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67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
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// Copyright (c) 2014-2022 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_INTERNAL_ONE_HPP
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#define TAO_PEGTL_INTERNAL_ONE_HPP
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#include <cstddef>
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#include "../config.hpp"
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#include "any.hpp"
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#include "bump_help.hpp"
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#include "enable_control.hpp"
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#include "failure.hpp"
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#include "result_on_found.hpp"
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#include "../type_list.hpp"
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namespace TAO_PEGTL_NAMESPACE::internal
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{
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template< result_on_found R, typename Peek, typename Peek::data_t... Cs >
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struct one
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{
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using peek_t = Peek;
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using data_t = typename Peek::data_t;
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using rule_t = one;
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using subs_t = empty_list;
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[[nodiscard]] static constexpr bool test( const data_t c ) noexcept
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{
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return ( ( c == Cs ) || ... ) == bool( R );
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}
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template< int Eol >
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static constexpr bool can_match_eol = test( Eol );
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template< typename ParseInput >
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[[nodiscard]] static bool match( ParseInput& in ) noexcept( noexcept( Peek::peek( in ) ) )
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{
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if( const auto t = Peek::peek( in ) ) {
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if( test( t.data ) ) {
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bump_help< one >( in, t.size );
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return true;
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}
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}
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return false;
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}
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};
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template< typename Peek >
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struct one< result_on_found::success, Peek >
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: failure
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{};
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template< typename Peek >
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struct one< result_on_found::failure, Peek >
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: any< Peek >
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{};
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template< result_on_found R, typename Peek, typename Peek::data_t... Cs >
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inline constexpr bool enable_control< one< R, Peek, Cs... > > = false;
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} // namespace TAO_PEGTL_NAMESPACE::internal
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#endif
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