/// <summary>
/// Parses the provided args collection and uses its values to set the appropriate properties on the parsable object.
/// </summary>
/// <param name="parsable"></param>
/// <param name="args"></param>
/// <returns></returns>
public static CliParseResult Parse(Parsable parsable, IEnumerable<string> args)
{
if (args == null) throw new CliParseException("Parameter 'args' cannot be null.");
if (parsable == null) throw new CliParseException("Parameter 'parsable' cannot be null.");
var result = new CliParseResult();
try
{
// single enumeration.
var argumentList = args as IList<string> ?? args.ToList();
parsable.PreParse(argumentList, result);
if (result.Successful == false || result.ShowHelp) return result;
result = MapArguments(parsable, argumentList);
parsable.PostParse(argumentList, result);
}
catch (CliParseException ex)
{
result.AddMessageFromException(ex);
}
return result;
}
public override void PreParse(IEnumerable<string> args, CliParseResult result)
{
base.PreParse(args, result);
Path = Environment.CurrentDirectory;
}
/// <summary>
/// Executes after parsing has been performed.
/// </summary>
/// <param name="args"></param>
/// <param name="result"></param>
public virtual void PostParse(IEnumerable<string> args, CliParseResult result)
{
}
private static CliParseResult MapArguments(Parsable parsable, IEnumerable<string> args)
{
var result = new CliParseResult();
var parsableClass = Helper.GetObjectAttribute(parsable, typeof(ParsableClassAttribute)) as ParsableClassAttribute;
var allowedPrefixes = GetParsableClassAllowedPrefixs(parsableClass);
var ignoreUnknowns = parsableClass != null && parsableClass.IgnoreUnknowns;
var tokens = Tokenizer.Tokenize(args, allowedPrefixes).ToList();
result.ShowHelp = tokens.Any(token=>IsHelpToken(token, parsable));
if (tokens.Count == 0)
{
if (parsableClass == null || parsableClass.ShowHelpWhenNoArgumentsProvided) result.ShowHelp = true;
}
var parsableType = parsable.GetType();
List<PropertyInfo> unsetProperties = parsableType.GetProperties().ToList();
List<PropertyInfo> tmpSetProperties = new List<PropertyInfo>();
// find by names
foreach (var prop in unsetProperties)
{
foreach (var argument in prop.GetCustomAttributes(true).OfType<ParsableArgumentAttribute>())
{
// find by name
var token = GetTokenForArgumentByName(tokens, argument);
var propertySet = false;
if(token != null)
propertySet = SetPropertyValue(parsable, token, tokens, argument, prop);
if (!propertySet)
{
// find by position
token = GetTokenForArgumentByPosition(tokens, argument);
propertySet = SetPropertyValue(parsable, token, tokens, argument, prop);
}
// flag property as set and remove later.
if (propertySet)
{
tmpSetProperties.Add(prop);
}
}
}
tmpSetProperties.ForEach(x => unsetProperties.Remove(x));
foreach (var unsetProperty in unsetProperties)
{
foreach (var argument in unsetProperty.GetCustomAttributes(true).OfType<ParsableArgumentAttribute>())
{
if(argument.Required)
result.AddErrorMessage(string.Format(CultureInfo.CurrentCulture,"Required argument '{0}' was not supplied.", argument.Name));
}
}
// unknown/unused aruments
if (!result.ShowHelp && !ignoreUnknowns)
{
tokens.Where(x => !x.Taken)
.ToList()
.ForEach(
x =>
result.AddErrorMessage(string.Format(CultureInfo.CurrentCulture,
"Unknown argument '{0}' was supplied.", x.Value.ToString())));
}
return result;
}