build(antlr): 引入第三方 ANTLR4 runtime/tool 并接入构建

third_party/antlr4-runtime-4.13.2/runtime/src/atn/PredicateTransition.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/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