// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

namespace CommandLine.Core

{

sealed class Verb

{

public Verb(string name, string helpText, bool hidden, bool isDefault, string[] aliases)

{

if (string.IsNullOrWhiteSpace(name))

throw new ArgumentNullException(nameof(name));

Name = name;

HelpText = helpText ?? throw new ArgumentNullException(nameof(helpText));

Hidden = hidden;

IsDefault = isDefault;

Aliases = aliases ?? new string[0];

}

public string Name { get; private set; }

public string HelpText { get; private set; }

public bool Hidden { get; private set; }

public bool IsDefault { get; private set; }

public string[] Aliases { get; private set; }

public static Verb FromAttribute(VerbAttribute attribute)

{

return new Verb(

attribute.Name,

attribute.HelpText,

attribute.Hidden,

attribute.IsDefault,

attribute.Aliases

);

}

public static IEnumerable<Tuple<Verb, Type>> SelectFromTypes(IEnumerable<Type> types)

{

return from type in types

let attrs = type.GetTypeInfo().GetCustomAttributes(typeof(VerbAttribute), true).ToArray()

where attrs.Length == 1

select Tuple.Create(

FromAttribute((VerbAttribute)attrs.Single()),

type);

}

}

}