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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;
}
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