/// <inheritdoc/>
public override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
var token = syntaxRoot.FindToken(diagnostic.Location.SourceSpan.Start);
if (string.IsNullOrEmpty(token.ValueText) || token.IsMissing)
{
continue;
}
var node = syntaxRoot.FindNode(diagnostic.Location.SourceSpan, getInnermostNodeForTie: true);
if (node is ObjectCreationExpressionSyntax objectCreation)
{
var type = (ITypeSymbol)semanticModel.GetSymbolSafe(objectCreation, context.CancellationToken)?.ContainingSymbol;
if (type == null)
{
continue;
}
var parameterSyntax = SyntaxFactory.Parameter(SyntaxFactory.Identifier(ParameterName(type)))
.WithType(objectCreation.Type);
switch (GU0007PreferInjecting.CanInject(objectCreation, semanticModel, context.CancellationToken))
{
case GU0007PreferInjecting.Injectable.No:
continue;
case GU0007PreferInjecting.Injectable.Safe:
context.RegisterCodeFix(
CodeAction.Create(
"Inject",
cancellationToken => ApplyFixAsync(context, semanticModel, cancellationToken, objectCreation, parameterSyntax),
nameof(InjectFix)),
diagnostic);
break;
case GU0007PreferInjecting.Injectable.Unsafe:
context.RegisterCodeFix(
CodeAction.Create(
"Inject UNSAFE",
cancellationToken => ApplyFixAsync(context, semanticModel, cancellationToken, objectCreation, parameterSyntax),
nameof(InjectFix)),
diagnostic);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
if (node is IdentifierNameSyntax identifierName &&
identifierName.Parent is MemberAccessExpressionSyntax memberAccess)
{
var type = GU0007PreferInjecting.MemberType(memberAccess, semanticModel, context.CancellationToken);
var parameterSyntax = SyntaxFactory.Parameter(SyntaxFactory.Identifier(ParameterName(type)))
.WithType(SyntaxFactory.ParseTypeName(type.ToDisplayString(SymbolDisplayFormat.MinimallyQualifiedFormat)));
switch (GU0007PreferInjecting.IsInjectable(identifierName, semanticModel, context.CancellationToken))
{
case GU0007PreferInjecting.Injectable.No:
continue;
case GU0007PreferInjecting.Injectable.Safe:
case GU0007PreferInjecting.Injectable.Unsafe:
context.RegisterCodeFix(
CodeAction.Create(
"Inject UNSAFE",
cancellationToken => ApplyFixAsync(context, semanticModel, cancellationToken, identifierName, parameterSyntax),
nameof(InjectFix)),
diagnostic);
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
}
private static async Task <Document> ApplyFixAsync(CodeFixContext context, SemanticModel semanticModel, CancellationToken cancellationToken, ExpressionSyntax expression, ParameterSyntax parameterSyntax)
{
if (GU0007PreferInjecting.TrySingleConstructor(expression, out var ctor))
{
var editor = await DocumentEditor.CreateAsync(context.Document, cancellationToken)
.ConfigureAwait(false);
parameterSyntax = UniqueName(ctor.ParameterList, parameterSyntax);
if (expression is ObjectCreationExpressionSyntax)
{
editor.ReplaceNode(expression, SyntaxFactory.IdentifierName(parameterSyntax.Identifier));
}
else if (expression is IdentifierNameSyntax identifierName &&
expression.Parent is MemberAccessExpressionSyntax)
{
var replaceNodes = new ReplaceNodes(identifierName, semanticModel, cancellationToken).Nodes;
if (replaceNodes.Count == 0)
{
return(context.Document);
}
ExpressionSyntax fieldAccess = null;
foreach (var replaceNode in replaceNodes)
{
if (replaceNode.FirstAncestor <ConstructorDeclarationSyntax>() == null)
{
if (fieldAccess == null)
{
fieldAccess = WithField(editor, ctor, parameterSyntax);
}
editor.ReplaceNode(replaceNode, fieldAccess.WithLeadingTrivia(replaceNode.GetLeadingTrivia()));
}
else
{
editor.ReplaceNode(replaceNode, SyntaxFactory.IdentifierName(parameterSyntax.Identifier).WithLeadingTrivia(replaceNode.GetLeadingTrivia()));
}
}
}
else
{
return(context.Document);
}
if (ctor.ParameterList == null)
{
editor.ReplaceNode(ctor, ctor.WithParameterList(SyntaxFactory.ParameterList(SyntaxFactory.SingletonSeparatedList(parameterSyntax))));
}
else
{
if (ctor.ParameterList.Parameters.TryFirst(p => p.Default != null || p.Modifiers.Any(SyntaxKind.ParamsKeyword), out var existing))
{
editor.InsertBefore(existing, parameterSyntax);
}
else
{
editor.ReplaceNode(ctor.ParameterList, ctor.ParameterList.AddParameters(parameterSyntax));
}
}
return(editor.GetChangedDocument());
}