add antlr

lib/antlr4/include/dfa/DFASerializer.h

@@ -0,0 +1,32 @@
+/* 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 "Vocabulary.h"
+
+namespace antlr4 {
+namespace dfa {
+
+  /// A DFA walker that knows how to dump them to serialized strings.
+  class ANTLR4CPP_PUBLIC DFASerializer {
+  public:
+    DFASerializer(const DFA *dfa, const std::vector<std::string>& tnames);
+    DFASerializer(const DFA *dfa, const Vocabulary &vocabulary);
+    virtual ~DFASerializer();
+
+    virtual std::string toString() const;
+
+  protected:
+    virtual std::string getEdgeLabel(size_t i) const;
+    virtual std::string getStateString(DFAState *s) const;
+
+  private:
+    const DFA *_dfa;
+    const Vocabulary &_vocabulary;
+  };
+
+} // namespace atn
+} // namespace antlr4