async Task <Solution> PerformAction(Document document, SemanticModel model, SyntaxNode root, TypeDeclarationSyntax enclosingTypeDeclaration, INamedTypeSymbol declaringTypeSymbol, MethodDeclarationSyntax methodDeclaration, IMethodSymbol methodSymbol, CancellationToken cancellationToken)
{
// Collect all invocations of changed method
var methodReferencesVisitor = new MethodReferencesVisitor(document.Project.Solution, methodSymbol, methodDeclaration, cancellationToken);
await methodReferencesVisitor.Collect();
// Collect all references to type members and "this" expressions inside of changed method
var memberReferencesVisitor = new MemberReferencesVisitor(model, declaringTypeSymbol.GetMembers().Where(m => m != methodSymbol), cancellationToken);
memberReferencesVisitor.Collect(methodDeclaration.Body);
Solution solution = document.Project.Solution;
List <SyntaxNode> trackedNodesInMainDoc = new List <SyntaxNode>();
trackedNodesInMainDoc.Add(methodDeclaration);
var methodReferencesInMainDocument = methodReferencesVisitor.NodesToChange.FirstOrDefault(n => n.Document.Id == document.Id);
if (methodReferencesInMainDocument != null)
{
trackedNodesInMainDoc.AddRange(methodReferencesInMainDocument.References.Select(r => r.InvocationExpression));
}
trackedNodesInMainDoc.AddRange(memberReferencesVisitor.NodesToChange);
var newMainRoot = root.TrackNodes(trackedNodesInMainDoc);
foreach (var invocationsInDocument in methodReferencesVisitor.NodesToChange)
{
SyntaxNode thisDocRoot = null;
var thisDocumentId = invocationsInDocument.Document.Id;
if (document.Id == thisDocumentId)
{
// We are in same document as changed method declaration, reuse new root from outside
thisDocRoot = newMainRoot;
}
else
{
thisDocRoot = await invocationsInDocument.Document.GetSyntaxRootAsync();
if (thisDocRoot == null)
{
continue;
}
thisDocRoot = thisDocRoot.TrackNodes(invocationsInDocument.References.Select(r => r.InvocationExpression));
}
foreach (var referencingInvocation in invocationsInDocument.References)
{
// Change this method invocation to invocation of a static method with instance parameter
var thisInvocation = thisDocRoot.GetCurrentNode(referencingInvocation.InvocationExpression);
ExpressionSyntax invocationExpressionPart = null;
SimpleNameSyntax methodName = null;
var memberAccessExpr = thisInvocation.Expression as MemberAccessExpressionSyntax;
if (memberAccessExpr != null)
{
invocationExpressionPart = memberAccessExpr.Expression;
methodName = memberAccessExpr.Name;
}
if (invocationExpressionPart == null)
{
var identifier = thisInvocation.Expression as IdentifierNameSyntax;
if (identifier != null)
{
// If changed method references itself, use "instance" as additional parameter! In other methods of affected class, use "this"!
if (referencingInvocation.IsInChangedMethod)
{
invocationExpressionPart = SyntaxFactory.IdentifierName("instance").WithLeadingTrivia(identifier.GetLeadingTrivia());
}
else
{
invocationExpressionPart = SyntaxFactory.ThisExpression().WithLeadingTrivia(identifier.GetLeadingTrivia());
}
methodName = identifier;
}
}
if (invocationExpressionPart == null)
{
continue;
}
List <ArgumentSyntax> invocationArguments = new List <ArgumentSyntax>();
invocationArguments.Add(SyntaxFactory.Argument(invocationExpressionPart.WithoutLeadingTrivia()));
invocationArguments.AddRange(referencingInvocation.InvocationExpression.ArgumentList.Arguments);
thisDocRoot = thisDocRoot.ReplaceNode(
thisInvocation,
SyntaxFactory.InvocationExpression(
SyntaxFactory.MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
SyntaxFactory.IdentifierName(enclosingTypeDeclaration.Identifier.WithoutTrivia()).WithLeadingTrivia(invocationExpressionPart.GetLeadingTrivia()),
methodName.WithoutLeadingTrivia()
),
SyntaxFactory.ArgumentList(SyntaxFactory.SeparatedList(invocationArguments)).WithAdditionalAnnotations(Formatter.Annotation)
));
}
if (document.Id == thisDocumentId)
{
// Write new root back to outside
newMainRoot = thisDocRoot;
}
else
{
// Another document, replace it with modified version in solution
solution = solution.WithDocumentSyntaxRoot(thisDocumentId, thisDocRoot);
}
}
foreach (var changedNode in memberReferencesVisitor.NodesToChange)
{
var trackedNode = newMainRoot.GetCurrentNode(changedNode);
var thisExpression = trackedNode as ThisExpressionSyntax;
if (thisExpression != null)
{
// Replace "this" with instance parameter name
newMainRoot = newMainRoot.ReplaceNode(
thisExpression,
SyntaxFactory.IdentifierName("instance").WithLeadingTrivia(thisExpression.GetLeadingTrivia())
);
}
var memberIdentifier = trackedNode as IdentifierNameSyntax;
if (memberIdentifier != null)
{
newMainRoot = newMainRoot.ReplaceNode(
memberIdentifier,
SyntaxFactory.MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
SyntaxFactory.IdentifierName("instance").WithLeadingTrivia(memberIdentifier.GetLeadingTrivia()),
memberIdentifier.WithoutLeadingTrivia())
);
}
}
List <ParameterSyntax> parameters = new List <ParameterSyntax>();
parameters.Add(SyntaxFactory.Parameter(
SyntaxFactory.List <AttributeListSyntax>(),
SyntaxFactory.TokenList(),
SyntaxFactory.ParseTypeName(enclosingTypeDeclaration.Identifier.ValueText),
SyntaxFactory.Identifier("instance"), null)
.WithAdditionalAnnotations(Formatter.Annotation));
parameters.AddRange(methodDeclaration.ParameterList.Parameters);
var staticModifierLeadingTrivia =
methodDeclaration.Modifiers.Any() ? SyntaxFactory.TriviaList() : methodDeclaration.GetLeadingTrivia();
var methodDeclarationLeadingTrivia =
methodDeclaration.Modifiers.Any() ? methodDeclaration.GetLeadingTrivia() : SyntaxFactory.TriviaList();
var trackedMethodDeclaration = newMainRoot.GetCurrentNode(methodDeclaration);
newMainRoot = newMainRoot.ReplaceNode((SyntaxNode)trackedMethodDeclaration, trackedMethodDeclaration
.WithLeadingTrivia(methodDeclarationLeadingTrivia)
.WithModifiers(trackedMethodDeclaration.Modifiers.Add(SyntaxFactory.Token(SyntaxKind.StaticKeyword).WithLeadingTrivia(staticModifierLeadingTrivia).WithTrailingTrivia(SyntaxFactory.TriviaList(SyntaxFactory.Whitespace(" ")))))
.WithParameterList(SyntaxFactory.ParameterList(SyntaxFactory.SeparatedList(parameters)).WithTrailingTrivia(trackedMethodDeclaration.ParameterList.GetTrailingTrivia())));
return(solution.WithDocumentSyntaxRoot(document.Id, newMainRoot));
}