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// Copyright (c) 2019-2020 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAO_JSON_PEGTL_CHANGE_STATES_HPP
#define TAO_JSON_PEGTL_CHANGE_STATES_HPP
#include <tuple>
#include <utility>
#include "apply_mode.hpp"
#include "config.hpp"
#include "match.hpp"
#include "nothing.hpp"
#include "rewind_mode.hpp"
namespace TAO_JSON_PEGTL_NAMESPACE
{
template< typename... NewStates >
struct change_states
: maybe_nothing
{
template< typename Rule,
apply_mode A,
rewind_mode M,
template< typename... >
class Action,
template< typename... >
class Control,
std::size_t... Ns,
typename ParseInput,
typename... States >
[[nodiscard]] static bool match( std::index_sequence< Ns... > /*unused*/, ParseInput& in, States&&... st )
{
auto t = std::tie( st... );
if( TAO_JSON_PEGTL_NAMESPACE::match< Rule, A, M, Action, Control >( in, std::get< Ns >( t )... ) ) {
if constexpr( A == apply_mode::action ) {
Action< Rule >::success( static_cast< const ParseInput& >( in ), st... );
}
return true;
}
return false;
}
template< typename Rule,
apply_mode A,
rewind_mode M,
template< typename... >
class Action,
template< typename... >
class Control,
typename ParseInput,
typename... States >
[[nodiscard]] static bool match( ParseInput& in, States&&... st )
{
return match< Rule, A, M, Action, Control >( std::index_sequence_for< NewStates... >(), in, NewStates()..., st... );
}
};
} // namespace TAO_JSON_PEGTL_NAMESPACE
#endif
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