def buildGSUB():
"""Build a GSUB table from scratch."""
fontTable = newTable("GSUB")
gsub = fontTable.table = ot.GSUB()
gsub.Version = 0x00010001 # allow gsub.FeatureVariations
gsub.ScriptList = ot.ScriptList()
gsub.ScriptList.ScriptRecord = []
gsub.FeatureList = ot.FeatureList()
gsub.FeatureList.FeatureRecord = []
gsub.LookupList = ot.LookupList()
gsub.LookupList.Lookup = []
srec = ot.ScriptRecord()
srec.ScriptTag = 'DFLT'
srec.Script = ot.Script()
srec.Script.DefaultLangSys = None
srec.Script.LangSysRecord = []
langrec = ot.LangSysRecord()
langrec.LangSys = ot.LangSys()
langrec.LangSys.ReqFeatureIndex = 0xFFFF
langrec.LangSys.FeatureIndex = [0]
srec.Script.DefaultLangSys = langrec.LangSys
gsub.ScriptList.ScriptRecord.append(srec)
gsub.FeatureVariations = None
return fontTable
def create_script_record(self):
lang_sys = otTables.LangSys()
lang_sys.ReqFeatureIndex = 0xFFFF # No required features
lang_sys.FeatureIndex = []
script = otTables.Script()
script.DefaultLangSys = lang_sys
script.LangSysRecord = []
script_record = otTables.ScriptRecord()
script_record.ScriptTag = "DFLT"
script_record.Script = script
return script_record
def mergeLangSyses(lst): assert lst # TODO Support merging ReqFeatureIndex assert all(l.ReqFeatureIndex == 0xFFFF for l in lst) self = otTables.LangSys() self.LookupOrder = None self.ReqFeatureIndex = 0xFFFF self.FeatureIndex = mergeFeatureLists([l.FeatureIndex for l in lst if l.FeatureIndex]) self.FeatureCount = len(self.FeatureIndex) return self
def parseScriptList(lines, featureMap=None):
self = ot.ScriptList()
records = []
with lines.between('script table'):
for line in lines:
while len(line) < 4:
line.append('')
scriptTag, langSysTag, defaultFeature, features = line
log.debug("Adding script %s language-system %s", scriptTag,
langSysTag)
langSys = ot.LangSys()
langSys.LookupOrder = None
if defaultFeature:
setReference(mapFeature, featureMap, defaultFeature, setattr,
langSys, 'ReqFeatureIndex')
else:
langSys.ReqFeatureIndex = 0xFFFF
syms = stripSplitComma(features)
langSys.FeatureIndex = theList = [3] * len(syms)
for i, sym in enumerate(syms):
setReference(mapFeature, featureMap, sym, setitem, theList, i)
langSys.FeatureCount = len(langSys.FeatureIndex)
script = [s for s in records if s.ScriptTag == scriptTag]
if script:
script = script[0].Script
else:
scriptRec = ot.ScriptRecord()
scriptRec.ScriptTag = scriptTag
scriptRec.Script = ot.Script()
records.append(scriptRec)
script = scriptRec.Script
script.DefaultLangSys = None
script.LangSysRecord = []
script.LangSysCount = 0
if langSysTag == 'default':
script.DefaultLangSys = langSys
else:
langSysRec = ot.LangSysRecord()
langSysRec.LangSysTag = langSysTag + ' ' * (4 -
len(langSysTag))
langSysRec.LangSys = langSys
script.LangSysRecord.append(langSysRec)
script.LangSysCount = len(script.LangSysRecord)
for script in records:
script.Script.LangSysRecord = sorted(script.Script.LangSysRecord,
key=lambda rec: rec.LangSysTag)
self.ScriptRecord = sorted(records, key=lambda rec: rec.ScriptTag)
self.ScriptCount = len(self.ScriptRecord)
return self
def parseScriptList(lines, featureMap=None):
self = ot.ScriptList()
records = []
with lines.between('script table'):
for line in lines:
scriptTag, langSysTag, defaultFeature, features = line
debug("Adding script", scriptTag, "language-system", langSysTag)
langSys = ot.LangSys()
langSys.LookupOrder = None
