|
// 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.
#nullable disable
using System.Collections.Immutable;
using System.Diagnostics;
namespace Microsoft.CodeAnalysis.CSharp.Symbols
{
/// <summary>
/// Represents a custom modifier (modopt/modreq).
/// </summary>
internal abstract partial class CSharpCustomModifier : CustomModifier
{
protected readonly NamedTypeSymbol modifier;
private CSharpCustomModifier(NamedTypeSymbol modifier)
{
Debug.Assert((object)modifier != null);
this.modifier = modifier;
}
/// <summary>
/// A type used as a tag that indicates which type of modification applies.
/// </summary>
public override INamedTypeSymbol Modifier
{
get
{
return modifier.GetPublicSymbol();
}
}
public NamedTypeSymbol ModifierSymbol
{
get
{
return modifier;
}
}
public abstract override int GetHashCode();
public abstract override bool Equals(object obj);
internal static CustomModifier CreateOptional(NamedTypeSymbol modifier)
{
return new OptionalCustomModifier(modifier);
}
internal static CustomModifier CreateRequired(NamedTypeSymbol modifier)
{
return new RequiredCustomModifier(modifier);
}
internal static ImmutableArray<CustomModifier> Convert(ImmutableArray<ModifierInfo<TypeSymbol>> customModifiers)
{
if (customModifiers.IsDefault)
{
return ImmutableArray<CustomModifier>.Empty;
}
return customModifiers.SelectAsArray(Convert);
}
private static CustomModifier Convert(ModifierInfo<TypeSymbol> customModifier)
{
var modifier = (NamedTypeSymbol)customModifier.Modifier;
return customModifier.IsOptional ? CreateOptional(modifier) : CreateRequired(modifier);
}
private class OptionalCustomModifier : CSharpCustomModifier
{
public OptionalCustomModifier(NamedTypeSymbol modifier)
: base(modifier)
{ }
public override bool IsOptional
{
get
{
return true;
}
}
public override int GetHashCode()
{
return modifier.GetHashCode();
}
public override bool Equals(object obj)
{
if (ReferenceEquals(this, obj))
{
return true;
}
OptionalCustomModifier other = obj as OptionalCustomModifier;
return other != null && other.modifier.Equals(this.modifier);
}
}
private class RequiredCustomModifier : CSharpCustomModifier
{
public RequiredCustomModifier(NamedTypeSymbol modifier)
: base(modifier)
{ }
public override bool IsOptional
{
get
{
return false;
}
}
public override int GetHashCode()
{
return modifier.GetHashCode();
}
public override bool Equals(object obj)
{
if (ReferenceEquals(this, obj))
{
return true;
}
RequiredCustomModifier other = obj as RequiredCustomModifier;
return other != null && other.modifier.Equals(this.modifier);
}
}
}
}
|