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authorvitalyisaev <vitalyisaev@ydb.tech>2023-11-30 13:26:22 +0300
committervitalyisaev <vitalyisaev@ydb.tech>2023-11-30 15:44:45 +0300
commit0a98fece5a9b54f16afeb3a94b3eb3105e9c3962 (patch)
tree291d72dbd7e9865399f668c84d11ed86fb190bbf /contrib/libs/antlr4_cpp_runtime/src/atn/SingletonPredictionContext.h
parentcb2c8d75065e5b3c47094067cb4aa407d4813298 (diff)
downloadydb-0a98fece5a9b54f16afeb3a94b3eb3105e9c3962.tar.gz
YQ Connector:Use docker-compose in integrational tests
Diffstat (limited to 'contrib/libs/antlr4_cpp_runtime/src/atn/SingletonPredictionContext.h')
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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.
+ */
+
+#pragma once
+
+#include "atn/PredictionContext.h"
+
+namespace antlr4 {
+namespace atn {
+
+ class ANTLR4CPP_PUBLIC SingletonPredictionContext final : public PredictionContext {
+ public:
+ static bool is(const PredictionContext &predictionContext) { return predictionContext.getContextType() == PredictionContextType::SINGLETON; }
+
+ static bool is(const PredictionContext *predictionContext) { return predictionContext != nullptr && is(*predictionContext); }
+
+ static Ref<const SingletonPredictionContext> create(Ref<const PredictionContext> parent, size_t returnState);
+
+ // Usually a parent is linked via a weak ptr. Not so here as we have kinda reverse reference chain.
+ // There are no child contexts stored here and often the parent context is left dangling when it's
+ // owning ATNState is released. In order to avoid having this context released as well (leaving all other contexts
+ // which got this one as parent with a null reference) we use a shared_ptr here instead, to keep those left alone
+ // parent contexts alive.
+ const Ref<const PredictionContext> parent;
+ const size_t returnState;
+
+ SingletonPredictionContext(Ref<const PredictionContext> parent, size_t returnState);
+
+ bool isEmpty() const override;
+ size_t size() const override;
+ const Ref<const PredictionContext>& getParent(size_t index) const override;
+ size_t getReturnState(size_t index) const override;
+ bool equals(const PredictionContext &other) const override;
+ std::string toString() const override;
+
+ protected:
+ size_t hashCodeImpl() const override;
+ };
+
+} // namespace atn
+} // namespace antlr4