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// libunicode
// Copyright (C) 2021 Roland Reichwein
#pragma once
#include <algorithm>
#include <string>
namespace {
struct utf8_iterator
{
typedef char32_t value_type;
typedef char32_t& reference;
void get_value()
{
// TODO: set value to current data in *iterator ...
value = 'X';
}
size_t get_number_of_utf8_bytes()
{
// TODO: how many bytes
return 1;
}
// pre-increment
utf8_iterator& operator++()
{
iterator += get_number_of_utf8_bytes();
return *this;
}
bool operator!=(const utf8_iterator& other) const
{
return iterator != other.iterator;
}
reference operator*()
{
get_value();
return value;
}
std::u8string::const_iterator iterator;
std::u8string::const_iterator end_iterator;
value_type value{};
};
struct utf16_back_insert_iterator
{
typedef utf16_back_insert_iterator& reference;
utf16_back_insert_iterator(std::u16string& s): s(s) {}
// no-op
utf16_back_insert_iterator& operator++()
{
return *this;
}
// support *x = value, together with operator=()
reference operator*()
{
return *this;
}
// append utf-16 word sequence
reference operator=(const char32_t& value)
{
s.push_back(0); // TODO
return *this;
}
std::u16string& s;
};
utf16_back_insert_iterator utf16_back_inserter(std::u16string& s)
{
return utf16_back_insert_iterator(s);
}
utf8_iterator utf8_begin(const std::u8string& s)
{
return utf8_iterator{s.cbegin(), s.cend()};
}
utf8_iterator utf8_end(const std::u8string& s)
{
return utf8_iterator{s.cend(), s.cend()};
}
} // namespace
namespace unicode {
// returns number of bytes in UTF-8 byte sequence of first found code point,
// if found. 0 if none found or sequence empty.
//size_t utf8_start()
//{
//}
std::u16string utf8_to_utf16(const std::u8string& s)
{
std::u16string result;
std::copy(utf8_begin(s), utf8_end(s), utf16_back_inserter(result));
return result;
}
//std::u8string utf16_to_utf8(const std::u16string& s)
//{
// std::u8string result;
//
// std::transform(utf16_begin(s), utf16_end(s), std::back_inserter(result));
//
// return result;
//}
} // namespace unicode
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