private static char[] SeparatorsForStringSplit(SeparateStringOptions options)
{
var allSeparators = Enumerable.Range(char.MinValue, char.MaxValue)
.Select(c => (char) c).Where(c => !char.IsControl(c));
IEnumerable<char> actualSeparators;
switch (options)
{
case SeparateStringOptions.WordOnlyFromLetters:
actualSeparators = allSeparators.Where(c => !char.IsLetter(c));
break;
case SeparateStringOptions.WordFromLettersAndDigits:
actualSeparators =
allSeparators.Where(c => !char.IsLetter(c) && !char.IsDigit(c) && !char.IsNumber(c));
break;
case SeparateStringOptions.WordFromSymbolsOtherThanSpaces:
actualSeparators = allSeparators.Where(c => char.IsSeparator(c));
break;
default:
throw new ArgumentException("You have entered a wrong convert option. Please, check it!");
break;
}
return actualSeparators.ToArray();
}
/// <summary>
/// Counts words number in passed string. Can be depended on passed separators types.
/// </summary>
/// <param name="inputString">String to count words.</param>
/// <param name="options">Separators types.</param>
/// <returns>Number words in string.</returns>
public static int WordsCount(this string inputString,
SeparateStringOptions options = SeparateStringOptions.WordOnlyFromLetters)
{
char[] separators = SeparatorsForStringSplit(options);
return inputString.Split(separators, StringSplitOptions.RemoveEmptyEntries).Count();
}