Currently unused but will be super helpful for optimizing the formats of contextual lookups.
* Splits the rules of a class contextual lookup based on explicit subtable breaks
* Returns various properties on the ruleset to help determine appropriate layout format.
* (More properties, such as "touched glyphs", planned - will be added when needed.)
Document otlLib
Includes other minor changes:
* When a markFilterSet parameter is passed to a builder, LOOKUP_FLAG_USE_MARK_FILTERING_SET will be added to the lookup's flags.
* The unused arguments valueformat1 and valueformat2 were removed from ClassPairPosSubtableBuilder.
Refactors feaLib, moving code which builds OpenType lookups into otlLib. Note that this changes feaLib's concept of `location` from a tuple to an object.
Fix for #1985:
* ensure that the AxisNameID in the STAT table is not less than 256. This needed an additional argument to the addMultiLingualName() name table method.
* fvar axis name IDs must also not be less than 256, just like STAT axis names.
Adds __str__() method to ast classes that writes back VOLT data. Tries
to replicate VOLT syntax idiosyncrasies as much as possible for better
round-trip conversion.
This makes the directory to search for included files explicit.
Also use Python 3's FileNotFoundError to catch non-existant files instead of a workaround for Python 2.
* when reading from binary, name.string may be an encoded bytes sequence: we should call toUnicode() before we compare to the requested string
* fix expected output
* Allow feature variations to be active across the entire space
* Add test with empty condition set
* Skip initial box instead of removing it
* Correct comment
This allows for more than one "lookup ..." chaining statements at each glyph position in a chaining contextual substitution or positioning rule: e.g.
sub a b c' lookup lookup1 lookup lookup2 d;
The corresponding change in the Adobe OpenType Feature File Specification (and implementation in makeotf) happened in adobe-type-tools/afdko#1132.
* add nameTable.findMultilingualName(), to find an existing multilingual name
* Make addMultilingualName() reuse nameIDs if possible when asking for a new nameID, by calling findMultilingualName()
Support was added in db49f20d6b2629e1ba25c4afd3fb60817387f3d6, but there
was only a parser test and no builder test, fix the build and add a
builder test based on the existing parser one.
Fixes https://github.com/fonttools/fonttools/issues/1901
