net.sourceforge.phpeclipse.ui/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  www.phpeclipse.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          *
  28          * @returns Point - x is the start position, y is the end position. Return
  29          *          null if it is not found.
  30          * @param document
  31          *            the document being searched.
  32          * @param offset -
  33          *            the position to start searching from.
  34          */
  35         public static Point findWord(IDocument document, int offset) {
  36
  37                 int start = -1;
  38                 int end = -1;
  39
  40                 try {
  41
  42                         int position = offset;
  43                         char character;
  44
  45                         while (position >= 0) {
  46                                 character = document.getChar(position);
  47                                 if (!Scanner.isPHPIdentifierPart(character)
  48                                                 && (character != '$'))
  49                                         break;
  50                                 --position;
  51                         }
  52
  53                         start = position;
  54
  55                         position = offset;
  56                         int length = document.getLength();
  57
  58                         while (position < length) {
  59                                 character = document.getChar(position);
  60                                 if (!Scanner.isPHPIdentifierPart(character)
  61                                                 && (character != '$'))
  62                                         break;
  63                                 ++position;
  64                         }
  65
  66                         start++;
  67                         end = position;
  68
  69                         if (end > start)
  70                                 return new Point(start, end - start);
  71
  72                 } catch (BadLocationException x) {
  73                 }
  74
  75                 return null;
  76         }
  77 }