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91 lines
3.6 KiB
C++
91 lines
3.6 KiB
C++
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// Copyright (c) 2015-2022 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_PEGTL_STRING_HPP
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#define TAO_PEGTL_INTERNAL_PEGTL_STRING_HPP
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#include <cstddef>
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#include <type_traits>
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#include "../ascii.hpp"
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#include "../config.hpp"
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namespace TAO_PEGTL_NAMESPACE::internal
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{
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// Inspired by https://github.com/irrequietus/typestring
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// Rewritten and reduced to what is needed for the PEGTL
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// and to work with Visual Studio 2015.
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template< typename, typename, typename, typename, typename, typename, typename, typename >
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struct string_join;
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template< template< char... > class S, char... C0s, char... C1s, char... C2s, char... C3s, char... C4s, char... C5s, char... C6s, char... C7s >
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struct string_join< S< C0s... >, S< C1s... >, S< C2s... >, S< C3s... >, S< C4s... >, S< C5s... >, S< C6s... >, S< C7s... > >
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{
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using type = S< C0s..., C1s..., C2s..., C3s..., C4s..., C5s..., C6s..., C7s... >;
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};
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template< template< char... > class S, char, bool >
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struct string_at
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{
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using type = S<>;
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};
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template< template< char... > class S, char C >
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struct string_at< S, C, true >
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{
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using type = S< C >;
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};
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template< typename T, std::size_t S >
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struct string_max_length
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{
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static_assert( S <= 512, "String longer than 512 (excluding terminating \\0)!" );
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using type = T;
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};
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} // namespace TAO_PEGTL_NAMESPACE::internal
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#define TAO_PEGTL_INTERNAL_EMPTY()
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#define TAO_PEGTL_INTERNAL_DEFER( X ) X TAO_PEGTL_INTERNAL_EMPTY()
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#define TAO_PEGTL_INTERNAL_EXPAND( ... ) __VA_ARGS__
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#define TAO_PEGTL_INTERNAL_STRING_AT( S, x, n ) \
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TAO_PEGTL_NAMESPACE::internal::string_at< S, ( 0##n < ( sizeof( x ) / sizeof( char ) ) ) ? ( x )[ 0##n ] : 0, ( 0##n < ( sizeof( x ) / sizeof( char ) ) - 1 ) >::type
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#define TAO_PEGTL_INTERNAL_JOIN_8( M, S, x, n ) \
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TAO_PEGTL_NAMESPACE::internal::string_join< TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##0 ), \
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TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##1 ), \
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TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##2 ), \
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TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##3 ), \
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TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##4 ), \
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TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##5 ), \
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TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##6 ), \
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TAO_PEGTL_INTERNAL_DEFER( M )( S, x, n##7 ) >::type
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#define TAO_PEGTL_INTERNAL_STRING_8( S, x, n ) \
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TAO_PEGTL_INTERNAL_JOIN_8( TAO_PEGTL_INTERNAL_STRING_AT, S, x, n )
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#define TAO_PEGTL_INTERNAL_STRING_64( S, x, n ) \
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TAO_PEGTL_INTERNAL_JOIN_8( TAO_PEGTL_INTERNAL_STRING_8, S, x, n )
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#define TAO_PEGTL_INTERNAL_STRING_512( S, x, n ) \
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TAO_PEGTL_INTERNAL_JOIN_8( TAO_PEGTL_INTERNAL_STRING_64, S, x, n )
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#define TAO_PEGTL_INTERNAL_STRING( S, x ) \
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TAO_PEGTL_INTERNAL_EXPAND( \
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TAO_PEGTL_INTERNAL_EXPAND( \
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TAO_PEGTL_INTERNAL_EXPAND( \
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TAO_PEGTL_NAMESPACE::internal::string_max_length< TAO_PEGTL_INTERNAL_STRING_512( S, x, ), sizeof( x ) - 1 >::type ) ) )
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#define TAO_PEGTL_STRING( x ) \
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TAO_PEGTL_INTERNAL_STRING( TAO_PEGTL_NAMESPACE::ascii::string, x )
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#define TAO_PEGTL_ISTRING( x ) \
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TAO_PEGTL_INTERNAL_STRING( TAO_PEGTL_NAMESPACE::ascii::istring, x )
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#define TAO_PEGTL_KEYWORD( x ) \
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TAO_PEGTL_INTERNAL_STRING( TAO_PEGTL_NAMESPACE::ascii::keyword, x )
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#endif
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