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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.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Completion.Providers;
using Microsoft.CodeAnalysis.EmbeddedLanguages;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.Shared.Extensions;
namespace Microsoft.CodeAnalysis.Features.EmbeddedLanguages.DateAndTime.LanguageServices;
internal sealed class DateAndTimeEmbeddedLanguage : IEmbeddedLanguage
{
public readonly EmbeddedLanguageInfo Info;
public DateAndTimeEmbeddedLanguage(EmbeddedLanguageInfo info)
{
Info = info;
CompletionProvider = new DateAndTimeEmbeddedCompletionProvider(this);
}
public EmbeddedLanguageCompletionProvider CompletionProvider { get; }
public async Task<SyntaxToken?> TryGetDateAndTimeTokenAtPositionAsync(
Document document, int position, CancellationToken cancellationToken)
{
var syntaxFacts = document.GetRequiredLanguageService<ISyntaxFactsService>();
var root = await document.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var token = GetToken(syntaxFacts, root, position);
var semanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var detector = DateAndTimeLanguageDetector.GetOrCreate(semanticModel.Compilation, this.Info);
return detector.TryParseString(token, semanticModel, cancellationToken) != null
? token : null;
}
private static SyntaxToken GetToken(ISyntaxFactsService syntaxFacts, SyntaxNode root, int position)
{
var token = root.FindToken(position);
var syntaxKinds = syntaxFacts.SyntaxKinds;
if (token.RawKind == syntaxKinds.CloseBraceToken)
{
// Might be here: $"Date is: {date:$$}" or
// $"Date is: {date:G$$}"
//
// If so, we want to return the InterpolatedStringTextToken following the `:`
var previous = token.GetPreviousToken();
if (previous.RawKind == syntaxKinds.InterpolatedStringTextToken)
return previous;
if (previous.RawKind == syntaxKinds.ColonToken)
return previous.GetNextToken(includeZeroWidth: true);
}
return token;
}
}
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