private void CreateDelegateDeclaration(Document document, FuncOrAction funcOrAction, IParameterSymbol parameterSymbol, out string newDelegateName, out DelegateDeclarationSyntax delegateDeclaration)
{
var syntaxGenerator = SyntaxGenerator.GetGenerator(document);
var parameters = funcOrAction switch
{
FuncOrAction.Action action => action.Parameters,
FuncOrAction.Func func => func.Parameters,
_ => throw new System.NotImplementedException()
};
newDelegateName = MakeFirstLetterUpperCase(parameterSymbol.Name);
delegateDeclaration = (DelegateDeclarationSyntax)syntaxGenerator.DelegateDeclaration(
newDelegateName,
parameters
.Select(p => syntaxGenerator.ParameterDeclaration(
p.Name,
syntaxGenerator.TypeExpression(p.Type))),
accessibility: Accessibility.Public);
if (funcOrAction is FuncOrAction.Func func1)
{
delegateDeclaration = delegateDeclaration
.WithReturnType((TypeSyntax)syntaxGenerator.TypeExpression(func1.ReturnType));
}
}
private async Task <Document> UpdateDocumentToAddAndUseANewDelegate(
Document document,
FuncOrAction funcOrAction,
ParameterSyntax parameterSyntax,
IParameterSymbol parameterSymbol,
SemanticModel semanticModel)
{
var syntaxGenerator = SyntaxGenerator.GetGenerator(document);
var parameters = funcOrAction switch
{
FuncOrAction.Action action => action.Parameters,
FuncOrAction.Func func => func.Parameters,
_ => throw new System.NotImplementedException()
};
var newDelegateName = MakeFirstLetterUpperCase(parameterSymbol.Name);
var delegateDeclaration = (DelegateDeclarationSyntax)syntaxGenerator.DelegateDeclaration(
newDelegateName,
parameters
.Select(p => syntaxGenerator.ParameterDeclaration(
p.Name,
syntaxGenerator.TypeExpression(p.Type))),
accessibility: Accessibility.Public);
if (funcOrAction is FuncOrAction.Func func1)
{
delegateDeclaration = delegateDeclaration
.WithReturnType((TypeSyntax)syntaxGenerator.TypeExpression(func1.ReturnType));
}
var method = (MethodDeclarationSyntax)parameterSyntax.Parent.Parent;
var updatedMethod = method.ReplaceNode(parameterSyntax.Type,
SyntaxFactory.IdentifierName(newDelegateName));
var root = await document.GetSyntaxRootAsync();
var containingType = (TypeDeclarationSyntax)method.Parent;
var indexOfMethodWithinSiblingMembers = containingType.Members.IndexOf(method);
var updatedRoot = root.ReplaceNodes(new SyntaxNode[] { method, containingType },
(originalNode, possiblyChangedNode) =>
{
if (originalNode == method)
{
return(updatedMethod);
}
else if (originalNode == containingType)
{
var possibleChangedContainingType = (TypeDeclarationSyntax)possiblyChangedNode;
var newMembers = possibleChangedContainingType.Members.Insert(
indexOfMethodWithinSiblingMembers,
delegateDeclaration);
return(possibleChangedContainingType.WithMembers(SyntaxFactory.List(newMembers)));
}
throw new System.Exception("Unexpected: originalNode is not any of the nodes passed to ReplaceNodes");
});
return(document.WithSyntaxRoot(updatedRoot));
}