private void RemoveConstraint(
CodeFixContext context,
Diagnostic diagnostic,
TypeParameterConstraintSyntax constraint)
{
SeparatedSyntaxList <TypeParameterConstraintSyntax> constraints;
if (GenericDeclarationHelper.TryGetContainingList(constraint, out constraints))
{
CodeAction codeAction = CodeAction.Create(
$"Remove constraint '{constraint}'",
cancellationToken => context.Document.RemoveNodeAsync(constraint, RemoveHelper.GetRemoveOptions(constraint), cancellationToken),
GetEquivalenceKey(diagnostic, constraint.Kind().ToString()));
context.RegisterCodeFix(codeAction, diagnostic);
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
if (!Settings.IsAnyCodeFixEnabled(
CodeFixIdentifiers.RemoveConstraint,
CodeFixIdentifiers.MoveConstraint))
{
return;
}
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindFirstAncestorOrSelf(root, context.Span, out TypeParameterConstraintSyntax constraint))
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case CompilerDiagnosticIdentifiers.NewConstraintMustBeLastConstraintSpecified:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.MoveConstraint))
{
break;
}
SeparatedSyntaxList <TypeParameterConstraintSyntax> constraints;
if (GenericDeclarationHelper.TryGetContainingList(constraint, out constraints))
{
MoveConstraint(context, diagnostic, constraint, constraints, constraints.Count - 1);
}
break;
}
case CompilerDiagnosticIdentifiers.DuplicateConstraintForTypeParameter:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveConstraint))
{
RemoveConstraint(context, diagnostic, constraint);
}
break;
}
case CompilerDiagnosticIdentifiers.ClassOrStructConstraintMustComeBeforeAnyOtherConstraints:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.MoveConstraint))
{
break;
}
SeparatedSyntaxList <TypeParameterConstraintSyntax> constraints;
if (GenericDeclarationHelper.TryGetContainingList(constraint, out constraints))
{
if (IsDuplicateConstraint(constraint, constraints))
{
RemoveConstraint(context, diagnostic, constraint);
}
else
{
MoveConstraint(context, diagnostic, constraint, constraints, 0);
}
}
break;
}
case CompilerDiagnosticIdentifiers.CannotSpecifyBothConstraintClassAndClassOrStructConstraint:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveConstraint))
{
break;
}
RemoveConstraint(context, diagnostic, constraint);
SeparatedSyntaxList <TypeParameterConstraintSyntax> constraintClauses;
if (GenericDeclarationHelper.TryGetContainingList(constraint, out constraintClauses))
{
TypeParameterConstraintSyntax classConstraint = constraintClauses.Find(SyntaxKind.ClassConstraint);
if (classConstraint != null)
{
RemoveConstraint(context, diagnostic, classConstraint);
}
TypeParameterConstraintSyntax structConstraint = constraintClauses.Find(SyntaxKind.StructConstraint);
if (structConstraint != null)
{
RemoveConstraint(context, diagnostic, structConstraint);
}
}
break;
}
case CompilerDiagnosticIdentifiers.NewConstraintCannotBeUsedWithStructConstraint:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveConstraint))
{
break;
}
RemoveConstraint(context, diagnostic, constraint);
SeparatedSyntaxList <TypeParameterConstraintSyntax> constraintClauses;
if (GenericDeclarationHelper.TryGetContainingList(constraint, out constraintClauses))
{
TypeParameterConstraintSyntax structConstraint = constraintClauses.Find(SyntaxKind.StructConstraint);
RemoveConstraint(context, diagnostic, structConstraint);
}
break;
}
}
}
}