// 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;
using System.Collections.Generic;
using System.Composition;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Extensions;
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]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class ConditionalPreprocessorHighlighter() : AbstractKeywordHighlighter<DirectiveTriviaSyntax>
{
    protected override void AddHighlights(
        DirectiveTriviaSyntax directive, List<TextSpan> highlights, CancellationToken cancellationToken)
    {
        var conditionals = directive.GetMatchingConditionalDirectives(cancellationToken);
        foreach (var conditional in conditionals)
        {
            highlights.Add(TextSpan.FromBounds(
                conditional.HashToken.SpanStart,
                conditional.DirectiveNameToken.Span.End));
        }
    }
}