(*
  Source:  https://github.com/sunjay/lion
  License: MIT
*)

Statement = ( NamedFunction | AnonymousFunction | Assignment | Expr ) , "\n" ;
Expr = AnonymousFunction | Term | "(" , Expr , ")" ,
    { AnonymousFunction | Term | "(" , Expr , ")" } ;

Assignment = Symbol , "=" , Expr ;

AnonymousFunction = "\" , FunctionRHS ;
NamedFunction = Symbol , FunctionRHS ;

FunctionRHS = FunctionParams , "=" , FunctionBody ;
FunctionParams = FunctionParam , { FunctionParam } ;
FunctionParam = Term ;
FunctionBody = Expr ;

Term = Symbol | Number | SingleWordString ;
SingleWordString = '"' , Symbol , '"' ;
(* Symbol is a collection of valid symbol characters, not defined here *)
(* Number is a valid numeric literal *)