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Java > Open Source Codes > org > netbeans > modules > lexer > demo > handcoded > plain > PlainLexer


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19
20 package org.netbeans.modules.lexer.demo.handcoded.plain;
21
22 import org.netbeans.api.lexer.Language;
23 import org.netbeans.api.lexer.Lexer;
24 import org.netbeans.api.lexer.LexerInput;
25 import org.netbeans.api.lexer.TokenId;
26 import org.netbeans.api.lexer.Token;
27
28 /**
29  * Lexer that recognizes PlainLanguage.
30  *
31  * @author Miloslav Metelka
32  * @version 1.00
33  */
34
35 final class PlainLexer implements Lexer {
36
37     private static final PlainLanguage language = PlainLanguage.get();
38
39     private LexerInput lexerInput;
40
41     public PlainLexer() {
42     }
43
44     public Object JavaDoc getState() {
45         return null;
46     }
47
48     public void restart(LexerInput input, Object JavaDoc state) {
49         this.lexerInput = input;
50     }
51
52     public Token nextToken() {
53         int ch = lexerInput.read();
54         while (ch != LexerInput.EOF && ch != '\n') {
55             ch = lexerInput.read();
56         }
57         
58         return (lexerInput.getReadLength() > 0) // read one or more chars
59 ? lexerInput.createToken(PlainLanguage.TEXT)
60             : null; // was immediate EOF on input
61 }
62     
63 }
64
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