PreprocessorGuards.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;
 
namespace CommandLine.Core
{
    internal static class PreprocessorGuards
    {
        public static IEnumerable<Func<IEnumerable<string>, IEnumerable<Error>>>
            Lookup(StringComparer nameComparer, bool autoHelp, bool autoVersion)
        {
            List<Func<IEnumerable<string>, IEnumerable<Error>>> list =
                new List<Func<IEnumerable<string>, IEnumerable<Error>>>();
 
            if (autoHelp)
            {
                list.Add(HelpCommand(nameComparer));
            }
 
            if (autoVersion)
            {
                list.Add(VersionCommand(nameComparer));
            }
 
            return list;
        }
 
        public static Func<IEnumerable<string>, IEnumerable<Error>> HelpCommand(StringComparer nameComparer)
        {
            return
                arguments =>
                    nameComparer.Equals("--help", arguments.First())
                        ? new Error[] { new HelpRequestedError() }
                        : Enumerable.Empty<Error>();
        }
 
        public static Func<IEnumerable<string>, IEnumerable<Error>> VersionCommand(StringComparer nameComparer)
        {
            return
                arguments =>
                    nameComparer.Equals("--version", arguments.First())
                        ? new Error[] { new VersionRequestedError() }
                        : Enumerable.Empty<Error>();
        }
    }
}