[PATCH] fdo#50950 modify calc functions WEEKNUM(_ADD) to comply with ODFF1.2

[Winfried Donkers]

Hi Eike,

> > One important matter  is still open:
> > When opening calc-documents that use the 'old' functions, they are not
> > always computed correctly. The 'new' functions differ in paramter
> > count.
> > I do not know where to add code for backward compatibility when
> > opening these documents, but with some help/hints I might be able to
> > fix that.
> 
> There are three cases to be considered:
> 
> 1. reading ODF 1.2 (ODFF)
> 2. writing ODF 1.0/1.1 (PODF)
> 3. reading ODF 1.0/1.1 (PODF)
> [...]

I'm afraid I'm lost here. I can't find my way in/around FormulaCompiler::Factor().
To put it simple: with respect to calc-formulas I understand what the user sees and I (often) understand what's happening in ScInterpreter. But the bit inbetween as rather foggy for me. And to be honest, I doubt if a thorough study of that area will help me much.
So I've got another three cases to consider :-/
1. Give up fdo50950 - I don't like this option, not vanity but I would the functions itself to be available in LibO
3. Get some help from co-developers who are familiar with this kind of poking - that would be nice, but is out of my control
2. Struggle on in the hope of magically getting there - this will be the default as I don't like case 1

I will see that the submodules are included in the patch sofar that I attached to the bug itself and concentrate on other bugs (like IFERROR/IFNA/NUMBERVALUE).

Winfried