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package java_cup.runtime;
/**
* Defines the Scanner interface, which CUP uses in the default
* implementation of lr_parser.scan()
. Integration
* of scanners implementing Scanner
is facilitated.
*
* @version last updated 23-Jul-1999
* @author David MacMahon
*/
/* *************************************************
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
new Symbol(lr_parser.EOF_sym())
or
null
.
***************************************************/
public interface Scanner {
/** Return the next token, or null
on end-of-file. */
public Symbol next_token() throws java.lang.Exception;
}