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runtime-linux/antlr4-runtime/atn/EmptyPredictionContext.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/EmptyPredictionContext.h"
+
+using namespace antlr4::atn;
+
+EmptyPredictionContext::EmptyPredictionContext() : SingletonPredictionContext(nullptr, EMPTY_RETURN_STATE) {
+}
+
+bool EmptyPredictionContext::isEmpty() const {
+  return true;
+}
+
+size_t EmptyPredictionContext::size() const {
+  return 1;
+}
+
+Ref<PredictionContext> EmptyPredictionContext::getParent(size_t /*index*/) const {
+  return nullptr;
+}
+
+size_t EmptyPredictionContext::getReturnState(size_t /*index*/) const {
+  return returnState;
+}
+
+bool EmptyPredictionContext::operator == (const PredictionContext &o) const {
+  return this == &o;
+}
+
+std::string EmptyPredictionContext::toString() const {
+  return "$";
+}