def action(self, args):
(pre, l, r, post) = args[0]
left = l.resolve(self.parser.fontfeatures, self.parser.font)
right = r.resolve(self.parser.fontfeatures, self.parser.font)
precontext = None
postcontext = None
if pre:
precontext = [
g.resolve(self.parser.fontfeatures, self.parser.font)
for g in pre
]
if post:
postcontext = [
g.resolve(self.parser.fontfeatures, self.parser.font)
for g in post
]
lefttoright = fontFeatures.Routine(
rules=[fontFeatures.Substitution([left], [right])])
righttoleft = fontFeatures.Routine(
rules=[fontFeatures.Substitution([right], [left])])
return [
fontFeatures.Chaining(
[left, right],
lookups=[[lefttoright], [righttoleft]],
precontext=precontext,
postcontext=postcontext,
)
]
def store(self, parser, tokens):
from glyphtools import determine_kern, bin_glyphs_by_metric
import fontFeatures
import itertools
units = int(tokens[-1].token)
kerns = []
bincount = 5
lefts = parser.expandGlyphOrClassName(tokens[0].token)
rights = parser.expandGlyphOrClassName(tokens[1].token)
def make_kerns(rise=0, context=[], direction="LTR"):
kerns = []
for l in lefts:
for r in rights:
if direction == "LTR":
kern = determine_kern(parser.font,
l,
r,
units,
offset1=(0, rise))
else:
kern = determine_kern(parser.font,
r,
l,
units,
offset1=(0, rise))
if abs(kern) < 5:
continue
v = fontFeatures.ValueRecord(xAdvance=kern)
kerns.append(
fontFeatures.Positioning([[r]], [v],
precontext=[[l]],
postcontext=context))
return kerns
context = [
parser.expandGlyphOrClassName(x.token) for x in tokens[2:-1]
]
if len(context) == 0:
return [fontFeatures.Routine(rules=make_kerns())]
kerns = []
binned_contexts = [
bin_glyphs_by_metric(parser.font,
glyphs,
"rise",
bincount=bincount) for glyphs in context
]
for c in itertools.product(*binned_contexts):
totalrise = sum([x[1] for x in c])
precontext = [x[0] for x in c]
kerns.extend(
make_kerns(totalrise, context=precontext, direction="RTL"))
return [fontFeatures.Routine(rules=kerns)]
def action(self, args):
parser = self.parser
bincount = 5
lefts, rights, units, pre = args[0]
lefts = lefts.resolve(parser.fontfeatures, parser.font)
rights = rights.resolve(parser.fontfeatures, parser.font)
pre = [g.resolve(parser.fontfeatures, parser.font) for g in pre]
def make_kerns(rise=0, context=[], direction="LTR"):
kerns = []
for l in lefts:
for r in rights:
if direction == "LTR":
kern = determine_kern(parser.font,
l,
r,
units,
offset1=(0, rise))
else:
kern = determine_kern(parser.font,
r,
l,
units,
offset1=(0, rise))
if abs(kern) < 5:
continue
v = fontFeatures.ValueRecord(xAdvance=kern)
kerns.append(
fontFeatures.Positioning([[r]], [v],
precontext=[[l]],
postcontext=context))
return kerns
if not pre:
return [fontFeatures.Routine(rules=make_kerns())]
kerns = []
binned_contexts = [
bin_glyphs_by_metric(parser.font,
glyphs,
"rise",
bincount=bincount) for glyphs in pre
]
for c in itertools.product(*binned_contexts):
totalrise = sum([x[1] for x in c])
precontext = [x[0] for x in c]
kerns.extend(
make_kerns(totalrise, context=precontext, direction="RTL"))
return [fontFeatures.Routine(rules=kerns)]
def action(self, args):
(routinename, statements, flags_languages) = args
flags, languages = flags_languages
if routinename is not None:
routinename = routinename[0].value
if flags is None: flags = []
if not statements:
rr = fontFeatures.RoutineReference(name = routinename)
return [rr]
r = fontFeatures.Routine()
if routinename:
r.name = routinename
r.rules = []
for res in self.parser.filterResults(statements):
if isinstance(res, fontFeatures.Routine):
r.rules.extend(res.rules)
else:
r.rules.append(res)
r.flags = 0
for f in flags:
if isinstance(f, tuple):
r.flags |= f[0]
if f[0] == 0x10:
r.markFilteringSet = f[1].resolve(self.parser.fontfeatures, self.parser.font)
elif f[0] == 0xFF00:
r.markAttachmentSet = f[1].resolve(self.parser.fontfeatures, self.parser.font)
else:
r.flags |= f
r.languages = languages
if not self.parser.current_feature:
self.parser.fontfeatures.routines.append(r)
return [r]
def unparseMarkToLigature(self, lookup):
"""Turn a GPOS5 (mark to ligature) subtable into a fontFeatures Routine."""
