add antlr

lib/antlr4/include/tree/xpath/XPathTokenElement.h

@@ -0,0 +1,26 @@
+/* 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 "XPathElement.h"
+
+namespace antlr4 {
+namespace tree {
+namespace xpath {
+
+  class ANTLR4CPP_PUBLIC XPathTokenElement : public XPathElement {
+  public:
+    XPathTokenElement(const std::string &tokenName, size_t tokenType);
+
+    virtual std::vector<ParseTree *> evaluate(ParseTree *t) override;
+
+  protected:
+    size_t _tokenType = 0;
+  };
+
+} // namespace xpath
+} // namespace tree
+} // namespace antlr4