import java.io.*;

import java.awt.*;

import java.awt.event.*;

import java.util.StringTokenizer;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

class Editor extends WindowAdapter implements ActionListener,TextListener

{

Frame f;

MenuBar mb;

Menu m1,m2;

MenuItem nw,opn,sve,svea,ext,fnd,fndrep;

TextArea txt;

SavePrompt sp;

Find findbox;

FindReplace findreplacebox;

NoMatch nomatchfound;

String file_path; // stores path of current file

String file_content; //stores content of textarea

String default_path; // stores path of untitled file

boolean isCancel = true; // In save prompt,if cancelled is clicked then true.

boolean firstrun = true;

Matcher m;

Pattern p;

public Editor()

{

f = new Frame();

f.setSize(800,700);

mb = new MenuBar();

m1 = new Menu("File");

m2 = new Menu("Edit");

nw = new MenuItem("New");

opn = new MenuItem("Open");

sve = new MenuItem("Save");

svea = new MenuItem("Save As");

ext = new MenuItem("Exit");

fnd = new MenuItem("Find");

fndrep = new MenuItem("Find and Replace");

nw.addActionListener(this);

opn.addActionListener(this);

sve.addActionListener(this);

ext.addActionListener(this);

svea.addActionListener(this);

fnd.addActionListener(this);

fndrep.addActionListener(this);

txt = new TextArea();

txt.addTextListener(this);

m1.add(nw);

m1.add(opn);

m1.add(sve);

m1.add(svea);

m1.add(ext);

m2.add(fnd);

m2.add(fndrep);

mb.add(m1);

mb.add(m2);

f.add(txt);

f.addWindowListener(this);

f.setMenuBar(mb);

try

{

File file = new File("temp");

String str;

if(!file.isDirectory())

file.mkdir();

str=file.getAbsolutePath();

str=str+"\\untitled.txt";

f.setTitle("untitled.txt");

FileOutputStream fos = new FileOutputStream(str); //File named "untitled" is created

file_path = str;

default_path = str;

file_content="";

}

catch(Exception e1)

{

System.out.print("Exception in creating default file \t"+e1.getMessage());

}

sp = new SavePrompt();

findbox = new Find();

findreplacebox = new FindReplace();

nomatchfound = new NoMatch();

fnd.setEnabled(false);

fndrep.setEnabled(false);

f.setVisible(true);

}

public void windowClosing(WindowEvent e)

{

fexit2();

}

public void actionPerformed(ActionEvent e)

{

Object ae=e.getSource();

if(ae==nw)

{

System.out.println("New is clicked");

fnew2();

}

if(ae==opn)

{

System.out.println("Open is clicked");

fopen2();

}

if(ae==sve)

{

System.out.println("Save is clicked");

fsave();

}

if(ae==svea)

{

System.out.println("Save As is clicked");

fsaveas();

}

if(ae==ext)

{

System.out.println("Exit is clicked");

fexit2();

}

if(ae==fnd)

{

System.out.println("Find is clicked");

findbox.show();

}

if(ae==fndrep)

{

System.out.println("Find and Replace is clicked");

findreplacebox.show();

}

}

public void fexit2()

{

if(isSaved())

fexit();

else

{

sp.openAskSaveDialog();

if(!isCancel)

fexit();

}

}

public void fexit()

{

f.setVisible(false);

f.dispose();

System.exit(1);

}

public void fopen2()

{

if(isSaved())

{

fopen();

}

else

{

sp.openAskSaveDialog();

if(!isCancel)

fopen();

}

}

public void fnew2()

{

if(isSaved())

{

fnew();

}

else

{

sp.openAskSaveDialog();

if(!isCancel)

fnew();

}

}

public void fopen()

{

//1. Check if file is saved or not

FileDialog fd = new FileDialog(f,"Open file",FileDialog.LOAD);

fd.setVisible(true);

String file_name = fd.getFile();

String dir_name = fd.getDirectory();

//System.out.println("File location:\n"+dir_name+"\\"+file_name);

File opened_file = new File(dir_name+"\\"+file_name);

System.out.println(opened_file.getAbsolutePath());

if(file_name!=null)

{

try

{

FileInputStream fis = new FileInputStream(opened_file);

int ch;

String stropen="";

while((ch=fis.read())!=-1)

{

stropen = stropen + (char)ch;

}

//System.out.println(stropen);

txt.setText(stropen);

f.setTitle(file_name);

file_path = opened_file.getAbsolutePath();

file_content = stropen;

}

catch(Exception e1)

{

System.out.print("Exception at fopen \t"+e1.getMessage());

}

}

else

{

System.out.println("Cancel was clicked");

}

}

public void fsaveas()

{

FileDialog fd = new FileDialog(f,"Save file",FileDialog.SAVE);

fd.setVisible(true);

String file_name = fd.getFile();

String dir_name = fd.getDirectory();

//System.out.println("File location:\n"+dir_name+"\\"+file_name);

File opened_file = new File(dir_name+"\\"+file_name);

System.out.println(opened_file.getAbsolutePath());

System.out.println("File_name = "+file_name);

if(file_name!=null)

