add antlr

lib/antlr4/include/atn/DecisionState.h

@@ -0,0 +1,30 @@
+/* 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/ATNState.h"
+
+namespace antlr4 {
+namespace atn {
+
+  class ANTLR4CPP_PUBLIC DecisionState : public ATNState {
+  public:
+    int decision;
+    bool nonGreedy;
+
+  private:
+    void InitializeInstanceFields();
+
+  public:
+    DecisionState() {
+      InitializeInstanceFields();
+    }
+
+    virtual std::string toString() const override;
+  };
+
+} // namespace atn
+} // namespace antlr4