public static OptionResult ParseOptionTemplate(string template)
{
var result = new OptionResult();
foreach (var token in TemplateTokenizer.Tokenize(template))
{
if (token.TokenKind == TemplateToken.Kind.LongName || token.TokenKind == TemplateToken.Kind.ShortName)
{
if (string.IsNullOrWhiteSpace(token.Value))
{
throw TemplateException.OptionsMustHaveName(template, token);
}
if (char.IsDigit(token.Value[0]))
{
throw TemplateException.OptionNamesCannotStartWithDigit(template, token);
}
foreach (var character in token.Value)
{
if (!char.IsLetterOrDigit(character) && character != '-' && character != '_')
{
throw TemplateException.InvalidCharacterInOptionName(template, token, character);
}
}
}
if (token.TokenKind == TemplateToken.Kind.LongName)
{
if (token.Value.Length == 1)
{
throw TemplateException.LongOptionMustHaveMoreThanOneCharacter(template, token);
}
result.LongNames.Add(token.Value);
}
if (token.TokenKind == TemplateToken.Kind.ShortName)
{
if (token.Value.Length > 1)
{
throw TemplateException.ShortOptionMustOnlyBeOneCharacter(template, token);
}
result.ShortNames.Add(token.Value);
}
if (token.TokenKind == TemplateToken.Kind.RequiredValue ||
token.TokenKind == TemplateToken.Kind.OptionalValue)
{
if (!string.IsNullOrWhiteSpace(result.Value))
{
throw TemplateException.MultipleOptionValuesAreNotSupported(template, token);
}
foreach (var character in token.Value)
{
if (!char.IsLetterOrDigit(character) &&
character != '=' && character != '-' && character != '_')
{
throw TemplateException.InvalidCharacterInValueName(template, token, character);
}
}
result.Value = token.Value.ToUpperInvariant();
result.ValueIsOptional = token.TokenKind == TemplateToken.Kind.OptionalValue;
}
}
if (result.LongNames.Count == 0 &&
result.ShortNames.Count == 0)
{
throw TemplateException.MissingLongAndShortName(template, null);
}
return(result);
}
