java_cup.runtime.Scanner Maven / Gradle / Ivy
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* Copyright 2021 EPAM Systems, Inc
*
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. Licensed under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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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 [email protected]
*/
/* *************************************************
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;
}