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70 lines
1.8 KiB
C++
70 lines
1.8 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_MUST_HPP
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#define TAO_PEGTL_INTERNAL_MUST_HPP
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#if !defined( __cpp_exceptions )
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#error "Exception support required for tao/pegtl/internal/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 "seq.hpp"
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#include "success.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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// The general case applies must<> to each of the
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// rules in the 'Rules' parameter pack individually.
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template< typename... Rules >
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struct must
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: seq< must< Rules >... >
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{};
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template<>
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struct must<>
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: success
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{};
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// While in theory the implementation for a single rule could
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// be simplified to must< Rule > = sor< Rule, raise< Rule > >, this
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// would result in some unnecessary run-time overhead.
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template< typename Rule >
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struct must< Rule >
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{
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using rule_t = must;
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using subs_t = type_list< Rule >;
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template< apply_mode A,
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rewind_mode,
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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< Rule >::template match< A, rewind_mode::dontcare, Action, Control >( in, st... ) ) {
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Control< Rule >::raise( static_cast< const ParseInput& >( in ), st... );
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}
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return true;
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}
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};
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template< typename... Rules >
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inline constexpr bool enable_control< must< 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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