Verb.cs

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// 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
{
    internal 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
                                      );
        }
    }
}