Currently, the feature file parser always resolves included files,
parses their content and inserts it in the resulting AST. The original
`include` statement is lost.
This commit introduces an option to not follow inclusions. Instead, the
output AST will contain an `include` statement. This allows to process a
feature file on its own, and allows to round-trip it.
For example in glyphsLib, when going from a UFO to a .glyphs file, a
UFO feature file will be sliced up into Glyphs.app classes (e.g. a
GSFeaturePrefix with code `include(../family.fea);`) and when going back
from .glyphs to UFO, the feature file will be patched back together.
same as harfbuzz hb_script_get_horizontal_direction.
We just hard-code the set of RTL script here, as it doesn't change often anyway.
The function is just syntactic sugar as it all does is basically looking up the
constant RTL_SCRIPTS set.
It's nice to have it here in a central place alongside 'script', 'script_name', etc.
The split-glyf-to-one-glyph-per-file feature is only partially implemented,
as it was discussed here:
https://github.com/fonttools/fonttools/issues/153#issuecomment-346677171
I need to cut a bugfix release today, but I don't want to ship this as is.
I prefer to temporarily rever, tag a release from master branch, then
revert it again to its present state so that bamidei can complete his
work.
---
Revert "[glyf] make splitGlyphs output more compact"
This reverts commit d08d635a93289982b028aacd3b9039fbe742f3e8.
Revert "more whitespace"
This reverts commit bd030f61c6b360fd360632bbc6c19abb057c9a24.
Revert "minor whitespace"
This reverts commit f2a8c787b13b92ae0e0f61477e584316144747c7.
Revert "Merge pull request #1035 from bamidei/split_g_l_y_f_to_one_per_file"
This reverts commit 17b89d9dde7691dbbb6815efba92eff446af62ac, reversing
changes made to b8482d9666f08d3603ee93d3ca52931550f715fc.
`script_code` does the reverse of `script_name`: it takes a long
script name and returns a 4-letter script code.
Both `script_name` and `script_code` raise KeyError by default,
but can optionally return a default value instead.
As Martin Hosken reported in https://github.com/fonttools/fonttools/pull/1096,
feaLib currently incorrectly handles the case where a marked input
glyph sequence in a contextual chaining sub/pos rule is split into
multiple runs, rather than being a single continuous run of ' marked
glyphs.
The consensus there was to raise a syntax error like makeotf instead of
second-guessing and silently fixing it like fontforge does.
... instead of a glyphMap dict.
The parser does not actually need a reverse glyph order mapping as
it is not interested in knowing the glyphID from the glyph name,
but only whether a glyph is in the font or not.
This makes it easier for client code (e.g. ufo2ft feature compiler)
to use the feaLib Parser, without having to first construct and pass
it a glyphMap argument.
In OT kern subtable header, the format is the high byte of 'coverage'
bit mask (bits 8-15), and the low byte (bits 0-7) is the actual coverage
bits.
In AAT kern, it's the opposite: the coverage flags are the high byte,
whereas the subtable format is the low byte.
Also adjusted the test data, and set coverage to 1 for OT kern subtable
(which means the usual horizontal kerning).
