Nested chains ?

[atthom]

I am currently doing day 4 of adventofcode.com

Much of the job is just text parsing and I managed to do it with a nice "one-liner" thanks to this very neat package!

is_valid(pass) = (length(pass) == 8) | ((length(pass) == 7) & ("cid" ∉ pass))

sol = @chain "./data/passport.txt" begin
    read(_, String)
    split(_, "\n\n")
    map(x -> replace(x, "\n" => " "), _)
    map(x -> split(x, " "), _)
    map(x -> map(y -> split(y, ":")[1], x), _)
    filter(is_valid, _)
    length
end

However, I found the maps and the map of a map difficult to read and I was unable to use nested chains (and the documentation).

Is it possible to do it with nested chains?

Some example string:

ecl:gry pid:860033327 eyr:2020 hcl:#fffffd
byr:1937 iyr:2017 cid:147 hgt:183cm

iyr:2013 ecl:amb cid:350 eyr:2023 pid:028048884
hcl:#cfa07d byr:1929

hcl:#ae17e1 iyr:2013
eyr:2024
ecl:brn pid:760753108 byr:1931
hgt:179cm

hcl:#cfa07d eyr:2025 pid:166559648
iyr:2011 ecl:brn hgt:59in

It's not really a bug so I would understand if you just close the issue.