Creating a PHP/HTML Editor

Question

I'm doing a school project on a PHP/HTML Editor.
I'm looking for some help on finding a good tutorial on changing properties to a JEditorPane. I want to set up the indent size, colors for tags, comments, statements, etc...
anyone help??

Answer 1

Here, I stole this code from the advanced forum on Saturday and tried to develop it, though gave up when I couldn't get setTabs or load file to work and tooltips was too damn slow.
I had an idea that I could use it to run javac and to execute Frames and Applets with it ... right now I'm reconfiguring the design and thinking about dropping the highlighter altogether, but thats my story. Still it may be useful /may give you ideas /may be just the base or platform you're looking for.import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.text.*;
import java.io.*;
class Highlighter extends DefaultStyledDocument{
     private DefaultStyledDocument doc;
     private Element rootElement;
     private boolean multiLineComment;
     private MutableAttributeSet normal;
     private MutableAttributeSet keyword;
     private MutableAttributeSet comment;
     private MutableAttributeSet quote;
     private MutableAttributeSet tabSpace;
     private Hashtable keywords;
public Highlighter(){
       doc = this;
     rootElement = doc.getDefaultRootElement();
     putProperty(DefaultEditorKit.EndOfLineStringProperty, "\n" );
     normal = new SimpleAttributeSet();
     StyleConstants.setForeground(normal, Color.black);
     comment = new SimpleAttributeSet();
     StyleConstants.setForeground(comment, Color.green);
     StyleConstants.setItalic(comment, true);
     keyword = new SimpleAttributeSet();
     StyleConstants.setForeground(keyword, Color.blue);
     quote = new SimpleAttributeSet();
     StyleConstants.setForeground(quote, Color.red);
     Object dummyObject = new Object();
     keywords = new Hashtable();
     keywords.put( "abstract", dummyObject );
     keywords.put( "boolean", dummyObject );
     keywords.put( "break", dummyObject );
     keywords.put( "byte", dummyObject );
     keywords.put( "byvalue", dummyObject );
     keywords.put( "case", dummyObject );
     keywords.put( "cast", dummyObject );
     keywords.put( "catch", dummyObject );
     keywords.put( "char", dummyObject );
     keywords.put( "class", dummyObject );
     keywords.put( "continue", dummyObject );
     keywords.put( "default", dummyObject );
     keywords.put( "do", dummyObject );
     keywords.put( "double", dummyObject );
     keywords.put( "else", dummyObject );
     keywords.put( "extends", dummyObject );
     keywords.put( "false", dummyObject );
     keywords.put( "final", dummyObject );
     keywords.put( "finally", dummyObject );
     keywords.put( "float", dummyObject );
     keywords.put( "for", dummyObject );
     keywords.put( "if", dummyObject );
     keywords.put( "implements", dummyObject );
     keywords.put( "import", dummyObject );
     keywords.put( "instanceof", dummyObject );
     keywords.put( "int", dummyObject );
     keywords.put( "interface", dummyObject );
     keywords.put( "long", dummyObject );
     keywords.put( "new", dummyObject );
     keywords.put( "null", dummyObject );
     keywords.put( "package", dummyObject );
     keywords.put( "private", dummyObject );
     keywords.put( "protected", dummyObject );
     keywords.put( "public", dummyObject );
     keywords.put( "return", dummyObject );
     keywords.put( "short", dummyObject );
     keywords.put( "static", dummyObject );
     keywords.put( "super", dummyObject );
     keywords.put( "switch", dummyObject );
     keywords.put( "synchronized", dummyObject );
     keywords.put( "this", dummyObject );
     keywords.put( "throw", dummyObject );
     keywords.put( "throws", dummyObject );
     keywords.put( "transient", dummyObject );
     keywords.put( "true", dummyObject );
     keywords.put( "try", dummyObject );
     keywords.put( "void", dummyObject );
     keywords.put( "volatile", dummyObject );
     keywords.put( "while", dummyObject );
* Override to apply syntax highlighting after the document has been updated
   public void insertString(int offset, String str, AttributeSet a)
                                        throws BadLocationException{
          if (str.equals("{"))
          str = addMatchingBrace(offset);
          super.insertString(offset, str, a);
          processChangedLines(offset, str.length());
* Override to apply syntax highlighting after the document has been updated
   public void remove(int offset, int length) throws BadLocationException{
          super.remove(offset, length);
          processChangedLines(offset, 0);
* Determine how many lines have been changed,
