def _Slice(key):
"""Helper to add one flattened slice tap."""
tap = display_taps.Flattener(key)
# Apply the flatteners from left to right so the innermost flattener
# flattens the leftmost slice. The outer flatteners can then access
# the flattened keys to the left.
self._resources = peek_iterable.Tapper(self._resources, tap)
def _AddFlattenTap(self):
"""Taps one or more resource flatteners into self.resources if needed."""
keys = self._GetFlag('flatten')
if not keys:
return
for key in keys:
flattened_key = []
for k in resource_lex.Lexer(key).Key():
if k is None:
# None represents a [] slice in resource keys.
tap = display_taps.Flattener(flattened_key)
# Apply the flatteners from left to right so the innermost flattener
# flattens the leftmost slice. The outer flatteners can then access
# the flattened keys to the left.
self._resources = peek_iterable.Tapper(self._resources, tap)
else:
flattened_key.append(k)
