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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.Diagnostics;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Syntax;
namespace Microsoft.CodeAnalysis.CSharp
{
/// <summary>
/// A SyntaxReference implementation that lazily translates the result (CSharpSyntaxNode) of the
/// original syntax reference to a syntax reference for its NamespaceDeclarationSyntax.
/// </summary>
internal sealed class NamespaceDeclarationSyntaxReference : TranslationSyntaxReference
{
public NamespaceDeclarationSyntaxReference(SyntaxReference reference)
: base(reference)
{
}
protected override SyntaxNode Translate(SyntaxReference reference, CancellationToken cancellationToken)
{
return GetSyntax(reference, cancellationToken);
}
internal static SyntaxNode GetSyntax(SyntaxReference reference, CancellationToken cancellationToken)
{
var node = (CSharpSyntaxNode)reference.GetSyntax(cancellationToken);
// If the node is a name syntax, it's something like "X" or "X.Y" in :
// namespace X.Y.Z
// We want to return the full NamespaceDeclarationSyntax.
while (node is NameSyntax)
{
node = node.Parent;
}
Debug.Assert(node is CompilationUnitSyntax || node is BaseNamespaceDeclarationSyntax);
return node;
}
}
}
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