KickJava   Java API By Example, From Geeks To Geeks.

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


1 /*
2  * TclSyntaxIterator.java
3  *
4  * Copyright (C) 2002 Peter Graves
5  * $Id: TclSyntaxIterator.java,v 1.1.1.1 2002/09/24 16:09:10 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 TclSyntaxIterator extends DefaultSyntaxIterator
27 {
28     private static final int STATE_NEUTRAL = 0;
29     private static final int STATE_SINGLEQUOTE = 1;
30     private static final int STATE_DOUBLEQUOTE = 2;
31
32     public TclSyntaxIterator(Position pos)
33     {
34         super(pos);
35     }
36
37     public char[] hideSyntacticWhitespace(Line line)
38     {
39         return hideSyntacticWhitespace(line.getText());
40     }
41
42     // Returns char array with syntactic whitespace (quotes and comments)
43 // replaced with actual space characters.
44 public char[] hideSyntacticWhitespace(String JavaDoc s)
45     {
46         final char[] chars = s.toCharArray();
47         int state = STATE_NEUTRAL;
48         final int length = chars.length;
49         for (int i = 0; i < length; i++) {
50             char c = chars[i];
51             if (c == '\\' && i < length-1) {
52                 // Escape character.
53 chars[i++] = ' ';
54                 chars[i] = ' ';
55                 continue;
56             }
57             if (state == STATE_SINGLEQUOTE) {
58                 chars[i] = ' ';
59                 if (c == '\'')
60                     state = STATE_NEUTRAL;
61                 continue;
62             }
63             if (state == STATE_DOUBLEQUOTE) {
64                 chars[i] = ' ';
65                 if (c == '"')
66                     state = STATE_NEUTRAL;
67                 continue;
68             }
69             // Reaching here, STATE_NEUTRAL...
70 if (c == '\'') {
71                 chars[i] = ' ';
72                 state = STATE_SINGLEQUOTE;
73                 continue;
74             }
75             if (c == '"') {
76                 chars[i] = ' ';
77                 state = STATE_DOUBLEQUOTE;
78                 continue;
79             }
80             if (c == '/') {
81                 if (i < length-1) {
82                     if (chars[i+1] == '/') {
83                         // "//" comment starting
84 for (int j = i; j < length; j++)
85                             chars[j] = ' ';
86                         return chars;
87                     }
88                 }
89             }
90         }
91         return chars;
92     }
93 }
94
Popular Tags