404 lines
10 KiB
Java
404 lines
10 KiB
Java
//This file is part of SECONDO.
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//Copyright (C) 2004, University in Hagen, Department of Computer Science,
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//Database Systems for New Applications.
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//SECONDO is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//SECONDO is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//You should have received a copy of the GNU General Public License
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//along with SECONDO; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package viewer.hoese.algebras;
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import sj.lang.ListExpr;
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import viewer.*;
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import viewer.hoese.*;
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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import javax.swing.text.EditorKit;
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import javax.swing.text.Document;
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import tools.Base64Decoder;
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import tools.Reporter;
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import java.io.*;
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import java.util.*;
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import java.util.regex.*;
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/**
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* A displayclass for the html formatted code
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*/
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public class Dsplhtml extends DsplGeneric implements ExternDisplay{
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protected boolean defined;
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protected String content;
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protected Dsplurl.Url url;
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/** Creates a new Instance of this.
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*/
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public Dsplhtml(){
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if(Display==null){
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Display = new HTMLViewerFrame();
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}
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}
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public String toString(){
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return Entry;
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}
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protected String changeMetaTag(String orig){
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return ""; // we don't need meta tags for display
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// remove charsetinfo because of problems with this attribute
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//String attr = "(("+pattern_string +")|("+pattern_symbol+"))";
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//String cs = "[cC][hH][aA][rR][sS][eE][tT]\\s*=\\s*"+attr;
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//return orig.replaceAll(cs,"");
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}
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protected String changeImgTag(String orig){
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String attr = "(("+pattern_string +")|("+pattern_symbol+"))";
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String src = "[sS][Rr][cC]\\s*=\\s*"+attr;
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return orig.replaceAll(src,"src=\"dummy\"");
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}
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protected String changeLinkTag(String orig){
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String attr = "(("+pattern_string +")|("+pattern_symbol+"))";
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String src = "[hH][Rr][eE][fF]\\s*=\\s*"+attr;
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return orig.replaceAll(src,"src=\"dummy\"");
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}
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protected String changeTag(String orig){
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if(orig.matches("<[mM][eE][tT][Aa]\\s([^a]|[a])*")){
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String res = changeMetaTag(orig);
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return res;
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}
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if(orig.matches("<[iI][mM][gG]\\s([^a]|[a])*")){
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return changeImgTag(orig);
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}
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if(orig.matches("<[lL][iI][nN][kK]\\s([^a]|[a])*")){
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return changeLinkTag(orig);
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}
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// insert further known tags to change
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return orig;
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}
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protected String changeTags(String content){
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StringBuffer result = new StringBuffer();
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int lastPos = 0;
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String pattern_tag = "<[a-zA-Z!]*\\s((\\s|[^>])|("+pattern_string+"))*>";
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Pattern p = Pattern.compile(pattern_tag);
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Matcher m = p.matcher(content);
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while(m.find()){
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String rest = content.substring(lastPos,m.start());
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result.append(rest);
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String orig = m.group();
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String changedTag = changeTag(orig);
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result.append(changedTag);
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lastPos = m.end();
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}
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String rest = content.substring(lastPos,content.length());
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result.append(rest);
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String res = result.toString();
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return res;
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}
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protected boolean scanValue(ListExpr value){
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if(value.listLength()==2 && value.first().atomType()==ListExpr.SYMBOL_ATOM &&
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value.first().symbolValue().equals("html")){
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value = value.second();
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}
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if(value.listLength()!=3){
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Reporter.debug("wrong listlength for html "+value.listLength());
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return false;
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}
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Double Time = LEUtils.readInstant(value.first());
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if(Time==null){
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Reporter.debug("instant not readable");
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return false;
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}
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this.url= new Dsplurl.Url();
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url.readFrom(value.third());
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if(value.second().atomType()!=ListExpr.TEXT_ATOM){
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Reporter.debug("not an text atom");
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return false;
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}
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String contentb64 = value.second().textValue();
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content=null;
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try{
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content = new String(Base64Decoder.decode(contentb64));
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} catch(Exception e){
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Reporter.debug("could not decode Base64 text atom");
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Reporter.debug(contentb64);
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return false;
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}
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content = changeTags(content);
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return true;
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}
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public void init (String name, int nameWidth, int indent,
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ListExpr type, ListExpr value, QueryResult qr)
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{
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String T = name;
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String V;
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if (value.listLength()==1){
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value = value.first();
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}
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defined = !isUndefined(value);
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if(!defined){
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V = "undefined";
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content="undefined";
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}else{
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V = "HTML";
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scanValue(value);
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}
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T=extendString(T,nameWidth, indent);
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String Text = V;
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Entry = T + " : <html> ...";
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qr.addEntry(this);
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return;
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}
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public void displayExtern(){
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Display.setSource(this);
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Display.setVisible(true);
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}
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public boolean isExternDisplayed(){
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return Display.isVisible() && this.equals(Display.getSource());
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}
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private static boolean isWhiteSpace(char c){
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return WHITESPACES.indexOf(c)>=0;
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}
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private static HTMLViewerFrame Display=null;
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private String Entry;
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private int Type; // contains the type which is the text (probably)
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private static final int MAX_DIRECT_DISPLAY_LENGTH = 30;
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private static final String WHITESPACES = " \t\n\r";
