add antlr

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

@@ -0,0 +1,40 @@
+/* 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 "antlr4-common.h"
+
+namespace antlr4 {
+namespace tree {
+  class ParseTree;
+
+namespace xpath {
+
+  class ANTLR4CPP_PUBLIC XPathElement {
+  public:
+    /// Construct element like {@code /ID} or {@code ID} or {@code /*} etc...
+    ///  op is null if just node
+    XPathElement(const std::string &nodeName);
+    XPathElement(XPathElement const&) = default;
+    virtual ~XPathElement();
+
+    XPathElement& operator=(XPathElement const&) = default;
+
+    /// Given tree rooted at {@code t} return all nodes matched by this path
+    /// element.
+    virtual std::vector<ParseTree *> evaluate(ParseTree *t);
+    virtual std::string toString() const;
+
+    void setInvert(bool value);
+
+  protected:
+    std::string _nodeName;
+    bool _invert = false;
+  };
+
+} // namespace xpath
+} // namespace tree
+} // namespace antlr4