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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.Collections.Generic;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Formatting;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CSharp.Utilities;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
internal static partial class SyntaxTreeExtensions
{
public static bool IsPreProcessorDirectiveContext(this SyntaxTree syntaxTree, int position, SyntaxToken preProcessorTokenOnLeftOfPosition, CancellationToken cancellationToken)
{
var token = preProcessorTokenOnLeftOfPosition;
var directive = token.GetAncestor<DirectiveTriviaSyntax>();
// Directives contain the EOL, so if the position is within the full span of the
// directive, then it is on that line, the only exception is if the directive is on the
// last line, the position at the end if technically not contained by the directive but
// its also not on a new line, so it should be considered part of the preprocessor
// context.
if (directive == null)
{
return false;
}
return
directive.FullSpan.Contains(position) ||
directive.FullSpan.End == syntaxTree.GetRoot(cancellationToken).FullSpan.End;
}
}
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