public static bool IsValidPrecedingToken(this LicenseTokenType current, LicenseTokenType precedingToken)
{
switch (current)
{
case LicenseTokenType.OPENING_BRACKET: // Legal preceding tokens: None, Operator, OpeningBracket
return(precedingToken.IsOperator() || current == precedingToken);
case LicenseTokenType.CLOSING_BRACKET: // Legal preceding tokens: ClosingBracket, Identifier
return(precedingToken == LicenseTokenType.IDENTIFIER || precedingToken == LicenseTokenType.CLOSING_BRACKET);
case LicenseTokenType.IDENTIFIER: // Legal preceding tokens: None, Operator, OpeningBracket
return(precedingToken.IsOperator() || precedingToken == LicenseTokenType.OPENING_BRACKET);
case LicenseTokenType.AND: // Legal preceding tokens: Identifier, ClosingBracket
case LicenseTokenType.WITH:
case LicenseTokenType.OR:
return(precedingToken == LicenseTokenType.IDENTIFIER || precedingToken == LicenseTokenType.CLOSING_BRACKET);
default:
return(false);
}
}
internal LicenseExpressionToken(string value, LicenseTokenType tokenType)
{
Value = value ?? throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, Strings.ArgumentCannotBeNullOrEmpty, nameof(value)));
TokenType = tokenType;
}
public static bool IsOperator(this LicenseTokenType tokenType)
{
return(tokenType == LicenseTokenType.WITH || tokenType == LicenseTokenType.AND || tokenType == LicenseTokenType.OR);
}
