While.Parsing.Parser.Terminal C# (CSharp) Метод

        void Terminal(out Expression exp)
        {
            exp = null;
            if (la.kind == 1) {
            Get();
            exp = new Variable(t.val);
            if (!SymbolTable.IsInScope(t.val) && !Options.BookVersion) {
                errors.SemErr(t.line, t.col, string.Format("Undeclared variable '{0}'", t.val));
            }

            } else if (la.kind == 2) {
            Get();
            exp = new Number(int.Parse(t.val));
            } else if (la.kind == 47) {
            Get();
            exp = new Bool(true);
            } else if (la.kind == 48) {
            Get();
            exp = new Bool(false);
            } else if (la.kind == 6) {
            Get();
            Expr(out exp);
            Expect(9);
            } else SynErr(56);
        }