// 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;
using System.Collections.Generic;
using System.Composition;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Highlighting;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Text;

namespace Microsoft.CodeAnalysis.CSharp.KeywordHighlighting.KeywordHighlighters;

[ExportHighlighter(LanguageNames.CSharp), Shared]
internal sealed class TryStatementHighlighter : AbstractKeywordHighlighter<TryStatementSyntax>
{
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public TryStatementHighlighter()
    {
    }

    protected override void AddHighlights(
        TryStatementSyntax tryStatement, List<TextSpan> highlights, CancellationToken cancellationToken)
    {
        highlights.Add(tryStatement.TryKeyword.Span);

        foreach (var catchDeclaration in tryStatement.Catches)
        {
            highlights.Add(catchDeclaration.CatchKeyword.Span);

            if (catchDeclaration.Filter != null)
            {
                highlights.Add(catchDeclaration.Filter.WhenKeyword.Span);
            }
        }

        if (tryStatement.Finally != null)
        {
            highlights.Add(tryStatement.Finally.FinallyKeyword.Span);
        }
    }
}