43 lines
1.5 KiB
Python
43 lines
1.5 KiB
Python
from .values import ImmutableDict, dict_kvs, Embedded, Record
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def merge_embedded_id(a, b):
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return a if a is b else None
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def merge(v0, *vs, merge_embedded=None):
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v = v0
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for vN in vs:
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v = merge2(v, vN, merge_embedded=merge_embedded)
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return v
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def _die():
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raise ValueError('Cannot merge items')
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def merge_seq(aa, bb, merge_embedded=None):
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if len(aa) != len(bb): _die()
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return [merge2(a, b, merge_embedded=merge_embedded) for (a, b) in zip(aa, bb)]
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def merge2(a, b, merge_embedded=None):
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if a == b:
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return a
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if isinstance(a, (list, tuple)) and isinstance(b, (list, tuple)):
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return merge_seq(a, b)
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if isinstance(a, (set, frozenset)) and isinstance(b, (set, frozenset)):
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_die()
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if isinstance(a, dict) and isinstance(b, dict):
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r = {}
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for (ak, av) in a.items():
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bv = b.get(ak, None)
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r[ak] = av if bv is None else merge2(av, bv, merge_embedded=merge_embedded)
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for (bk, bv) in b.items():
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if bk not in r:
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r[bk] = bv
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return r
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if isinstance(a, Record) and isinstance(b, Record):
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return Record(merge2(a.key, b.key, merge_embedded=merge_embedded),
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merge_seq(a.fields, b.fields, merge_embedded=merge_embedded))
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if isinstance(a, Embedded) and isinstance(b, Embedded):
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m = (merge_embedded or merge_embedded_id)(a.embeddedValue, b.embeddedValue)
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if m is None: _die()
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return Embedded(m)
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_die()
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