b0c471beccc0852dee4a7fca81d37e825e3f74d2
[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpeclipse / phpeditor / php / PHPWordDetector.java
1 /**********************************************************************
2 Copyright (c) 2000, 2002 IBM Corp. and others.
3 All rights reserved. This program and the accompanying materials
4 are made available under the terms of the Common Public License v1.0
5 which accompanies this distribution, and is available at
6 http://www.eclipse.org/legal/cpl-v10.html
7
8 Contributors:
9     IBM Corporation - Initial implementation
10     Klaus Hartlage - www.eclipseproject.de
11 **********************************************************************/
12 package net.sourceforge.phpeclipse.phpeditor.php;
13
14 import org.eclipse.swt.graphics.Point;
15 import org.eclipse.jface.text.BadLocationException;
16 import org.eclipse.jface.text.IDocument;
17
18 /**
19  * Detects PHP words in documents.
20  */
21 public class PHPWordDetector {
22
23         /**
24          * Find the location of the word at offset in document.
25          * @returns Point - x is the start position, y is the end position.
26          *      Return null if it is not found.
27          * @param document the document being searched.
28          * @param offset - the position to start searching from.
29          */
30         public static Point findWord(IDocument document, int offset) {
31
32                 int start = -1;
33                 int end = -1;
34
35                 try {
36
37                         int position = offset;
38                         char character;
39
40                         while (position >= 0) {
41                                 character = document.getChar(position);
42                                 if (!Character.isJavaIdentifierPart(character) && (character != '$'))
43                                         break;
44                                 --position;
45                         }
46
47                         start = position;
48
49                         position = offset;
50                         int length = document.getLength();
51
52                         while (position < length) {
53                                 character = document.getChar(position);
54                                 if (!Character.isJavaIdentifierPart(character) && (character != '$'))
55                                         break;
56                                 ++position;
57                         }
58
59                         end = position;
60
61                         if (end > start)
62                                 return new Point(start, end - start);
63
64                 } catch (BadLocationException x) {
65                 }
66
67                 return null;
68         }
69 }