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"""Routines for converting Substitution rules to and from XML."""
from fontFeatures import Routine
def _toXML(self, root):
self._makeglyphslots(root, "from", self.input)
self._makeglyphslots(root, "to", self.replacement)
return root
@classmethod
def fromXML(klass, el):
"""Creates a rule from a lxml Element object."""
rule = klass(
klass._slotArray(klass, el.find("from")),
klass._slotArray(klass, el.find("to")),
precontext=klass._slotArray(klass, el.find("precontext")),
postcontext=klass._slotArray(klass, el.find("postcontext")),
address=el.get("address"),
languages=el.get("languages"),
reverse=el.get("reverse"),
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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