102c0e0e56
Currently, the compiler uses them to figure out which set of languagesystems would apply for the current scope. However, this information is not yet used for anything.
77 lines
2.9 KiB
Python
77 lines
2.9 KiB
Python
from __future__ import print_function, division, absolute_import
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from __future__ import unicode_literals
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from fontTools.feaLib.error import FeatureLibError
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from fontTools.feaLib.parser import Parser
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from fontTools.ttLib.tables import otTables
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def addOpenTypeFeatures(featurefile_path, font):
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builder = Builder(featurefile_path, font)
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builder.build()
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class Builder(object):
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def __init__(self, featurefile_path, font):
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self.featurefile_path = featurefile_path
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self.font = font
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self.default_language_systems_ = set()
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self.script_ = None
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self.lookupflag_ = 0
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self.language_systems = set()
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def build(self):
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self.gpos = self.font['GPOS'] = self.makeTable('GPOS')
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self.gsub = self.font['GSUB'] = self.makeTable('GSUB')
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parsetree = Parser(self.featurefile_path).parse()
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parsetree.build(self)
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def makeTable(self, tag):
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table = getattr(otTables, tag, None)()
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table.Version = 1.0
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table.ScriptList = otTables.ScriptList()
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table.ScriptList.ScriptCount = 0
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table.ScriptList.ScriptRecord = []
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table.FeatureList = otTables.FeatureList()
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table.FeatureList.FeatureCount = 0
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table.FeatureList.FeatureRecord = []
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table.LookupList = otTables.LookupList()
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table.LookupList.LookupCount = 0
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table.LookupList.Lookup = []
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return table
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def add_language_system(self, location, script, language):
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# OpenType Feature File Specification, section 4.b.i
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if (script == "DFLT" and language == "dflt" and
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self.default_language_systems_):
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raise FeatureLibError(
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'If "languagesystem DFLT dflt" is present, it must be '
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'the first of the languagesystem statements', location)
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self.default_language_systems_.add((script, language))
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def get_default_language_systems_(self):
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# OpenType Feature File specification, 4.b.i. languagesystem:
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# If no "languagesystem" statement is present, then the
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# implementation must behave exactly as though the following
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# statement were present at the beginning of the feature file:
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# languagesystem DFLT dflt;
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if self.default_language_systems_:
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return frozenset(self.default_language_systems_)
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else:
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return frozenset({('DFLT', 'dflt')})
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def start_feature(self, location, name):
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self.language_systems = self.get_default_language_systems_()
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def set_language(self, location, language, include_default):
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if include_default:
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langsys = set(self.get_default_language_systems_())
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else:
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langsys = set()
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langsys.add((self.script_, language))
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self.language_systems = frozenset(langsys)
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def set_script(self, location, script):
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self.script_ = script
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self.lookupflag_ = 0
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self.set_language(location, 'dflt', include_default=True)
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