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Java > Open Source Codes > org > armedbear > j > VHDLSyntaxIterator


1 /*
2  * VHDLSyntaxIterator.java
3  *
4  * Copyright (C) 2002 Peter Graves
5  * $Id: VHDLSyntaxIterator.java,v 1.1.1.1 2002/09/24 16:09:28 piso Exp $
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 package org.armedbear.j;
23
24 // Supports movement through the syntactically important text of a buffer, i.e.
25 // skipping whitespace and comments.
26 public final class VHDLSyntaxIterator extends DefaultSyntaxIterator
27 {
28     private static final int STATE_NEUTRAL = 0;
29     private static final int STATE_DOUBLEQUOTE = 1;
30
31     public VHDLSyntaxIterator(Position pos)
32     {
33         super(pos);
34     }
35
36     public char[] hideSyntacticWhitespace(Line line)
37     {
38         return hideSyntacticWhitespace(line.getText());
39     }
40
41     // Returns char array with syntactic whitespace (quotes and comments)
42 // replaced with actual space characters.
43 public char[] hideSyntacticWhitespace(String JavaDoc s)
44     {
45         final char[] chars = s.toCharArray();
46         int state = STATE_NEUTRAL;
47         final int length = chars.length;
48         for (int i = 0; i < length; i++) {
49             char c = chars[i];
50             if (c == '\\' && i < length-1) {
51                 // Escape character.
52 chars[i++] = ' ';
53                 chars[i] = ' ';
54                 continue;
55             }
56             if (state == STATE_DOUBLEQUOTE) {
57                 chars[i] = ' ';
58                 if (c == '"')
59                     state = STATE_NEUTRAL;
60                 continue;
61             }
62             // Reaching here, STATE_NEUTRAL...
63 if (c == '"') {
64                 chars[i] = ' ';
65                 state = STATE_DOUBLEQUOTE;
66                 continue;
67             }
68             if (c == '-') {
69                 if (i < length-1) {
70                     if (chars[i+1] == '-') {
71                         // "//" comment starting
72 for (int j = i; j < length; j++)
73                             chars[j] = ' ';
74                         return chars;
75                     }
76                 }
77             }
78         }
79         return chars;
80     }
81 }
82
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