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91 lines
2.5 KiB
C++
91 lines
2.5 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_RANGES_HPP
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#define TAO_PEGTL_INTERNAL_RANGES_HPP
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#include "../config.hpp"
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#include <utility>
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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 "one.hpp"
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#include "range.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< typename Char, Char Lo, Char Hi >
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constexpr bool validate_range( Char c ) noexcept
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{
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static_assert( Lo <= Hi, "invalid range" );
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return ( Lo <= c ) && ( c <= Hi );
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}
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template< typename Peek, typename Peek::data_t... Cs >
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struct ranges
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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 = ranges;
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using subs_t = empty_list;
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template< std::size_t... Is >
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[[nodiscard]] static constexpr bool test( std::index_sequence< Is... > /*unused*/, const data_t c ) noexcept
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{
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constexpr const data_t cs[] = { Cs... };
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if constexpr( sizeof...( Cs ) % 2 == 0 ) {
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return ( validate_range< data_t, cs[ 2 * Is ], cs[ 2 * Is + 1 ] >( c ) || ... );
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}
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else {
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return ( validate_range< data_t, cs[ 2 * Is ], cs[ 2 * Is + 1 ] >( c ) || ... ) || ( c == cs[ sizeof...( Cs ) - 1 ] );
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}
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}
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[[nodiscard]] static constexpr bool test( const data_t c ) noexcept
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{
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return test( std::make_index_sequence< sizeof...( Cs ) / 2 >(), c );
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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< ranges >( 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, typename Peek::data_t Lo, typename Peek::data_t Hi >
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struct ranges< Peek, Lo, Hi >
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: range< result_on_found::success, Peek, Lo, Hi >
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{};
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template< typename Peek, typename Peek::data_t C >
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struct ranges< Peek, C >
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: one< result_on_found::success, Peek, C >
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{};
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template< typename Peek >
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struct ranges< Peek >
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: failure
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{};
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template< typename Peek, typename Peek::data_t... Cs >
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inline constexpr bool enable_control< ranges< Peek, Cs... > > = false;
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} // namespace TAO_PEGTL_NAMESPACE::internal
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#endif
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