langSys.ReqFeatureIndex = mapFeature(defaultFeature, featureMap) if defaultFeature else 0xFFFF
langSys.FeatureIndex = [mapFeature(sym, featureMap) for sym in stripSplitComma(features)]
langSys.FeatureCount = len(langSys.FeatureIndex)
script = [s for s in records if s.ScriptTag == scriptTag]
if script:
script = script[0].Script
else:
scriptRec = ot.ScriptRecord()
scriptRec.ScriptTag = scriptTag
scriptRec.Script = ot.Script()
records.append(scriptRec)
script = scriptRec.Script
script.DefaultLangSys = None
script.LangSysRecord = []
script.LangSysCount = 0
if langSysTag == 'default':
script.DefaultLangSys = langSys
else:
langSysRec = ot.LangSysRecord()
langSysRec.LangSysTag = langSysTag + ' '*(4 - len(langSysTag))
langSysRec.LangSys = langSys
script.LangSysRecord.append(langSysRec)
script.LangSysCount = len(script.LangSysRecord)
for script in records:
script.Script.LangSysRecord = sorted(script.Script.LangSysRecord, key=lambda rec: rec.LangSysTag)
self.ScriptRecord = sorted(records, key=lambda rec: rec.ScriptTag)
self.ScriptCount = len(self.ScriptRecord)
return self
def makeTable(self, tag):
table = getattr(otTables, tag, None)()
table.Version = 1.0
table.ScriptList = otTables.ScriptList()
table.ScriptList.ScriptRecord = []
table.FeatureList = otTables.FeatureList()
table.FeatureList.FeatureRecord = []
table.LookupList = otTables.LookupList()
table.LookupList.Lookup = []
for lookup in self.lookups_:
lookup.lookup_index = None
for i, lookup_builder in enumerate(self.lookups_):
if lookup_builder.table != tag:
continue
# If multiple lookup builders would build equivalent lookups,
# emit them only once. This is quadratic in the number of lookups,
# but the checks are cheap. If performance ever becomes an issue,
# we could hash the lookup content and only compare those with
# the same hash value.
equivalent_builder = None
for other_builder in self.lookups_[:i]:
if lookup_builder.equals(other_builder):
equivalent_builder = other_builder
if equivalent_builder is not None:
lookup_builder.lookup_index = equivalent_builder.lookup_index
continue
lookup_builder.lookup_index = len(table.LookupList.Lookup)
table.LookupList.Lookup.append(lookup_builder.build())
# Build a table for mapping (tag, lookup_indices) to feature_index.
# For example, ('liga', (2,3,7)) --> 23.
feature_indices = {}
required_feature_indices = {} # ('latn', 'DEU') --> 23
scripts = {} # 'latn' --> {'DEU': [23, 24]} for feature #23,24
for key, lookups in sorted(self.features_.items()):
script, lang, feature_tag = key
# l.lookup_index will be None when a lookup is not needed
# for the table under construction. For example, substitution
# rules will have no lookup_index while building GPOS tables.
lookup_indices = tuple([
l.lookup_index for l in lookups if l.lookup_index is not None
])
if len(lookup_indices) == 0:
continue
feature_key = (feature_tag, lookup_indices)
feature_index = feature_indices.get(feature_key)
if feature_index is None:
feature_index = len(table.FeatureList.FeatureRecord)
frec = otTables.FeatureRecord()
frec.FeatureTag = feature_tag
frec.Feature = otTables.Feature()
frec.Feature.FeatureParams = None
frec.Feature.LookupListIndex = lookup_indices
frec.Feature.LookupCount = len(lookup_indices)
table.FeatureList.FeatureRecord.append(frec)
feature_indices[feature_key] = feature_index
scripts.setdefault(script, {}).setdefault(lang,
[]).append(feature_index)
if self.required_features_.get((script, lang)) == feature_tag:
