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Loosen search iterator #221

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Loosen search iterator #221

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18 changes: 13 additions & 5 deletions src/BioSequences.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -229,26 +229,34 @@ include("search/pwm.jl")



struct Search{Q,I}
struct Search{F,Q,I}
findfunc::F
query::Q
itr::I
overlap::Bool
end

const DEFAULT_OVERLAP = true

search(query, itr; overlap = DEFAULT_OVERLAP) = Search(query, itr, overlap)
search(query, itr; overlap = DEFAULT_OVERLAP, rev=false) = Search(rev ? findprev : findnext, query, itr, overlap)

function Base.iterate(itr::Search, state=firstindex(itr.itr))
val = findnext(itr.query, itr.itr, state)
function Base.iterate(itr::Search{typeof(findnext)}, state=firstindex(itr.itr))
val = itr.findfunc(itr.query, itr.itr, state)
val === nothing && return nothing
state = itr.overlap ? first(val) + 1 : last(val) + 1
return val, state
end

function Base.iterate(itr::Search{typeof(findprev)}, state=firstindex(itr.itr))
val = itr.findfunc(itr.query, itr.itr, state)
val === nothing && return nothing
state = itr.overlap ? last(val) - 1 : first(val) - 1
return val, state
end

const HasRangeEltype = Union{<:ExactSearchQuery, <:ApproximateSearchQuery, <:Regex}

Base.eltype(::Type{<:Search{Q}}) where {Q<:HasRangeEltype} = UnitRange{Int}
Base.eltype(::Type{<:Search{F,Q}}) where {F,Q<:HasRangeEltype} = UnitRange{Int}
Base.eltype(::Type{<:Search}) = Int
Base.IteratorSize(::Type{<:Search}) = Base.SizeUnknown()

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