// Only Azeri and Turkish have their own special cases.
// Other than them, all languages have common special case
// (enumerable enough).
public virtual char ToLower(char c)
{
// quick ASCII range check
if (c < 0x40 || 0x60 < c && c < 128)
{
return(c);
}
else if ('A' <= c && c <= 'Z' && (!handleDotI || c != 'I'))
{
return((char)(c + 0x20));
}
if (ci == null || ci.LCID == 0x7F)
{
return(CharUnicodeInfo.ToLowerInvariant(c));
}
switch (c)
{
case '\u0049': // Latin uppercase I
if (handleDotI)
{
return('\u0131'); // I becomes dotless i
}
break;
case '\u0130': // I-dotted
return('\u0069'); // i
case '\u01c5': // LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON
return('\u01c6');
// \u01c7 -> \u01c9 (LJ) : invariant
case '\u01c8': // LATIN CAPITAL LETTER L WITH SMALL LETTER J
return('\u01c9');
// \u01ca -> \u01cc (NJ) : invariant
case '\u01cb': // LATIN CAPITAL LETTER N WITH SMALL LETTER J
return('\u01cc');
// WITH CARON : invariant
// WITH DIAERESIS AND * : invariant
case '\u01f2': // LATIN CAPITAL LETTER D WITH SMALL LETTER Z
return('\u01f3');
case '\u03d2': // ? it is not in ICU
return('\u03c5');
case '\u03d3': // ? it is not in ICU
return('\u03cd');
case '\u03d4': // ? it is not in ICU
return('\u03cb');
}
return(CharUnicodeInfo.ToLowerInvariant(c));
}