Comments (7)
@michalmuskala Like this: https://github.com/talentdeficit/jsx#incomplete-input
Something, what allows to decode json partially on the fly without needing to get the whole json.
from jason.
Also, how about streaming encoding, when your top-level input term can be guaranteed to be Enumerable
?
Basically, an API function to do this (with perhaps lower overhead):
Stream.concat([
["[\n"],
my_huge_stream |> Stream.map(&Jason.encode_to_iodata!) |> Stream.intersperse(",\n"),
["]"]
])
|> Enum.into(File.stream!("foo"))
from jason.
What exactly do you mean by streaming?
from jason.
I think they mean SAX-style support for reading maybe? I guess?
from jason.
Ah. Thanks. I think such a feature indeed makes sense.
I even did some work on implementing it in #3, but ultimately abandoned it before 1.0 due to complexity, but I think it makes sense to implement it now. This should also allow decoding directly from iodata without converting to a single string first, which might also help with performance in some cases.
The only problem with streaming decoding is handling of numbers - you never know when they end, but I think it will be reasonable to require top-level values to be either strings, objects or arrays.
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Any news on this? I'm willing to pitch in if it helps move things on, but I've no idea where to start.
from jason.
As mentioned in #34 if your JSON is line-delimited (and in most "streaming" cases it actually is), the problem is trivial - split on newlines and feed each part separately to Jason.decode/2
.
Full streaming implementation is going to be rather complex and will require significant changes to the parser - the simplest approach would be to return a continuation at each point in the parser where it errors with the "unexpected eof" error. Later the user could call the continuation with more data.
There was some initial work in #3, but I abandoned it in favour of releasing 1.0 faster. Unfortunately, I probably won't have time to work on this soon.
from jason.
Related Issues (20)
- [QUESTION] Jason with UTF-8 characters HOT 2
- Problem decoding a array with value "[88]", returns "X" HOT 1
- feature request: Filtering function for maps HOT 1
- Jason.decode crashes when encountering complex emoji codepoints HOT 4
- Decode failing when string has lots of spaces and special characters HOT 1
- Jason opts argument .encode clarification HOT 4
- Jason.Decoder is not a protocol HOT 1
- html_safe encoding bug HOT 1
- Jason.decode timeouts silently with large files HOT 5
- Jason fails to encode HOT 1
- Better error messaging on invalid escapes
- Issue decoding particular string HOT 5
- fails to install in rebar3 HOT 2
- Proposal: Consistent number decoding
- Configure Jason to parse keys as atoms by default for Phoenix HOT 2
- Support JSON Canonical Scheme (JCS) - RFC 8785 HOT 2
- Json file can not be decoded HOT 1
- Heads up: Jason will be an ExDoc dependency HOT 1
- Map key validity/order in Elixir 1.14 HOT 3
- Misformatted README HOT 1
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