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>.
******************************************************************************/
@SuppressWarnings (
{ "all" } )
public interface Scanner
{
/** Return the next token, or <code>null</code> on end-of-file. */
public Symbol next_token () throws java.lang.Exception;
}