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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.
#nullable disable
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.VisualStudio.Text;
using VsTextSpan = Microsoft.VisualStudio.TextManager.Interop.TextSpan;
namespace Microsoft.VisualStudio.LanguageServices.Implementation.Snippets;
internal class SnippetFunctionClassName : AbstractSnippetFunction
{
protected readonly string FieldName;
public SnippetFunctionClassName(SnippetExpansionClient snippetExpansionClient, ITextBuffer subjectBuffer, string fieldName, IThreadingContext threadingContext)
: base(snippetExpansionClient, subjectBuffer, threadingContext)
{
this.FieldName = fieldName;
}
protected override async Task<(int ExitCode, string Value, int HasDefaultValue)> GetDefaultValueAsync(CancellationToken cancellationToken)
{
var hasDefaultValue = 0;
var value = string.Empty;
var document = GetDocument(cancellationToken);
if (document is null)
return (VSConstants.E_FAIL, value, hasDefaultValue);
var surfaceBufferFieldSpan = new VsTextSpan[1];
if (snippetExpansionClient.ExpansionSession.GetFieldSpan(FieldName, surfaceBufferFieldSpan) != VSConstants.S_OK)
return (VSConstants.E_FAIL, value, hasDefaultValue);
if (!snippetExpansionClient.TryGetSubjectBufferSpan(surfaceBufferFieldSpan[0], out var subjectBufferFieldSpan))
return (VSConstants.E_FAIL, value, hasDefaultValue);
var snippetFunctionService = document.Project.GetRequiredLanguageService<SnippetFunctionService>();
value = await snippetFunctionService.GetContainingClassNameAsync(document, subjectBufferFieldSpan.Start.Position, cancellationToken).ConfigureAwait(false);
if (!string.IsNullOrWhiteSpace(value))
hasDefaultValue = 1;
return (VSConstants.S_OK, value, hasDefaultValue);
}
}
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