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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Composition;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Completion;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Shared.Extensions;
namespace Microsoft.CodeAnalysis.CSharp.Completion.Providers;
[ExportArgumentProvider(nameof(DefaultArgumentProvider), LanguageNames.CSharp)]
[ExtensionOrder(After = nameof(OutVariableArgumentProvider))]
[Shared]
internal sealed class DefaultArgumentProvider : AbstractDefaultArgumentProvider
{
[ImportingConstructor]
[Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
public DefaultArgumentProvider()
{
}
public override Task ProvideArgumentAsync(ArgumentContext context)
{
if (context.PreviousValue is { })
{
context.DefaultValue = context.PreviousValue;
}
else if (context.Parameter.Type.IsReferenceType || context.Parameter.Type.IsNullable())
{
context.DefaultValue = "null";
}
else
{
context.DefaultValue = context.Parameter.Type.SpecialType switch
{
SpecialType.System_Boolean => "false",
SpecialType.System_Char => @"'\\0'",
SpecialType.System_Byte => "(byte)0",
SpecialType.System_SByte => "(sbyte)0",
SpecialType.System_Int16 => "(short)0",
SpecialType.System_UInt16 => "(ushort)0",
SpecialType.System_Int32 => "0",
SpecialType.System_UInt32 => "0U",
SpecialType.System_Int64 => "0L",
SpecialType.System_UInt64 => "0UL",
SpecialType.System_Decimal => "0.0m",
SpecialType.System_Single => "0.0f",
SpecialType.System_Double => "0.0",
_ => "default",
};
}
return Task.CompletedTask;
}
}
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