Program Listing for File xpath.hpp

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/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2024 Maarten L. Hekkelman
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "mxml/node.hpp"

#include <memory>
#include <string>
#include <vector>

namespace mxml
{

// --------------------------------------------------------------------

class context final
{
  public:
    context();

    context(const context &ctxt)
        : m_impl(ctxt.m_impl)
    {
    }

    context(context &&ctxt)
    {
        std::swap(m_impl, ctxt.m_impl);
    }

    context &operator=(context ctxt)
    {
        std::swap(m_impl, ctxt.m_impl);
        return *this;
    }

    void set(std::string name, std::string value);

    void set(std::string name, double value);

    template <typename T>
        requires std::is_same_v<T, std::string> or std::is_same_v<T, double>
    T get(std::string name);

  private:
    friend class xpath;

    std::shared_ptr<struct context_imp> m_impl;
};

// --------------------------------------------------------------------

class xpath final
{
  public:
    xpath(std::string_view path);

    xpath(const xpath &rhs)
        : m_impl(rhs.m_impl)
    {
    }

    xpath(xpath &&rhs) noexcept
    {
        std::swap(m_impl, rhs.m_impl);
    }

    xpath &operator=(xpath xp)
    {
        std::swap(m_impl, xp.m_impl);
        return *this;
    }

    template <typename T>
    std::vector<T *> evaluate(const node &root, const context &ctxt = {}) const;

    bool matches(const node *n, const context &ctxt = {}) const;

  private:
    std::shared_ptr<class expression> m_impl;
};

} // namespace mxml