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127 lines
4.3 KiB
C++
127 lines
4.3 KiB
C++
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// Copyright (c) 2020-2022 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_CONTRIB_PREDICATES_HPP
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#define TAO_PEGTL_CONTRIB_PREDICATES_HPP
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#include "../config.hpp"
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#include "../type_list.hpp"
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#include "../internal/bump_help.hpp"
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#include "../internal/dependent_false.hpp"
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#include "../internal/enable_control.hpp"
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#include "../internal/failure.hpp"
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#include "../internal/peek_char.hpp"
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#include "../internal/peek_utf8.hpp"
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#include "analyze_traits.hpp"
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namespace TAO_PEGTL_NAMESPACE
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{
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namespace internal
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{
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template< typename Peek, typename... Ps >
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struct predicates_and_test
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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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[[nodiscard]] static constexpr bool test( const data_t c ) noexcept
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{
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return ( Ps::test( c ) && ... ); // TODO: Static assert that Ps::peek_t is the same as peek_t?!
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}
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};
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template< typename Peek, typename P >
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struct predicate_not_test
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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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[[nodiscard]] static constexpr bool test( const data_t c ) noexcept
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{
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return !P::test( c ); // TODO: Static assert that P::peek_t is the same as peek_t?!
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}
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};
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template< typename Peek, typename... Ps >
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struct predicates_or_test
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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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[[nodiscard]] static constexpr bool test( const data_t c ) noexcept
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{
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return ( Ps::test( c ) || ... ); // TODO: Static assert that Ps::peek_t is the same as peek_t?!
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}
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};
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template< template< typename, typename... > class Test, typename Peek, typename... Ps >
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struct predicates
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: private Test< Peek, Ps... >
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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 = predicates;
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using subs_t = empty_list;
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using base_t = Test< Peek, Ps... >;
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using base_t::test;
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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< predicates >( 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< template< typename, typename... > class Test, typename Peek >
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struct predicates< Test, Peek >
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{
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static_assert( dependent_false< Peek >, "Empty predicate list is not allowed!" );
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};
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template< template< typename, typename... > class Test, typename Peek, typename... Ps >
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inline constexpr bool enable_control< predicates< Test, Peek, Ps... > > = false;
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} // namespace internal
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inline namespace ascii
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{
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// clang-format off
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template< typename... Ps > struct predicates_and : internal::predicates< internal::predicates_and_test, internal::peek_char, Ps... > {};
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template< typename P > struct predicate_not : internal::predicates< internal::predicate_not_test, internal::peek_char, P > {};
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template< typename... Ps > struct predicates_or : internal::predicates< internal::predicates_or_test, internal::peek_char, Ps... > {};
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// clang-format on
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} // namespace ascii
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namespace utf8
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{
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// clang-format off
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template< typename... Ps > struct predicates_and : internal::predicates< internal::predicates_and_test, internal::peek_utf8, Ps... > {};
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template< typename P > struct predicate_not : internal::predicates< internal::predicate_not_test, internal::peek_utf8, P > {};
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template< typename... Ps > struct predicates_or : internal::predicates< internal::predicates_or_test, internal::peek_utf8, Ps... > {};
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// clang-format on
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} // namespace utf8
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template< typename Name, template< typename, typename... > class Test, typename Peek, typename... Ps >
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struct analyze_traits< Name, internal::predicates< Test, Peek, Ps... > >
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: analyze_any_traits<>
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{};
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} // namespace TAO_PEGTL_NAMESPACE
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#endif
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