def _add_rule(self, rule):
key = None
for pv in enumerate(rule):
if pv[1] is not None:
key = pv
if key is not None:
ind = self._index.setdefault(key, {})
ind[rule] = 1
trellis.on_undo(ind.pop, rule, 1)
def _watching(self):
cells = self._watching or {}
for k in self.keys.removed:
if k in cells:
trellis.on_undo(cells.__setitem__, k, cells[k])
del cells[k]
trellis.mark_dirty()
lookup = self.lookup_func
for k in self.keys.added:
trellis.on_undo(cells.pop, k, None)
cells[k] = trellis.Cell(instancemethod(lookup, k, type(k)))
trellis.mark_dirty()
return cells
def _del_rule(self, rule):
index = self._index
for pv in enumerate(rule):
if pv in index:
index[pv].pop(rule, 1)
trellis.on_undo(index[pv].__setitem__, rule, 1)
