Equality::instantiation( const SubstitutionMap& subst,
const problem_t& problem) const
{
Term inst_term1 = term1_;
if( is_variable( inst_term1 ) )
{
const SubstitutionMap::const_iterator si = subst.find( inst_term1 );
if( si != subst.end() )
inst_term1 = (*si).second;
}
Term inst_term2 = term2_;
if( is_variable( inst_term2 ) )
{
const SubstitutionMap::const_iterator si = subst.find( inst_term2 );
if( si != subst.end() )
inst_term2 = (*si).second;
}
if( is_object( inst_term1 ) && is_object( inst_term2 ) )
{
if( inst_term1 == inst_term2 )
{
StateFormula::register_use( &TRUE );
return( TRUE );
}
else
{
StateFormula::register_use( &FALSE );
return( FALSE );
}
}
else if( ((inst_term1 == term1_) && (inst_term2 == term2_)) ||
((inst_term2 == term1_) && (inst_term1 == term2_)) )
{
StateFormula::register_use( this );
return( *this );
}
else
return( *new Equality( inst_term1, inst_term2 ) );
}
bool
Equality::operator==( const StateFormula &formula ) const
{
const Equality *eq = dynamic_cast<const Equality*>( &formula );
return( (eq != NULL) && (term1() == eq->term1()) && (term2() == eq->term2()) );
}
void
Equality::print( std::ostream& os, const PredicateTable& predicates,
const FunctionTable& functions, const TermTable& terms) const
{
os << "(= ";
terms.print_term( os, term1() );
os << ' ';
terms.print_term( os, term2() );
os << ")";
}
bool
Equality::match( const StateFormula &formula, VarSubstMap &subst ) const
{
const Equality *eq = dynamic_cast<const Equality*>( &formula );
if( eq != NULL )
{
if( is_variable( term1() ) )
{
VarSubstMap::const_iterator it = subst.find( term1() );
if( ((it == subst.end()) && (term1() != eq->term1())) ||
((it != subst.end()) && ((*it).second != eq->term1())) )
return( false );
}
else if( term1() != eq->term1() )
return( false );
if( is_variable( term2() ) )
{
VarSubstMap::const_iterator it = subst.find( term2() );
if( ((it == subst.end()) && (term2() != eq->term2())) ||
((it != subst.end()) && ((*it).second != eq->term2())) )
return( false );
}
else if( term2() != eq->term2() )
return( false );
}
return( false );
}
void
Equality::free_vars( VariableList &context, VariableList &vars ) const
{
VariableList::const_iterator vi;
if( is_variable( term1() ) )
{
// check whether term1 is in context
for( vi = context.begin(); vi != context.end(); ++vi )
if( *vi == term1() ) break;
if( vi == context.end() )
{
// check whether term1 is already in list of free vars
for( vi = vars.begin(); vi != vars.end(); ++vi )
if( *vi == term1() ) break;
if( vi == vars.end() ) vars.push_back( term1() );
}
}
if( is_variable( term2() ) )
{
// check whether term2 is in context
for( vi = context.begin(); vi != context.end(); ++vi )
if( *vi == term2() ) break;
if( vi == context.end() )
{
// check whether term2 is already in list of free vars
for( vi = vars.begin(); vi != vars.end(); ++vi )
if( *vi == term2() ) break;
if( vi == vars.end() ) vars.push_back( term2() );
}
}
}
bool
Equality::analyze( PredicateTable &predicates, TermTable &terms,
std::map<const StateFormula*,const Atom*> &hash ) const
{
return( true );
}
const StateFormula&
Equality::rewrite( std::map<const StateFormula*,const Atom*> &hash ) const
{
Equality *eq = new Equality( term1(), term2() );
return( *eq );
}
void
Equality::generate_atoms( void ) const
{
throw Exception( "Equality::generate_atoms() erroneously called" );
}
/*******************************************************************************
*
* comparison
*
******************************************************************************/
Comparison::Comparison( CmpPredicate predicate, const Expression& expr1,
const Expression& expr2 )
: predicate_(predicate), expr1_(&expr1), expr2_(&expr2)
{
StateFormula::register_use( this );
Expression::register_use( expr1_ );
Expression::register_use( expr2_ );
notify( this, "Comparison::Comparison(CmpPredicate,Expression&,Expression&)" );
}
Comparison::~Comparison()
{
Expression::unregister_use( expr1_ );
Expression::unregister_use( expr2_ );
}
bool
Comparison::holds( const AtomSet& atoms, const ValueMap& values ) const
{
if( predicate() == LT_CMP )
return( expr1().value(values) < expr2().value(values) );
