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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.Text;
namespace Microsoft.CodeAnalysis.Syntax
{
/// <summary>
/// This is a SyntaxReference implementation that lazily translates the result (SyntaxNode) of the
/// original syntax reference to another one.
/// </summary>
internal abstract class TranslationSyntaxReference : SyntaxReference
{
private readonly SyntaxReference _reference;
protected TranslationSyntaxReference(SyntaxReference reference)
{
_reference = reference;
}
public sealed override TextSpan Span
{
get { return _reference.Span; }
}
public sealed override SyntaxTree SyntaxTree
{
get { return _reference.SyntaxTree; }
}
public sealed override SyntaxNode GetSyntax(CancellationToken cancellationToken = default(CancellationToken))
{
var node = Translate(_reference, cancellationToken);
Debug.Assert(node.SyntaxTree == _reference.SyntaxTree);
return node;
}
protected abstract SyntaxNode Translate(SyntaxReference reference, CancellationToken cancellationToken);
}
}
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