b = fontFeatures.Routine(name=self.getname("MarkToLigature" +
self.gensym()))
self._fix_flags(b, lookup)
self.unparsable(b, "Mark to lig pos", lookup)
return b, []
def unparseCursiveAttachment(self, lookup):
"""Turn a GPOS3 (cursive attachment) subtable into a fontFeatures Routine."""
b = fontFeatures.Routine(name=self.getname("CursiveAttachment" + self.gensym()))
self._fix_flags(b, lookup)
entries = {}
exits = {}
for s in lookup.SubTable:
assert s.Format == 1
for glyph, record in zip(s.Coverage.glyphs, s.EntryExitRecord):
if record.EntryAnchor:
entries[glyph] = (
record.EntryAnchor.XCoordinate,
record.EntryAnchor.YCoordinate,
)
if record.ExitAnchor:
exits[glyph] = (
record.ExitAnchor.XCoordinate,
record.ExitAnchor.YCoordinate,
)
b.addRule(
fontFeatures.Attachment(
"cursive_entry",
"cursive_exit",
entries,
exits,
flags=lookup.LookupFlag,
address=self.currentLookup,
)
)
return b, []
def action(self, parser, routinename, tail):
if not tail:
rr = fontFeatures.RoutineReference(name=routinename)
return [rr]
statements, flags = tail
r = fontFeatures.Routine()
if routinename:
r.name = routinename
r.rules = []
for res in parser.filterResults(statements):
if isinstance(res, fontFeatures.Routine):
r.rules.extend(res.rules)
else:
r.rules.append(res)
r.flags = 0
for f in flags:
if isinstance(f, tuple):
r.flags |= f[0]
if f[0] == 0x10:
r.markFilteringSet = f[1].resolve(parser.fontfeatures,
parser.font)
elif f[0] == 0xFF00:
r.markAttachmentSet = f[1].resolve(parser.fontfeatures,
parser.font)
else:
r.flags |= f
if not parser.current_feature:
parser.fontfeatures.routines.append(r)
return [r]
def unparseMarkToMark(self, lookup):
"""Turn a GPOS6 (mark to mark) subtable into a fontFeatures Routine."""
b = fontFeatures.Routine(name=self.getname("MarkToMark" + self.gensym()))
self._fix_flags(b, lookup)
for subtable in lookup.SubTable: # fontTools.ttLib.tables.otTables.MarkBasePos
assert subtable.Format == 1
for classId in range(0, subtable.ClassCount):
anchorClassPrefix = "Anchor" + self.gensym()
marks = self._formatMarkArray(
subtable.Mark1Array, subtable.Mark1Coverage, classId
)
bases = self._formatMark2Array(
subtable.Mark2Array, subtable.Mark2Coverage, classId
)
b.addRule(
fontFeatures.Attachment(
anchorClassPrefix,
anchorClassPrefix + "_",
bases,
marks,
font=self.font,
address=self.currentLookup,
flags=lookup.LookupFlag,
force_markmark=True
)
)
return b, []
def unparseSinglePositioning(self, lookup):
"""Turn a GPOS1 (single positioning) subtable into a fontFeatures Routine."""
