Task <Document> ChangeMagicNumberToIDAsync(CodeFixContext context, Document document, Diagnostic diagnostic, SyntaxNode root)
{
var n = root.FindNode(diagnostic.Location.SourceSpan);
if (n is ArgumentSyntax argument && argument.Expression is LiteralExpressionSyntax)
{
n = argument.Expression;
}
// We expect this to point directly at the NumericLiteralExpression
if (!(n is LiteralExpressionSyntax literalExpressionSyntax && literalExpressionSyntax.IsKind(SyntaxKind.NumericLiteralExpression)))
{
return(Task.FromResult(document));
}
string result = diagnostic.Properties["result"];
NameSyntax name = SyntaxFactory.IdentifierName(result);
name = name.WithLeadingTrivia(literalExpressionSyntax.GetLeadingTrivia()).WithTrailingTrivia(literalExpressionSyntax.GetTrailingTrivia()); // try WithTriviaFrom instead?
var newRoot = root.ReplaceNode(literalExpressionSyntax, name);
var compilationUnitSyntax = newRoot as CompilationUnitSyntax;
var systemThreadingUsingName =
SyntaxFactory.QualifiedName(
SyntaxFactory.IdentifierName("Terraria"),
SyntaxFactory.IdentifierName("ID"));
if (compilationUnitSyntax.Usings.All(u => u.Name.GetText().ToString() != "Terraria.ID"))
{
if (compilationUnitSyntax.Usings.Any())
{
newRoot = newRoot.InsertNodesAfter(compilationUnitSyntax.Usings.Last(), new[] { SyntaxFactory.UsingDirective(systemThreadingUsingName) });
}
else
{
newRoot = compilationUnitSyntax.AddUsings(new[] { SyntaxFactory.UsingDirective(systemThreadingUsingName) });
}
}
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}