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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 Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Shared.Extensions;
namespace Microsoft.CodeAnalysis.CSharp.Extensions;
internal static class MemberAccessExpressionSyntaxExtensions
{
public static SimpleNameSyntax GetNameWithTriviaMoved(this MemberAccessExpressionSyntax memberAccess)
=> memberAccess.Name
.WithLeadingTrivia(GetLeadingTriviaForSimplifiedMemberAccess(memberAccess))
.WithTrailingTrivia(memberAccess.GetTrailingTrivia());
private static SyntaxTriviaList GetLeadingTriviaForSimplifiedMemberAccess(MemberAccessExpressionSyntax memberAccess)
{
// We want to include any user-typed trivia that may be present between the 'Expression', 'OperatorToken' and 'Identifier' of the MemberAccessExpression.
// However, we don't want to include any elastic trivia that may have been introduced by the expander in these locations. This is to avoid triggering
// aggressive formatting. Otherwise, formatter will see this elastic trivia added by the expander and use that as a cue to introduce unnecessary blank lines
// etc. around the user's original code.
return [.. WithoutElasticTrivia(
memberAccess.GetLeadingTrivia()
.AddRange(memberAccess.Expression.GetTrailingTrivia())
.AddRange(memberAccess.OperatorToken.LeadingTrivia)
.AddRange(memberAccess.OperatorToken.TrailingTrivia)
.AddRange(memberAccess.Name.GetLeadingTrivia()))];
}
private static IEnumerable<SyntaxTrivia> WithoutElasticTrivia(IEnumerable<SyntaxTrivia> list)
=> list.Where(t => !t.IsElastic());
}
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