{

try

{

FileOutputStream fos = new FileOutputStream(opened_file);

String write = txt.getText();

int ch;

for(int i=0;i<write.length();i++)

{

ch = (int)write.charAt(i);

fos.write(ch);

}

f.setTitle(file_name);

file_path = opened_file.getAbsolutePath();

file_content = write;

}

catch(Exception e1)

{

System.out.print("Exception at fsaveas \t"+e1.getMessage());

}

}

else

{

System.out.println("Cancel is clicked");

isCancel=true;

}

}

public void fsave()

{

if(file_path.equals(default_path))

{

System.out.println("run fsaveas");

fsaveas();

}

else

{

System.out.println("Run save");

//save code

try

{

FileOutputStream fos = new FileOutputStream(file_path);

String write = txt.getText();

int ch;

for(int i=0;i<write.length();i++)

{

ch = (int)write.charAt(i);

fos.write(ch);

}

file_content = write;

}

catch(Exception e1)

{

System.out.print("Exception at fsave \t"+e1.getMessage());

e1.printStackTrace();

}

}

}

public void fnew()

{

try

{

File file = new File("temp");

String str;

if(!file.isDirectory())

file.mkdir();

str=file.getAbsolutePath();

str=str+"\\untitled.txt";

f.setTitle("untitled.txt");

txt.setText("");

FileOutputStream fos = new FileOutputStream(str); //File named "untitled" is created

file_path = str;

default_path = str;

file_content="";

}

catch(Exception e1)

{

System.out.print("Exception in fnew \t"+e1.getMessage());

}

}

public boolean isSaved() // checks if the currently opened file is saved or not. - returns true if file is saved.

{

String currenttext = txt.getText();

//System.out.println("Current Text = \n"+currenttext + "\nfile_content=\n" + file_content);

if(currenttext.equals(file_content))

return true;

else

return false;

}

class SavePrompt extends WindowAdapter implements ActionListener

{

Dialog d;

Button b1,b2,b3;

Label l;

Panel p1;

public SavePrompt()

{

d = new Dialog(f,"Want to save?",Dialog.ModalityType.APPLICATION_MODAL);

d.setSize(200,100);

b1 = new Button("Yes");

b2 = new Button("No");

b3 = new Button("Cancel");

Label l = new Label("Do you want to save?");

Panel p1 = new Panel();

p1.add(b1);

p1.add(b2);

p1.add(b3);

d.add(l);

d.add(p1,"South");

d.addWindowListener(this);

b1.addActionListener(this);

b2.addActionListener(this);

b3.addActionListener(this);

}

public void windowClosing(WindowEvent e)

{

d.setVisible(false);

isCancel = true;

}

public void openAskSaveDialog()

{

d.setVisible(true);

}

public void actionPerformed(ActionEvent ae)

{

Object o = ae.getSource();

if(o==b1)

{

System.out.println("Yes is clicked");

isCancel = false;

fsave();

d.setVisible(false);

}

if(o==b2)

{

System.out.println("No is clicked");

isCancel = false;

d.setVisible(false);

}

if(o==b3)

{

System.out.println("Cancel is clicked");

isCancel = true;

d.setVisible(false);

}

}

}

class Find extends WindowAdapter implements ActionListener,TextListener

{

Dialog find;

Label find_label;

TextField find_tf;

Button find_b1,find_b2;

Panel find_p1;

String currenttxt;

int currentposition;

String currentfind;

int nc;

boolean isFind=true;

public Find()

{

find = new Dialog(f,false);

find.setSize(200,120);

find_label = new Label("Find :");

find_tf = new TextField();

find_b1 = new Button("Find Next");

find_b2 = new Button("Close");

find_b1.setEnabled(false);

find.setTitle("Find :");

find_p1 = new Panel(new FlowLayout());

find_p1.add(find_b1);

find_p1.add(find_b2);

find.add(find_label,"North");

find.add(find_tf,"Center");

find.add(find_p1,"South");

//find.setAlwaysOnTop(true);

/*Adding actionlistener,windowlisterner to all the button in Find*/

find_b1.addActionListener(this);

find_b2.addActionListener(this);

find.addWindowListener(this);

find_tf.addTextListener(this);

}

public void windowClosing(WindowEvent e)

{

find.setVisible(false);

find_tf.setText("");

firstrun = true;

}

public void textValueChanged(TextEvent e)

{

if(find_tf.getText().length()==0)

{

find_b1.setEnabled(false);

}

else

find_b1.setEnabled(true);

}

public void show()

{

find.setVisible(true);

findreplacebox.hide();

firstrun = true;

}

public void actionPerformed(ActionEvent ae)

{

Object o = ae.getSource();

if(o==find_b1)

{

System.out.println("Find Next is clicked");

findit();

}

if(o==find_b2)

{

System.out.println("Close is clicked");

find.setVisible(false);

find_tf.setText("");

firstrun=true;

}

}

public void findit()

{

String newtxt = txt.getText();

String newfindtxt = find_tf.getText();

int newpos = txt.getCaretPosition();

if(firstrun || (newpos!=currentposition) || !(newtxt.equals(currenttxt)) || !(newfindtxt.equals(currentfind)))

