TypeDescriptor.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 CSharpx;
 
namespace CommandLine.Core
{
    internal struct TypeDescriptor
    {
        private TypeDescriptor(TargetType targetType, Maybe<int> maxItems, Maybe<TypeDescriptor> nextValue = null)
        {
            TargetType = targetType;
            MaxItems = maxItems;
            NextValue = nextValue;
        }
 
        public TargetType TargetType { get; }
 
        public Maybe<int> MaxItems { get; }
 
        public Maybe<TypeDescriptor> NextValue { get; }
 
        public static TypeDescriptor Create(TargetType tag, Maybe<int> maximumItems, TypeDescriptor next = default)
        {
            if (maximumItems == null)
            {
                throw new ArgumentNullException("maximumItems");
            }
 
            return new TypeDescriptor(tag, maximumItems, next.ToMaybe());
        }
    }
 
    internal static class TypeDescriptorExtensions
    {
        public static TypeDescriptor WithNextValue(this TypeDescriptor descriptor, Maybe<TypeDescriptor> nextValue)
        {
            return TypeDescriptor.Create(descriptor.TargetType,
                                         descriptor.MaxItems,
                                         nextValue.GetValueOrDefault(default)
                                        );
        }
    }
}