add antlr

lib/antlr4/include/atn/ArrayPredictionContext.h

@@ -0,0 +1,43 @@
+
+/* 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 : public PredictionContext {
+  public:
+    /// 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.
+    const std::vector<Ref<PredictionContext>> parents;
+
+    /// Sorted for merge, no duplicates; if present, EMPTY_RETURN_STATE is always last.
+    const std::vector<size_t> returnStates;
+
+    ArrayPredictionContext(Ref<SingletonPredictionContext> const& a);
+    ArrayPredictionContext(std::vector<Ref<PredictionContext>> const& parents_, std::vector<size_t> const& returnStates);
+    virtual ~ArrayPredictionContext();
+
+    virtual bool isEmpty() const override;
+    virtual size_t size() const override;
+    virtual Ref<PredictionContext> getParent(size_t index) const override;
+    virtual size_t getReturnState(size_t index) const override;
+    bool operator == (const PredictionContext &o) const override;
+
+    virtual std::string toString() const override;
+  };
+
+} // namespace atn
+} // namespace antlr4
+