net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/text/JavaWordFinder.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation 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 API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.text;
  12
  13 import net.sourceforge.phpdt.internal.compiler.parser.Scanner;
  14
  15 import org.eclipse.jface.text.BadLocationException;
  16 import org.eclipse.jface.text.IDocument;
  17 import org.eclipse.jface.text.IRegion;
  18 import org.eclipse.jface.text.Region;
  19
  20 public class JavaWordFinder {
  21
  22         public static IRegion findWord(IDocument document, int offset) {
  23
  24                 int start = -1;
  25                 int end = -1;
  26
  27                 try {
  28
  29                         int pos = offset;
  30                         char c = ' ';
  31
  32                         while (pos >= 0) {
  33                                 c = document.getChar(pos);
  34                                 if (c == '$') {
  35                                         --pos;
  36                                         break;
  37                                 }
  38                                 if (!Scanner.isPHPIdentifierPart(c))
  39                                         break;
  40
  41                                 --pos;
  42                         }
  43
  44                         start = pos;
  45
  46                         pos = offset;
  47                         int length = document.getLength();
  48
  49                         while (pos < length) {
  50                                 c = document.getChar(pos);
  51                                 if (!Scanner.isPHPIdentifierPart(c))
  52                                         break;
  53                                 ++pos;
  54                         }
  55
  56                         end = pos;
  57
  58                 } catch (BadLocationException x) {
  59                 }
  60
  61                 if (start > -1 && end > -1) {
  62                         if (start == offset && end == offset)
  63                                 return new Region(offset, 0);
  64                         else if (start == offset)
  65                                 return new Region(start, end - start);
  66                         else
  67                                 return new Region(start + 1, end - start - 1);
  68                 }
  69
  70                 return null;
  71         }
  72 }