private static bool IsReassignedWithCreated(AssignmentExpressionSyntax assignment, SyntaxNodeAnalysisContext context)
{
if (assignment.FirstAncestor <AccessorDeclarationSyntax>() is AccessorDeclarationSyntax accessor &&
accessor.IsKind(SyntaxKind.SetAccessorDeclaration) &&
assignment.Right is IdentifierNameSyntax assignedIdentifier &&
assignedIdentifier.Identifier.ValueText == "value")
{
return(false);
}
if (Disposable.IsAlreadyAssignedWithCreated(assignment.Left, context.SemanticModel, context.CancellationToken, out var assignedSymbol)
.IsEither(Result.No, Result.AssumeNo, Result.Unknown))
{
return(false);
}
if (assignedSymbol == KnownSymbol.SerialDisposable.Disposable ||
assignedSymbol == KnownSymbol.SingleAssignmentDisposable.Disposable)
{
return(false);
}
if (Disposable.IsDisposedBefore(assignedSymbol, assignment, context.SemanticModel, context.CancellationToken))
{
return(false);
}
if (FieldOrProperty.TryCreate(assignedSymbol, out var fieldOrProperty) &&
TestFixture.IsAssignedAndDisposedInSetupAndTearDown(fieldOrProperty, context.Node.FirstAncestor <TypeDeclarationSyntax>(), context.SemanticModel, context.CancellationToken))
{
return(false);
}
if (IsNullChecked(assignedSymbol, assignment, context.SemanticModel, context.CancellationToken))
{
return(false);
}
if (TryGetAssignedLocal(out var local) &&
Disposable.IsDisposedAfter(local, assignment, context.SemanticModel, context.CancellationToken))
{
return(false);
}
return(true);
bool TryGetAssignedLocal(out ILocalSymbol result)
{
result = null;
if (assignment.TryFirstAncestor(out MemberDeclarationSyntax memberDeclaration))
{
using (var walker = VariableDeclaratorWalker.Borrow(memberDeclaration))
{
return(walker.VariableDeclarators.TrySingle(
x => context.SemanticModel.TryGetSymbol(
x.Initializer?.Value, context.CancellationToken, out ISymbol symbol) &&
symbol.Equals(assignedSymbol),
out var match) &&
match.Initializer.Value.IsExecutedBefore(assignment) == ExecutedBefore.Yes &&
context.SemanticModel.TryGetSymbol(match, context.CancellationToken, out result));
}
}
return(false);
}
}
