func ExampleRegister_sandbox() {
const code = `
Print("foo")
Print(io ~= nil)
Print(os == nil)
`
L := luar.Init()
defer L.Close()
res := L.LoadString(code)
if res != 0 {
msg := L.ToString(-1)
fmt.Println("could not compile", msg)
}
// Create a empty sandbox.
L.NewTable()
// "*" means "use table on top of the stack."
luar.Register(L, "*", luar.Map{
"Print": fmt.Println,
})
env := luar.NewLuaObject(L, -1)
G := luar.Global(L)
// We can copy any Lua object from "G" to env with 'Set', e.g.:
// env.Set("print", G.Get("print"))
// A more convenient and efficient way is to do a bulk copy with 'Setv':
env.Setv(G, "print", "io")
// Set up sandbox.
L.SetfEnv(-2)
// Run 'code' chunk.
err := L.Call(0, 0)
if err != nil {
fmt.Println("could not run", err)
}
// Output:
// foo
// true
// true
}
func main() {
L := luar.Init()
defer L.Close()
gettop := func() {
fmt.Println("top", L.GetTop())
}
gettop()
// compile chunk
res := L.LoadString(test)
if res != 0 {
msg := L.ToString(-1)
fmt.Println("could not compile", msg)
}
// create environment for chunk
L.NewTable()
// "*" means use table on stack....
luar.Register(L, "*", luar.Map{
"Print": fmt.Println,
})
env := luar.NewLuaObject(L, -1)
G := luar.Global(L)
//~ env.Set("print",G.Get("print"))
//~ env.Set("io",G.Get("io"))
// more convenient/efficient way to do a bulk copy
env.Setv(G, "print", "io")
L.SetfEnv(-2)
// run chunk
err := L.Call(0, 0)
if err != nil {
fmt.Println("could not run", err)
}
}