enumerable_drop.jl at 479b55e ⋅ queryverse/QueryOperators.jl

struct EnumerableDrop{T,S} <: Enumerable
    source::S
    n::Int
end

function drop(source::Enumerable, n::Integer)
    T = eltype(source)
    S = typeof(source)
    return EnumerableDrop{T,S}(source, Int(n))
end

Base.IteratorSize(::Type{EnumerableDrop{T,S}}) where {T,S} = (Base.IteratorSize(S) isa Base.HasLength || Base.IteratorSize(S) isa Base.HasShape) ? Base.HasLength() : Base.SizeUnknown()

Base.eltype(::Type{EnumerableDrop{T,S}}) where {T,S} = T

Base.length(iter::EnumerableDrop{T,S}) where {T,S} = max(length(iter.source)-iter.n,0)

function Base.iterate(iter::EnumerableDrop{T,S}) where {T,S}
    ret = iterate(iter.source)
    for i in 1:iter.n
        if ret===nothing
            return nothing
        else
            ret = iterate(iter.source, ret[2])
        end
    end
    return ret
end

function Base.iterate(iter::EnumerableDrop{T,S}, state) where {T,S}
    return iterate(iter.source, state)
end

1		struct EnumerableDrop{T,S} <: Enumerable
2	23	source::S
3		n::Int
4		end
5
6		function drop(source::Enumerable, n::Integer)
7	23	T = eltype(source)
8		S = typeof(source)
9	23	return EnumerableDrop{T,S}(source, Int(n))
10		end
11
12	0	Base.IteratorSize(::Type{EnumerableDrop{T,S}}) where {T,S} = (Base.IteratorSize(S) isa Base.HasLength \|\| Base.IteratorSize(S) isa Base.HasShape) ? Base.HasLength() : Base.SizeUnknown()
13
14	0	Base.eltype(::Type{EnumerableDrop{T,S}}) where {T,S} = T
15
16	5	Base.length(iter::EnumerableDrop{T,S}) where {T,S} = max(length(iter.source)-iter.n,0)
17
18		function Base.iterate(iter::EnumerableDrop{T,S}) where {T,S}
19	23	ret = iterate(iter.source)
20	23	for i in 1:iter.n
21	23	if ret===nothing
22	23	return nothing
23		else
24	23	ret = iterate(iter.source, ret[2])
25		end
26		end
27	23	return ret
28		end
29
30		function Base.iterate(iter::EnumerableDrop{T,S}, state) where {T,S}
31	23	return iterate(iter.source, state)
32		end

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