JavaScript functions as values

[randyzwitch]

I know it's not part of the JSON data format specification, but is there a way to pass JavaScript functions within JSON created by Julia?

So much of what I do in Julia involves generating JSON, and in some JavaScript libraries, the parser will evaluate functions (and seems that it is the JS library dev preference).

So is there a way to create something like:

{
    symbolSize: function (data) {
        return Math.sqrt(data[2]) / 5e2;
    }
}

[yuyichao]

Are you talking about a representation of J's functions? Or a transpiler

[randyzwitch]

I would just want to pass literal JS syntax as a value; were I to pass it as a String, it would be wrapped in double-quotes

On Sep 12, 2016, at 5:01 PM, Yichao Yu notifications@github.com wrote:

Are you talking about a representation of J's functions? Or a transpiler

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[TotalVerb]

I can put this on the todo list for #169.

[randyzwitch]

@TotalVerb Do you have an idea how to do this? I've been fooling with this using replace on the string representation post JSON.json(obj), but obviously it'd be much better to be part of the parser.

If you can give me a hint (if you know how to do it), I've got no problem trying to submit a PR. Thanks!

[TotalVerb]

@randyzwitch Let me see if I understand you. You want to go from Julia to JSON (serializing), with specific values in the resulting JSON not being quoted?

Do you need the other way too: going from JSON with some unquoted values to Julia?

[randyzwitch]

I just need to serialize, as my Julia output gets read into JavaScript.

Some of the functionality of the JavaScript library I'm wrapping can only be accessed by passing JS functions (which is not valid JSON, but is valid in JavaScript).

So I just want to pass a string literal without quoting, I don't want to transpile a Julia function to a JavaScript function.

On Sep 30, 2016, at 5:50 PM, Fengyang Wang notifications@github.com wrote:

@randyzwitch Let me see if I understand you. You want to go from Julia to JSON (serializing), with specific values in the resulting JSON not being quoted?

Do you need the other way too: going from JSON with some unquoted values to Julia?

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[TotalVerb]

This would be quite easy to do with #162, which I just opened for review. I included your use case as a test here. I don't know if it will be useful enough to be in JSON.jl itself, but I think in the long run it may be reasonable to have this and other custom serialization patterns in a package.

[randyzwitch]

Great! I’ll pull in the PR and test it out in my application, then comment on the PR.

On Sep 30, 2016, at 7:27 PM, Fengyang Wang notifications@github.com wrote:

This would be quite easy to do with #162 #162, which I just opened for review. I included your use case as a test https://github.com/TotalVerb/JSON.jl/blob/1de4701baa03ef7b3ad4b7413954e9b77b2a4a8e/test/serializer.jl here. I don't know if it will be useful enough to be in JSON.jl itself, but I think in the long run it may be reasonable to have this and other custom serialization patterns in a package.

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[randyzwitch]

I don't quite see how to use this (since it's not exported)...Since you're not planning on having this as part of the package, should I be placing the code for JS functions inside my package?

[TotalVerb]

I want to avoid having too many "niche" types in the package. Instead, it should be easy to roll your own type and have it "backed" by JSON.jl. So yes, I do suggest you to have that function and type (it isn't too many lines of code) in your package. Any interface suggestions are of course welcome.

[TotalVerb]

Addressed by #162.

[JobJob]

I'm in the same boat as Randy, just to be concrete, say I have:

immutable JSString
    s::String
end

JSON.lower(x::JSString) = x.s

jsfn = JSString("function (){ alert('heyyy!' }")

I'd like JSON.print(STDOUT, jsfn) to print without quotes, i.e. function (){ alert('heyyy!' } not "function (){ alert('heyyy!' }"

Is it correct to say that I just need to define:

JSON.show_json(io::JSON.Writer.StructuralContext, 
    s::JSON.Serializations.CommonSerialization, 
    x::JSString) = print(io, x.s)

?

I also want to support Dict("myfn"=>jsfn) and prob Arrays [jsfn1, jsfn2] if that makes a difference.