/* 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