/// <summary>
/// Converts the pattern expression into a collection of descriptions
/// of parameters.
/// </summary>
/// <param name="pOptions">Parser options to use.</param>
/// <param name="pHelpProvider"></param>
/// <param name="pPattern">A string containing the syntax pattern for the application's argument.</param>
/// <returns>A collection of descriptions.</returns>
public static List <Description> Create(CliOptions pOptions, iHelpProvider pHelpProvider, string pPattern)
{
string[] strings = pPattern.Split(' ');
return((from str in strings
where !string.IsNullOrWhiteSpace(str)
select Parse(pOptions, pHelpProvider, str)).ToList());
}
/// <summary>
/// Converts the pattern for a single parameter description into an
/// initialized description object.
/// </summary>
/// <param name="pOptions">Parsing options to use.</param>
/// <param name="pHelpProvider"></param>
/// <param name="pPattern">A string containing the syntax of a single argument.</param>
/// <returns>A description object</returns>
/// <exception cref="SyntaxErrorException"></exception>
public static Description Parse(CliOptions pOptions, iHelpProvider pHelpProvider, string pPattern)
{
if (string.IsNullOrWhiteSpace(pPattern))
{
throw new SyntaxErrorException(Errors.DescriptionFactoryNoPattern);
}
string pattern = pPattern.Trim();
eSCOPE scope = pattern.StartsWith("[") && pattern.EndsWith("]") ? eSCOPE.OPTIONAL : eSCOPE.REQUIRED;
pattern = scope == eSCOPE.OPTIONAL ? pattern.Substring(1, pattern.Length - 2) : pattern;
eROLE role = pattern.StartsWith(pOptions.Prefix) ? eROLE.NAMED : eROLE.PASSED;
pattern = role == eROLE.NAMED ? pattern.Substring(pOptions.Prefix.Length) : pattern;
eMULTIPLICITY multi = pattern.EndsWith("#") ? eMULTIPLICITY.MULTIPLE : eMULTIPLICITY.ONCE;
pattern = multi == eMULTIPLICITY.MULTIPLE ? pattern.Substring(0, pattern.Length - 1) : pattern;
int equal = pattern.IndexOf(pOptions.EqualChar, StringComparison.Ordinal);
string type = equal == -1 ? null : pattern.Substring(equal + 1).ToLower();
string name = equal == -1 ? pattern : pattern.Substring(0, equal);
iParamType paramType = type == null ? null : ParamTypeFactory.Create(type);
if (paramType == null && role == eROLE.PASSED)
{
paramType = new ParamString();
}
if (string.IsNullOrWhiteSpace(name))
{
throw new SyntaxErrorException(Errors.DescriptionName);
}
string help = pHelpProvider.Get(name);
return(new Description(name, help, role, paramType, scope, multi));
}
