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/********************* */
/*! \file candidate_generator.cpp
** \verbatim
** Original author: Morgan Deters
** Major contributors: Andrew Reynolds
** Minor contributors (to current version): none
** This file is part of the CVC4 project.
** Copyright (c) 2009-2014 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Implementation of theory uf candidate generator class
**/
#include "theory/quantifiers/candidate_generator.h"
#include "theory/theory_engine.h"
#include "theory/uf/theory_uf.h"
#include "theory/quantifiers/term_database.h"
#include "theory/quantifiers/inst_match.h"
#include "theory/quantifiers_engine.h"
#include "theory/quantifiers/options.h"
using namespace std;
using namespace CVC4;
using namespace CVC4::kind;
using namespace CVC4::context;
using namespace CVC4::theory;
using namespace CVC4::theory::inst;
bool CandidateGenerator::isLegalCandidate( Node n ){
return ( !n.getAttribute(NoMatchAttribute()) && ( !options::cbqi() || !quantifiers::TermDb::hasInstConstAttr(n) ) );
}
void CandidateGeneratorQueue::addCandidate( Node n ) {
if( isLegalCandidate( n ) ){
d_candidates.push_back( n );
}
}
void CandidateGeneratorQueue::reset( Node eqc ){
if( d_candidate_index>0 ){
d_candidates.erase( d_candidates.begin(), d_candidates.begin() + d_candidate_index );
d_candidate_index = 0;
}
if( !eqc.isNull() ){
d_candidates.push_back( eqc );
}
}
Node CandidateGeneratorQueue::getNextCandidate(){
if( d_candidate_index<(int)d_candidates.size() ){
Node n = d_candidates[d_candidate_index];
d_candidate_index++;
return n;
}else{
d_candidate_index = 0;
d_candidates.clear();
return Node::null();
}
}
CandidateGeneratorQE::CandidateGeneratorQE( QuantifiersEngine* qe, Node op ) :
d_op( op ), d_qe( qe ), d_term_iter( -1 ){
Assert( !d_op.isNull() );
}
void CandidateGeneratorQE::resetInstantiationRound(){
d_term_iter_limit = d_qe->getTermDatabase()->getNumGroundTerms( d_op );
}
void CandidateGeneratorQE::reset( Node eqc ){
d_term_iter = 0;
if( eqc.isNull() ){
d_mode = cand_term_db;
}else{
//create an equivalence class iterator in eq class eqc
//d_qe->getEqualityQuery()->getEquivalenceClass( eqc, d_eqc );
eq::EqualityEngine* ee = d_qe->getEqualityQuery()->getEngine();
if( ee->hasTerm( eqc ) ){
Node rep = ee->getRepresentative( eqc );
d_eqc_iter = eq::EqClassIterator( rep, ee );
d_mode = cand_term_eqc;
}else{
d_n = eqc;
d_mode = cand_term_ident;
}
//a should be in its equivalence class
//Assert( std::find( eqc.begin(), eqc.end(), a )!=eqc.end() );
}
}
bool CandidateGeneratorQE::isLegalOpCandidate( Node n ) {
if( n.hasOperator() ){
if( isLegalCandidate( n ) ){
return d_qe->getTermDatabase()->getOperator( n )==d_op;
}
}
return false;
}
Node CandidateGeneratorQE::getNextCandidate(){
if( d_mode==cand_term_db ){
//get next candidate term in the uf term database
while( d_term_iter<d_term_iter_limit ){
Node n = d_qe->getTermDatabase()->d_op_map[d_op][d_term_iter];
d_term_iter++;
if( isLegalCandidate( n ) ){
return n;
}
}
}else if( d_mode==cand_term_eqc ){
while( !d_eqc_iter.isFinished() ){
Node n = *d_eqc_iter;
++d_eqc_iter;
if( isLegalOpCandidate( n ) ){
return n;
}
}
}else if( d_mode==cand_term_ident ){
if( !d_n.isNull() ){
Node n = d_n;
d_n = Node::null();
if( isLegalOpCandidate( n ) ){
return n;
}
}
}
return Node::null();
