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/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
#include "atn/ATNConfig.h"
#include "atn/ATNConfigSet.h"
#include "atn/SemanticContext.h"
#include "misc/MurmurHash.h"
#include "dfa/DFAState.h"
using namespace antlr4::dfa;
using namespace antlr4::atn;
DFAState::PredPrediction::PredPrediction(const Ref<SemanticContext>& pred,
int alt)
: pred(pred) {
InitializeInstanceFields();
this->alt = alt;
}
DFAState::PredPrediction::~PredPrediction() {}
std::string DFAState::PredPrediction::toString() {
return std::string("(") + pred->toString() + ", " + std::to_string(alt) + ")";
}
void DFAState::PredPrediction::InitializeInstanceFields() { alt = 0; }
DFAState::DFAState() { InitializeInstanceFields(); }
DFAState::DFAState(int state) : DFAState() { stateNumber = state; }
DFAState::DFAState(std::unique_ptr<ATNConfigSet> configs_) : DFAState() {
configs = std::move(configs_);
}
DFAState::~DFAState() {
for (auto predicate : predicates) {
delete predicate;
}
}
std::set<size_t> DFAState::getAltSet() {
std::set<size_t> alts;
if (configs != nullptr) {
for (size_t i = 0; i < configs->size(); i++) {
alts.insert(configs->get(i)->alt);
}
}
return alts;
}
size_t DFAState::hashCode() const {
size_t hash = misc::MurmurHash::initialize(7);
hash = misc::MurmurHash::update(hash, configs->hashCode());
hash = misc::MurmurHash::finish(hash, 1);
return hash;
}
bool DFAState::operator==(const DFAState& o) const {
// compare set of ATN configurations in this set with other
if (this == &o) {
return true;
}
return *configs == *o.configs;
}
std::string DFAState::toString() {
std::stringstream ss;
ss << stateNumber;
if (configs) {
ss << ":" << configs->toString();
}
if (isAcceptState) {
ss << " => ";
if (!predicates.empty()) {
for (size_t i = 0; i < predicates.size(); i++) {
ss << predicates[i]->toString();
}
} else {
ss << prediction;
}
}
return ss.str();
}
void DFAState::InitializeInstanceFields() {
stateNumber = -1;
isAcceptState = false;
prediction = 0;
requiresFullContext = false;
}
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