UnicodeViewer.hpp

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#pragma once
#include <Thoth/String/_base.hpp>
#include <string>
 
namespace Thoth::String {
    using Rune = char32_t;
 
    constexpr Rune UnknownChar{ U'\uFFFD' };
 
 
    template<UnicodeCharConcept CharT>
    struct UnicodeViewer {
        using  StringViewType = std::basic_string_view<CharT>;
 
        constexpr explicit UnicodeViewer(StringViewType str) : _ref{ str } { }
 
 
        struct Iterator {
            using iterator_category = std::output_iterator_tag;
            using value_type = Rune;
            using difference_type = std::ptrdiff_t;
 
            constexpr Iterator() = default;
            constexpr explicit Iterator(StringViewType::const_iterator it, StringViewType::const_iterator end);
 
            [[nodiscard]] constexpr value_type operator*() const;
            [[nodiscard]] constexpr bool operator==(std::default_sentinel_t) const;
            constexpr Iterator& operator++();
            constexpr Iterator operator++(int);
 
        private:
            StringViewType::const_iterator _curIt{};
            StringViewType::const_iterator _end{};
            size_t _accInvalid{};
            value_type _currValue{};
        };
 
        [[nodiscard]] constexpr Iterator begin() noexcept{        return Iterator{ _ref.begin(), _ref.end() }; }
        [[nodiscard]] constexpr Iterator cbegin() const noexcept{ return Iterator{ _ref.begin(), _ref.end() }; }
        [[nodiscard]] constexpr std::default_sentinel_t end() noexcept{        return std::default_sentinel_t{}; }
        [[nodiscard]] constexpr std::default_sentinel_t cend() const noexcept{ return std::default_sentinel_t{}; }
 
        [[nodiscard]] static constexpr bool IsValid(StringViewType str);
 
        template<UnicodeCharConcept NewCharT>
        static constexpr std::basic_string<NewCharT> ConvertTo(StringViewType str);
    private:
        StringViewType _ref{};
    };
 
    using Utf8View  = UnicodeViewer<char8_t>;
    using Utf16View = UnicodeViewer<char16_t>;
    using Utf32View = UnicodeViewer<char32_t>;
}
 
 
#include <Thoth/String/UnicodeViewer.tpp>