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1
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struct EnumerableUnique{T,TKEY,S,Q<:Function} <: Enumerable
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2
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23
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source::S
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3
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f::Q
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4
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end
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5
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|
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|
6
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function unique(source::Enumerable, f::Function, f_expr::Expr)
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7
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23
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T = eltype(source)
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|
8
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S = typeof(source)
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|
9
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23
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TKEY = Base._return_type(f, Tuple{T,})
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|
10
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23
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return EnumerableUnique{T,TKEY,S,typeof(f)}(source, f)
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11
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end
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12
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13
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0
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Base.eltype(::Type{EnumerableUnique{T,TKEY,S,Q}}) where {T,TKEY,S,Q} = T
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14
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|
|
15
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function Base.iterate(iter::EnumerableUnique{T,TKEY,S,Q}) where {T,TKEY,S,Q}
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16
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5
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ret = iterate(iter.source)
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|
17
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|
|
18
|
10
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ret===nothing && return nothing
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|
19
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|
|
20
|
5
|
observed_keys = Set{TKEY}()
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|
21
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|
|
22
|
0
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first_element = ret[1]
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|
23
|
0
|
source_state = ret[2]
|
|
24
|
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|
|
25
|
5
|
key_first_element = iter.f(first_element)
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|
26
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|
|
27
|
5
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push!(observed_keys, key_first_element)
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|
28
|
|
|
|
29
|
10
|
return first_element, (observed_keys=observed_keys, source_state=source_state)
|
|
30
|
|
end
|
|
31
|
|
|
|
32
|
|
function Base.iterate(iter::EnumerableUnique{T,TKEY,S,Q}, state) where {T,TKEY,S,Q}
|
|
33
|
23
|
ret = iterate(iter.source, state.source_state)
|
|
34
|
|
|
|
35
|
23
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ret===nothing && return nothing
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|
36
|
|
|
|
37
|
23
|
while true
|
|
38
|
|
current_element = ret[1]
|
|
39
|
18
|
key_current_element=iter.f(current_element)
|
|
40
|
23
|
if key_current_element in state.observed_keys
|
|
41
|
18
|
ret = iterate(iter.source, ret[2])
|
|
42
|
23
|
ret===nothing && return nothing
|
|
43
|
|
else
|
|
44
|
18
|
push!(state.observed_keys, key_current_element)
|
|
45
|
|
|
|
46
|
23
|
return current_element, (observed_keys=state.observed_keys, source_state=ret[2])
|
|
47
|
|
end
|
|
48
|
|
end
|
|
49
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end
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davidanthoff