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Java > Open Source Codes > java_cup > runtime > Scanner


1 package java_cup.runtime;
2
3 /**
4  * Defines the Scanner interface, which CUP uses in the default
5  * implementation of <code>lr_parser.scan()</code>. Integration
6  * of scanners implementing <code>Scanner</code> is facilitated.
7  *
8  * @version last updated 23-Jul-1999
9  * @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 JavaDoc;
25 }
26
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