net.sourceforge.phpeclipse/src/net/sourceforge/phpeclipse/phpeditor/php/PHPWordExtractor.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 net.sourceforge.phpdt.internal.compiler.parser.Scanner;
  15
  16 import org.eclipse.jface.text.BadLocationException;
  17 import org.eclipse.jface.text.IDocument;
  18 import org.eclipse.swt.graphics.Point;
  19
  20 /**
  21  * Detects PHP words in documents.
  22  */
  23 public class PHPWordExtractor {
  24
  25         /**
  26          * Find the location of the word at offset in document.
  27          * @returns Point - x is the start position, y is the end position.
  28          *      Return null if it is not found.
  29          * @param document the document being searched.
  30          * @param offset - the position to start searching from.
  31          */
  32         public static Point findWord(IDocument document, int offset) {
  33
  34                 int start = -1;
  35                 int end = -1;
  36
  37                 try {
  38
  39                         int position = offset;
  40                         char character;
  41
  42                         while (position >= 0) {
  43                                 character = document.getChar(position);
  44                                 if (!Scanner.isPHPIdentifierPart(character) && (character != '$'))
  45                                         break;
  46                                 --position;
  47                         }
  48
  49                         start = position;
  50
  51                         position = offset;
  52                         int length = document.getLength();
  53
  54                         while (position < length) {
  55                                 character = document.getChar(position);
  56                                 if (!Scanner.isPHPIdentifierPart(character) && (character != '$'))
  57                                         break;
  58                                 ++position;
  59                         }
  60
  61       start++;
  62                         end = position;
  63
  64                         if (end > start)
  65                                 return new Point(start, end - start);
  66
  67                 } catch (BadLocationException x) {
  68                 }
  69
  70                 return null;
  71         }
  72 }