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53 lines
1.5 KiB
C++
53 lines
1.5 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_IF_MUST_HPP
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#define TAO_PEGTL_INTERNAL_IF_MUST_HPP
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#if !defined( __cpp_exceptions )
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#error "Exception support required for tao/pegtl/internal/if_must.hpp"
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#else
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#include "../config.hpp"
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#include "enable_control.hpp"
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#include "must.hpp"
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#include "../apply_mode.hpp"
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#include "../rewind_mode.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< bool Default, typename Cond, typename... Rules >
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struct if_must
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{
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using rule_t = if_must;
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using subs_t = type_list< Cond, must< Rules... > >;
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template< 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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if( Control< Cond >::template match< A, M, Action, Control >( in, st... ) ) {
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(void)Control< must< Rules... > >::template match< A, M, Action, Control >( in, st... );
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return true;
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}
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return Default;
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}
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};
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template< bool Default, typename Cond, typename... Rules >
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inline constexpr bool enable_control< if_must< Default, Cond, Rules... > > = false;
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} // namespace TAO_PEGTL_NAMESPACE::internal
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#endif
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#endif
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