add antlr

lib/antlr4/include/dfa/LexerDFASerializer.h

@@ -0,0 +1,23 @@
+/* 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 "dfa/DFASerializer.h"
+
+namespace antlr4 {
+namespace dfa {
+
+  class ANTLR4CPP_PUBLIC LexerDFASerializer : public DFASerializer {
+  public:
+    LexerDFASerializer(DFA *dfa);
+    virtual ~LexerDFASerializer();
+
+  protected:
+    virtual std::string getEdgeLabel(size_t i) const override;
+  };
+
+} // namespace atn
+} // namespace antlr4