01: package java_cup.runtime;
02:
03: /**
04: * Defines the Scanner interface, which CUP uses in the default
05: * implementation of <code>lr_parser.scan()</code>. Integration
06: * of scanners implementing <code>Scanner</code> is facilitated.
07: *
08: * @version last updated 23-Jul-1999
09: * @author David MacMahon <davidm@smartsc.com>
10: */
11:
12: /* *************************************************
13: Interface Scanner
14:
15: Declares the next_token() method that should be
16: implemented by scanners. This method is typically
17: called by lr_parser.scan(). End-of-file can be
18: indicated either by returning
19: <code>new Symbol(lr_parser.EOF_sym())</code> or
20: <code>null</code>.
21: ***************************************************/
22: public interface Scanner {
23: /** Return the next token, or <code>null</code> on end-of-file. */
24: public Symbol next_token() throws java.lang.Exception;
25: }
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