Method expr

basex-core/src/main/java/org/basex/query/QueryParser.java:1107–1118

Parses the "Expr" rule. @return query expression or null @throws QueryException query exception

()

   * @throws QueryException query exception
   */
  private Expr expr() throws QueryException {
    final Expr expr = single();
    if(expr == null) {
      if(more()) return null;
      throw alterError(NOEXPR);
    }

    if(!wsConsume(",")) return expr;
    final ExprList el = new ExprList().add(expr);
    do add(el, single()); while(wsConsume(","));
    return new List(info(), el.finish());
  }

  /**
   * Parses the "ExprSingle" rule.