b = fontFeatures.Routine(name=self.getname("SinglePositioning" + self.gensym()))
self._fix_flags(b, lookup)
for subtable in lookup.SubTable:
if subtable.Format == 1:
spos = fontFeatures.Positioning(
[subtable.Coverage.glyphs],
[self.makeValueRecord(subtable.Value)],
address=self.currentLookup,
flags=lookup.LookupFlag,
)
b.addRule(spos)
else:
# Optimize it later
for g, v in zip(subtable.Coverage.glyphs, subtable.Value):
spos = fontFeatures.Positioning(
[[g]],
[self.makeValueRecord(v)],
address=self.currentLookup,
flags=lookup.LookupFlag,
)
b.addRule(spos)
return b, []
def unparseSingleSubstitution(self, lookup):
b = fontFeatures.Routine(
name=self.getname("SingleSubstitution" + self.gensym())
)
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
if len(sub.mapping) > 5:
k = list(sub.mapping.keys())
v = list(sub.mapping.values())
b.addRule(
fontFeatures.Substitution(
[k], [v], address=self.currentLookup, flags=lookup.LookupFlag
)
)
else:
for k, v in sub.mapping.items():
b.addRule(
fontFeatures.Substitution(
[[k]],
[[v]],
address=self.currentLookup,
flags=lookup.LookupFlag,
)
)
return b, []
def unparseReverseContextualSubstitution(self, lookup):
b = fontFeatures.Routine(
name=self.getname("ReverseContextualSubstitution" + self.gensym())
)
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
prefix = []
outputs = []
suffix = []
if hasattr(sub, "BacktrackCoverage"):
for coverage in reversed(sub.BacktrackCoverage):
prefix.append(coverage.glyphs)
if hasattr(sub, "LookAheadCoverage"):
for i, coverage in enumerate(sub.LookAheadCoverage):
suffix.append(coverage.glyphs)
outputs = [ sub.Substitute ]
inputs = [ sub.Coverage.glyphs ]
b.addRule(
fontFeatures.Substitution(
inputs,
outputs,
prefix,
suffix,
flags=lookup.LookupFlag,
reverse=True
)
)
return b,[]
def action(self, parser, aFrom, aTo, attachtype):
bases = {}
marks = {}
def _category(k):
return parser.fontfeatures.glyphclasses.get(
k, parser.font[k].category)
for k, v in parser.fontfeatures.anchors.items():
if aFrom in v:
bases[k] = v[aFrom]
if aTo in v:
marks[k] = v[aTo]
if attachtype == "marks":
bases = {
k: v
for k, v in bases.items() if _category(k) == "mark"
}
else:
bases = {
k: v
for k, v in bases.items() if _category(k) == "base"
}
if attachtype != "cursive":
marks = {
k: v
for k, v in marks.items() if _category(k) == "mark"
}
return [
fontFeatures.Routine(rules=[
fontFeatures.Attachment(
aFrom, aTo, bases, marks, font=parser.font)
])
]
def action(self, args):
parser = self.parser
(bases, matra, matras) = args
bases = bases.resolve(parser.fontfeatures, parser.font)
matra = matra.resolve(parser.fontfeatures, parser.font)
matras = matras.resolve(parser.fontfeatures, parser.font)
# Organise matras into overhang widths
matras2bases = {}
matrasAndOverhangs = [(m, -parser.font[m].rightMargin) for m in matras]
for b in bases:
w = self.find_stem(parser.font, b)
warnings.warn("Stem location for %s: %s" % (b, w))
(bestMatra, _) = min(matrasAndOverhangs,
key=lambda s: abs(s[1] - w))
if not bestMatra in matras2bases:
matras2bases[bestMatra] = []
matras2bases[bestMatra].append(b)
rv = []
for bestMatra, basesForThisMatra in matras2bases.items():
rv.append(
fontFeatures.Substitution([matra],
postcontext=[basesForThisMatra],
replacement=[[bestMatra]]))
return [fontFeatures.Routine(rules=rv)]
def action(self, args):
parser = self.parser
sequence = args[:-1]
routine = args[-1]
combinations = [
g.resolve(parser.fontfeatures, parser.font) for g in sequence
]
named = [x for x in parser.fontfeatures.routines if x.name == routine]
if len(named) != 1:
raise ValueError("Could not find routine called %s" % routine)
routine = named[0]
janky = fontFeatures.jankyPOS.JankyPos(parser.font, direction="RTL")
col = collidoscope.Collidoscope(
None,
{
"cursive": False,
"faraway": True,
"area": 0.1
},
ttFont=parser.font,
)
col.direction = "RTL"
r = []
clashes = 0
total = reduce(lambda x, y: x * y, [len(x) for x in combinations], 1)
warnings.warn("Enumerating %i sequences" % total)
for element in itertools.product(*combinations):
buf = janky.positioning_buffer(element)
buf = janky.process_fontfeatures(buf, parser.fontfeatures)
glyphs = []
cursor = 0
for info in buf:
g, vr = info["glyph"], info["position"]
offset = beziers.point.Point(cursor + (vr.xPlacement or 0),
vr.yPlacement or 0)
glyphs.append(col.get_positioned_glyph(g, offset))
glyphs[-1]["advance"] = vr.xAdvance
cursor = cursor + vr.xAdvance
overlaps = col.has_collisions(glyphs)
if not overlaps:
continue
clashes = clashes + 1
if clashes >= 0.6 * total:
break
# warnings.warn("Overlap found in glyph sequence %s" % (" ".join(element)))
r.append(
fontFeatures.Chaining([[x] for x in element],
lookups=[[routine] for x in element]))
if clashes >= 0.6 * total:
warnings.warn(
"Most enumerations of sequence overlapped, calling routine on whole sequence instead. This may not be what you want!"
