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Making matching tables compile-time constants
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,101 @@ | ||
| // Copyright (c) 2023, Eugene Gershnik | ||
| // SPDX-License-Identifier: GPL-3.0-or-later | ||
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| #ifndef TRANSLIT_HEADER_MAPPER_HPP_INCLUDED | ||
| #define TRANSLIT_HEADER_MAPPER_HPP_INCLUDED | ||
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| #include "MultiMatch.hpp" | ||
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| template<class T, class Char, size_t N> | ||
| struct Mapping { | ||
| const T dst; | ||
| const CTString<Char, N> src; | ||
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| constexpr Mapping(T c, const Char (&arr)[N + 1]) noexcept: | ||
| dst(c), | ||
| src(arr) | ||
| {} | ||
| }; | ||
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| template<class T, class Char, size_t N> | ||
| Mapping(T c, const Char (&arr)[N]) -> Mapping<T, Char, N - 1>; | ||
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| template<class T> | ||
| struct Value { | ||
| const T value; | ||
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| constexpr Value(T v) noexcept: | ||
| value(v) | ||
| {} | ||
| }; | ||
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| template<class Payload, class It> | ||
| struct PrefixMappingResult { | ||
| /** | ||
| End of match | ||
| If !payload always stays at the start of input | ||
| */ | ||
| It next; | ||
| /** The mapping of the match, if successful */ | ||
| std::optional<Payload> payload; | ||
| /** Whether the answer is definite and won't change with larger input */ | ||
| bool definite; | ||
| }; | ||
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| template<class Payload, std::ranges::forward_range Range> | ||
| constexpr auto nullPrefixMapper(const Range & range) { | ||
| return PrefixMappingResult<Payload, std::ranges::iterator_t<const Range>>{std::ranges::begin(range), std::nullopt, true}; | ||
| } | ||
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| template<std::ranges::forward_range Range, Mapping First, Mapping... Rest> | ||
| requires(SameCharType<First.src, Rest.src...> && | ||
| (std::is_same_v<decltype(First.dst), decltype(Rest.dst)> && ...) && | ||
| std::is_same_v<typename std::ranges::range_value_t<Range>, CharTypeOf<First.src>>) | ||
| constexpr auto makePrefixMapper() { | ||
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| using Payload = std::remove_const_t<decltype(First.dst)>; | ||
| using Char = CharTypeOf<First.src>; | ||
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| auto func = [](const Range & range) { | ||
| using Iterator = std::ranges::iterator_t<const Range>; | ||
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| static constexpr auto multiMatch = makeMultiMatch<First.src, Rest.src...>(); | ||
| static constexpr Payload mappings[1 + sizeof...(Rest)] = {First.dst, Rest.dst...}; | ||
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| auto res = prefixMatch(multiMatch, range); | ||
| if (res.index != multiMatch.noMatch) | ||
| return PrefixMappingResult<Payload, Iterator>{res.next, mappings[res.index], res.definite}; | ||
| return PrefixMappingResult<Payload, Iterator>{res.next, std::nullopt, res.definite}; | ||
| }; | ||
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| return func; | ||
| } | ||
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| template<std::ranges::forward_range Range, Value Default, Mapping First, Mapping... Rest> | ||
| requires(SameCharType<First.src, Rest.src...> && | ||
| std::is_same_v<decltype(Default.value), decltype(First.dst)> && | ||
| (std::is_same_v<decltype(First.dst), decltype(Rest.dst)> && ...) && | ||
| std::is_same_v<typename std::ranges::range_value_t<Range>, CharTypeOf<First.src>>) | ||
| constexpr auto makeMapper() { | ||
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| using Payload = std::remove_const_t<decltype(First.dst)>; | ||
| using Char = CharTypeOf<First.src>; | ||
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| auto func = [](const Range & range) { | ||
| using Iterator = std::ranges::iterator_t<const Range>; | ||
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| static constexpr auto multiMatch = makeMultiMatch<First.src, Rest.src...>(); | ||
| static constexpr Payload mappings[2 + sizeof...(Rest)] = {First.dst, Rest.dst..., Default.value}; | ||
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| auto res = match(multiMatch, range); | ||
| return mappings[res]; | ||
| }; | ||
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| return func; | ||
| } | ||
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| #endif | ||
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