else if( predicate() == LE_CMP )
return( expr1().value(values) <= expr2().value(values) );
else if( predicate() == EQ_CMP )
return( expr1().value(values) == expr2().value(values) );
else if( predicate() == GE_CMP )
return( expr1().value(values) >= expr2().value(values) );
else // predicate()_ == GT_CMP
return( expr1().value(values) > expr2().value(values) );
}
bool
Comparison::holds( const state_t& state ) const
{
throw Exception( "Comparison::holds() erroneously called" );
}
const StateFormula&
Comparison::flatten( bool negated ) const
{
throw Exception( "Comparison::flatten: error: unsupported formula" );
}
void
Comparison::translate( atomList_t &alist ) const
{
throw Exception( "Comparison::translate: error: unsupported formula" );
}
void
Comparison::translate( atomListList_t &alist ) const
{
throw Exception( "Comparison::translate: error: unsupported formula" );
}
const StateFormula&
Comparison::instantiation( const SubstitutionMap& subst, const problem_t& problem) const
{
const Expression& inst_expr1 = expr1().instantiation( subst, problem );
const Expression& inst_expr2 = expr2().instantiation( subst, problem );
const Value* v1 = dynamic_cast<const Value*>( &inst_expr1 );
if( v1 != NULL )
{
const Value* v2 = dynamic_cast<const Value*>( &inst_expr2 );
if( v2 != NULL )
{
bool value;
if( predicate() == LT_CMP )
value = (v1->value() < v2->value());
else if( predicate() == LE_CMP )
value = (v1->value() <= v2->value());
else if( predicate() == EQ_CMP )
value = (v1->value() == v2->value());
else if( predicate() == GE_CMP )
value = (v1->value() >= v2->value());
else // predicate() == GT_CMP
value = (v1->value() > v2->value());
Expression::unregister_use( v1 );
Expression::unregister_use( v2 );
if( value )
{
StateFormula::register_use( &TRUE );
return( TRUE );
}
else
{
StateFormula::register_use( &FALSE );
return( FALSE );
}
}
}
const StateFormula *result = new Comparison( predicate(), inst_expr1, inst_expr2 );
Expression::unregister_use( &inst_expr1 );
Expression::unregister_use( &inst_expr2 );
return( *result );
}
bool
Comparison::operator==( const StateFormula &formula ) const
{
const Comparison *comp = dynamic_cast<const Comparison*>( &formula );
return( (comp != NULL) && (predicate() == comp->predicate()) &&
(expr1() == comp->expr1()) && (expr2() == comp->expr2()) );
}
void
Comparison::print( std::ostream& os, const PredicateTable& predicates,
const FunctionTable& functions, const TermTable& terms) const
{
os << '(';
if( predicate() == LT_CMP )
os << '<';
else if( predicate() == LE_CMP )
os << "<=";
else if( predicate() == EQ_CMP )
os << '=';
else if( predicate() == GE_CMP )
os << ">=";
else // predicate() == GT_CMP
os << '>';
os << ' ';
expr1().print( os, functions, terms );
os << ' ';
expr2().print( os, functions, terms );
os << ')';
}
bool
Comparison::match( const StateFormula &formula, VarSubstMap &subst ) const
{
throw Exception( "`Comparison::match()' not yet implemented" );
}
void
Comparison::free_vars( VariableList &context, VariableList &vars ) const
{
throw Exception( "`Comparison::free_vars()' not yet implemented" );
}
bool
Comparison::analyze( PredicateTable &predicates, TermTable &terms,
std::map<const StateFormula*,const Atom*> &hash ) const
{
return( true );
}
const StateFormula&
Comparison::rewrite( std::map<const StateFormula*,const Atom*> &hash ) const
{
Comparison *cmp = new Comparison( predicate(), expr1(), expr2() );
return( *cmp );
}
void
Comparison::generate_atoms( void ) const
{
throw Exception( "Comparison::generate_atoms() erroneously called" );
}
/*******************************************************************************
*
* negation
*
******************************************************************************/
const StateFormula&
Negation::make_negation( const StateFormula& formula )
{
if( formula.tautology() )
{
StateFormula::unregister_use( &formula );
StateFormula::register_use( &FALSE );
return( FALSE );
}
else if( formula.contradiction() )
{
StateFormula::unregister_use( &formula );
StateFormula::register_use( &TRUE );
return( TRUE );
}
else
{
const StateFormula *result = new Negation( formula );
StateFormula::unregister_use( &formula );
