// 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

{

struct TypeDescriptor

{

private readonly TargetType targetType;

private readonly Maybe<int> maxItems;

private readonly Maybe<TypeDescriptor> nextValue;

private TypeDescriptor(TargetType targetType, Maybe<int> maxItems, Maybe<TypeDescriptor> nextValue = null)

{

this.targetType = targetType;

this.maxItems = maxItems;

this.nextValue = nextValue;

}

public TargetType TargetType

{

get { return targetType; }

}

public Maybe<int> MaxItems

{

get { return maxItems; }

}

public Maybe<TypeDescriptor> NextValue

{

get { return this.nextValue; }

}

public static TypeDescriptor Create(TargetType tag, Maybe<int> maximumItems, TypeDescriptor next = default(TypeDescriptor))

{

if (maximumItems == null) throw new ArgumentNullException("maximumItems");

return new TypeDescriptor(tag, maximumItems, next.ToMaybe());

}

}

static class TypeDescriptorExtensions

{

public static TypeDescriptor WithNextValue(this TypeDescriptor descriptor, Maybe<TypeDescriptor> nextValue)

{

return TypeDescriptor.Create(descriptor.TargetType, descriptor.MaxItems, nextValue.GetValueOrDefault(default(TypeDescriptor)));

}

}

}