Locates the start of the word at the specified position. : Text EditorPane « Swing JFC « Java

1. Java
2. Swing JFC
3. Text EditorPane

Locates the start of the word at the specified position.

    
/*
 * TextUtilities.java - Utility functions used by the text area classes
 * Copyright (C) 1999 Slava Pestov
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */



import javax.swing.text.BadLocationException;
import javax.swing.text.Document;

/**
 * Class with several utility functions used by the text area component.
 * 
 * @author Slava Pestov
 * @version $Id$
 */
public class TextUtilities
{
  /**
   * Locates the start of the word at the specified position.
   * 
   * @param line
   *           The text
   * @param pos
   *           The position
   */
  public static int findWordStart( String line, int pos, String noWordSep )
  {
    char ch = line.charAt( pos - 1 );

    if( noWordSep == null )
      noWordSep = "";
    boolean selectNoLetter = ( !Character.isLetterOrDigit( ch ) && noWordSep.indexOf( ch ) == -1 );

    int wordStart = 0;
    for( int i = pos - 1; i >= 0; i-- )
    {
      ch = line.charAt( i );
      if( selectNoLetter ^ ( !Character.isLetterOrDigit( ch ) && noWordSep.indexOf( ch ) == -1 ) )
      {
        wordStart = i + 1;
        break;
      }
    }

    return wordStart;
  }


}

   
    
    
    
  

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