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"""ttLib.ValueRecord: Converting ValueRecord rules to TrueType."""
from fontTools.ttLib.tables.otBase import ValueRecord as OTLValueRecord
from fontTools.feaLib.variableScalar import VariableScalar
from fontTools.varLib.builder import buildVarDevTable
def toOTValueRecord(self, ff, pairPosContext=False):
"""Converts the ValueRecord to an ``OTLValueRecord`` object. If the
value record contains any variable scalars, they are saved to the
GDEF variation store."""
otl_value = OTLValueRecord()
if pairPosContext and not self:
self.XAdvance = 0
for item in ["xPlacement", "yPlacement", "xAdvance", "yAdvance"]:
itemvalue = getattr(self, item)
if not itemvalue:
continue
item = item[0].upper() + item[1:]
if isinstance(itemvalue, VariableScalar):
itemvalue, index = itemvalue.add_to_variation_store(ff.varstorebuilder)
if index != 0xFFFF:
setattr(otl_value, item[0:4] + "Device", buildVarDevTable(index))
setattr(otl_value, item, itemvalue)
return otl_value
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