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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.Diagnostics;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Debugging;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.CSharp.Debugging;
internal class BreakpointResolver(Solution solution, string text) : AbstractBreakpointResolver(solution, text, LanguageNames.CSharp, EqualityComparer<string>.Default)
{
protected override IEnumerable<ISymbol> GetMembers(INamedTypeSymbol type, string name)
{
var members = type.GetMembers()
.Where(m => m.Name == name ||
m.ExplicitInterfaceImplementations()
.Where(i => i.Name == name)
.Any());
return (type.Name == name) ? members.Concat(type.Constructors) : members;
}
protected override bool HasMethodBody(IMethodSymbol method, CancellationToken cancellationToken)
{
var location = method.Locations.First(loc => loc.IsInSource);
var tree = location.SourceTree;
var token = tree.GetRoot(cancellationToken).FindToken(location.SourceSpan.Start);
return token.GetAncestor<MemberDeclarationSyntax>().GetBody() != null;
}
protected override void ParseText(
out IList<NameAndArity> nameParts,
out int? parameterCount)
{
var text = Text;
Debug.Assert(text != null);
var name = SyntaxFactory.ParseName(text, consumeFullText: false);
var lengthOfParsedText = name.FullSpan.End;
var parameterList = SyntaxFactory.ParseParameterList(text, lengthOfParsedText, consumeFullText: false);
var foundIncompleteParameterList = false;
parameterCount = null;
if (!parameterList.IsMissing)
{
if (parameterList.OpenParenToken.IsMissing || parameterList.CloseParenToken.IsMissing)
{
foundIncompleteParameterList = true;
}
else
{
lengthOfParsedText += parameterList.FullSpan.End;
parameterCount = parameterList.Parameters.Count;
}
}
// If there is remaining text to parse, attempt to eat a trailing semicolon.
if (lengthOfParsedText < text.Length)
{
var token = SyntaxFactory.ParseToken(text, lengthOfParsedText);
if (token.IsKind(SyntaxKind.SemicolonToken))
{
lengthOfParsedText += token.FullSpan.End;
}
}
// It's not obvious, but this method can handle the case where name "IsMissing" (no suitable name was be parsed).
var parts = name.GetNameParts();
// If we could not parse a valid parameter list or there was additional trailing text that could not be
// interpreted, don't return any names or parameters.
// Also, "Break at Function" doesn't seem to support alias qualified names with the old language service,
// and aliases don't seem meaningful for the purposes of resolving symbols from source. Since we don't
// have precedent or a clear user scenario, we won't resolve any alias qualified names (alias qualified
// parameters are accepted, but we still only validate parameter count, similar to the old implementation).
if (!foundIncompleteParameterList && (lengthOfParsedText == text.Length) &&
!parts.Any(p => p.IsKind(SyntaxKind.AliasQualifiedName)))
{
nameParts = parts.Cast<SimpleNameSyntax>().Select(p => new NameAndArity(p.Identifier.ValueText, p.Arity)).ToList();
}
else
{
nameParts = [];
}
}
}
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