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81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
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// Copyright (c) 2020-2022 Dr. Colin Hirsch and Daniel Frey
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// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
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#ifndef TAO_PEGTL_VISIT_HPP
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#define TAO_PEGTL_VISIT_HPP
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#include <type_traits>
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#include "config.hpp"
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#include "type_list.hpp"
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namespace TAO_PEGTL_NAMESPACE
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{
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namespace internal
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{
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template< typename Type, typename... Types >
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inline constexpr bool contains_v = ( std::is_same_v< Type, Types > || ... );
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template< typename Type, typename... Types >
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struct contains
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: std::bool_constant< contains_v< Type, Types... > >
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{};
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template< typename Type, typename... Types >
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struct contains< Type, type_list< Types... > >
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: contains< Type, Types... >
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{};
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template< typename Rules, typename Todo, typename Done >
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struct filter
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{
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using type = Todo;
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};
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template< typename Rule, typename... Rules, typename... Todo, typename... Done >
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struct filter< type_list< Rule, Rules... >, type_list< Todo... >, type_list< Done... > >
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: filter< type_list< Rules... >, std::conditional_t< contains_v< Rule, Todo..., Done... >, type_list< Todo... >, type_list< Rule, Todo... > >, type_list< Done... > >
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{};
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template< typename Rules, typename Todo, typename Done >
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using filter_t = typename filter< Rules, Todo, Done >::type;
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template< typename Done, typename... Rules >
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struct visit_list
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{
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using NextDone = type_list_concat_t< type_list< Rules... >, Done >;
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using NextSubs = type_list_concat_t< typename Rules::subs_t... >;
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using NextTodo = filter_t< NextSubs, empty_list, NextDone >;
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using type = typename std::conditional_t< std::is_same_v< NextTodo, empty_list >, type_list_concat< NextDone >, visit_list< NextDone, NextTodo > >::type;
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};
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template< typename Done, typename... Rules >
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struct visit_list< Done, type_list< Rules... > >
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: visit_list< Done, Rules... >
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{};
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template< template< typename... > class Func, typename... Args, typename... Rules >
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void visit( type_list< Rules... > /*unused*/, Args&&... args )
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{
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( Func< Rules >::visit( args... ), ... );
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}
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} // namespace internal
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template< typename Grammar >
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using rule_list_t = typename internal::visit_list< empty_list, Grammar >::type;
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template< typename Grammar, typename Rule >
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inline constexpr bool contains_v = internal::contains< Rule, rule_list_t< Grammar > >::value;
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template< typename Rule, template< typename... > class Func, typename... Args >
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void visit( Args&&... args )
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{
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internal::visit< Func >( rule_list_t< Rule >(), args... );
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}
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} // namespace TAO_PEGTL_NAMESPACE
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#endif
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