Font Forum

I have created two Classes in Open Type Designer. One called '@Basic_Base' which contains a list of all the base characters which have all the anchors. The other is called '@Cyrillic_Base' which contains a list of Cyrillic characters which have a restricted set of anchors.

Whenever I open the code in the Code Editor it replaces these two classes with one class called '@M2B_B__A' which seems to be a merge between the two classes it replaces. A syntax check complains that there are one or more unreferenced classes (which are the ones it has replaced).
What is going on here ?

Can I not place more than one class into the Mark to Base open type feature ?

Positioning code doesn't use all classes as shown in the OpenType Designer. Only classes that are actually used within the OpenType feature code will be compiled into the font.

I created two classes with names I could understand.
When exported to a font the diacritic marks are correctly positioned in Libre Office and Page Plus.

If I open Code Editor it discards my named classes and creates a new class with a name which to me is less understandable without asking. Then brings up a warning about unused classes.
If exported to a font the diacritic marks are correctly positioned in Libre Office, I have not tested them in Page Plus but there is no reason to suppose they will not work there as well.

The point is that opening Code Editor re-writes my code in ways I did not expect.

That is exactly what I tried to confirm. Source and Binary are not 100% exchangeable. Right now there is not much we can do about it, as it is by design.

If you open a font with OpenType features and recompile it, you'll notice FontCreator is actually very smart at finding and eliminating irrelevant parts of OpenType layout features that are never used within a font.

So it combines the classes, I can live with that. Sorry to cause a fuss.

No problem. I didn't understand what it was doing and why.

I'm not saying it combines them; I'm just saying it tries to be smart