TextUtilities.java Source code

Introduction

Here is the source code for TextUtilities.java

Source

/*
 * 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;
    }

}