Create method with empty parenthesis

[eed3si9n]

Hi!

I'm using treehugger to generate wrapper code for an API in Scala.js.
One problem I'm facing is that when Scala.js encounters a method

def get: Int

it transforms this into something like

obj["get"]

whereas

def get(): Int

is correctly transformed into

obj["get"]()

(note the parenthesis at the end).
As empty parenthesis are also used in normal Scala to denote a method with side-effects, I was wondering if treehugger supports generating such methods.
Actually, the documentation contains an example where a method with empty parenthesis is generated, but I can't reproduce that locally.

If you point me in the right direction I can also try to create a PR for this.

Thanks!
Martin

[onsails]

👍

[eed3si9n]

For a declaration (without implementation), DEF either needs to be converted implicitly into a tree, or you can call .tree method as follows:

import treehugger.forest._
import definitions._
import treehuggerDSL._

scala> val t = DEF("get", IntClass).tree
t: treehugger.forest.DefDef = DefDef(Modifiers(, , Map()),get,List(),List(List()),TypeTree(),EmptyTree)

scala> treeToString(t)
res0: String = def get: Int

[nightscape]

Hi Eugene,

my problem is not that I want to create a DEF with an empty body.
I want to create a DEF with empty parenthesis, so I need

def get(): Int

instead of

def get: Int

This is due to a convention of Scala.js (see "Remarks" under http://www.scala-js.org/doc/calling-javascript.html) that states that methods without parenthesis are compiled to a property lookup and methods with parenthesis to a function call.

[eed3si9n]

Oh you actually want the parens. Sorry I got this other way around.

[nightscape]

Nice, exactly that :D

Thanks Eugene!

[eed3si9n]

0.4.1 is released with the change.