nud.go

func nud(acc interface{}, next token.Token) iterator {
  // Node{Token: token.Token{Type: token.PLUS, Literal: "+"}, Left: &Node{Token: token.Token{Type: token.INT, Literal: "2"}}}
  node := ast.Node{Token: &next}
  it := iterator{nud: &node}
  accIt, isIt := acc.(iterator)
  if isIt {
    // { , {... }
    node.Left = accIt.nud
    // save current stack
    it.stack = accIt.stack
  }
  // finish nud iteration
  if next.Type == token.INT {
    it.left = &node
    it.nud = nil
  }
  
  return it
}