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Fix annotated join with non-concrete eltype iters #54919

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Jul 24, 2024
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Fix annotated join with non-concrete eltype iters #54919

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16 changes: 12 additions & 4 deletions base/strings/io.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -354,12 +354,20 @@ function join(io::IO, iterator, delim="")
end

function _join_preserve_annotations(iterator, args...)
if _isannotated(eltype(iterator)) || any(_isannotated, args)
if isconcretetype(eltype(iterator)) && !_isannotated(eltype(iterator)) && !any(_isannotated, args)
sprint(join, iterator, args...)
else
io = AnnotatedIOBuffer()
join(io, iterator, args...)
read(seekstart(io), AnnotatedString{String})
else
sprint(join, iterator, args...)
# If we know (from compile time information, or dynamically in the case
# of iterators with a non-concrete eltype), that the result is annotated
# in nature, we extract an `AnnotatedString`, otherwise we just extract
# a plain `String` from `io`.
if isconcretetype(eltype(iterator)) || !isempty(io.annotations)
read(seekstart(io), AnnotatedString{String})
else
String(take!(io.io))
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end
end
end

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2 changes: 2 additions & 0 deletions test/strings/annotated.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,8 @@ end
[(1:4, :label => 5),
(5:5, :label => 2),
(6:9, :label => 5)])
@test join((String(str1), str1), ' ') ==
Base.AnnotatedString("test test", [(6:9, :label => 5)])
@test repeat(str1, 2) == Base.AnnotatedString("testtest", [(1:8, :label => 5)])
@test repeat(str2, 2) == Base.AnnotatedString("casecase", [(2:3, :label => "oomph"),
(6:7, :label => "oomph")])
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