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1
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struct EnumerableMapMany{T,SO,CS<:Function,RS<:Function} <: Enumerable
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2
|
47
|
source::SO
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3
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|
collectionSelector::CS
|
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4
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|
resultSelector::RS
|
|
5
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|
end
|
|
6
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|
|
|
7
|
0
|
Base.eltype(::Type{EnumerableMapMany{T,SO,CS,RS}}) where {T,SO,CS,RS} = T
|
|
8
|
|
|
|
9
|
|
# TODO Make sure this is actually correct. We might have to be more selective,
|
|
10
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|
# i.e. only scan arguments for certain types of expression etc.
|
|
11
|
|
function expr_contains_ref_to(expr::Expr, var_name::Symbol)
|
|
12
|
47
|
for sub_expr in expr.args
|
|
13
|
47
|
if isa(sub_expr, Symbol)
|
|
14
|
47
|
if sub_expr==var_name
|
|
15
|
47
|
return true
|
|
16
|
|
end
|
|
17
|
|
else
|
|
18
|
47
|
test_sub = expr_contains_ref_to(sub_expr, var_name)
|
|
19
|
47
|
if test_sub
|
|
20
|
47
|
return true
|
|
21
|
|
end
|
|
22
|
|
end
|
|
23
|
|
end
|
|
24
|
0
|
return false
|
|
25
|
|
end
|
|
26
|
|
|
|
27
|
|
function expr_contains_ref_to(expr::Symbol, var_name::Symbol)
|
|
28
|
47
|
return expr==var_name
|
|
29
|
|
end
|
|
30
|
|
|
|
31
|
|
function expr_contains_ref_to(expr::QuoteNode, var_name::Symbol)
|
|
32
|
0
|
return expr==var_name
|
|
33
|
|
end
|
|
34
|
|
|
|
35
|
|
function expr_contains_ref_to(expr::Function, var_name::Symbol)
|
|
36
|
0
|
return false
|
|
37
|
|
end
|
|
38
|
|
|
|
39
|
0
|
expr_contains_ref_to(::Number, ::Symbol) = false
|
|
40
|
|
|
|
41
|
|
function mapmany(source::Enumerable, f_collectionSelector::Function, collectionSelector::Expr, f_resultSelector::Function, resultSelector::Expr)
|
|
42
|
47
|
TS = eltype(source)
|
|
43
|
|
# First detect whether the collectionSelector return value depends at all
|
|
44
|
|
# on the value of the anonymous function argument
|
|
45
|
47
|
anon_var = collectionSelector.head==:escape ? collectionSelector.args[1].args[1] : collectionSelector.args[1]
|
|
46
|
47
|
body = collectionSelector.head==:escape ? collectionSelector.args[1].args[2].args[2] : collectionSelector.args[2].args[2]
|
|
47
|
47
|
crossJoin = !expr_contains_ref_to(body, anon_var)
|
|
48
|
|
|
|
49
|
47
|
if crossJoin
|
|
50
|
0
|
inner_collection = f_collectionSelector(nothing)
|
|
51
|
|
input_type_collection_selector = typeof(inner_collection)
|
|
52
|
47
|
TCE = input_type_collection_selector.parameters[1]
|
|
53
|
|
else
|
|
54
|
|
input_type_collection_selector = Base._return_type(f_collectionSelector, Tuple{TS,})
|
|
55
|
|
TCE = typeof(input_type_collection_selector)==Union || input_type_collection_selector==Any ? Any : eltype(input_type_collection_selector)
|
|
56
|
|
end
|
|
57
|
|
|
|
58
|
47
|
T = Base._return_type(f_resultSelector, Tuple{TS,TCE})
|
|
59
|
|
SO = typeof(source)
|
|
60
|
|
|
|
61
|
|
CS = typeof(f_collectionSelector)
|
|
62
|
47
|
RS = typeof(f_resultSelector)
|
|
63
|
|
|
|
64
|
47
|
return EnumerableMapMany{T,SO,CS,RS}(source,f_collectionSelector,f_resultSelector)
|
|
65
|
|
end
|
|
66
|
|
|
|
67
|
|
# TODO This should be changed to a lazy implementation
|
|
68
|
|
function Base.iterate(iter::EnumerableMapMany{T,SO,CS,RS}) where {T,SO,CS,RS}
|
|
69
|
47
|
results = Array{T}(undef, 0)
|
|
70
|
47
|
for i in iter.source
|
|
71
|
47
|
for j in iter.collectionSelector(i)
|
|
72
|
47
|
push!(results,iter.resultSelector(i,j))
|
|
73
|
|
end
|
|
74
|
|
end
|
|
75
|
|
|
|
76
|
47
|
if length(results)==0
|
|
77
|
0
|
return nothing
|
|
78
|
|
end
|
|
79
|
|
|
|
80
|
47
|
return results[1], (results,2)
|
|
81
|
|
end
|
|
82
|
|
|
|
83
|
|
function Base.iterate(iter::EnumerableMapMany{T,SO,CS,RS}, state) where {T,SO,CS,RS}
|
|
84
|
17
|
if state[2]>length(state[1])
|
|
85
|
17
|
return nothing
|
|
86
|
|
else
|
|
87
|
17
|
return state[1][state[2]], (state[1], state[2]+1)
|
|
88
|
|
end
|
|
89
|
|
end
|
davidanthoff