public void NullaryFunctionIsApplication()
{
var grammar = Grammar.FromFile(grammarFile);
var expr1 = grammar.ReadExpression("asdfasdf asd");
//Assert.IsInstanceOf<Function> (expr1);
Assert.IsInstanceOf <ApplicationExpression>(expr1);
var expr2 = grammar.ReadExpression("asdf (xaxa lala) (xaxa lala kaka)");
var vstr = new Expression.Visitor <string>();
Func <IEnumerable <Expression>, IEnumerable <string> > ag = args => args.Select(a => a.Accept(vstr));
vstr.fVisitApplication = (fn, args) => $"_{fn}({String.Join(",", ag(args))})";
var outString2 = expr2.Accept(vstr);
//Assert.AreEqual ("_asdf", outString);
Assert.AreEqual("_asdf(_xaxa(_lala()),_xaxa(_lala(),_kaka()))", outString2);
}
internal abstract R Accept <R>(Expression.Visitor <R> vistor);