NameLookup.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 CSharpx;
 
namespace CommandLine.Core
{
    internal enum NameLookupResult
    {
        NoOptionFound,
        BooleanOptionFound,
        OtherOptionFound,
    }
 
    internal static class NameLookup
    {
        public static NameLookupResult Contains(string name,
                                                IEnumerable<OptionSpecification> specifications,
                                                StringComparer comparer)
        {
            OptionSpecification option =
                specifications.FirstOrDefault(a => name.MatchName(a.ShortName, a.LongName, comparer));
 
            if (option == null)
            {
                return NameLookupResult.NoOptionFound;
            }
 
            return option.ConversionType == typeof(bool) || (option.ConversionType == typeof(int) && option.FlagCounter)
                       ? NameLookupResult.BooleanOptionFound
                       : NameLookupResult.OtherOptionFound;
        }
 
        public static Maybe<char> HavingSeparator(string name,
                                                  IEnumerable<OptionSpecification> specifications,
                                                  StringComparer comparer)
        {
            return specifications
                   .SingleOrDefault(a => name.MatchName(a.ShortName, a.LongName, comparer) && a.Separator != '\0')
                   .ToMaybe()
                   .MapValueOrDefault(spec => Maybe.Just(spec.Separator), Maybe.Nothing<char>());
        }
    }
}