alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

What this is

This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Other links

The source code

/*
 * 03/27/2002 - 22:12:53
 *
 * TagsCompletion.java - Completes tags
 * Copyright (C) 2001 Romain Guy
 * romain.guy@jext.org
 * www.jext.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

import java.awt.event.*;

import java.util.ArrayList;
import java.util.Vector;

import javax.swing.SwingUtilities;
import javax.swing.text.Document;
import javax.swing.text.Element;

import org.gjt.sp.jedit.textarea.*;

import org.jext.*;
import org.jext.event.*;

public class TagsCompletion extends KeyAdapter implements JextListener
{
  private CompleteTagList popup;
  private ArrayList registeredAreas = new ArrayList();

  public static Vector tagsList, entitiesList;
  public static final String delimiters = " \t>;.,\"\'(){}[]";
  public static final String endDelimiters = "<&";

  public void unregisterTextArea(JextTextArea textArea)
  {
    if (registeredAreas.contains(textArea))
    {
      textArea.removeKeyListener(this);
      registeredAreas.remove(textArea);
    }
  }
        
  public void registerTextArea(JextTextArea textArea)
  {
    if (!registeredAreas.contains(textArea))
    {
      textArea.addKeyListener(this);
      registeredAreas.add(textArea);
    }
  }

  public void jextEventFired(JextEvent evt)
  {
    int what = evt.getWhat();
    JextTextArea textArea = evt.getTextArea();

    if (textArea == null)
      return;

    String mode = textArea.getColorizingMode();

    switch (what)
    {
      case JextEvent.TEXT_AREA_OPENED:
        if (mode.equals("html") || mode.equals("asp") || mode.equals("jsp") ||
            mode.equals("asp-vbscript") || mode.equals("php3"))
        {
          registerTextArea(textArea);
        }
        break;
      case JextEvent.SYNTAX_MODE_CHANGED:
        if (mode.equals("html") || mode.equals("asp") || mode.equals("jsp") ||
            mode.equals("asp-vbscript") || mode.equals("php3"))
        {
          registerTextArea(textArea);
        } else
          unregisterTextArea(textArea);
        break;
      case JextEvent.TEXT_AREA_CLOSED:
        unregisterTextArea(textArea);
        break;
    }
  }

  public void keyPressed(KeyEvent evt)
  {
    char c = evt.getKeyChar();
    if (c != '&' && c != '!' && (evt.getModifiers() != 0 || c == '>' || !Character.isLetterOrDigit(c)))
      return;

    final JextTextArea textArea = (JextTextArea) evt.getSource();
    SwingUtilities.invokeLater(new Runnable()
    {
      public void run()
      {
        showCompleteTagList(textArea);
      }
    });
  }

  private String getWord(JextTextArea textArea)
  {
    Document doc = textArea.getDocument();
    Element map = doc.getDefaultRootElement();
    Element lineElement = map.getElement(map.getElementIndex(textArea.getCaretPosition()));

    int start = lineElement.getStartOffset();
    int end = lineElement.getEndOffset() - 1;
    int length = end - start;
    int startPos = textArea.getCaretPosition();

    if (startPos == end)
    {
      if (startPos == start)
        return null;
      else
        startPos--;
    }

    String _line = textArea.getText(start, length);
    int linePos = startPos - start;

    int wordStart = -1;
    int wordEnd = -1;

    if (endDelimiters.indexOf(_line.charAt(linePos)) != -1 &&
        linePos - 1 >= 0 &&
        delimiters.indexOf(_line.charAt(linePos - 1)) != -1)
    {
      return null;
    }

    if (delimiters.indexOf(_line.charAt(linePos)) != -1)
    {
      if (linePos > 0)
      {
        if (delimiters.indexOf(_line.charAt(linePos - 1)) != -1)
          return null;
        else
          wordEnd = linePos;
      }

      for (int i = linePos - 1; i >= 0; i--)
      {
        if (delimiters.indexOf(_line.charAt(i)) != -1)
        {
          wordStart = i + 1;
          break;
        } else if (endDelimiters.indexOf(_line.charAt(i)) != -1) {
          wordStart = i;
          break;
        }
      }
    } else {
      if (endDelimiters.indexOf(_line.charAt(linePos)) != -1)
      {
        wordEnd = linePos;
        if (linePos > 0)
          linePos--;
      } else {
        for (int i = linePos; i < length; i++)
        {
          if (delimiters.indexOf(_line.charAt(i)) != -1)
          {
            wordEnd = i;
            break;
          }
        }
      }

      for (int i = linePos; i >= 0; i--)
      {
        if (delimiters.indexOf(_line.charAt(i)) != -1)
        {
          wordStart = i + 1;
          break;
        } else if (endDelimiters.indexOf(_line.charAt(i)) != -1) {
          wordStart = i;
          break;
        }
      }
    }

    if (wordStart == -1)
      wordStart = 0;

    if (wordEnd == -1)
      wordEnd = length;

    return _line.substring(wordStart, wordEnd);
  }

  private void showCompleteTagList(JextTextArea textArea)
  {
    String word = getWord(textArea);

    if (word != null)
    {
      if (word.startsWith("<"))
      {
        Tag[] list = buildTagsList(word.substring(1));
        if (list.length > 0)
          popup = new CompleteTagList(textArea.getJextParent(), this, word.substring(1), list);
      } else if (word.startsWith("&")) {
        Entity[] list = buildEntitiesList(word.substring(1));
        if (list.length > 0)
          popup = new CompleteTagList(textArea.getJextParent(), this, word.substring(1), list);
      }
    }
  }

  private void loadEntitiesList()
  {
    EntitiesListReader.read(TagsCompletion.class.getResourceAsStream("default-entities-list.xml"),
                                                                     "default-entities-list.xml");
  }

  private void loadTagsList()
  {
    TagsListReader.read(TagsCompletion.class.getResourceAsStream("default-tags-list.xml"),
                                                                 "default-tags-list.xml");
  }

  /* friendly */ Entity[] buildEntitiesList(String entity)
  {
    if (entitiesList == null)
      loadEntitiesList();

    Entity e;
    int len = entitiesList.size();
    Vector myTags = new Vector();

    for (int i = 0; i < len; i++)
    {
      e = (Entity) entitiesList.get(i);
      if (e.toString().startsWith(entity))
        myTags.add(e);
    }

    Entity[] list = new Entity[myTags.size()];
    for (int i = 0; i < list.length; i++)
      list[i] = (Entity) myTags.get(i);

    myTags.clear();
    myTags = null;

    return list;
  }

  /* friendly */ Tag[] buildTagsList(String tag)
  {
    if (tagsList == null)
      loadTagsList();

    boolean addEmptyTags = true;
    if (tag.startsWith("/"))
    {
      tag = tag.substring(1);
      addEmptyTags = false;
    }

    Tag e;
    int len = tagsList.size();
    Vector myTags = new Vector();

    for (int i = 0; i < len; i++)
    {
      e = (Tag) tagsList.get(i);

      if (e.isEmpty() && !addEmptyTags)
        continue;

      if (e.toString().startsWith(tag))
        myTags.add(e);
    }

    Tag[] list = new Tag[myTags.size()];
    for (int i = 0; i < list.length; i++)
      list[i] = (Tag) myTags.get(i);

    myTags.clear();
    myTags = null;

    return list;
  }
}

// End of TagsCompletion.java
... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.