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# feed
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Big Chungus
10/14/2021, 10:53 AMEver wanted to just build a nice json in kotlin, but found raw string templates hard to keep pretty? Well turns out you can make full json DSL with just a few lines of code.
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K 3
👌 10
mind blown 3
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Serializes to this
Copy code
{
"boolean": true,
"number": 1,
"string": "str",
"null": null,
"array": [
1,
"str",
null,
{},
[
1,
"2",
null,
3
]
],
"object": {
"boolean": true,
"number": 1,
"string": "str",
"null": null,
"array": [
1,
"str",
null
]
}
}r
Robert Jaros
10/14/2021, 11:05 AMSerializes with what? kotlinx.serialization?
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Big Chungus
10/14/2021, 11:06 AMWith whatever you choose. This just builds a map representation of json.
i.e. It doesn't depend on any serialization voodoo to work.
But for transparency, I ran the generated map through Jackson to get that json output.
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a
arekolek
10/14/2021, 12:17 PMYou can also use the "inject language" feature in the IDE
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b
Big Chungus
10/14/2021, 12:26 PMI'm aware, but I found that hard to maintain in terms of formatting. Plus it adds lots of
$$j
Javier
10/14/2021, 2:07 PMkotlin serialization had something similar to this no? but they changed to
build...b
Big Chungus
10/14/2021, 2:09 PMDid they? I'm not aware of that. Got a link?
j
Javier
10/14/2021, 2:10 PMI can't found one, it was removed a lot of months ago
byoperator fun equalsb
Big Chungus
10/14/2021, 2:20 PMHmm, good idea! Or +=
Not sure which is better
j
Javier
10/14/2021, 2:35 PMpersonally when I create manually a Json I always fail and I use = instead of :
that is the reason I thought in = hahah
any way, are you going to publish it as KMP library? not a lot of code, but it can be used in a lot of projects so avoid copypasting can be great
t
Tobias Berger
10/14/2021, 2:41 PMsomething interesting I saw in a DSL for JSON objects once: instead of the
byrangeTo Copy code
{
"number" by 1
} Copy code
{
"number"..1
}:😂 2
@Javier
equals===j
jimn
10/14/2021, 3:04 PMi like operator %, it has two dots also https://gist.github.com/jnorthrup/51f2b23bde522bb03d74aa552c295f6b
it feels like there are some wicked delegation opportunities
j
Javier
10/14/2021, 3:06 PMah, not sure if
===t
Tobias Berger
10/14/2021, 3:08 PM===j
Javier
10/14/2021, 3:09 PMyeah, but there is no another operator for it no?
maybe
to=👆 2
j
jimn
10/14/2021, 3:39 PM Copy code
infix operator fun String.rem(value: Any?) = this `⁚` value //two escaped dots if inlined
@JSSetterDsl
/**
* set primitive
*/
infix fun String.`⁚`(t: Any?) { map[this] = t }
...
val `{}` by lazy { JSObj().apply(fun JSObj.() = Unit) }b
Big Chungus
10/14/2021, 3:53 PMBackticks are a big nono for mpp projects thanks to js 😀
j
Javier
10/14/2021, 4:01 PMand they are hard to write, sadly
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Big Chungus
10/14/2021, 5:05 PMOk well, I went ahead and published that as an MPP lib 😄 It even builds json strings for you! kon@1.0.0 is out! All proposed setters are supported with the exception of
==K 1
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🆒 1
j
Javier
10/14/2021, 6:44 PM Copy code
Modules
kon - wrapper modulethis link is broken
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Big Chungus
10/14/2021, 6:45 PMWhat do you mean?
Nvm, figured it out and fixed it
o
Oliver.O
10/14/2021, 9:01 PMI like the idea but I'm worried about the operator overkill: Code written by multiple persons can become hard to read if one person would use
by%to👍 2
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Big Chungus
10/14/2021, 10:38 PMI had same thoughts. I'll use it in my own projects for the next week and will decide on what feels most natural. The rest will be removed. Also I'm a bit iffy about using to as there's an infix function like that in stdlib already used to build pairs. Shadowing might be an issue
j
Javier
10/14/2021, 10:47 PMI think
tob
Big Chungus
10/14/2021, 11:49 PMHow about just +? It's the same hey on the keyboard
Although it doesn't convey the intent as well...
j
Javier
10/15/2021, 2:01 AM+ for standalone values is fine, but in json there are not standalone values, semantically looks strange
e
ephemient
10/15/2021, 9:20 AMdid anybody bring up the json builders in kotlinx.serialization? they're a bit more verbose but they do exist (buildJsonObject, buildJsonArray, etc.)
b
Big Chungus
10/15/2021, 9:22 AM@Javier did but couldn't get a link 😄 Also to get them you have to bring in entire serialization lib (heavy), which might not always be what you want.
j
Javier
10/15/2021, 9:24 AMMaybe you can find the commit where they moved to
build...Another cool thing you can add to your lib, is compatibility with Kotlin Serialization
so you generate a
JsonElementb
Big Chungus
10/15/2021, 9:25 AMI'm thinking of adding that as a new module. So ppl could still use it without serialization
e
ephemient
10/15/2021, 9:27 AMhttps://github.com/Kotlin/kotlinx.serialization/pull/881 - before kotlinx.serialization-1.0.0
o
Oliver.O
10/15/2021, 11:09 AM@ephemient Thanks for bringing that up. Some thoughts: The
kotlinx.serializationputtob
Big Chungus
10/15/2021, 1:33 PMApologies for the spam, but kon@1.1.0 is out with standardised setters and optional kontinx-serialization-json support for two-way conversions between
KONJsonObject👍 4
m
Matteo Mirk
10/15/2021, 3:10 PMyeah this is better! When I saw all those different operators to perform the same action i was very confused
e
ephemient
10/15/2021, 8:30 PM"array"[1] Copy code
kobj {
"scalar" to 1
"object".to { ... }
"array".to[ ... ]
}b
Big Chungus
10/15/2021, 9:37 PMWhy is String[] an issue? That extension is only available in kobject scope and hooks onto string class
Or do you mean string char accessor overlap?
I'll do some testing to see how relevant it actually is
e
ephemient
10/15/2021, 10:36 PMyes, it'll resolve to String.get over your extension
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