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add a namespace nana::utf for UTF-8 character processing

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This commit is contained in:
Jinhao
2016-01-01 12:30:18 +08:00
parent a42ebe19b4
commit 0a4f04267e
4 changed files with 199 additions and 2 deletions
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18
include/nana/charset.hpp
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@@ -18,6 +18,24 @@
namespace nana
{
namespace utf
{
/// Attempt to get a pointer to a character of UTF-8 string by a specifed character index.
/// @param text_utf8 A string encoded as UTF-8.
/// @param pos The unicode character index.
/// @returns A pointer to the unicode character. It returns a null if pos is out of range.
const char* char_ptr(const char* text_utf8, unsigned pos);
const char* char_ptr(const ::std::string& text_utf8, unsigned pos);
/// Get the unicode character by a specified character index.
/// @param text_utf8 A string encoded as UTF-8.
/// @param pos The unicode character index.
/// @param len A unsigned pointer to receive the number of bytes it takes in UTF-8 encoded. If len is a nullptr, it is ignored.
/// @returns A unicode character. '\0' if pos is out of range.
wchar_t char_at(const char* text_utf8, unsigned pos, unsigned * len);
wchar_t char_at(const ::std::string& text_utf8, unsigned pos, unsigned * len);
}
enum class unicode
{
utf8, utf16, utf32