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from .merger import Merger
from .strategy.core import STRATEGY_END
# some standard mergers available
# this merge will never raise an exception.
# in the case of type mismatches,
# the value from the second object
# will override the previous one.
always_merger = Merger(
[
(list, "append"),
(dict, "merge")
],
["override"],
["override"]
)
# this merge strategies attempts
# to merge (append for list, unify for dicts)
# if possible, but raises an exception
# in the case of type conflicts.
merge_or_raise = Merger(
[
(list, "append"),
(dict, "merge")
],
[], []
)
# a conservative merge tactic:
# for data structures with a specific
# strategy, keep the existing value.
# similar to always_merger but instead
# keeps existing values when faced
# with a type conflict.
conservative_merger = Merger(
[
(list, "append"),
(dict, "merge")
],
["use_existing"],
["use_existing"]
)
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