What is proper way to run multi-line expr scripts? I seem to get errors when trying...

[vultj]

Hello!

I am playing with expr and my use case is multi-line re-use expr scripts, am trying to do that like so:

func main() {
	env := map[string]interface{}{
		"println": fmt.Println,
	}

	code := `
let foo = "asdf";
let bar = "fsda";
println(foo);
println(bar)
`

	program, err := expr.Compile(code, expr.Env(env))
	if err != nil {
		panic(err)
	}

	output, err := expr.Run(program, env)
	if err != nil {
		panic(err)
	}

	fmt.Println(output)
}

I've tried variations of println(foo), no ;, etc. But it seems like I can only execute one func at a time?

I get either the following errors:

panic: unexpected token Operator(";") (4:13)
	 | println(foo);
	 | ............^

panic: unexpected token Identifier("println") (5:1)
	 | println(bar)
	 | ^

[antonmedv]

Currenly there is no way to do those. As Expr is designed to work with expressions.

One "hack" to overcome this, is to return an expression:

let foo = "asdf";
let bar = "fsda";
[
  println(foo),
  println(bar),
]

Also I think we should add support for statments in Expr as well via a feature flag.