* then apply highlighting to each line
   private void processChangedLines(int offset, int length)
                                throws BadLocationException {
          String content = doc.getText(0, doc.getLength());
          // The lines affected by the latest document update
          int startLine = rootElement.getElementIndex( offset );
          int endLine = rootElement.getElementIndex( offset + length );
          // Make sure all comment lines prior to the start line are commented
          // and determine if the start line is still in a multi line comment
          setMultiLineComment( commentLinesBefore( content, startLine ) );
          // Do the actual highlighting
               for (int i = startLine; i <= endLine; i++){
                    applyHighlighting(content, i);
      // Resolve highlighting to the next end multi line delimiter
          if (isMultiLineComment())commentLinesAfter(content, endLine);
          else highlightLinesAfter(content, endLine);
* Highlight lines when a multi line comment is still 'open'
* (ie. matching end delimiter has not yet been encountered)
     private boolean commentLinesBefore(String content, int line){
          int offset = rootElement.getElement( line ).getStartOffset();
          // Start of comment not found, nothing to do
          int startDelimiter = lastIndexOf( content, getStartDelimiter(), offset-2);
          if (startDelimiter < 0)return false;
          // Matching start/end of comment found, nothing to do
          int endDelimiter = indexOf( content, getEndDelimiter(), startDelimiter );
          if (endDelimiter < offset & endDelimiter != -1)return false;
          // End of comment not found, highlight the lines
          doc.setCharacterAttributes(startDelimiter, offset - startDelimiter + 1, comment, false);
          return true;
* Highlight comment lines to matching end delimiter
     private void commentLinesAfter(String content, int line){
          int offset = rootElement.getElement( line ).getEndOffset();
          // End of comment not found, nothing to do
          int endDelimiter = indexOf( content, getEndDelimiter(), offset );
          if (endDelimiter < 0) return;
          // Matching start/end of comment found, comment the lines
          int startDelimiter = lastIndexOf( content, getStartDelimiter(), endDelimiter );
               if (startDelimiter < 0 || startDelimiter <= offset){
                    doc.setCharacterAttributes(offset, endDelimiter - offset + 1, comment, false);
* Highlight lines to start or end delimiter
     private void highlightLinesAfter(String content, int line)
                                                            throws BadLocationException{
          int offset = rootElement.getElement( line ).getEndOffset();
          // Start/End delimiter not found, nothing to do
          int startDelimiter = indexOf( content, getStartDelimiter(), offset );
          int endDelimiter = indexOf( content, getEndDelimiter(), offset );
          if (startDelimiter < 0)     startDelimiter = content.length();
          if (endDelimiter < 0)endDelimiter = content.length();
          int delimiter = Math.min(startDelimiter, endDelimiter);
          if (delimiter < offset)return;
          // Start/End delimiter found, reapply highlighting
          int endLine = rootElement.getElementIndex( delimiter );
               for (int i = line + 1; i < endLine; i++){
                    Element branch = rootElement.getElement( i );
                    Element leaf = doc.getCharacterElement( branch.getStartOffset() );
                    AttributeSet as = leaf.getAttributes();
                    if ( as.isEqual(comment) )applyHighlighting(content, i);
* Parse the line to determine the appropriate highlighting
     private void applyHighlighting(String content, int line)
                                                         throws BadLocationException{
          int startOffset = rootElement.getElement( line ).getStartOffset();
          int endOffset = rootElement.getElement( line ).getEndOffset() - 1;
          int lineLength = endOffset - startOffset;
          int contentLength = content.length();
               if (endOffset >= contentLength)endOffset = contentLength - 1;
          // check for multi line comments
          // (always set the comment attribute for the entire line)
             if (endingMultiLineComment(content, startOffset, endOffset)
            ||isMultiLineComment()||startingMultiLineComment(content, startOffset, endOffset)){
                     doc.setCharacterAttributes(startOffset, endOffset - startOffset + 1, comment, false);
                     return;
          // set normal attributes for the line
