ArgumentsExtensions.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 static class ArgumentsExtensions
    {
        public static IEnumerable<Error> Preprocess(this IEnumerable<string> arguments,
                                                    IEnumerable<
                                                        Func<IEnumerable<string>, IEnumerable<Error>>
                                                    > preprocessorLookup)
        {
            return preprocessorLookup.TryHead()
                                     .MapValueOrDefault(func =>
                                                        {
                                                            IEnumerable<Error> errors = func(arguments);
 
                                                            return errors.Any()
                                                                       ? errors
                                                                       : arguments.Preprocess(preprocessorLookup
                                                                               .TailNoFail()
                                                                           );
                                                        },
                                                        Enumerable.Empty<Error>()
                                                       );
        }
    }
}