Introduce groupmark number-parsing option
#128
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## main #128 +/- ##
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- Coverage 87.67% 86.25% -1.42%
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| @test Parsers.xparse(Float32, "100,000,00099e-2"; groupmark=',').val ≈ 100_000_000.99 | ||
| @test Parsers.xparse(Float32, "1,0,0,0,0,0,0,0,099e-2"; groupmark=',').val ≈ 100_000_000.99 | ||
| @test Parsers.xparse(Float32, "10000000099e-2"; groupmark=',').val ≈ 100_000_000.99 |
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Tests look pretty good. Can we add a few more:
@test_throwswhen decimal and groupmark are the same?- Error/boundary cases; like
Parsers.xparse(Float64, "100,abc"; groupmark=',').val === 100.0, and maybe that we didn't consume past the,as well (add a test fortlenon the parsers result) - Same error/boundary cases for ints
- I think we also need to throw an error if
delimandgroupmarkare the same; like ifdelim=','andgroupmark=',', thena,b,c,100,000is ambiguous (columns of ["a", "b", "c", 100, 0] or ["a", "b", "c", 100_000])
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Great suggestions, thanks!
For now I allow groupmark == delim iff quoted is true (but happy to change if you'd prefer). The reason is that a very common grouping mark is the comma, which is also a very common delimiter... and to disambiguate the two, one should use quoting.
This allows for a wider range of valid CSVs to be parsed, if people don't quote their locale-formatted numbers, this might produce weird results.
We seem to allow the following:
julia> Parsers.xparse(Float64, "42,1"; decimal=',', delim=',')
Parsers.Result{Float64}(33, 4, 42.1)which is also ambiguous and could happen in Czech locale. This is how Czech numbers are formatted:
Parsers.xparse(Float64, "1 042,1"; groupmark=' ', decimal=',')I don't think delim is defined by locale, e.g. in Czech, conventionally ; is the delimiter, but IIUC, this is not formalized (can't find it in ICU explorer) and a comma could be used as well (hopefully together with quoting).
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Ah yes, I should have clarified that if we're quoted, then we can allow delim == groupmark. Good call.
src/Parsers.jl
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| if !isnothing(groupmark) && ((groupmark == decimal || isnumeric(groupmark)) || (delim == groupmark && !quoted) || (oq == groupmark) || (cq == groupmark)) |
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Oh, |
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Inspired by the
grouping_markoption from the R packagereadr, this allows skipping certain characters used to format numbers. I avoided the termthousand_separatorsas different locals use these marks differently (e.g., indian numbering system would format the number 5000000 as50,00,000).