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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 SingletonPredictionContext;
class ANTLR4CPP_PUBLIC ArrayPredictionContext final : public PredictionContext {
public:
static bool is(const PredictionContext &predictionContext) { return predictionContext.getContextType() == PredictionContextType::ARRAY; }
static bool is(const PredictionContext *predictionContext) { return predictionContext != nullptr && is(*predictionContext); }
/// Parent can be empty only if full ctx mode and we make an array
/// from EMPTY and non-empty. We merge EMPTY by using null parent and
/// returnState == EMPTY_RETURN_STATE.
// Also here: we use a strong reference to our parents to avoid having them freed prematurely.
// See also SinglePredictionContext.
std::vector<Ref<const PredictionContext>> parents;
/// Sorted for merge, no duplicates; if present, EMPTY_RETURN_STATE is always last.
std::vector<size_t> returnStates;
explicit ArrayPredictionContext(const SingletonPredictionContext &predictionContext);
ArrayPredictionContext(std::vector<Ref<const PredictionContext>> parents, std::vector<size_t> returnStates);
ArrayPredictionContext(ArrayPredictionContext&&) = default;
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
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