enumerable_map.jl at 192a00e ⋅ queryverse/QueryOperators.jl

struct EnumerableMap{T, S, Q<:Function} <: Enumerable
    source::S
    f::Q
end

Base.IteratorSize(::Type{EnumerableMap{T,S,Q}}) where {T,S,Q} = haslength(S)

Base.eltype(iter::Type{EnumerableMap{T,S,Q}}) where {T,S,Q} = T

Base.length(iter::EnumerableMap{T,S,Q}) where {T,S,Q} = length(iter.source)

function map(source::Enumerable, f::Function, f_expr::Expr)
    TS = eltype(source)
    T = Base._return_type(f, Tuple{TS,})
    S = typeof(source)
    Q = typeof(f)
    return EnumerableMap{T,S,Q}(source, f)
end

function Base.iterate(iter::EnumerableMap{T,S,Q}, state...) where {T,S,Q}
    ret = iterate(iter.source, state...)
    if ret===nothing
        return nothing
    else
        return iter.f(ret[1]), ret[2]
    end
end

1		struct EnumerableMap{T, S, Q<:Function} <: Enumerable
2	23	source::S
3		f::Q
4		end
5
6	0	Base.IteratorSize(::Type{EnumerableMap{T,S,Q}}) where {T,S,Q} = haslength(S)
7
8	0	Base.eltype(iter::Type{EnumerableMap{T,S,Q}}) where {T,S,Q} = T
9
10	5	Base.length(iter::EnumerableMap{T,S,Q}) where {T,S,Q} = length(iter.source)
11
12		function map(source::Enumerable, f::Function, f_expr::Expr)
13	23	TS = eltype(source)
14	23	T = Base._return_type(f, Tuple{TS,})
15		S = typeof(source)
16	23	Q = typeof(f)
17	23	return EnumerableMap{T,S,Q}(source, f)
18		end
19
20		function Base.iterate(iter::EnumerableMap{T,S,Q}, state...) where {T,S,Q}
21	5	ret = iterate(iter.source, state...)
22	10	if ret===nothing
23	10	return nothing
24		else
25	10	return iter.f(ret[1]), ret[2]
26		end
27		end

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