24 lines
742 B
Text
24 lines
742 B
Text
procedure deepcopy(A, cache) #: return a deepcopy of A
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local k
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/cache := table() # used to handle multireferenced objects
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if \cache[A] then return cache[A]
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case type(A) of {
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"table"|"list": {
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cache[A] := copy(A)
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every cache[A][k := key(A)] := deepcopy(A[k], cache)
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}
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"set": {
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cache[A] := set()
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every insert(cache[A], deepcopy(!A, cache))
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}
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default: { # records and objects (encoded as records)
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cache[A] := copy(A)
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if match("record ",image(A)) then {
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every cache[A][k := key(A)] := deepcopy(A[k], cache)
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}
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}
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}
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return .cache[A]
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end
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