private int IndexOfCharOrdinalIgnoreCase(char value)
{
if (!char.IsAscii(value))
{
return(CompareInfo.Invariant.IndexOf(this, value, CompareOptions.OrdinalIgnoreCase));
}
if (char.IsAsciiLetter(value))
{
char valueUc = (char)(value | 0x20);
char valueLc = (char)(value & ~0x20);
return(SpanHelpers.IndexOfAnyChar(ref _firstChar, valueLc, valueUc, Length));
}
return(SpanHelpers.IndexOfChar(ref _firstChar, value, Length));
}
public unsafe int IndexOf(char value, int startIndex, int count)
{
if ((uint)startIndex > (uint)Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.startIndex, ExceptionResource.ArgumentOutOfRange_IndexMustBeLessOrEqual);
}
if ((uint)count > (uint)(Length - startIndex))
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.count, ExceptionResource.ArgumentOutOfRange_Count);
}
int result = SpanHelpers.IndexOfChar(ref Unsafe.Add(ref _firstChar, startIndex), value, count);
return(result < 0 ? result : result + startIndex);
}
// Returns the index of the first occurrence of a specified character in the current instance. // The search starts at startIndex and runs thorough the next count characters. public int IndexOf(char value) => SpanHelpers.IndexOfChar(ref _firstChar, value, Length);