)
r = [
fontFeatures.Chaining(combinations,
lookups=[[routine]
for x in combinations])
]
return [fontFeatures.Routine(rules=r)]
def action(self, args):
overhang_padding, glyphs = args
parser = self.parser
for c in ["inits", "medis"]:
if c not in parser.fontfeatures.namedClasses:
raise ValueError("Please define @%s class before calling")
medis = parser.fontfeatures.namedClasses["medis"]
inits = parser.fontfeatures.namedClasses["inits"]
overhangers = glyphs.resolve(parser.fontfeatures, parser.font)
binned_medis = bin_glyphs_by_metric(parser.font,
medis,
"run",
bincount=8)
binned_inits = bin_glyphs_by_metric(parser.font,
inits,
"run",
bincount=8)
rules = []
maxchainlength = 0
longeststring = []
for yb in overhangers:
entry_anchor = parser.fontfeatures.anchors[yb]["entry"]
overhang = max(
-get_glyph_metrics(parser.font, yb)["rsb"],
get_glyph_metrics(parser.font, yb)["xMax"] - entry_anchor[0],
)
workqueue = [[x] for x in binned_inits]
while workqueue:
string = workqueue.pop(0)
totalwidth = sum([max(x[1], failsafe_min_run) for x in string])
if totalwidth > overhang or len(string) > failsafe_max_length:
continue
adjustment = overhang - totalwidth + int(overhang_padding)
postcontext = [x[0] for x in string[:-1]] + [[yb]]
input_ = string[-1]
example = [input_[0][0]] + [x[0] for x in postcontext]
warnings.warn(
"For glyphs in %s, overhang=%i totalwidth=%i adjustment=%i"
% (example, overhang, totalwidth, adjustment))
maxchainlength = max(maxchainlength, len(string))
rules.append(
fontFeatures.Positioning(
[input_[0]],
[fontFeatures.ValueRecord(xAdvance=int(adjustment))],
postcontext=postcontext,
))
for medi in binned_medis:
workqueue.append([medi] + string)
warnings.warn("Bari Ye collision maximum chain length was %i glyphs" %
maxchainlength)
return [fontFeatures.Routine(rules=rules, flags=8)]
def apply(self):
right = self.matches()
left = self.transform(right)
left2, right2 = [], []
routine = fontFeatures.Routine(name=self.name.title().replace(" ", ""))
for l, r in zip(left, right):
if l in self.glyphnames and r in self.glyphnames:
routine.addRule(fontFeatures.Substitution([[l]], [[r]]))
self.project.fontfeatures.routines.extend([routine])
self.project.fontfeatures.addFeature(self.feature, [routine])
def apply(self):
right = self.matches()
routine = fontFeatures.Routine(name=self.name.title().replace(" ", ""))
for r in right:
left = r.replace(".liga","").split("_")
if r == "fl" or r == "fi":
left = list(r)
if all(l in self.glyphnames for l in left) and r in self.glyphnames:
routine.addRule(fontFeatures.Substitution([ [l] for l in left], [[r]]))
self.project.fontfeatures.routines.extend([routine])
self.project.fontfeatures.addFeature(self.feature, [routine])
def _start_routine(self, location, name):
location = "%s:%i:%i" % (location)
self._discard_empty_routine()
self.currentRoutine = fontFeatures.Routine(name=name, address=location)
if not name:
self.currentRoutine.name = "unnamed_routine_%i" % self.gensym
self.gensym = self.gensym + 1
self.currentRoutineFlag = 0
if self.currentFeature:
reference = self.ff.referenceRoutine(self.currentRoutine)
self.ff.addFeature(self.currentFeature, [reference])
else:
self.ff.routines.append(self.currentRoutine)
def unparseContextual(self, lookup):
b = fontFeatures.Routine(name=self.getname("Contextual" + self._table +
self.gensym()))
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
if sub.Format == 1:
self._unparse_contextual_format1(sub, b, lookup)
elif sub.Format == 2:
self._unparse_contextual_format2(sub, b, lookup)
elif sub.Format == 3:
self._unparse_contextual_format3(sub, b, lookup)
else:
raise ValueError
return b, []
def unparseSingleSubstitution(self, lookup):
"""Turn a GPOS1 (single substitution) subtable into a fontFeatures Routine."""
