| package java_cup.runtime; |
| |
| /** |
| * Defines the Scanner interface, which CUP uses in the default |
| * implementation of <code>lr_parser.scan()</code>. Integration |
| * of scanners implementing <code>Scanner</code> is facilitated. |
| * |
| * @version last updated 23-Jul-1999 |
| * @author David MacMahon <davidm@smartsc.com> |
| */ |
| |
| /* ************************************************* |
| Interface Scanner |
| |
| Declares the next_token() method that should be |
| implemented by scanners. This method is typically |
| called by lr_parser.scan(). End-of-file can be |
| indicated either by returning |
| <code>new Symbol(lr_parser.EOF_sym())</code> or |
| <code>null</code>. |
| ***************************************************/ |
| public interface Scanner { |
| /** Return the next token, or <code>null</code> on end-of-file. */ |
| public Symbol next_token() throws java.lang.Exception; |
| } |
