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"""Routines for converting FontFeatures objects to and from XML."""
from lxml import etree
def toXML(self):
"""Serializes a FontFeatures object to a lxml Element object."""
root = etree.Element("fontfeatures")
root.append(xml_glyph_classes(self))
routines = etree.Element("routines")
for r in self.routines:
routines.append(r.toXML())
root.append(routines)
features = etree.Element("features")
for f, routines in self.features.items():
f_el = etree.Element("feature")
f_el.set("name", f)
for r in routines:
f_el.append(r.toXML())
features.append(f_el)
root.append(features)
anchor_el = etree.Element("anchors")
for glyph, anchors in self.anchors.items():
glyph_el = etree.Element("glyph")
glyph_el.set("name", glyph)
for name, pos in anchors.items():
a_el = etree.Element("anchor")
a_el.set("name", name)
a_el.set("x", str(pos[0]))
a_el.set("y", str(pos[1]))
glyph_el.append(a_el)
anchor_el.append(glyph_el)
root.append(anchor_el)
glyphclasses = etree.Element("glyphclasses")
for glyph, classname in self.glyphclasses.items():
glyph_el = etree.Element("glyph")
glyph_el.set("name", glyph)
glyph_el.set("class", classname)
glyphclasses.append(glyph_el)
root.append(glyphclasses)
return root
def xml_glyph_classes(self):
root = etree.Element("namedclasses")
for name, values in self.namedClasses.items():
gc = etree.Element("class")
gc.set("name", name)
for g in values:
glyph_el = etree.Element("glyph")
glyph_el.text = g
gc.append(glyph_el)
root.append(gc)
return root
@classmethod
def fromXML(klass, el):
"""Creates a FontFeatures object from a lxml Element object."""
f = klass()
from fontFeatures import RoutineReference, Routine
for part in el:
if part.tag == "namedclasses":
for cl_el in part:
f.namedClasses[cl_el.get("name")] = [g.text for g in cl_el]
elif part.tag == "routines":
f.routines = [Routine.fromXML(r) for r in part]
elif part.tag == "features":
for feat in part:
f.features[feat.get("name")] = [
RoutineReference.fromXML(x) for x in feat
]
elif part.tag == "anchors":
for glyph in part:
f.anchors[glyph.get("name")] = {
el.get("name"): (int(el.get("x")), int(el.get("y"))) for el in glyph
}
elif part.tag == "glyphclasses":
for cl_el in part:
f.glyphclasses[cl_el.get("name")] = cl_el.get("class")
for refs in f.features.values():
for ref in refs:
ref.resolve(f)
return f
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