public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveTypeParameter))
{
return;
}
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
TypeParameterSyntax typeParameter = root
.FindNode(context.Span, getInnermostNodeForTie: true)?
.FirstAncestorOrSelf <TypeParameterSyntax>();
Debug.Assert(typeParameter != null, $"{nameof(typeParameter)} is null");
if (typeParameter == null)
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case CompilerDiagnosticIdentifiers.TypeParameterHasSameNameAsTypeParameterFromOuterType:
{
TypeParameterInfo info;
if (TypeParameterInfo.TryCreate(typeParameter, out info))
{
CodeAction codeAction = CodeAction.Create(
$"Remove type parameter '{info.Name}'",
cancellationToken =>
{
SeparatedSyntaxList <TypeParameterSyntax> parameters = info.TypeParameterList.Parameters;
TypeParameterListSyntax newTypeParameterList = (parameters.Count == 1)
? default(TypeParameterListSyntax)
: info.TypeParameterList.WithParameters(parameters.Remove(typeParameter));
SyntaxNode newNode = GenericDeclarationHelper.WithTypeParameterList(info.Declaration, newTypeParameterList);
TypeParameterConstraintClauseSyntax constraintClause = info.ConstraintClause;
if (constraintClause != null)
{
newNode = GenericDeclarationHelper.WithConstraintClauses(newNode, info.ConstraintClauses.Remove(constraintClause));
}
return(context.Document.ReplaceNodeAsync(info.Declaration, newNode, cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
}
break;
}
}
}
}
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;
}
}
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
if (!Settings.IsAnyCodeFixEnabled(
CodeFixIdentifiers.RemoveConstraintClauses,
CodeFixIdentifiers.CombineConstraintClauses))
{
return;
}
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindFirstAncestorOrSelf(root, context.Span, out TypeParameterConstraintClauseSyntax constraintClause))
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case CompilerDiagnosticIdentifiers.ConstraintsAreNotAllowedOnNonGenericDeclarations:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveConstraintClauses))
{
break;
}
CodeAction codeAction = CodeAction.Create(
"Remove constraints",
cancellationToken =>
{
SyntaxNode node = constraintClause.Parent;
SyntaxNode newNode = GenericDeclarationHelper.RemoveConstraintClauses(node);
return(context.Document.ReplaceNodeAsync(node, newNode, cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case CompilerDiagnosticIdentifiers.ConstraintClauseHasAlreadyBeenSpecified:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.CombineConstraintClauses))
{
break;
}
SyntaxList <TypeParameterConstraintClauseSyntax> constraintClauses = GenericDeclarationHelper.GetContainingList(constraintClause);
int index = constraintClauses.IndexOf(constraintClause);
string name = constraintClause.NameText();
TypeParameterConstraintClauseSyntax constraintClause2 = constraintClauses.FirstOrDefault(f => string.Equals(name, f.NameText(), StringComparison.Ordinal));
if (constraintClause2 == null)
{
break;
}
CodeAction codeAction = CodeAction.Create(
$"Combine constraints for '{name}'",
cancellationToken =>
{
SyntaxNode node = constraintClause.Parent;
TypeParameterConstraintClauseSyntax newConstraintClause = constraintClause2.WithConstraints(constraintClause2.Constraints.AddRange(constraintClause.Constraints));
SyntaxList <TypeParameterConstraintClauseSyntax> newConstraintClauses = constraintClauses
.Replace(constraintClause2, newConstraintClause)
.RemoveAt(index);
SyntaxNode newNode = GenericDeclarationHelper.WithConstraintClauses(node, newConstraintClauses);
return(context.Document.ReplaceNodeAsync(node, newNode, cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}