/// <summary>
/// Return true while the string is alphabetic, e.g. contains only letters.
/// </summary>
///
/// <param name="index">
/// Zero-based index of the current position in the string.
/// </param>
/// <param name="character">
/// The character at the current position.
/// </param>
///
/// <returns>
/// True if the current character is valid for this pattern, false if not.
/// </returns>
public static bool Alpha(int index, char character)
{
return(CharacterData.IsType(character, CharacterType.Alpha));
}
public static bool Alphanumeric(int index, char character)
{
return(CharacterData.IsType(character, CharacterType.Alpha | CharacterType.NumberPart));
}
/// <summary>
/// Test whether the character is an operator.
/// </summary>
///
/// <param name="index">
/// Zero-based index of this character's position. Not used for this test.
/// </param>
/// <param name="character">
/// The character.
/// </param>
///
/// <returns>
/// true if it is an operator, false if it fails.
/// </returns>
public static bool Operator(int index, char character)
{
return(CharacterData.IsType(character, CharacterType.Operator));
}
/// <summary>
/// A matching function that validates
/// </summary>
///
/// <param name="index">
/// Zero-based index of the.
/// </param>
/// <param name="character">
/// The character.
/// </param>
///
/// <returns>
/// true if it succeeds, false if it fails.
/// </returns>
public static bool PseudoSelector(int index, char character)
{
return(index == 0 ? CharacterData.IsType(character, CharacterType.Alpha) :
CharacterData.IsType(character, CharacterType.Alpha) || character == '-');
}
/// <summary>
/// Test whether the character is a bound character.
/// </summary>
///
/// <param name="index">
/// Zero-based index of the current position in the string.
/// </param>
/// <param name="character">
/// The character at the current position.
/// </param>
///
/// <returns>
/// true if it succeeds, false if it fails.
/// </returns>
public static bool BoundChar(int index, char character)
{
return(CharacterData.IsType(character, CharacterType.Enclosing | CharacterType.Quote));
}
/// <summary>
/// Test whether the character is a quote character.
/// </summary>
///
/// <param name="index">
/// Zero-based index of the current position in the string.
/// </param>
/// <param name="character">
/// The character at the current position.
/// </param>
///
/// <returns>
/// true if it succeeds, false if it fails.
/// </returns>
public static bool QuoteChar(int index, char character)
{
return(CharacterData.IsType(character, CharacterType.Quote));
}
/// <summary>
/// Test whether the character is whitespace.
/// </summary>
///
/// <param name="index">
/// Zero-based index of the current position in the string. Not used for this test.
/// </param>
/// <param name="character">
/// The character at the current position.
/// </param>
///
/// <returns>
/// true if it is whitespace, false if it fails.
/// </returns>
public static bool NonWhitespace(int index, char character)
{
return(!CharacterData.IsType(character, CharacterType.Whitespace));
}