public static bool IsNumber(string s, int index)
{
if (s == null)
{
ThrowHelper.ThrowArgumentNullException(ExceptionArgument.s);
}
if (((uint)index) >= ((uint)s.Length))
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.index);
}
char c = s[index];
if (IsLatin1(c))
{
if (IsAscii(c))
{
return(IsInRange(c, '0', '9'));
}
return(CheckNumber(GetLatin1UnicodeCategory(c)));
}
return(CheckNumber(CharUnicodeInfo.GetUnicodeCategoryInternal(s, index)));
}
public static UnicodeCategory GetUnicodeCategory(string s, int index)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (((uint)index) >= ((uint)s.Length))
{
throw new ArgumentOutOfRangeException(nameof(index));
}
if (IsLatin1(s[index]))
{
return(GetLatin1UnicodeCategory(s[index]));
}
return(CharUnicodeInfo.GetUnicodeCategoryInternal(s, index));
}
public static bool IsSeparator(string s, int index)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (((uint)index) >= ((uint)s.Length))
{
throw new ArgumentOutOfRangeException(nameof(index));
}
char c = s[index];
if (IsLatin1(c))
{
return(IsSeparatorLatin1(c));
}
return(CheckSeparator(CharUnicodeInfo.GetUnicodeCategoryInternal(s, index)));
}
public static bool IsDigit(string s, int index)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (((uint)index) >= ((uint)s.Length))
{
throw new ArgumentOutOfRangeException(nameof(index));
}
char c = s[index];
if (IsLatin1(c))
{
return(IsInRange(c, '0', '9'));
}
return(CharUnicodeInfo.GetUnicodeCategoryInternal(s, index) == UnicodeCategory.DecimalDigitNumber);
}
public static bool IsUpper(string s, int index)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (((uint)index) >= ((uint)s.Length))
{
throw new ArgumentOutOfRangeException(nameof(index));
}
char c = s[index];
if (IsLatin1(c))
{
return((Latin1CharInfo[c] & IsUpperCaseLetterFlag) != 0);
}
return(CharUnicodeInfo.GetUnicodeCategoryInternal(s, index) == UnicodeCategory.UppercaseLetter);
}
public static bool IsLetter(string s, int index)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (((uint)index) >= ((uint)s.Length))
{
throw new ArgumentOutOfRangeException(nameof(index));
}
char c = s[index];
if (IsAscii(c))
{
// The ASCII range doesn't include letters in categories other than "upper" and "lower"
return((Latin1CharInfo[c] & (IsUpperCaseLetterFlag | IsLowerCaseLetterFlag)) != 0);
}
return(CheckLetter(CharUnicodeInfo.GetUnicodeCategoryInternal(s, index)));
}