KLua is a Lua interpreter written in Kotlin, based on Kotlinx.coroutines. It currently only supports JVM, but should be easy to port once context receivers become available on other platforms.
- Based on Lua 5.4.6
- Coroutines are implemented natively using Kotlinx.coroutines
Running snippets of Lua is simple:
val engine = LuaInterpreter()
engine.execute("print('Hello, world!')")However, in some cases you may want to safeguard your application from malicious code, by removing e.g. io access.
val engine = LuaInterpreter()
engine.execute("print('Hello, world!')") { env: TTable ->
env["io"] = TNil // Remove io library from _ENV (= _G)
}Registering custom types or methods is also fairly straightforward:
class Counter {
var value = 0
}
val engine = LuaInterpreter()
engine.execute("...") { env: TTable ->
env["my_function"] = TFunction { args: List<TValue> ->
val action = args.argument(0, TNumber::class)
val value = action.value.toLong()
when (value) {
0L -> return_(TString("Hello, world!")) // Return a value
1L -> yield(TString("Hello, world!")) // Yield a value
else -> error("Invalid action") // Emit an error
}
}
env["some_counter"] = TUserdata(Counter()) // Methods can be added using the __index metamethod
}