b = fontFeatures.Routine(name=self.getname("SingleSubstitution" +
self.gensym()))
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
for k, v in sub.mapping.items():
b.addRule(
fontFeatures.Substitution(
[[k]],
[[v]],
address=self.currentLookup,
flags=lookup.LookupFlag,
))
return b, []
def unparseChainedContextual(self, lookup):
"""Handles a generic chained contextual lookup, in various formats."""
b = fontFeatures.Routine(name=self.getname("ChainedContextual" +
self._table +
self.gensym()))
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
if sub.Format == 1:
self._unparse_contextual_chain_format1(sub, b, lookup)
elif sub.Format == 2:
self._unparse_contextual_chain_format2(sub, b, lookup)
elif sub.Format == 3:
self._unparse_contextual_chain_format3(sub, b, lookup)
else:
raise ValueError
return b, []
def unparseAlternateSubstitution(self, lookup):
b = fontFeatures.Routine(
name=self.getname("AlternateSubstitution" + self.gensym())
)
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
for in_glyph, out_glyphs in sub.alternates.items():
b.addRule(
fontFeatures.Substitution(
singleglyph(in_glyph),
[out_glyphs],
address=self.currentLookup,
flags=lookup.LookupFlag,
)
)
return b, []
def unparseMultipleSubstitution(self, lookup):
"""Turn a GPOS2 (multiple substitution) subtable into a fontFeatures Routine."""
b = fontFeatures.Routine(name=self.getname("MultipleSubstitution" +
self.gensym()))
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
for in_glyph, out_glyphs in sub.mapping.items():
b.addRule(
fontFeatures.Substitution(
singleglyph(in_glyph),
[glyph(x) for x in out_glyphs],
address=self.currentLookup,
flags=lookup.LookupFlag,
))
return b, []
def action(cls, parser, ligatures):
ligatures = sorted(ligatures.resolve(parser.fontfeatures, parser.font),
key=lambda a: len(a))
rv = []
glyphnames = "|".join(sorted(parser.font.keys(), key=lambda a: len(a)))
for l in ligatures:
for liglen in range(5, 0, -1):
ligre = "^" + ("(" + glyphnames +
")_") * liglen + "(" + glyphnames + ")$"
m = re.match(ligre, l)
if m:
rv.append(
fontFeatures.Substitution([[c] for c in m.groups()],
replacement=[[l]]))
break
return [fontFeatures.Routine(rules=rv)]
def unparsePairPositioning(self, lookup):
b = fontFeatures.Routine(name=self.getname("PairPositioning" +
self.gensym()))
self._fix_flags(b, lookup)
for subtable in lookup.SubTable:
if subtable.Format == 1:
for g, pair in zip(subtable.Coverage.glyphs, subtable.PairSet):
for vr in pair.PairValueRecord:
spos = fontFeatures.Positioning(
[[g], [vr.SecondGlyph]],
[
self.makeValueRecord(vr.Value1,
subtable.ValueFormat1),
self.makeValueRecord(vr.Value2,
subtable.ValueFormat2),
],
address=self.currentLookup,
flags=lookup.LookupFlag,
)
b.addRule(spos)
else:
class1 = self._invertClassDef(subtable.ClassDef1.classDefs,
self.font)
class2 = self._invertClassDef(subtable.ClassDef2.classDefs,
self.font)
for ix1, c1 in enumerate(subtable.Class1Record):
if ix1 not in class1:
continue # XXX
for ix2, c2 in enumerate(c1.Class2Record):
if ix2 not in class2:
continue # XXX
vr1 = self.makeValueRecord(c2.Value1,
subtable.ValueFormat1)
vr2 = self.makeValueRecord(c2.Value2,
subtable.ValueFormat2)
if not vr1 and not vr2:
continue
firstClass = list(
set(class1[ix1]) & set(subtable.Coverage.glyphs))
spos = fontFeatures.Positioning(
[firstClass, class2[ix2]],
[vr1, vr2],
address=self.currentLookup,
flags=lookup.LookupFlag,
)
b.addRule(spos)
return b, []
def unparseLookups(self):
if not self.table.LookupList:
return
# Create a dummy list first, to allow resolving chained lookups
for _ in self.table.LookupList.Lookup:
r = fontFeatures.Routine()
self.lookups.append(r)
self.fontFeatures.routines.append(r)
