Call a CompiledFunction from host about tengo HOT 2 CLOSED

Ah, now i finally understand how fn works in your go-fsm.

As for the usecase this is more of a performance check. I'm writing a go version of a logitech g13 trigger server[1]. But i would like to provide a way to define what would happen when the keys are triggered, but as it is for gaming input performance is important so i'm checking if i can get the script time down to an acceptable level.

A goja test script example:

bind := Bind{}

vm := goja.New()

vm.Set("KEY", func(call goja.FunctionCall) goja.Value {
	return vm.ToValue(KEY[call.Arguments[0].ToString().String()])
})

vm.RunString(`
	var keys = [KEY('LEFTSHIFT'), KEY('HOME')];
	function Down(state, keyboard, mouse) {
		keyboard.KeyDown(keys);
	}
	function Up(state, keyboard, mouse) {
		keyboard.KeyUp(keys)
		mouse.Click(state.X, state.Y)
	}
`)

vm.ExportTo(vm.Get("Down"), &bind.Down)
vm.ExportTo(vm.Get("Up"), &bind.Up)

But i think i have what i need to get it working now. Thanks for the quick response!

[1] https://github.com/ecraven/g13

from tengo.

Hi! Can you tell me more about use cases so I can better help? Basically a compiled function is bytecode-compiled meaning it is supposed to be executed on the VM. Without knowing your use cases, my recommendation is to

• write the script that takes some global variables as inputs and assign outputs as global variables as well
• compile the script to get a compiled script instance.
• set input variables through compiled script, run it, and get the output values.

This way you can "execute" the script with different input values without compiling them every time.

s := script.New([]byte(`out := in * 5`))
s.Add("in", 0) // placeholder just to compile the script
c, _ := s.Compile() // pre-compile everything at this point

// actual executions
c.Set("in", 5) // assign input value(s)
_ = c.Run()
fmt.Println(c.Get("out").Value()) // prints 10

c.Set("in", 10) // assign input value(s)
_ = c.Run()
fmt.Println(c.Get("out").Value()) // prints 20

from tengo.