          doc.setCharacterAttributes(startOffset, lineLength, normal, true);
          // check for single line comment
          int index = content.indexOf(getSingleLineDelimiter(), startOffset);
               if ( (index > -1) && (index < endOffset) ){
                    doc.setCharacterAttributes(index, endOffset - index + 1, comment, false);
                    endOffset = index - 1;
          // check for tokens
          checkForTokens(content, startOffset, endOffset);
* Does this line contain the start delimiter
     private boolean startingMultiLineComment(String content, int startOffset, int endOffset)
                                                                                                          throws BadLocationException{
          int index = indexOf( content, getStartDelimiter(), startOffset );
               if ( (index < 0) || (index > endOffset) )return false;
               else{
                    setMultiLineComment( true );
                    return true;
* Does this line contain the end delimiter
     private boolean endingMultiLineComment(String content, int startOffset, int endOffset)
                                                                                                         throws BadLocationException{
          int index = indexOf( content, getEndDelimiter(), startOffset );
               if ( (index < 0) || (index > endOffset) )return false;
               else{
                    setMultiLineComment( false );
                    return true;
* We have found a start delimiter
* and are still searching for the end delimiter
     private boolean isMultiLineComment(){
          return multiLineComment;
     private void setMultiLineComment(boolean value){
          multiLineComment = value;
* Parse the line for tokens to highlight
     private void checkForTokens(String content, int startOffset, int endOffset){
          while (startOffset <= endOffset){
          // skip the delimiters to find the start of a new token
               while (isDelimiter(content.substring(startOffset, startOffset+1))){
                    if (startOffset < endOffset)startOffset++;
                    else return;
          // Extract and process the entire token
          if (isQuoteDelimiter( content.substring(startOffset, startOffset + 1)))
               startOffset = getQuoteToken(content, startOffset, endOffset);
          else startOffset = getOtherToken(content, startOffset, endOffset);
     private int getQuoteToken(String content, int startOffset, int endOffset){
          String quoteDelimiter = content.substring(startOffset, startOffset + 1);
          String escapeString = getEscapeString(quoteDelimiter);
          int index;
          int endOfQuote = startOffset;
          // skip over the escape quotes in this quote
          index = content.indexOf(escapeString, endOfQuote + 1);
               while ( (index > -1) && (index < endOffset) ){
                    endOfQuote = index + 1;
                    index = content.indexOf(escapeString, endOfQuote);
          // now find the matching delimiter
          index = content.indexOf(quoteDelimiter, endOfQuote + 1);
               if ( (index < 0) || (index > endOffset) )endOfQuote = endOffset;
               else endOfQuote = index;
          doc.setCharacterAttributes(startOffset, endOfQuote-startOffset+1, quote, false);
     return endOfQuote + 1;
     private int getOtherToken(String content, int startOffset, int endOffset){
          int endOfToken = startOffset + 1;
          while (endOfToken <= endOffset ){
               if (isDelimiter(content.substring(endOfToken, endOfToken+1)))break;
               endOfToken++;
          String token = content.substring(startOffset, endOfToken);
               if ( isKeyword( token ) )
                    doc.setCharacterAttributes(startOffset, endOfToken-startOffset, keyword, false);
          return endOfToken + 1;
* Assume the needle will the found at the start/end of the line
     private int indexOf(String content, String needle, int offset){
          int index;
               while ( (index = content.indexOf(needle, offset)) != -1 ){
                    String text = getLine( content, index ).trim();
                         if (text.startsWith(needle) || text.endsWith(needle))break;
                         else offset = index + 1;
          return index;
* Assume the needle will the found at the start/end of the line
     private int lastIndexOf(String content, String needle, int offset){
          int index;
          while ( (index = content.lastIndexOf(needle, offset)) != -1 ){
               String text = getLine( content, index ).trim();
                    if (text.startsWith(needle) || text.endsWith(needle))break;
