New to Typophile? Accounts are free, and easy to set up.
When I was coding features for Frode (Automatic indexed numerals), I have noted, that they only work, if I put the substitution rules into lookups. In case of the ss01 feature, I need at least one lookup, because I wanted to make use of the same rules in the ss02 feature. But I absolutely don’t know, why it was required to create more than one lookup in the ss01 feature. And in case of the calt feature my consideration was, that I don’t need lookups at all. So I would like to know, why the ss01 and the calt feature don’t work without lookups and how I can determine, how many lookups I need and how many rules I can put into a lookup. With regard to the lookups the three feature files are the result of try and error, but this is not an effective working method, because it costs time and additionally I am not sure, whether my lookups are the best way with regard to the compilation or compression of the font (the aesthetic of the code).
And another thing, that I don’t understand is, why I cannot call a lookup more than one time (where the one time is the definition itself) in a feature. With regard to that question have a view into 2_Features [alternative ss01 and ss02].fea_.txt.
Here are all the three files (They work exactly as intended; tested in FLS.):