transformer_func.h

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/*  Copyright (c) SILVERCODERS Ltd, http://silvercoders.com                                                                                  */
/*  Project homepage: https://github.com/docwire/docwire                                                                                     */
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/*  SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-DocWire-Commercial                                                                  */
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#ifndef DOCWIRE_TRANSFORMER_FUNC_H
#define DOCWIRE_TRANSFORMER_FUNC_H
 
#include "chain_element.h"
#include "core_export.h"
#include "parsing_chain.h"
#include "ref_or_owned.h"
 
namespace docwire
{
 
using message_transform_func = std::function<continuation(message_ptr, const message_callbacks& emit_message)>;
 
class DOCWIRE_CORE_EXPORT transformer_func : public chain_element, public with_pimpl<transformer_func>
{
public:
  transformer_func(message_transform_func transformer_function);
 
    virtual continuation operator()(message_ptr msg, const message_callbacks& emit_message) override;
 
  bool is_leaf() const override
  {
    return false;
  }
 
private:
  using with_pimpl<transformer_func>::impl;
  friend pimpl_impl<transformer_func>;
};
 
template <typename T>
requires (
  std::is_convertible_v<T, message_transform_func> &&
  !std::is_base_of_v<chain_element, std::remove_cvref_t<T>>
)
parsing_chain operator|(ref_or_owned<chain_element> element, T func)
{
  return element | transformer_func{func};
}
 
template <typename T>
requires (
  std::is_convertible_v<T, message_transform_func> &&
  !std::is_base_of_v<chain_element, std::remove_cvref_t<T>>
)
parsing_chain& operator|=(parsing_chain& chain, T func)
{
  return chain |= transformer_func{func};
}
 
} // namespace docwire
 
#endif //DOCWIRE_TRANSFORMER_FUNC_H