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runtime-linux/antlr4-runtime/atn/ATNState.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/ATN.h"
+#include "atn/Transition.h"
+#include "misc/IntervalSet.h"
+#include "support/CPPUtils.h"
+
+#include "atn/ATNState.h"
+
+using namespace antlr4::atn;
+using namespace antlrcpp;
+
+ATNState::ATNState() {
+}
+
+ATNState::~ATNState() {
+  for (auto transition : transitions) {
+    delete transition;
+  }
+}
+
+const std::vector<std::string> ATNState::serializationNames = {
+  "INVALID", "BASIC", "RULE_START", "BLOCK_START",
+  "PLUS_BLOCK_START", "STAR_BLOCK_START", "TOKEN_START", "RULE_STOP",
+  "BLOCK_END", "STAR_LOOP_BACK", "STAR_LOOP_ENTRY", "PLUS_LOOP_BACK", "LOOP_END"
+};
+
+size_t ATNState::hashCode() {
+  return stateNumber;
+}
+
+bool ATNState::operator == (const ATNState &other) {
+  return stateNumber == other.stateNumber;
+}
+
+bool ATNState::isNonGreedyExitState() {
+  return false;
+}
+
+std::string ATNState::toString() const {
+  return std::to_string(stateNumber);
+}
+
+void ATNState::addTransition(Transition *e) {
+  addTransition(transitions.size(), e);
+}
+
+void ATNState::addTransition(size_t index, Transition *e) {
+  for (Transition *transition : transitions)
+    if (transition->target->stateNumber == e->target->stateNumber) {
+      delete e;
+      return;
+    }
+
+  if (transitions.empty()) {
+    epsilonOnlyTransitions = e->isEpsilon();
+  } else if (epsilonOnlyTransitions != e->isEpsilon()) {
+    std::cerr << "ATN state %d has both epsilon and non-epsilon transitions.\n" << stateNumber;
+    epsilonOnlyTransitions = false;
+  }
+
+  transitions.insert(transitions.begin() + index, e);
+}
+
+Transition *ATNState::removeTransition(size_t index) {
+  transitions.erase(transitions.begin() + index);
+  return nullptr;
+}