Lyng: scripting lang for kotlin multiplatform

in the form of multiplatform library. Key benefits:

• async and multithreaded (on JVM and native) out of the box
• easy and efficient kotlin integration
• dynamic types yet with good checks

current state of implementation and docs:

• introduction and tutorial
• Samples directory

Integration in Kotlin multiplatform

Add library

TBD

Execute script:

assertEquals("hello, world", eval(""" 
    "hello, " + "world" 
    """).toString())

Exchanging information

Script is executed over some Context. Create instance of the context, add your specific vars and functions to it, an call over it:

val context = Context().apply {
    addFn("addArgs") {
        var sum = 0.0
        for( a in args) sum += a.toDouble()
        ObjReal(sum)
    }
    addConst("LIGHT_SPEED", ObjReal(299_792_458.0))
}

context.eval("addArgs(1,2,3)") // <- 6

Note that the context stores all changes in it so you can make calls on a single context to preserve state between calls.

Why?

Designed to add scripting to kotlin multiplatform application in easy and efficient way. This is attempt to achieve what Lua is for C/++.

• fast start (times and times faster than initializing v8/wasm)
• fast and simple kotlin interoperability
• coroutine-based, truly async. On platforms with multithreading, run multithreaded. No python/ruby/javascript threads hell.
• small footprint
• absolutely safe: no access to any dangerous or sensitive functions until you specifically provide it.

Language

• dynamic
• async
• multithreaded (coroutines could be dispatched using threads on appropriate platforms, automatically)

By-stage

Here are plans to develop it:

First stage

Interpreted, precompiled into threaded code, actually. Dynamic types.

Second stage

Will add:

• optimizations
• p-code serialization
• static typing