string ConvertHelper(AstNode node, Action<CSharpCodeProvider, CodeObject, TextWriter, CodeGeneratorOptions> action)
{
CSharpResolver resolver = new CSharpResolver(compilation);
resolver = resolver.WithCurrentUsingScope(parsedFile.RootUsingScope.Resolve(compilation));
resolver = resolver.WithCurrentTypeDefinition(compilation.FindType(KnownTypeCode.Object).GetDefinition());
var codeObj = convertVisitor.Convert(node, new CSharpAstResolver(resolver, node));
StringWriter writer = new StringWriter();
writer.NewLine = " ";
action(new CSharpCodeProvider(), codeObj, writer, new CodeGeneratorOptions { IndentString = " " });
return Regex.Replace(writer.ToString(), @"\s+", " ").Trim();
}