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private static class HTMLViewerFrame extends JFrame{
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public HTMLViewerFrame(){
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getContentPane().setLayout(new BorderLayout());
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Display = new JEditorPane();
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Display.setContentType("text/html");
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TextScrollPane = new JScrollPane(Display);
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TextPanel = new JPanel(new BorderLayout());
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JPanel SearchPanel = new JPanel();
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SearchPanel.add(CaseSensitive);
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SearchPanel.add(SearchField);
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SearchPanel.add(SearchBtn);
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SearchBtn.addActionListener(new ActionListener(){
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public void actionPerformed(ActionEvent evt){
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searchText();
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}
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});
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SearchField.addKeyListener(new KeyListener(){
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public void keyPressed(KeyEvent evt){
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if(evt.getKeyCode()==KeyEvent.VK_ENTER)
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searchText();
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}
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public void keyTyped(KeyEvent evt){}
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public void keyReleased(KeyEvent evt){}
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});
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TextPanel.add(TextScrollPane,BorderLayout.CENTER);
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TextPanel.add(SearchPanel,BorderLayout.SOUTH);
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getContentPane().add(TextPanel,BorderLayout.CENTER);
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CloseBtn = new JButton("Close");
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CloseBtn.addActionListener(new ActionListener(){
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public void actionPerformed(ActionEvent evt){
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TheText=null;
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HTMLViewerFrame.this.setVisible(false);
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}
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} );
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fileChooser = new JFileChooser();
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SaveBtn = new JButton("Save");
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SaveBtn.addActionListener(new ActionListener(){
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public void actionPerformed(ActionEvent evt){
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if(fileChooser.showSaveDialog(HTMLViewerFrame.this)==JFileChooser.APPROVE_OPTION){
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File F = HTMLViewerFrame.this.fileChooser.getSelectedFile();
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try{
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BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(F));
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out.write(TheText.getBytes());
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out.flush();
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out.close();
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}catch(Exception e){
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Reporter.debug(e);
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Reporter.showError("Error in saving file ");
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}
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}
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}
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});
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FormatBtn.addActionListener(new ActionListener(){
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public void actionPerformed(ActionEvent evt){
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String s = ((JButton)evt.getSource()).getText();
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switchFormat(!s.equals(TXT_SOURCE));
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}
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});
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JPanel ControlPanel = new JPanel();
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ControlPanel.add(CloseBtn);
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ControlPanel.add(SaveBtn);
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ControlPanel.add(FormatBtn);
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getContentPane().add(ControlPanel,BorderLayout.SOUTH);
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setSize(640,480);
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}
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public void switchFormat(boolean toHTML){
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if(toHTML){
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try{
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FormatBtn.setText(TXT_SOURCE);
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Display.setContentType("text/html");
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Display.setText(TheText);
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Display.setCaretPosition(0);
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}catch(Exception e){
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Reporter.showError("Error in rendering html ");
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switchFormat(false);
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}
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} else {
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FormatBtn.setText(TXT_HTML);
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Display.setContentType("text/plain");
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Display.setText(TheText);
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Display.setCaretPosition(0);
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}
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}
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/** searchs the text in the textfield in the document and
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* marks its if found
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*/
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private void searchText(){
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String Text = SearchField.getText();
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if(Text.length()==0){
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Reporter.showError("no text to search");
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return;
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}
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try{
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Document Doc = Display.getDocument();
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String DocText = Doc.getText(0,Doc.getLength());
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if(!CaseSensitive.isSelected()){
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DocText = DocText.toUpperCase();
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Text = Text.toUpperCase();
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}
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int pos = DocText.indexOf(Text,LastSearchPos);
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if(pos<0){
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Reporter.showError("end of text is reached");
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LastSearchPos=0;
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return;
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}
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pos = pos;
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int i1 = pos;
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int i2 = pos+Text.length();
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LastSearchPos = pos+1;
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Display.setCaretPosition(i1);
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Display.moveCaretPosition(i2);
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Display.getCaret().setSelectionVisible(true);
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} catch(Exception e){
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Reporter.debug(e);
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Reporter.showError("error in searching text");
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}
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}
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public void setSource(Dsplhtml S){
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Source = S;
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LastSearchPos=0;
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Display.setEditable(false);
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TheText = S.content;
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try{
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Display.setText(TheText);
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} catch(Exception e){
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Reporter.debug("Error in setting text");
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Display.setText("");
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}
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Display.setCaretPosition(0);// go to top
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getContentPane().add(TextPanel,BorderLayout.CENTER);
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invalidate();validate();repaint();
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}
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public Dsplhtml getSource(){
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return Source;
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}
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private JEditorPane Display;
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private JButton CloseBtn;
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private JButton SaveBtn;
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private JFileChooser fileChooser;
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private Dsplhtml Source;
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private String TheText;
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private static JScrollPane TextScrollPane;
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private static JPanel TextPanel;
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private JCheckBox CaseSensitive = new JCheckBox("case sensitive");
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private JTextField SearchField = new JTextField(20);
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private JButton SearchBtn = new JButton("search");
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private static final String TXT_SOURCE = "source";
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private static final String TXT_HTML="html";
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private JButton FormatBtn = new JButton(TXT_SOURCE);
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private int LastSearchPos=0;
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}
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public static final String pattern_string = "(\"((\\\\\")|([^\"]))*\")|('((\\\\')|([^']))*')";
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public static final String pattern_symbol = "[^\\s\"]+";
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}
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