public ArgumentsRule(
Func <AppliedOption, string> validate,
IReadOnlyCollection <string> allowedValues = null,
Func <string> defaultValue = null,
string description = null,
string name = null,
Func <ParseResult, IEnumerable <string> > suggest = null)
{
if (validate == null)
{
throw new ArgumentNullException(nameof(validate));
}
this.defaultValue = new Lazy <string>(defaultValue ?? (() => null));
Description = description;
Name = name;
this.validate = validate;
if (suggest == null)
{
this.suggest = result =>
AllowedValues.FindSuggestions(result);
}
else
{
this.suggest = result =>
suggest(result).ToArray()
.FindSuggestions(
result.TextToMatch());
}
AllowedValues = allowedValues ?? Array.Empty <string>();
}