for lookupIdx, lookup in enumerate(self.table.LookupList.Lookup):
routine, deps = self.unparseLookup(lookup, lookupIdx)
debug = self.getDebugInfo(self._table, lookupIdx)
if debug:
routine.address = (self._table, lookupIdx, *debug)
if debug[1]:
routine.name = debug[1]
self.copyRoutineToRoutine(routine, self.lookups[lookupIdx])
def action(self, parser, filename):
rules = {}
reachable = set([])
basedir = os.path.dirname(parser.current_file)
trypath = os.path.join(basedir, filename)
if not os.path.exists(trypath):
trypath = filename
if not os.path.exists(trypath):
raise ValueError("Couldn't find connections file %s" % trypath)
with open(trypath) as csvfile:
reader = csv.DictReader(csvfile)
for line in reader:
left_glyph = line["Left Glyph"]
remainder = list(line.items())[1:]
for (g, v) in remainder:
old = g + "1"
if v == "1" or v == 1 or not v:
continue
replacement = g + str(v)
if not old in rules:
rules[old] = {}
if not replacement in rules[old]:
rules[old][replacement] = []
rules[old][replacement].append(left_glyph)
r = fontFeatures.Routine(name="connections", flags=0x8)
for oldglyph in rules:
for replacement in rules[oldglyph]:
context = rules[oldglyph][replacement]
reachable |= set(context)
reachable |= set([oldglyph, replacement])
r.addRule(
fontFeatures.Substitution(
[[oldglyph]],
[[replacement]],
postcontext=[context],
reverse=True,
))
parser.fontfeatures.namedClasses["reachable_glyphs"] = tuple(
sorted(reachable))
return [r]
def unparseLigatureSubstitution(self, lookup):
"""Turn a GPOS4 (ligature substitution) subtable into a fontFeatures Routine."""
b = fontFeatures.Routine(name=self.getname("LigatureSubstitution" +
self.gensym()))
self._fix_flags(b, lookup)
for sub in lookup.SubTable:
for first, ligatures in sub.ligatures.items():
for lig in ligatures:
substarray = [glyph(first)]
for x in lig.Component:
substarray.append(glyph(x))
b.addRule(
fontFeatures.Substitution(
substarray,
singleglyph(lig.LigGlyph),
address=self.currentLookup,
flags=lookup.LookupFlag,
))
return b, []
def action(self, args):
parser = self.parser
bases = args[0].resolve(parser.fontfeatures, parser.font)
medialra = args[1].resolve(parser.fontfeatures, parser.font)
if len(args) == 3:
otherras = args[2].resolve(parser.fontfeatures, parser.font)
overshoot = 0
else:
overshoot = args[2]
otherras = args[3].resolve(parser.fontfeatures, parser.font)
# Chuck the original ra in the basket
if overshoot is None:
overshoot = 0
ras = set(otherras + medialra)
# Organise ras into overhang widths
ras2bases = {}
rasAndOverhangs = [(m, -parser.font[m].rightMargin + overshoot)
for m in ras]
rasAndOverhangs = list(reversed(sorted(rasAndOverhangs)))
for b in bases:
w = parser.font[b].width - ((parser.font[b].rightMargin or 0) +
(parser.font[b].leftMargin or 0))
bestRa = None
for ra, overhang in rasAndOverhangs:
if overhang <= w:
bestRa = ra
break
if not bestRa:
continue
if bestRa not in ras2bases:
ras2bases[bestRa] = []
ras2bases[bestRa].append(b)
rv = []
for bestRa, basesForThisRa in ras2bases.items():
rv.append(
fontFeatures.Substitution([medialra],
postcontext=[basesForThisRa],
replacement=[[bestRa]]))
return [fontFeatures.Routine(rules=rv)]
def action(self, parser):
glyphs = FontProxy(parser.font).glyphs
rules = []
for g in glyphs:
m = re.match(self.ligature, g)
if not m:
continue
first, second, position = m[1], m[2], m[3]
if position == "u":
first = first + "i1"
second = second + "f1"
rules.append(
fontFeatures.Substitution([[first], [second]], [[g]]))
if position == "f":
first = first + "m1"
second = second + "f1"
rules.append(
fontFeatures.Substitution([[first], [second]], [[g]]))
return [fontFeatures.Routine(name="Ligatures", rules=rules, flags=0x8)]