//
// UTFString.h
//
// Library: Foundation
// Package: Text
// Module:  UTFString
//
// Definitions of strings for UTF encodings.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_UTFString_INCLUDED
#define Foundation_UTFString_INCLUDED


#include <string>
#include "Poco/Foundation.h"
#include "Poco/Types.h"


namespace Poco
{


struct UTF16CharTraits
{
    typedef std::fpos<std::mbstate_t> u16streampos;
    typedef UInt16 char_type;
    typedef int int_type;
    typedef std::streamoff off_type;
    typedef u16streampos pos_type;
    typedef std::mbstate_t state_type;

    static void assign(char_type & c1, const char_type & c2) { c1 = c2; }

    static bool eq(char_type c1, char_type c2) { return c1 == c2; }

    static bool lt(char_type c1, char_type c2) { return c1 < c2; }

    static int compare(const char_type * s1, const char_type * s2, std::size_t n)
    {
        for (; n; --n, ++s1, ++s2)
        {
            if (lt(*s1, *s2))
                return -1;
            if (lt(*s2, *s1))
                return 1;
        }
        return 0;
    }

    static std::size_t length(const char_type * s)
    {
        std::size_t len = 0;
        for (; !eq(*s, char_type(0)); ++s)
            ++len;
        return len;
    }

    static const char_type * find(const char_type * s, std::size_t n, const char_type & a)
    {
        for (; n; --n)
        {
            if (eq(*s, a))
                return s;
            ++s;
        }
        return 0;
    }

    static char_type * move(char_type * s1, const char_type * s2, std::size_t n)
    {
        char_type * r = s1;
        if (s1 < s2)
        {
            for (; n; --n, ++s1, ++s2)
                assign(*s1, *s2);
        }
        else if (s2 < s1)
        {
            s1 += n;
            s2 += n;
            for (; n; --n)
                assign(*--s1, *--s2);
        }
        return r;
    }

    static char_type * copy(char_type * s1, const char_type * s2, std::size_t n)
    {
        poco_assert(s2 < s1 || s2 >= s1 + n);
        char_type * r = s1;
        for (; n; --n, ++s1, ++s2)
            assign(*s1, *s2);
        return r;
    }

    static char_type * assign(char_type * s, std::size_t n, char_type a)
    {
        char_type * r = s;
        for (; n; --n, ++s)
            assign(*s, a);
        return r;
    }

    static int_type not_eof(int_type c) { return eq_int_type(c, eof()) ? ~eof() : c; }

    static char_type to_char_type(int_type c) { return char_type(c); }

    static int_type to_int_type(char_type c) { return int_type(c); }

    static bool eq_int_type(int_type c1, int_type c2) { return c1 == c2; }

    static int_type eof() { return int_type(0xDFFF); }
};


struct UTF32CharTraits
{
    typedef std::fpos<std::mbstate_t> u32streampos;
    typedef UInt32 char_type;
    typedef int int_type;
    typedef std::streamoff off_type;
    typedef u32streampos pos_type;
    typedef std::mbstate_t state_type;

    static void assign(char_type & c1, const char_type & c2) { c1 = c2; }

    static bool eq(char_type c1, char_type c2) { return c1 == c2; }

    static bool lt(char_type c1, char_type c2) { return c1 < c2; }

    static int compare(const char_type * s1, const char_type * s2, std::size_t n)
    {
        for (; n; --n, ++s1, ++s2)
        {
            if (lt(*s1, *s2))
                return -1;
            if (lt(*s2, *s1))
                return 1;
        }
        return 0;
    }

    static std::size_t length(const char_type * s)
    {
        std::size_t len = 0;
        for (; !eq(*s, char_type(0)); ++s)
            ++len;
        return len;
    }

    static const char_type * find(const char_type * s, std::size_t n, const char_type & a)
    {
        for (; n; --n)
        {
            if (eq(*s, a))
                return s;
            ++s;
        }
        return 0;
    }

    static char_type * move(char_type * s1, const char_type * s2, std::size_t n)
    {
        char_type * r = s1;
        if (s1 < s2)
        {
            for (; n; --n, ++s1, ++s2)
                assign(*s1, *s2);
        }
        else if (s2 < s1)
        {
            s1 += n;
            s2 += n;
            for (; n; --n)
                assign(*--s1, *--s2);
        }
        return r;
    }

    static char_type * copy(char_type * s1, const char_type * s2, std::size_t n)
    {
        poco_assert(s2 < s1 || s2 >= s1 + n);
        char_type * r = s1;
        for (; n; --n, ++s1, ++s2)
            assign(*s1, *s2);
        return r;
    }

    static char_type * assign(char_type * s, std::size_t n, char_type a)
    {
        char_type * r = s;
        for (; n; --n, ++s)
            assign(*s, a);
        return r;
    }

    static int_type not_eof(int_type c) { return eq_int_type(c, eof()) ? ~eof() : c; }

    static char_type to_char_type(int_type c) { return char_type(c); }

    static int_type to_int_type(char_type c) { return int_type(c); }

    static bool eq_int_type(int_type c1, int_type c2) { return c1 == c2; }

    static int_type eof() { return int_type(0xDFFF); }
};


//#if defined(POCO_ENABLE_CPP11) //TODO
//	typedef char16_t       UTF16Char;
//	typedef std::u16string UTF16String;
//	typedef char32_t       UTF32Char;
//	typedef std::u32string UTF32String;
//#else
#ifdef POCO_NO_WSTRING
typedef Poco::UInt16 UTF16Char;
typedef std::basic_string<UTF16Char, UTF16CharTraits> UTF16String;
typedef UInt32 UTF32Char;
typedef std::basic_string<UTF32Char, UTF32CharTraits> UTF32String;
#else // POCO_NO_WSTRING
#    if   defined(__SIZEOF_WCHAR_T__) //gcc
#        if (__SIZEOF_WCHAR_T__ == 2)
typedef wchar_t UTF16Char;
typedef std::wstring UTF16String;
typedef UInt32 UTF32Char;
typedef std::basic_string<UTF32Char, UTF32CharTraits> UTF32String;
#        elif (__SIZEOF_WCHAR_T__ == 4)
typedef Poco::UInt16 UTF16Char;
typedef std::basic_string<UTF16Char, UTF16CharTraits> UTF16String;
typedef wchar_t UTF32Char;
typedef std::wstring UTF32String;
#        endif
#    else // default to 32-bit wchar_t
typedef Poco::UInt16 UTF16Char;
typedef std::basic_string<UTF16Char, UTF16CharTraits> UTF16String;
typedef wchar_t UTF32Char;
typedef std::wstring UTF32String;
#    endif //POCO_OS_FAMILY_WINDOWS
#endif //POCO_NO_WSTRING
//#endif // POCO_ENABLE_CPP11


} // namespace Poco


#endif // Foundation_UTFString_INCLUDED