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Last change
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| 1 | package java_cup.runtime;
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| 2 |
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| 3 | /**
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| 4 | * Defines the Scanner interface, which CUP uses in the default
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| 5 | * implementation of <code>lr_parser.scan()</code>. Integration
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| 6 | * of scanners implementing <code>Scanner</code> is facilitated.
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| 7 | *
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| 8 | * @version last updated 23-Jul-1999
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| 9 | * @author David MacMahon <[email protected]>
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| 10 | */
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| 11 |
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| 12 | /* *************************************************
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| 13 | Interface Scanner
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| 14 |
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| 15 | Declares the next_token() method that should be
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| 16 | implemented by scanners. This method is typically
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| 17 | called by lr_parser.scan(). End-of-file can be
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| 18 | indicated either by returning
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| 19 | <code>new Symbol(lr_parser.EOF_sym())</code> or
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| 20 | <code>null</code>.
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| 21 | ***************************************************/
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| 22 | public interface Scanner {
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| 23 | /** Return the next token, or <code>null</code> on end-of-file. */
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| 24 | public Symbol next_token() throws java.lang.Exception;
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| 25 | }
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