public GenericParameterDeclarationSyntax WithConstraints(
SeparatedSyntaxList <TypeParameterConstraintSyntax> constraints)
{
TypeParameterConstraintClauseSyntax newConstraintClause = null;
if (constraints.Count != 0)
{
if (constraintClause == null)
{
newConstraintClause = SyntaxFactory.TypeParameterConstraintClause(
SyntaxFactory.IdentifierName(typeParameter.Identifier.Text),
constraints);
}
else
{
newConstraintClause = constraintClause.WithConstraints(constraints);
}
}
return(new GenericParameterDeclarationSyntax(TypeParameter, newConstraintClause));
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
if (!Settings.IsAnyEnabled(
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.IsEnabled(CodeFixIdentifiers.RemoveConstraintClauses))
{
break;
}
GenericInfo genericInfo = SyntaxInfo.GenericInfo(constraintClause);
if (!genericInfo.Success)
{
break;
}
CodeAction codeAction = CodeAction.Create(
"Remove constraints",
cancellationToken =>
{
GenericInfo newGenericInfo = genericInfo.RemoveAllConstraintClauses();
return(context.Document.ReplaceNodeAsync(genericInfo.Node, newGenericInfo.Node, cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case CompilerDiagnosticIdentifiers.ConstraintClauseHasAlreadyBeenSpecified:
{
if (!Settings.IsEnabled(CodeFixIdentifiers.CombineConstraintClauses))
{
break;
}
GenericInfo genericInfo = SyntaxInfo.GenericInfo(constraintClause);
int index = genericInfo.ConstraintClauses.IndexOf(constraintClause);
string name = constraintClause.Name.Identifier.ValueText;
TypeParameterConstraintClauseSyntax constraintClause2 = genericInfo.FindConstraintClause(name);
if (constraintClause2 == null)
{
break;
}
CodeAction codeAction = CodeAction.Create(
$"Combine constraints for '{name}'",
cancellationToken =>
{
TypeParameterConstraintClauseSyntax newConstraintClause = constraintClause2.WithConstraints(constraintClause2.Constraints.AddRange(constraintClause.Constraints));
SyntaxList <TypeParameterConstraintClauseSyntax> newConstraintClauses = genericInfo.ConstraintClauses
.Replace(constraintClause2, newConstraintClause)
.RemoveAt(index);
GenericInfo newGenericInfo = genericInfo.WithConstraintClauses(newConstraintClauses);
return(context.Document.ReplaceNodeAsync(genericInfo.Node, newGenericInfo.Node, cancellationToken));
},
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
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;
}
}
}
}