public ArgumentsParserOptions(bool defaults = true)
{
if (defaults)
{
FormatProvider = CultureInfo.CurrentCulture;
OptionsSingleValuePolicy = SingleValuePolicy.UseLastValue;
}
}
public MultiValueParseResult Parse(
Type valueType,
IReadOnlyList <string> stringValues,
SingleValuePolicy singleValuePolicy = SingleValuePolicy.UseFirstValue,
Type valueParserType = null,
IFormatProvider formatProvider = null)
{
if (valueType == null)
{
throw new ArgumentNullException(nameof(valueType));
}
if (stringValues == null)
{
throw new ArgumentNullException(nameof(stringValues));
}
if (stringValues.Count == 0)
{
throw new ArgumentOutOfRangeException(nameof(stringValues));
}
bool isCollection = _collectionCtorProvider.TryGetConstructor(valueType, out ICollectionConstructor colCtor);
if (isCollection)
{
var elemType = colCtor.GetElementType(valueType);
valueType = elemType.UnwrapIfNullable();
var valueParser = _valueParserProvider.GetParser(valueType, valueParserType);
int valuesCount = stringValues.Count;
object[] values = new object[valuesCount];
for (int i = 0; i < valuesCount; i++)
{
values[i] = valueParser.Parse(stringValues[i], valueType, formatProvider);
}
var collection = colCtor.Construct(elemType, values);
return(new MultiValueParseResult(collection, valuesCount));
}
else
{
valueType = valueType.UnwrapIfNullable();
var valueParser = _valueParserProvider.GetParser(valueType, valueParserType);
string stringValue = GetSingleValue(stringValues, singleValuePolicy, out var valuesUsed);
var value = valueParser.Parse(stringValue, valueType, formatProvider);
return(new MultiValueParseResult(value, valuesUsed));
}
}
private static string GetSingleValue(
IReadOnlyList <string> stringValues,
SingleValuePolicy singleValuePolicy,
out int valuesUsed)
{
switch (singleValuePolicy)
{
case SingleValuePolicy.UseFirstValue:
valuesUsed = 1;
return(stringValues[0]);
case SingleValuePolicy.UseLastValue:
valuesUsed = stringValues.Count;
return(stringValues[stringValues.Count - 1]);
default:
throw new NotSupportedException($"Unknown single value policy `{singleValuePolicy}`.");
}
}