                    else offset = index - 1;
          return index;
     private String getLine(String content, int offset){
          int line = rootElement.getElementIndex( offset );
          Element lineElement = rootElement.getElement( line );
          int start = lineElement.getStartOffset();
          int end = lineElement.getEndOffset();
          return content.substring(start, end - 1);
* Override for other languages
     protected boolean isDelimiter(String character){
          String operands = ";:{}()[]+-/%<=>!&|^~*";
               if (Character.isWhitespace( character.charAt(0) ) ||
                                        operands.indexOf(character)!= -1 ) return true;
               else return false;
* Override for other languages
     protected boolean isQuoteDelimiter(String character){
          String quoteDelimiters = "\"'";
               if (quoteDelimiters.indexOf(character) < 0) return false;
               else return true;
* Override for other languages
     protected boolean isKeyword(String token){
          Object o = keywords.get( token );
          return o == null ? false : true;
* Override for other languages
     protected String getStartDelimiter(){
          return "/*";
* Override for other languages
     protected String getEndDelimiter(){
          return "*/";
* Override for other languages
     protected String getSingleLineDelimiter(){
          return "//";
* Override for other languages
     protected String getEscapeString(String quoteDelimiter){
          return "\\" + quoteDelimiter;
     protected String addMatchingBrace(int offset) throws BadLocationException{
          StringBuffer whiteSpace = new StringBuffer();
          int line = rootElement.getElementIndex( offset );
          int i = rootElement.getElement(line).getStartOffset();
               while (true){
                    String temp = doc.getText(i, 1);
                         if (temp.equals(" ") || temp.equals("\t")){
                              whiteSpace.append(temp);
                            i++;
                         else break;
          return "{\n" + whiteSpace.toString() + "\t\n" + whiteSpace.toString() + "}";
public class MyJavac extends JFrame implements ActionListener{
   JPanel top, main;
     JEditorPane edit = new JEditorPane();
   Highlighter syntax = new Highlighter();
   JButton []buts = new JButton[7];
   String theText="";
public MyJavac(){
   super("Java Based Text Editor");
   getContentPane().setLayout(new BorderLayout() );
   String []str = {"New","Open","Save","Save As","Compile","J/Frame","Applet"};
   String []tooltips = {"<html><center>Open a new <br>java file</center></html>",
                        "<html><center>Open an existing<br>java file</center></html>",
                        "<html><center>Save java<br>file</center></html>",
                        "<html><center>Save java file<br>with new filename</center></html>",
                        "<html><center>Run the javac<br>DOS compiler</center></html>",
                        "<html><center>Run java JFrame<br>or Frame application</center></html>",
                        "<html><center>Run java Applet<br>html application</center></html>"};
   top = new JPanel();
   top.setLayout(new GridLayout(1,7,5,0) );
   JPanel east = new JPanel();
   JPanel west = new JPanel();
      for(int i=0; i<buts.length; i++){
         buts[i] = new JButton(str);
buts[i].setToolTipText(tooltips[i]);
buts[i].addActionListener(this);
top.add(buts[i]);
main = new JPanel();
main.setLayout(new GridLayout(1,1) );
     edit.setEditorKit(new StyledEditorKit());
     edit.setDocument(syntax);
     JScrollPane scroll=new JScrollPane(edit);
main.add(scroll);
getContentPane().add("North",top);
getContentPane().add("Center",main);
public void actionPerformed(ActionEvent e){
String option = e.getActionCommand();
if(option.equals("New")){}
if(option.equals("Open")) {
JFileChooser chooser = new JFileChooser();
int returnVal = chooser.showOpenDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION);
try {
getFromFile();
catch(Exception f){
String error1= "Error opening the file ";
String error2 = "or the file was not found";
JOptionPane.showMessageDialog(null, error1 +"\n" + error2);
edit.setText(theText);
public void getFromFile() throws Exception{
int reader = 0;
theText = "";
FileReader in = new FileReader("junk.txt");
do {
reader = in.read();
theText += (char)reader;
} while (reader != -1);
in.close();
public static void main(String args[]){
MyJavac jav = new MyJavac();
     Image onFrame = Toolkit.getDefaultToolkit().getImage("flag.gif") ;
jav.setIconImage(onFrame);
     jav.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
     jav.setSize(600,400);
     jav.setVisible(true);