ToxicFrog/Ligaturizer
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Generate ignore sub tables to constrain ligature conversion.

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This matches the behaviour of Fira Code, where long runs of identical
characters don't get ligaturized; for example, with this change,
`######` will get ligaturized as six `#` characters, rather than as
three `##` characters.
This commit is contained in:
Ben Kelly 2018-01-18 10:30:49 -05:00 committed by Ben Kelly
parent f711794def
commit 9df424631a
1 changed files with 32 additions and 7 deletions
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39
ligaturize.py
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@ -85,7 +85,6 @@ class LigatureCreator(object):
except ValueError:
return False
def add_ligature(self, input_chars, firacode_ligature_name):
if firacode_ligature_name is None:
# No ligature name -- we're just copying a bunch of individual characters.
@ -137,16 +136,42 @@ class LigatureCreator(object):
calt_lookup_name = 'calt.{}'.format(self._lig_counter)
self.font.addLookup(calt_lookup_name, 'gsub_contextchain', (), (('calt', (('DFLT', ('dflt',)), ('arab', ('dflt',)), ('armn', ('dflt',)), ('cyrl', ('SRB ', 'dflt')), ('geor', ('dflt',)), ('grek', ('dflt',)), ('lao ', ('dflt',)), ('latn', ('CAT ', 'ESP ', 'GAL ', 'ISM ', 'KSM ', 'LSM ', 'MOL ', 'NSM ', 'ROM ', 'SKS ', 'SSM ', 'dflt')), ('math', ('dflt',)), ('thai', ('dflt',)))),))
self.font.addLookup(calt_lookup_name, 'gsub_contextchain', (),
(('calt', (('DFLT', ('dflt',)),
('arab', ('dflt',)),
('armn', ('dflt',)),
('cyrl', ('SRB ', 'dflt')),
('geor', ('dflt',)),
('grek', ('dflt',)),
('lao ', ('dflt',)),
('latn', ('CAT ', 'ESP ', 'GAL ', 'ISM ', 'KSM ', 'LSM ', 'MOL ', 'NSM ', 'ROM ', 'SKS ', 'SSM ', 'dflt')),
('math', ('dflt',)),
('thai', ('dflt',)))),))
#print('CALT %s (%s)' % (calt_lookup_name, firacode_ligature_name))
for i, char in enumerate(input_chars):
ctx_subtable_name = 'calt.{}.{}'.format(self._lig_counter, i)
ctx_spec = '{prev} | {cur} @<{lookup}> | {next}'.format(
self.add_calt(calt_lookup_name, 'calt.{}.{}'.format(self._lig_counter, i),
'{prev} | {cur} @<{lookup}> | {next}',
prev = ' '.join(cr_name(j) for j in range(i)),
cur = char,
lookup = lookup_name(i),
next = ' '.join(input_chars[i+1:]),
)
self.font.addContextualSubtable(calt_lookup_name, ctx_subtable_name, 'glyph', ctx_spec)
next = ' '.join(input_chars[i+1:]))
# Add ignore rules
self.add_calt(calt_lookup_name, 'calt.{}.{}'.format(self._lig_counter, i+1),
'| {first} | {rest} {last}',
first = input_chars[0],
rest = ' '.join(input_chars[1:]),
last = input_chars[-1])
self.add_calt(calt_lookup_name, 'calt.{}.{}'.format(self._lig_counter, i+2),
'{first} | {first} | {rest}',
first = input_chars[0],
rest = ' '.join(input_chars[1:]))
def add_calt(self, calt_name, subtable_name, spec, **kwargs):
spec = spec.format(**kwargs)
#print(' %s: %s ' % (subtable_name, spec))
self.font.addContextualSubtable(calt_name, subtable_name, 'glyph', spec)
def change_font_names(font, fontname, fullname, familyname, copyright_add, unique_id):