encoding.h

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#pragma once
#include <string>
#include <string_view>
#include <memory>
#ifdef WEBCFACE_MESON
#include "webcface-config.h"
#else
#include "webcface/common/webcface-config.h"
#endif
 
WEBCFACE_NS_BEGIN
namespace internal {
struct SharedStringData;
} // namespace internal
 
WEBCFACE_DLL void WEBCFACE_CALL usingUTF8(bool flag);
WEBCFACE_DLL bool WEBCFACE_CALL usingUTF8();
 
WEBCFACE_DLL std::wstring WEBCFACE_CALL toWide(std::string_view name_ref);
WEBCFACE_DLL std::string WEBCFACE_CALL toNarrow(std::wstring_view name_ref);
 
inline constexpr char field_separator = '.';
inline constexpr std::string_view field_separator_sv = ".";
inline constexpr char field_separator_alt = '/';
inline constexpr std::string_view field_separator_alt_sv = "/";
 
template <typename CharT>
class TStringView : public std::basic_string_view<CharT> {
    std::shared_ptr<const internal::SharedStringData> s_data;
 
    static inline CharT empty_buf[1] = {0};
 
  public:
    TStringView() : std::basic_string_view<CharT>(empty_buf, 0) {}
 
    TStringView(const CharT *data, std::size_t size,
                std::shared_ptr<const internal::SharedStringData> s_data)
        : std::basic_string_view<CharT>(data, size), s_data(std::move(s_data)) {
    }
    const CharT *c_str() const { return this->data(); }
 
    operator const CharT *() const { return this->data(); }
 
    template <typename T,
              std::enable_if_t<
                  std::is_convertible_v<T, std::basic_string_view<CharT>>,
                  std::nullptr_t> = nullptr>
    bool operator==(const T &other) const {
        return static_cast<std::basic_string_view<CharT>>(*this) ==
               std::basic_string_view<CharT>(other);
    }
    template <typename T,
              std::enable_if_t<
                  std::is_convertible_v<T, std::basic_string_view<CharT>>,
                  std::nullptr_t> = nullptr>
    bool operator!=(const T &other) const {
        return static_cast<std::basic_string_view<CharT>>(*this) !=
               std::basic_string_view<CharT>(other);
    }
    template <typename T,
              std::enable_if_t<
                  std::is_convertible_v<T, std::basic_string_view<CharT>>,
                  std::nullptr_t> = nullptr>
    bool operator<=(const T &other) const {
        return static_cast<std::basic_string_view<CharT>>(*this) <=
               std::basic_string_view<CharT>(other);
    }
    template <typename T,
              std::enable_if_t<
                  std::is_convertible_v<T, std::basic_string_view<CharT>>,
                  std::nullptr_t> = nullptr>
    bool operator>=(const T &other) const {
        return static_cast<std::basic_string_view<CharT>>(*this) >=
               std::basic_string_view<CharT>(other);
    }
    template <typename T,
              std::enable_if_t<
                  std::is_convertible_v<T, std::basic_string_view<CharT>>,
                  std::nullptr_t> = nullptr>
    bool operator<(const T &other) const {
        return static_cast<std::basic_string_view<CharT>>(*this) <
               std::basic_string_view<CharT>(other);
    }
    template <typename T,
              std::enable_if_t<
                  std::is_convertible_v<T, std::basic_string_view<CharT>>,
                  std::nullptr_t> = nullptr>
    bool operator>(const T &other) const {
        return static_cast<std::basic_string_view<CharT>>(*this) >
               std::basic_string_view<CharT>(other);
    }
};
 
using StringView = TStringView<char>;
using WStringView = TStringView<wchar_t>;
 
class WEBCFACE_DLL SharedString {
    std::shared_ptr<internal::SharedStringData> data;
 
  public:
    SharedString() : data() {}
    SharedString(std::nullptr_t) : data() {}
    explicit SharedString(std::shared_ptr<internal::SharedStringData> data);
 
    static SharedString WEBCFACE_CALL fromU8String(std::string u8s);
    static SharedString WEBCFACE_CALL fromU8StringStatic(std::string_view u8s);
    static SharedString WEBCFACE_CALL encode(std::string s);
    static SharedString WEBCFACE_CALL encodeStatic(std::string_view s);
    static SharedString WEBCFACE_CALL encode(std::wstring ws);
    static SharedString WEBCFACE_CALL encodeStatic(std::wstring_view ws);
 
    std::string_view u8StringView() const;
    StringView u8StringViewShare() const;
    std::string_view decode() const;
    StringView decodeShare() const;
    std::wstring_view decodeW() const;
    WStringView decodeShareW() const;
 
    static const std::string &emptyStr();
    static const std::wstring &emptyStrW();
 
    bool empty() const;
    bool startsWith(std::string_view str) const;
    bool startsWith(char str) const;
    SharedString substr(std::size_t pos,
                        std::size_t len = std::string::npos) const;
    std::size_t find(char c, std::size_t pos = 0) const;
 
    SharedString &normalizeSeparator();
 
    bool operator==(const SharedString &other) const;
    bool operator<=(const SharedString &other) const;
    bool operator>=(const SharedString &other) const;
    bool operator!=(const SharedString &other) const {
        return !(*this == other);
    }
    bool operator<(const SharedString &other) const {
        return !(*this >= other);
    }
    bool operator>(const SharedString &other) const {
        return !(*this <= other);
    }
};
 
class StringInitializer : public SharedString {
  public:
    StringInitializer() : SharedString() {}
    // move
    StringInitializer(std::string &&s)
        : SharedString(SharedString::encode(std::move(s))) {}
    StringInitializer(std::wstring &&s)
        : SharedString(SharedString::encode(std::move(s))) {}
    // copy
    template <typename T,
              typename std::enable_if_t<
                  std::conjunction_v<std::negation<std::is_void<T>>,
                                     std::is_constructible<std::string, T>>,
                  std::nullptr_t> = nullptr>
    StringInitializer(const T &s)
        : SharedString(SharedString::encode(std::string(s))) {}
    template <typename T,
              typename std::enable_if_t<
                  std::conjunction_v<
                      std::negation<std::is_void<T>>,
                      std::negation<std::is_constructible<std::string, T>>,
                      std::is_constructible<std::wstring, T>>,
                  std::nullptr_t> = nullptr>
    StringInitializer(const T &s)
        : SharedString(SharedString::encode(std::wstring(s))) {}
    // c-string ptr
    template <typename CharT, std::size_t N,
              typename std::enable_if_t<std::is_same_v<CharT, char> ||
                                            std::is_same_v<CharT, wchar_t>,
                                        std::nullptr_t> = nullptr>
    StringInitializer(const CharT (&static_str)[N])
        : SharedString(SharedString::encodeStatic(
              std::basic_string_view<CharT>(static_str, N - 1))) {}
};
 
template <typename CharT, typename... Args>
std::basic_string<CharT> strJoin(std::basic_string_view<CharT> first_str,
                                 Args &&...args) {
    std::basic_string<CharT> str;
    str.reserve(first_str.size() +
                (std::basic_string_view<CharT>(args).size() + ...));
    str.append(first_str);
    (str.append(std::basic_string_view<CharT>(args)), ...);
    return str;
}
 
WEBCFACE_NS_END