What happened to “release early, release often”?

Since the project started, we’ve been releasing pretty much every 100 commits or so – actually more than that, given 13 releases in 1,003 commits. Our “next” branch stands at 1,375 commits at the time of this writing, and the next release will likely be well beyond the 1,400th commit. What’s up, duck?

Quite a lot actually.

Architecture changes

Since the 1.3 pre-release, we have moved the unit testing feature into its own project. This means starting with Rubberduck 1.4, upgrading your Rubberduck will not break any references because the .tlb will remain the same unless there are changes to the unit testing feature.


We’ve been working on extracting every single hard-coded UI string literal into resource files, and proceeded to translate them. The French translation is pretty much done, and we’ve been promised a Swedish translation. Surely more translations will be added in future versions. Rubberduck’s UI language will be selectable from a dropdown in the options dialog.

Grammar is fun

Our ANTLR grammar has undergone yet another little tune-up, which fixes a number of annoyances. And when our grammar fails, we’re now going to be showing you exactly where and why it’s failing, and you can double-click the error to navigate there.


We already had the Code Explorer doing a great job with navigation, but v1.4 takes navigation totally elsewhere, by letting you locate all references to any identifier (including built-in constants, enums, functions, modules, etc.), and all implementations of any implemented interface class – this latter functionality is an awesome tool if you’re into coding against abstractions… which happens to be a great way to write unit-testable code.

But that’s not all: a find symbol functionality lets you search for literally anything, from variables to constants, procedures, modules, function parameters, …even subroutine line labels.


Parsing a relatively large VBA project, and resolving all rerences to all identifiers, can take a little while. Instead of just freezing up the IDE while Rubberduck is working on that, we’re now going to be displaying a little progress dialog, showing you exactly what’s going on – and we only parse and resolve references for modules that have been modified since the last parse, so we’re doing everything we can to keep that waiting time to a minimum.

Moreover, the Code Explorer and Code Inspections now work on a background thread, so you can continue browsing your project while Rubberduck is parsing/resolving/inspecting – keep in mind though, that if you modify the code while it’s being inspected, you’re likely to get stale inspection results… and that’s not a bug.


1.3 introduced a rename refactoring, on top of the extract method introduced in 1.2; well guess what, 1.4 fixes a number of issues in both, and introduces brand new ones! You will be able to reorder parameters in any procedure, and automatically update all usages; or remove a parameter in a signature, and automatically update all call sites.

Source Control

It’s almost done. Most of it is already committed to our [next] branch, so 1.4 isn’t shipping without this feature – GitHub integrated source control for VBA. No, it’s not a joke.

So yeah, there’s a lot going on, and it’s all coming in the next release of Rubberduck. And more awesome features are coming up for 2.0; follow us on Twitter, and stay tuned!


You’ve waited long enough.

The wait is over!

I have to say that this release has been… exhausting. Correctly resolving identifier references has proven to be much, much more complicated than I had originally anticipated. VBA has multiple ways of making this hard: with blocks are but one example; user-defined-type fields are but another.

But it’s done. And as far as I could tell, it works.

Why did you tag it as “pre-release” then?

Because resolving identifier references in VBA is hard, and what I released is not without issues; it’s not perfect and still needs some work, but I believe most normal use cases are covered.

For example, this code will blow up with a wonderful StackOverflowException:


Public Function Foo() As Class2
    Set Foo = New Class2
End Function


Public Sub Foo()
End Sub


Public Sub DoSomething()
    Dim Foo As New Class1
    With Foo
    End With
End Sub

It compiles, VBA resolves it. And it’s fiendish, and nobody in their right minds would do anything near as ambiguous as that. But it’s legal, and it blows up.

That’s why I tagged it as a “pre-release”: because there are a number of hair-pulling edge cases that just didn’t want to cooperate.

See, finding all references to “foobar” works very well here:

Public Sub DoSomething()
    Dim foobar As New Class1
    With foobar
        With .Foo
        End With
    End With
End Sub

…and finding all references to “Foo” in the below code will not blow up, but the “.Foo” in the 2nd with block resolves as a reference to the local variable “Foo”:

Public Sub DoSomething()
    Dim Foo As New Class1
    With Foo
        With .Foo
        End With
    End With
End Sub

And of course, there are a number of other issues still.

Here’s a non-exhaustive list of relatively minor known issues we’re postponing to 1.31 or other future release – please don’t hesitate to submit a new issue if you find anything that doesn’t work as you’d expect.

There can be only one

Rubberduck doesn’t [yet] handle cross-project references; while all opened VBA projects are parsed and navigatable, they’re all “silos”, as project references aren’t taken into account; this means if project A is referencing project B, and project A contains the only usage of a procedure defined in project B, then that procedure will fire up a code inspection saying the procedure is never used.

It also means “find all references” and “rename” will miss it.

self-referencing Parameters

“Find all references” has been seen listing the declaration of a parameter in its list of references. Not a biggie, but not intended either. There’s no explanation for that one, yet – in fact it’s possible you never even encounter this issue.

Selection Glitches From Code Inspection Results

We know what causes it: the length of the selection is that of the last word/token in the parser context associated with the inspection result. That’s like 80% fixed! Now the other 80% is a little bit tricky…


Code inspections were meant to get faster. They got more accurate instead. This needs a tune-up. You can speed up inspections by turning off the most expensive ones… although these are often the most useful ones, too.

Function return vAlue not assigned

There has been instances of [hard-to-repro] object-typed property getters that fire up an inspection result, when they shouldn’t. Interestingly this behavior hasn’t been reproduced in smaller projects. This inspection is important because a function (or property getter) that’s not assigned, will not return anything – and that’s more than likely a bug waiting to be discovered.

Parameter can be passed by value

This inspection is meant to indicate that a ByRef parameter is not assigned a value, and could safely be passed ByVal. However if such a parameter is passed to another procedure as a ByRef parameter, Rubberduck should assume that the parameter is assigned. That bit is not yet implemented, so that inspection result should be taken with a grain of salt (like all code inspection results in any static code analysis tool anyway).

This inspection will not fire up a result if the parameter isn’t a primitive type, for performance reason (VBA performance); if performance is critical for your VBA code, passing parameters by reference may yield better results.

Special Thanks to Rob Bovey and Stephen Bullen

Twitter is awesome: you share something with the world, and then the world shares something with you. Thanks to the awesomeness of Ross McLean, we are pleased to announce that Rubberduck 2.0 will include automagic indentation

…Powered by smart indenter

Yes! The original author and current maintainer of the magic indenting freeware tool downloaded by dozens of thousands of happy customers have kindly supplied us with the VB6 source code, and we’re going to put it to good use, port it to .NET, embed the almighty indentation algorithm into Rubberduck, and try to keep as much as possible of the formidable set of configuration settings that make Smart Indenter such a wonder.

To be continued…