83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
// Copyright (c) 2014-2021 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_INTERNAL_REP_MIN_MAX_HPP
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#define TAO_PEGTL_INTERNAL_REP_MIN_MAX_HPP
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#include <type_traits>
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#include "../config.hpp"
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#include "enable_control.hpp"
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#include "failure.hpp"
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#include "not_at.hpp"
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#include "seq.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< unsigned Min, unsigned Max, typename... Rules >
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struct rep_min_max
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: rep_min_max< Min, Max, seq< Rules... > >
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{
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static_assert( Min <= Max );
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};
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template< unsigned Min, unsigned Max >
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struct rep_min_max< Min, Max >
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: failure
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{
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static_assert( Min <= Max );
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};
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template< typename Rule >
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struct rep_min_max< 0, 0, Rule >
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: not_at< Rule >
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{};
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template< unsigned Min, unsigned Max, typename Rule >
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struct rep_min_max< Min, Max, Rule >
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{
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using rule_t = rep_min_max;
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using subs_t = type_list< Rule >;
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static_assert( Min <= Max );
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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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auto m = in.template mark< M >();
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using m_t = decltype( m );
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for( unsigned i = 0; i != Min; ++i ) {
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if( !Control< Rule >::template match< A, m_t::next_rewind_mode, Action, Control >( in, st... ) ) {
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return false;
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}
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}
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for( unsigned i = Min; i != Max; ++i ) {
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if( !Control< Rule >::template match< A, rewind_mode::required, Action, Control >( in, st... ) ) {
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return m( true );
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}
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}
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return m( Control< not_at< Rule > >::template match< A, m_t::next_rewind_mode, Action, Control >( in, st... ) ); // NOTE that not_at<> will always rewind.
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}
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};
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template< unsigned Min, unsigned Max, typename... Rules >
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inline constexpr bool enable_control< rep_min_max< Min, Max, Rules... > > = false;
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} // namespace TAO_PEGTL_NAMESPACE::internal
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#endif
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