I want to have a different version for a letter everytime you type the letter.
For example if you type a A and 30 letters later you type a A again then it should be the A.1 version.

A——————A.1—————————A.2——-A.3——————A.4

The code would be something like:

sub A @all @all @all A’ by A.1;
sub A @all @all A’ by A.1;
sub A @all A’ by A.1;
sub A A’ by A.1;

And that for every letter and alt version which makes the code really big.

Is it possible to use a lookup for the @all part?
Like this:

sub A’ A’ by A.1;

Where the lookup is used for:

@all;
@all @all;
@all @all @all;
@all @all @all @all;

So the lookup can be easy re-used for the B and C etc. (and A.1 A.2 ...)

Is there a more simple way to archive this?
I tried some things (with different code) but i moslty end up in:

A/A.1/B.2/A.3/A.4/B.5

where i want it to be:
A/A.1/B/A.2/A.3/B.1

Also i can’t get the lookup from the opentype feature file specification to work:

http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.htm...

I get the error:
aborting because of errors:
syntax error at “lookup”