/// <summary>
/// Create a copy of this string converted to uppercase.
/// </summary>
/// <remarks>
/// This obviously allocates a new array to hold the uppercase data.
///
/// The length of the output is not necessarily the same as the length of the input.
/// </remarks>
public utf8 ToUpper()
{
if (Length == 0)
{
return(Empty);
}
var it = new Utf8Enumerator(this);
int len = 0;
while (it.MoveNext())
{
len += CharInfo.Utf8Length(CharInfo.ToUpper(it.Current.Value));
}
it.Reset();
var buf = new byte[len];
var stream = new MemoryStream(buf);
len = 0;
while (it.MoveNext())
{
Utf8Writer.AppendCodepoint(stream, CharInfo.ToUpper(it.Current.Value));
}
return(new utf8(buf));
}
/// <summary>
/// Create a copy of this string converted to lowercase.
/// </summary>
/// <remarks>
/// This obviously allocates a new array to hold the lowercase data.
///
/// The length of the output is not necessarily the same as the length of the input.
/// </remarks>
public Utf8String ToLower(CultureInfo info)
{
if (Length == 0)
{
return(Empty);
}
var ch = new char[1];
var it = new Utf8Enumerator(this);
int len = 0;
while (it.MoveNext())
{
if (it.Current.Value <= 0x1FFFF)
{
var lc = char.ToLower((char)it.Current.Value);
ch[0] = lc;
len += Encoding.UTF8.GetByteCount(ch);
}
else
{
// We're in emoji land, so no upper/lowercase.
// (This will fail in the future should unicode get codepoints representing
// upper/lowercase characters in this range.)
len += it.Current.EncodedLength;
}
}
it.Reset();
var buf = new byte[len];
while (it.MoveNext())
{
if (it.Current.Value <= 0x1FFFF)
{
var lc = char.ToLower((char)it.Current.Value);
ch[0] = lc;
len += Encoding.UTF8.GetBytes(ch, 0, 1, buf, len);
}
else
{
// We're in emoji land, so no upper/lowercase.
// (This will fail in the future should unicode get codepoints representing
// upper/lowercase characters in this range.)
for (int i = 0; i < it.Current.EncodedLength; i++)
{
buf[len] = this[i + it.Current.Index];
len++;
}
}
}
return(new Utf8String(buf));
}