First commit

runtime-linux/antlr4-runtime/dfa/DFAState.cpp

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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/ATNConfigSet.h"
+#include "atn/SemanticContext.h"
+#include "atn/ATNConfig.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;
+}