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OptionKey.cs
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OptionKey.cs
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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 Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.Options
{
/// <inheritdoc cref="OptionKey2"/>
[NonDefaultable]
public readonly struct OptionKey : IEquatable<OptionKey>
{
/// <inheritdoc cref="OptionKey2.Option"/>
public IOption Option { get; }
/// <inheritdoc cref="OptionKey2.Language"/>
public string? Language { get; }
public OptionKey(IOption option, string? language = null)
{
if (language != null && !option.IsPerLanguage)
{
throw new ArgumentException(WorkspacesResources.A_language_name_cannot_be_specified_for_this_option);
}
else if (language == null && option.IsPerLanguage)
{
throw new ArgumentNullException(WorkspacesResources.A_language_name_must_be_specified_for_this_option);
}
this.Option = option ?? throw new ArgumentNullException(nameof(option));
this.Language = language;
}
public override bool Equals(object? obj)
{
return obj is OptionKey key &&
Equals(key);
}
public bool Equals(OptionKey other)
{
return OptionEqual(Option, other.Option) && Language == other.Language;
static bool OptionEqual(IOption thisOption, IOption otherOption)
{
if (thisOption is not IOption2 thisOption2 ||
otherOption is not IOption2 otherOption2)
{
// Third party definition of 'IOption'.
return thisOption.Equals(otherOption);
}
return thisOption2.Equals(otherOption2);
}
}
public override int GetHashCode()
{
var hash = Option?.GetHashCode() ?? 0;
if (Language != null)
{
hash = unchecked((hash * (int)0xA5555529) + Language.GetHashCode());
}
return hash;
}
public override string ToString()
{
if (Option is null)
{
return "";
}
var languageDisplay = Option.IsPerLanguage
? $"({Language}) "
: string.Empty;
return languageDisplay + Option.ToString();
}
public static bool operator ==(OptionKey left, OptionKey right)
=> left.Equals(right);
public static bool operator !=(OptionKey left, OptionKey right)
=> !left.Equals(right);
}
}