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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"
#include "atn/SemanticContext.h"
namespace antlr4 {
namespace atn {
/// TODO: this is old comment:
/// A tree of semantic predicates from the grammar AST if label==SEMPRED.
/// In the ATN, labels will always be exactly one predicate, but the DFA
/// may have to combine a bunch of them as it collects predicates from
/// multiple ATN configurations into a single DFA state.
class ANTLR4CPP_PUBLIC PredicateTransition final : public Transition {
public:
static bool is(const Transition &transition) { return transition.getTransitionType() == TransitionType::PREDICATE; }
static bool is(const Transition *transition) { return transition != nullptr && is(*transition); }
PredicateTransition(ATNState *target, size_t ruleIndex, size_t predIndex, bool isCtxDependent);
size_t getRuleIndex() const {
return _predicate->ruleIndex;
}
size_t getPredIndex() const {
return _predicate->predIndex;
}
bool isCtxDependent() const {
return _predicate->isCtxDependent;
}
bool isEpsilon() const override;
bool matches(size_t symbol, size_t minVocabSymbol, size_t maxVocabSymbol) const override;
std::string toString() const override;
const Ref<const SemanticContext::Predicate>& getPredicate() const { return _predicate; }
private:
const std::shared_ptr<const SemanticContext::Predicate> _predicate;
};
} // namespace atn
} // namespace antlr4
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