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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/Transition.h"
namespace antlr4 {
namespace atn {
class ANTLR4CPP_PUBLIC EpsilonTransition final : public Transition {
public:
static bool is(const Transition &transition) { return transition.getTransitionType() == TransitionType::EPSILON; }
static bool is(const Transition *transition) { return transition != nullptr && is(*transition); }
explicit EpsilonTransition(ATNState *target);
EpsilonTransition(ATNState *target, size_t outermostPrecedenceReturn);
/**
* @return the rule index of a precedence rule for which this transition is
* returning from, where the precedence value is 0; otherwise, INVALID_INDEX.
*
* @see ATNConfig#isPrecedenceFilterSuppressed()
* @see ParserATNSimulator#applyPrecedenceFilter(ATNConfigSet)
* @since 4.4.1
*/
size_t outermostPrecedenceReturn() const;
virtual bool isEpsilon() const override;
virtual bool matches(size_t symbol, size_t minVocabSymbol, size_t maxVocabSymbol) const override;
virtual std::string toString() const override;
private:
const size_t _outermostPrecedenceReturn; // A rule index.
};
} // namespace atn
} // namespace antlr4
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