public static Dictionary <int, ValueAttribute> GetValues(Type type)
{
var result = new Dictionary <int, ValueAttribute>();
foreach (var prop in type.GetProperties())
{
foreach (var value in prop.GetCustomAttributes(typeof(ValueAttribute), true))
{
ValueAttribute valueAttr = (ValueAttribute)value;
if (result.ContainsKey(valueAttr.Index))
{
throw new ParserException("There is more than one [Value] with the index " + valueAttr.Index);
}
if (valueAttr.Index < 0)
{
throw new ParserException("A [Value]'s index cannot be negative");
}
valueAttr.TargetProperty = prop;
VerifyAttribute(valueAttr);
result.Add(valueAttr.Index, valueAttr);
}
}
if (!result.Keys.SequenceEqual(Enumerable.Range(0, result.Count)))
{
throw new ParserException("[Value] indices must be consecutive from 0 to N");
}
return(result);
}
private ParseResult <object> Parse(Type type, string input)
{
// TODO Refactor this whole thing to use exception handling and store common objects in a class
object instance = Activator.CreateInstance(type);
Dictionary <string, OptionAttribute> options = OptionsClassProcessor.GetOptions(type);
Dictionary <int, ValueAttribute> values = OptionsClassProcessor.GetValues(type);
int unsatisfiedCount = options.Count + values.Count;
int nextValueToFill = 0;
OptionAttribute optionExpectingValue = null;
Tokenizer tokenizer = new Tokenizer(input);
while (!tokenizer.AtEnd && unsatisfiedCount > 0)
{
Token token = tokenizer.NextToken;
switch (token.Kind)
{
case TokenKind.LongOption:
case TokenKind.ShortOption:
if (optionExpectingValue != null)
{
return(ParseResult <object> .WithError("No value provided for option '" + optionExpectingValue.Option + "'"));
}
OptionAttribute optionAttr;
if (!options.TryGetValue(token.Value, out optionAttr))
{
return(ParseResult <object> .WithError("Unexpected option '" + token.Value + "'"));
}
if (optionAttr.Satisfied)
{
return(ParseResult <object> .WithError("Multiple values for option '" + token.Value + "' are not allowed"));
}
var alreadySatisfiedExclusiveOption = FirstAlreadySatisfiedMutuallyExclusiveOption(options, optionAttr);
if (alreadySatisfiedExclusiveOption != null)
{
return(ParseResult <object> .WithError("The option '" + token.Value + "' is mutually exclusive with the option '" + alreadySatisfiedExclusiveOption.Option + "' that was already satisfied"));
}
if (optionAttr.TargetProperty.PropertyType == typeof(bool))
{
optionAttr.TargetProperty.SetValue(instance, true);
optionAttr.Satisfied = true;
--unsatisfiedCount;
}
else
{
optionExpectingValue = optionAttr;
}
break;
case TokenKind.Value:
if (optionExpectingValue != null)
{
string error = SetPropertyValue(optionExpectingValue, instance, token.Value);
if (error != null)
{
return(ParseResult <object> .WithError("Error setting option '" + optionExpectingValue.Option + "': " + error));
}
optionExpectingValue.Satisfied = true;
optionExpectingValue = null;
--unsatisfiedCount;
}
else
{
if (nextValueToFill >= values.Count)
{
// There are no more values to fill, just options
return(ParseResult <object> .WithError("Unexpected plain value '" + token.Value + "'"));
}
ValueAttribute valueAttr = values[nextValueToFill];
string error = SetPropertyValue(valueAttr, instance, token.Value);
if (error != null)
{
return(ParseResult <object> .WithError("Error setting value #" + nextValueToFill + ": " + error));
}
valueAttr.Satisfied = true;
--unsatisfiedCount;
++nextValueToFill;
}
break;
case TokenKind.Error:
return(ParseResult <object> .WithError("Error parsing options: " + token.Value));
}
}
SetDefaultValues(instance, options, values);
var errorResult = FindUnsatisfiedOptionsAndValues(options, values);
if (errorResult != null)
{
return(errorResult);
}
errorResult = SetRestOfInputPropertyIfAvailable(type, instance, tokenizer);
if (errorResult != null)
{
return(errorResult);
}
return(ParseResult <object> .WithValue(instance));
}