required_feature_indices[(script, lang)] = feature_index
# Build ScriptList.
for script, lang_features in sorted(scripts.items()):
srec = otTables.ScriptRecord()
srec.ScriptTag = script
srec.Script = otTables.Script()
srec.Script.DefaultLangSys = None
srec.Script.LangSysRecord = []
for lang, feature_indices in sorted(lang_features.items()):
langrec = otTables.LangSysRecord()
langrec.LangSys = otTables.LangSys()
langrec.LangSys.LookupOrder = None
req_feature_index = \
required_feature_indices.get((script, lang))
if req_feature_index is None:
langrec.LangSys.ReqFeatureIndex = 0xFFFF
else:
langrec.LangSys.ReqFeatureIndex = req_feature_index
langrec.LangSys.FeatureIndex = [
i for i in feature_indices if i != req_feature_index
]
langrec.LangSys.FeatureCount = \
len(langrec.LangSys.FeatureIndex)
if lang == "dflt":
srec.Script.DefaultLangSys = langrec.LangSys
else:
langrec.LangSysTag = lang
srec.Script.LangSysRecord.append(langrec)
srec.Script.LangSysCount = len(srec.Script.LangSysRecord)
table.ScriptList.ScriptRecord.append(srec)
table.ScriptList.ScriptCount = len(table.ScriptList.ScriptRecord)
table.FeatureList.FeatureCount = len(table.FeatureList.FeatureRecord)
table.LookupList.LookupCount = len(table.LookupList.Lookup)
return table
def makeTable(self, tag):
table = getattr(otTables, tag, None)()
table.Version = 1.0
table.ScriptList = otTables.ScriptList()
table.ScriptList.ScriptRecord = []
table.FeatureList = otTables.FeatureList()
table.FeatureList.FeatureRecord = []
table.LookupList = otTables.LookupList()
table.LookupList.Lookup = self.buildLookups_(tag)
# Build a table for mapping (tag, lookup_indices) to feature_index.
# For example, ('liga', (2,3,7)) --> 23.
feature_indices = {}
required_feature_indices = {} # ('latn', 'DEU') --> 23
scripts = {} # 'latn' --> {'DEU': [23, 24]} for feature #23,24
for key, lookups in sorted(self.features_.items()):
script, lang, feature_tag = key
# l.lookup_index will be None when a lookup is not needed
# for the table under construction. For example, substitution
# rules will have no lookup_index while building GPOS tables.
lookup_indices = tuple([l.lookup_index for l in lookups
if l.lookup_index is not None])
if len(lookup_indices) == 0:
continue
feature_key = (feature_tag, lookup_indices)
feature_index = feature_indices.get(feature_key)
if feature_index is None:
feature_index = len(table.FeatureList.FeatureRecord)
frec = otTables.FeatureRecord()
frec.FeatureTag = feature_tag
frec.Feature = otTables.Feature()
frec.Feature.FeatureParams = None
frec.Feature.LookupListIndex = lookup_indices
frec.Feature.LookupCount = len(lookup_indices)
table.FeatureList.FeatureRecord.append(frec)
feature_indices[feature_key] = feature_index
scripts.setdefault(script, {}).setdefault(lang, []).append(
feature_index)
if self.required_features_.get((script, lang)) == feature_tag:
required_feature_indices[(script, lang)] = feature_index
# Build ScriptList.
for script, lang_features in sorted(scripts.items()):
srec = otTables.ScriptRecord()
srec.ScriptTag = script
srec.Script = otTables.Script()
srec.Script.DefaultLangSys = None
srec.Script.LangSysRecord = []
for lang, feature_indices in sorted(lang_features.items()):
langrec = otTables.LangSysRecord()
langrec.LangSys = otTables.LangSys()
langrec.LangSys.LookupOrder = None
req_feature_index = \
required_feature_indices.get((script, lang))
if req_feature_index is None:
langrec.LangSys.ReqFeatureIndex = 0xFFFF
else:
langrec.LangSys.ReqFeatureIndex = req_feature_index
langrec.LangSys.FeatureIndex = [i for i in feature_indices
if i != req_feature_index]
langrec.LangSys.FeatureCount = \
len(langrec.LangSys.FeatureIndex)
if lang == "dflt":
srec.Script.DefaultLangSys = langrec.LangSys
else:
langrec.LangSysTag = lang
srec.Script.LangSysRecord.append(langrec)
srec.Script.LangSysCount = len(srec.Script.LangSysRecord)
table.ScriptList.ScriptRecord.append(srec)
table.ScriptList.ScriptCount = len(table.ScriptList.ScriptRecord)
table.FeatureList.FeatureCount = len(table.FeatureList.FeatureRecord)
table.LookupList.LookupCount = len(table.LookupList.Lookup)
return table
