ClickHouse/base/poco/Foundation/include/Poco/UnicodeConverter.h

//
// UnicodeConverter.h
//
// Library: Foundation
// Package: Text
// Module:  UnicodeConverter
//
// Definition of the UnicodeConverter class.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_UnicodeConverter_INCLUDED
#define Foundation_UnicodeConverter_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/UTFString.h"


namespace Poco
{


class Foundation_API UnicodeConverter
/// A convenience class that converts strings from
/// UTF-8 encoded std::strings to UTF-16 or UTF-32 encoded std::wstrings
/// and vice-versa.
///
/// This class is mainly used for working with the Unicode Windows APIs
/// and probably won't be of much use anywhere else ???
{
public:
    static void convert(const std::string & utf8String, UTF32String & utf32String);
    /// Converts the given UTF-8 encoded string into an UTF-32 encoded wide string.

    static void convert(const char * utf8String, std::size_t length, UTF32String & utf32String);
    /// Converts the given UTF-8 encoded character sequence into an UTF-32 encoded wide string.

    static void convert(const char * utf8String, UTF32String & utf32String);
    /// Converts the given zero-terminated UTF-8 encoded character sequence into an UTF-32 encoded wide string.

    static void convert(const std::string & utf8String, UTF16String & utf16String);
    /// Converts the given UTF-8 encoded string into an UTF-16 encoded wide string.

    static void convert(const char * utf8String, std::size_t length, UTF16String & utf16String);
    /// Converts the given UTF-8 encoded character sequence into an UTF-16 encoded wide string.

    static void convert(const char * utf8String, UTF16String & utf16String);
    /// Converts the given zero-terminated UTF-8 encoded character sequence into an UTF-16 encoded wide string.

    static void convert(const UTF16String & utf16String, std::string & utf8String);
    /// Converts the given UTF-16 encoded wide string into an UTF-8 encoded string.

    static void convert(const UTF32String & utf32String, std::string & utf8String);
    /// Converts the given UTF-32 encoded wide string into an UTF-8 encoded string.

    static void convert(const UTF16Char * utf16String, std::size_t length, std::string & utf8String);
    /// Converts the given zero-terminated UTF-16 encoded wide character sequence into an UTF-8 encoded string.

    static void convert(const UTF32Char * utf16String, std::size_t length, std::string & utf8String);
    /// Converts the given zero-terminated UTF-32 encoded wide character sequence into an UTF-8 encoded string.

    static void convert(const UTF16Char * utf16String, std::string & utf8String);
    /// Converts the given UTF-16 encoded zero terminated character sequence into an UTF-8 encoded string.

    static void convert(const UTF32Char * utf32String, std::string & utf8String);
    /// Converts the given UTF-32 encoded zero terminated character sequence into an UTF-8 encoded string.

    template <typename F, typename T>
    static void toUTF32(const F & f, T & t)
    {
        convert(f, t);
    }

    template <typename F, typename T>
    static void toUTF32(const F & f, std::size_t l, T & t)
    {
        convert(f, l, t);
    }

    template <typename F, typename T>
    static void toUTF16(const F & f, T & t)
    {
        convert(f, t);
    }

    template <typename F, typename T>
    static void toUTF16(const F & f, std::size_t l, T & t)
    {
        convert(f, l, t);
    }

    template <typename F, typename T>
    static void toUTF8(const F & f, T & t)
    {
        convert(f, t);
    }

    template <typename F, typename T>
    static void toUTF8(const F & f, std::size_t l, T & t)
    {
        convert(f, l, t);
    }

    template <typename T>
    static T to(const char * pChar)
    {
        T utfStr;
        Poco::UnicodeConverter::convert(pChar, utfStr);
        return utfStr;
    }


    template <typename T>
    static T to(const std::string & str)
    {
        T utfStr;
        Poco::UnicodeConverter::convert(str, utfStr);
        return utfStr;
    }

    template <typename T>
    static std::size_t UTFStrlen(const T * ptr)
    /// Returns the length (in characters) of a zero-terminated UTF string.
    {
        if (ptr == 0)
            return 0;
        const T * p;
        for (p = ptr; *p; ++p)
            ;
        return p - ptr;
    }
};


} // namespace Poco


#endif // Foundation_UnicodeConverter_INCLUDED