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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.Diagnostics;
using System.Runtime.Serialization;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis;
/// <summary>
/// Provides information about the way a particular symbol is being used at a symbol reference node.
/// For namespaces and types, this corresponds to values from <see cref="TypeOrNamespaceUsageInfo"/>.
/// For methods, fields, properties, events, locals and parameters, this corresponds to values from <see cref="ValueUsageInfo"/>.
/// </summary>
[DataContract]
internal readonly struct SymbolUsageInfo : IEquatable<SymbolUsageInfo>
{
public static readonly SymbolUsageInfo None = Create(ValueUsageInfo.None);
[DataMember(Order = 0)]
public ValueUsageInfo? ValueUsageInfoOpt { get; }
[DataMember(Order = 1)]
public TypeOrNamespaceUsageInfo? TypeOrNamespaceUsageInfoOpt { get; }
// Must be public since it's used for deserialization.
public SymbolUsageInfo(ValueUsageInfo? valueUsageInfoOpt, TypeOrNamespaceUsageInfo? typeOrNamespaceUsageInfoOpt)
{
Debug.Assert(valueUsageInfoOpt.HasValue ^ typeOrNamespaceUsageInfoOpt.HasValue);
ValueUsageInfoOpt = valueUsageInfoOpt;
TypeOrNamespaceUsageInfoOpt = typeOrNamespaceUsageInfoOpt;
}
public static SymbolUsageInfo Create(ValueUsageInfo valueUsageInfo)
=> new(valueUsageInfo, typeOrNamespaceUsageInfoOpt: null);
public static SymbolUsageInfo Create(TypeOrNamespaceUsageInfo typeOrNamespaceUsageInfo)
=> new(valueUsageInfoOpt: null, typeOrNamespaceUsageInfo);
public bool IsReadFrom()
=> ValueUsageInfoOpt.HasValue && ValueUsageInfoOpt.Value.IsReadFrom();
public bool IsWrittenTo()
=> ValueUsageInfoOpt.HasValue && ValueUsageInfoOpt.Value.IsWrittenTo();
public bool IsNameOnly()
=> ValueUsageInfoOpt.HasValue && ValueUsageInfoOpt.Value.IsNameOnly();
public override bool Equals(object? obj)
=> obj is SymbolUsageInfo && Equals((SymbolUsageInfo)obj);
public bool Equals(SymbolUsageInfo other)
{
if (ValueUsageInfoOpt.HasValue)
{
return other.ValueUsageInfoOpt.HasValue &&
ValueUsageInfoOpt.Value == other.ValueUsageInfoOpt.Value;
}
else
{
RoslynDebug.Assert(TypeOrNamespaceUsageInfoOpt.HasValue);
return other.TypeOrNamespaceUsageInfoOpt.HasValue &&
TypeOrNamespaceUsageInfoOpt.Value == other.TypeOrNamespaceUsageInfoOpt.Value;
}
}
public override int GetHashCode()
=> Hash.Combine(((int?)ValueUsageInfoOpt)?.GetHashCode() ?? 0, ((int?)TypeOrNamespaceUsageInfoOpt)?.GetHashCode() ?? 0);
}
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