}
//CandidateGeneratorQEDisequal::CandidateGeneratorQEDisequal( QuantifiersEngine* qe, Node eqc ) :
// d_qe( qe ), d_eq_class( eqc ){
// d_eci = NULL;
//}
//void CandidateGeneratorQEDisequal::resetInstantiationRound(){
//
//}
////we will iterate over all terms that are disequal from eqc
//void CandidateGeneratorQEDisequal::reset( Node eqc ){
// //Assert( !eqc.isNull() );
// ////begin iterating over equivalence classes that are disequal from eqc
// //d_eci = d_ith->getEquivalenceClassInfo( eqc );
// //if( d_eci ){
// // d_eqci_iter = d_eci->d_disequal.begin();
// //}
//}
//Node CandidateGeneratorQEDisequal::getNextCandidate(){
// //if( d_eci ){
// // while( d_eqci_iter != d_eci->d_disequal.end() ){
// // if( (*d_eqci_iter).second ){
// // //we have an equivalence class that is disequal from eqc
// // d_cg->reset( (*d_eqci_iter).first );
// // Node n = d_cg->getNextCandidate();
// // //if there is a candidate in this equivalence class, return it
// // if( !n.isNull() ){
// // return n;
// // }
// // }
// // ++d_eqci_iter;
// // }
// //}
// return Node::null();
//}
CandidateGeneratorQELitEq::CandidateGeneratorQELitEq( QuantifiersEngine* qe, Node mpat ) :
d_match_pattern( mpat ), d_qe( qe ){
}
void CandidateGeneratorQELitEq::resetInstantiationRound(){
}
void CandidateGeneratorQELitEq::reset( Node eqc ){
d_eq = eq::EqClassesIterator( d_qe->getEqualityQuery()->getEngine() );
}
Node CandidateGeneratorQELitEq::getNextCandidate(){
while( !d_eq.isFinished() ){
Node n = (*d_eq);
++d_eq;
if( n.getType().isSubtypeOf( d_match_pattern[0].getType() ) ){
//an equivalence class with the same type as the pattern, return reflexive equality
return NodeManager::currentNM()->mkNode( d_match_pattern.getKind(), n, n );
}
}
return Node::null();
}
CandidateGeneratorQELitDeq::CandidateGeneratorQELitDeq( QuantifiersEngine* qe, Node mpat ) :
d_match_pattern( mpat ), d_qe( qe ){
}
void CandidateGeneratorQELitDeq::resetInstantiationRound(){
}
void CandidateGeneratorQELitDeq::reset( Node eqc ){
Node false_term = d_qe->getEqualityQuery()->getEngine()->getRepresentative( NodeManager::currentNM()->mkConst<bool>(false) );
d_eqc_false = eq::EqClassIterator( false_term, d_qe->getEqualityQuery()->getEngine() );
}
Node CandidateGeneratorQELitDeq::getNextCandidate(){
//get next candidate term in equivalence class
while( !d_eqc_false.isFinished() ){
Node n = (*d_eqc_false);
++d_eqc_false;
if( n.getKind()==d_match_pattern.getKind() ){
//found an iff or equality, try to match it
//DO_THIS: cache to avoid redundancies?
//DO_THIS: do we need to try the symmetric equality for n? or will it also exist in the eq class of false?
return n;
}
}
return Node::null();
}
CandidateGeneratorQEAll::CandidateGeneratorQEAll( QuantifiersEngine* qe, Node mpat ) :
d_match_pattern( mpat ), d_qe( qe ){
}
void CandidateGeneratorQEAll::resetInstantiationRound() {
}
void CandidateGeneratorQEAll::reset( Node eqc ) {
d_eq = eq::EqClassesIterator( d_qe->getEqualityQuery()->getEngine() );
}
Node CandidateGeneratorQEAll::getNextCandidate() {
while( !d_eq.isFinished() ){
Node n = (*d_eq);
++d_eq;
if( n.getType().isSubtypeOf( d_match_pattern.getType() ) ){
//an equivalence class with the same type as the pattern, return it
return n;
}
}
return Node::null();
}
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