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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;
using System.Collections.Generic;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Rename.ConflictEngine;
namespace Microsoft.CodeAnalysis.CSharp.Rename;
internal sealed class LabelConflictVisitor : CSharpSyntaxVisitor
{
private readonly ConflictingIdentifierTracker _tracker;
public LabelConflictVisitor(SyntaxToken tokenBeingRenamed)
=> _tracker = new ConflictingIdentifierTracker(tokenBeingRenamed, StringComparer.Ordinal);
public override void DefaultVisit(SyntaxNode node)
{
foreach (var child in node.ChildNodes())
{
Visit(child);
}
}
public override void VisitBlock(BlockSyntax node)
{
var tokens = new List<SyntaxToken>();
// We want to collect any labels and add them all at once for this scope
foreach (var statement in node.Statements)
{
if (statement is LabeledStatementSyntax declarationStatement)
{
tokens.Add(declarationStatement.Identifier);
}
}
_tracker.AddIdentifiers(tokens);
DefaultVisit(node);
_tracker.RemoveIdentifiers(tokens);
}
public IEnumerable<SyntaxToken> ConflictingTokens
{
get
{
return _tracker.ConflictingTokens;
}
}
}
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