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"""Routines for converting Positioning rules to and from XML."""
from lxml import etree
from fontFeatures import ValueRecord, Routine
# We can't monkeypatch this, because it's not our class.
def _valuerecord_fromXML(el):
v = ValueRecord()
for part in ["xPlacement", "yPlacement", "xAdvance", "yAdvance"]:
if el.get(part):
setattr(v, part, int(el.get(part)))
return v
def _valuerecord_toXML(v):
el = etree.Element("valuerecord")
for part in ["xPlacement", "yPlacement", "xAdvance", "yAdvance"]:
if getattr(v, part):
el.set(part, str(getattr(v, part)))
return el
def _toXML(self, root):
self._makeglyphslots(root, "glyphs", self.glyphs)
wrapper = etree.SubElement(root, "positions")
for p in self.valuerecords:
wrapper.append(_valuerecord_toXML(p))
return root
@classmethod
def fromXML(klass, el):
"""Creates a rule from a lxml Element object."""
position = el.find("positions")
positions = [_valuerecord_fromXML(x) for x in position.findall("valuerecord")]
rule = klass(
klass._slotArray(klass, el.find("glyphs")),
positions,
precontext=klass._slotArray(klass, el.find("precontext")),
postcontext=klass._slotArray(klass, el.find("postcontext")),
address=el.get("address"),
languages=el.get("languages"),
flags=el.get("flags"),
)
if el.find("lookups"):
rule.lookups = []
for slot in list(el):
routines = [Routine.fromXML(x) for x in slot.findall("routine")]
rule.lookups.append(routines)
return rule
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