64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
// Copyright (c) 2019-2021 Dr. Colin Hirsch and Daniel Frey
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
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#ifndef TAO_PEGTL_CHANGE_ACTION_AND_STATES_HPP
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#define TAO_PEGTL_CHANGE_ACTION_AND_STATES_HPP
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#include <tuple>
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#include <utility>
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#include "apply_mode.hpp"
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#include "config.hpp"
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#include "match.hpp"
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#include "nothing.hpp"
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#include "rewind_mode.hpp"
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namespace TAO_PEGTL_NAMESPACE
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{
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template< template< typename... > class NewAction, typename... NewStates >
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struct change_action_and_states
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: maybe_nothing
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{
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template< typename Rule,
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apply_mode A,
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rewind_mode M,
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template< typename... >
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class Action,
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template< typename... >
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class Control,
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std::size_t... Ns,
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typename ParseInput,
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typename... States >
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[[nodiscard]] static bool match( std::index_sequence< Ns... > /*unused*/, ParseInput& in, States&&... st )
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{
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auto t = std::tie( st... );
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if( Control< Rule >::template match< A, M, NewAction, Control >( in, std::get< Ns >( t )... ) ) {
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if constexpr( A == apply_mode::action ) {
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Action< Rule >::success( static_cast< const ParseInput& >( in ), st... );
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}
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return true;
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}
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return false;
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}
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template< typename Rule,
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apply_mode A,
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rewind_mode M,
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template< typename... >
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class Action,
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template< typename... >
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class Control,
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typename ParseInput,
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typename... States >
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[[nodiscard]] static bool match( ParseInput& in, States&&... st )
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{
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static_assert( !std::is_same_v< Action< void >, NewAction< void > >, "old and new action class templates are identical" );
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return match< Rule, A, M, Action, Control >( std::index_sequence_for< NewStates... >(), in, NewStates()..., st... );
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}
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};
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} // namespace TAO_PEGTL_NAMESPACE
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#endif
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