On Mon, 28 Feb 2022 at 16:56, Dan Book <grinnz@gmail.com> wrote: > On Mon, Feb 28, 2022 at 3:27 AM Philippe Bruhat (BooK) <book@cpan.org> > wrote: > >> When parsing `{ "a" : 2, "b": "c" }`, all that Perl reads is text. How >> would a pure Perl JSON parser decode that `2` from the input source and >> keep it in memory as if it was always the number 2? >> > > That's not the case - JSON parsers are aware whether they are parsing a > number or a string because the JSON grammar is distinct, and can create the > scalar differently depending. Not like e.g. certain databases where you > can't always tell the type of the response values. Cpanel::JSON::XS::Type > uses this information to return a type schema which you can already use to > round-trip the output - these sort of changes enable more opportunities. > I think the point here is "how does pure perl say 'this string in $x was always a number'". Extracting the number 2 from a string of JSON is easy enough, presumably `substr` or regex were involved to get to that point - but how do we then set the "this was originally a number" flag to make the roundtrip work? Hopefully something in `builtin` or equivalent will provide that, rather than requiring XS calls to internal APIs!Thread Previous | Thread Next