51 lines
1.6 KiB
C++
Executable File
51 lines
1.6 KiB
C++
Executable File
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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* Use of this file is governed by the BSD 3-clause license that
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* can be found in the LICENSE.txt file in the project root.
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*/
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#pragma once
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#include "atn/Transition.h"
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#include "atn/SemanticContext.h"
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namespace antlr4 {
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namespace atn {
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/// TODO: this is old comment:
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/// A tree of semantic predicates from the grammar AST if label==SEMPRED.
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/// In the ATN, labels will always be exactly one predicate, but the DFA
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/// may have to combine a bunch of them as it collects predicates from
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/// multiple ATN configurations into a single DFA state.
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class ANTLR4CPP_PUBLIC PredicateTransition final : public Transition {
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public:
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static bool is(const Transition &transition) { return transition.getTransitionType() == TransitionType::PREDICATE; }
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static bool is(const Transition *transition) { return transition != nullptr && is(*transition); }
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PredicateTransition(ATNState *target, size_t ruleIndex, size_t predIndex, bool isCtxDependent);
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size_t getRuleIndex() const {
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return _predicate->ruleIndex;
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}
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size_t getPredIndex() const {
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return _predicate->predIndex;
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}
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bool isCtxDependent() const {
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return _predicate->isCtxDependent;
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}
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bool isEpsilon() const override;
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bool matches(size_t symbol, size_t minVocabSymbol, size_t maxVocabSymbol) const override;
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std::string toString() const override;
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const Ref<const SemanticContext::Predicate>& getPredicate() const { return _predicate; }
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private:
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const std::shared_ptr<const SemanticContext::Predicate> _predicate;
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};
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} // namespace atn
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} // namespace antlr4
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