return( *result );
}
}
Negation::Negation( const StateFormula& negand )
: negand_(&negand)
{
StateFormula::register_use( this );
StateFormula::register_use( negand_ );
notify( this, "Negation::Negation(StateFormula&)" );
}
Negation::~Negation()
{
StateFormula::unregister_use( negand_ );
}
bool
Negation::holds( const AtomSet& atoms, const ValueMap& values ) const
{
return( !negand().holds( atoms, values ) );
}
bool
Negation::holds( const state_t& state ) const
{
return( !negand().holds( state ) );
}
const StateFormula&
Negation::flatten( bool negated ) const
{
return( negand().flatten( !negated ) );
}
void
Negation::translate( atomList_t &alist ) const
{
const Atom *atom = dynamic_cast<const Atom*>( &negand() );
if( atom != NULL )
{
ushort_t atm = problem_t::atom_hash_get( *atom, true );
alist.insert( atm );
}
else
throw Exception( "Negation::translate: error: unsupported formula" );
}
void
Negation::translate( atomListList_t &alist ) const
{
atomList_t *al = new atomList_t;
translate( *al );
alist.insert( al );
}
const StateFormula&
Negation::instantiation( const SubstitutionMap& subst,
const problem_t& problem) const
{
const StateFormula& inst_negand = negand().instantiation( subst, problem );
if( inst_negand.contradiction() )
{
StateFormula::unregister_use( &inst_negand );
StateFormula::register_use( &TRUE );
return( TRUE );
}
else if( inst_negand.tautology() )
{
StateFormula::unregister_use( &inst_negand );
StateFormula::register_use( &FALSE );
return( FALSE );
}
else
{
const StateFormula *result = new Negation( inst_negand );
StateFormula::unregister_use( &inst_negand );
return( *result );
}
}
bool
Negation::operator==( const StateFormula &formula ) const
{
const Negation *neg = dynamic_cast<const Negation*>( &formula );
return( (neg != NULL) && (negand() == neg->negand()) );
}
void
Negation::print( std::ostream& os, const PredicateTable& predicates,
const FunctionTable& functions, const TermTable& terms) const
{
os << "(not ";
negand().print( os, predicates, functions, terms );
os << ")";
}
bool
Negation::match( const StateFormula &formula, VarSubstMap &subst ) const
{
const Negation *neg = dynamic_cast<const Negation*>( &formula );
return( (neg != NULL) && negand().match( neg->negand(), subst ) );
}
void
Negation::free_vars( VariableList &context, VariableList &vars ) const
{
negand().free_vars( context, vars );
}
bool
Negation::analyze( PredicateTable &predicates, TermTable &terms,
std::map<const StateFormula*,const Atom*> &hash ) const
{
return( negand().analyze( predicates, terms, hash ) );
}
const StateFormula&
Negation::rewrite( std::map<const StateFormula*,const Atom*> &hash ) const
{
return( Negation::make_negation( negand().rewrite( hash ) ) );
}
void
Negation::generate_atoms( void ) const
{
negand().generate_atoms();
}
/*******************************************************************************
*
* conjunction
*
******************************************************************************/
Conjunction::Conjunction()
{
StateFormula::register_use( this );
notify( this, "Conjunction::Conjunction()" );
}
Conjunction::~Conjunction()
{
for( FormulaList::const_iterator fi = conjuncts_.begin(); fi != conjuncts_.end(); ++fi )
StateFormula::unregister_use( *fi );
}
void
Conjunction::cross_products( std::list<const Disjunction*>::const_iterator it,
std::list<const Disjunction*>::const_iterator end,
std::list<const StateFormula*> &flist,
std::list<const Conjunction*> &xproduct )
{
if( it == end )
{
Conjunction *conj = new Conjunction;
for( std::list<const StateFormula*>::const_iterator i = flist.begin(); i != flist.end(); ++i )
{
if( dynamic_cast<const Conjunction*>( (*i) ) )
{
const Conjunction *f = (const Conjunction*)(*i);
for( size_t j = 0; j < f->size(); ++j )
{
StateFormula::register_use( &f->conjunct( j ) );
conj->add_conjunct( f->conjunct( j ) );
}
}
else
{
StateFormula::register_use( (*i) );
conj->add_conjunct( *(*i) );
}
}
xproduct.push_back( conj );
}
else
{
for( size_t i = 0; i < (*it)->size(); ++i )
{
flist.push_back( &(*it)->disjunct( i ) );
++it;
cross_products( it, end, flist, xproduct );
--it;
flist.pop_back();
}
}
}