31 lines
1.5 KiB
C++
31 lines
1.5 KiB
C++
#ifndef CTRE__ACTIONS__BACKREFERENCE__HPP
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#define CTRE__ACTIONS__BACKREFERENCE__HPP
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// backreference with name
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template <auto... Str, auto V, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_back_reference, ctll::term<V>, pcre_context<ctll::list<id<Str...>, Ts...>, pcre_parameters<Counter>>) {
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return pcre_context{ctll::push_front(back_reference_with_name<id<Str...>>(), ctll::list<Ts...>()), pcre_parameters<Counter>()};
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}
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// with just a number
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template <auto V, size_t Id, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_back_reference, ctll::term<V>, pcre_context<ctll::list<number<Id>, Ts...>, pcre_parameters<Counter>>) {
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// if we are looking outside of existing list of Ids ... reject input during parsing
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if constexpr (Counter < Id) {
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return ctll::reject{};
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} else {
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return pcre_context{ctll::push_front(back_reference<Id>(), ctll::list<Ts...>()), pcre_parameters<Counter>()};
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}
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}
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// relative backreference
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template <auto V, size_t Id, typename... Ts, size_t Counter> static constexpr auto apply(pcre::make_relative_back_reference, ctll::term<V>, [[maybe_unused]] pcre_context<ctll::list<number<Id>, Ts...>, pcre_parameters<Counter>>) {
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// if we are looking outside of existing list of Ids ... reject input during parsing
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if constexpr (Counter < Id) {
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return ctll::reject{};
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} else {
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constexpr size_t absolute_id = (Counter + 1) - Id;
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return pcre_context{ctll::push_front(back_reference<absolute_id>(), ctll::list<Ts...>()), pcre_parameters<Counter>()};
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}
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}
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#endif
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