{

System.out.println("Inside firstrun");

currenttxt = txt.getText();

currentposition = txt.getCaretPosition();

currentfind = find_tf.getText();

p = Pattern.compile(Pattern.quote(find_tf.getText()));

m = p.matcher(currenttxt);

if(txt.getSelectedText().length()>0)

currentposition = txt.getSelectionEnd();

if(m.find(currentposition))

{

m.find(currentposition);

count_new_line(m.start());

txt.select(m.start()-nc,m.end()-nc);

isFind = true;

currentposition = txt.getCaretPosition();

}

else

{

System.out.println("No match found");

nomatchfound.show();

isFind = false;

}

firstrun = false;

}

else

{

if(m.find())

{

count_new_line(m.start());

txt.select(m.start()-nc,m.end()-nc);

isFind = true;

}

else

{

System.out.print("No match found");

nomatchfound.show();

isFind = false;

}

}

f.toFront();

currentposition = txt.getCaretPosition();

}

public void count_new_line(int n)

{

nc=0;

String str = txt.getText();

int ch;

for(int i=0;i<=n;i++)

{

ch = str.charAt(i);

if(ch==10)

{

nc++;

//System.out.println(nc);

}

}

}

public void hide()

{

find.setVisible(false);

}

}

class FindReplace extends Find implements ActionListener,TextListener

{

Dialog find_replace;

Label fr_label1,fr_label2;

TextField fr_tf1,fr_tf2;

Panel fr_p1,fr_p2;

Button fr_b1,fr_b2,fr_b3,fr_b4;

public FindReplace()

{

find_replace = new Dialog(f,false);

find_replace.setSize(400,200);

fr_label1 = new Label("Find Next");

fr_label2 = new Label("Replace With");

fr_tf1 = new TextField();

fr_tf2 = new TextField();

fr_p1 = new Panel(new GridLayout(4,1));

fr_p2 = new Panel(new FlowLayout());

fr_b1 = new Button("Find Next");

fr_b2 = new Button("Replace");

fr_b3 = new Button("Replace All");

fr_b4 = new Button("Close");

fr_p1.add(fr_label1);

fr_p1.add(fr_tf1);

fr_p1.add(fr_label2);

fr_p1.add(fr_tf2);

fr_p2.add(fr_b1);

fr_p2.add(fr_b2);

fr_p2.add(fr_b3);

fr_p2.add(fr_b4);

find_replace.add(fr_p1,"Center");

find_replace.add(fr_p2,"South");

fr_b1.setEnabled(false);

fr_b2.setEnabled(false);

fr_b3.setEnabled(false);

/*Adding actionlistener to all the button in Find and Replace*/

fr_b1.addActionListener(this);

fr_b2.addActionListener(this);

fr_b3.addActionListener(this);

fr_b4.addActionListener(this);

find_replace.addWindowListener(this);

fr_tf1.addTextListener(this);

/*Find textfield and find dialog now refers to findreplace textfield and findreplace dialog so that findit() runs smoothly in this. */

find_tf = fr_tf1;

find = find_replace;

}

public void show()

{

find_replace.setVisible(true);

findbox.hide();

firstrun = true;

}

public void hide()

{

find_replace.setVisible(false);

}

public void actionPerformed(ActionEvent e)

{

Object o = e.getSource();

if(o==fr_b1)

{

System.out.println("Find Next is clicked");

findit();

}

if(o==fr_b2)

{

System.out.println("Replace is clicked");

fReplace();

}

if(o==fr_b3)

{

System.out.println("Replace All is clicked");

fReplaceAll();

}

if(o==fr_b4)

{

System.out.println("Close is clicked");

find_replace.setVisible(false);

fr_tf1.setText("");

firstrun = true;

}

}

public void fReplace()

{

if(!firstrun)

{

if(isFind)

{

String replacetext = fr_tf2.getText();

int x = txt.getSelectionStart()-nc;

int y = txt.getSelectionEnd()-nc;

txt.replaceRange(replacetext,x,y);

}

}

findit();

}

public void fReplaceAll()

{

findit();

if(isFind)

{

String nice = m.replaceAll(fr_tf2.getText());

txt.setText(nice);

}

}

public void textValueChanged(TextEvent e)

{

if(fr_tf1.getText().length()==0)

{

fr_b1.setEnabled(false);

fr_b2.setEnabled(false);

fr_b3.setEnabled(false);

}

else

{

fr_b1.setEnabled(true);

fr_b2.setEnabled(true);

fr_b3.setEnabled(true);

}

}

public void windowClosing(WindowEvent e)

{

find_replace.setVisible(false);

fr_tf1.setText("");

firstrun = true;

}

}

public void textValueChanged(TextEvent e)

{

if(txt.getText().length()>0)

{

fnd.setEnabled(true);

fndrep.setEnabled(true);

}

else

{

fnd.setEnabled(false);

fndrep.setEnabled(false);

}

}

public static void main(String args[])

{

Editor edit = new Editor();

}

class NoMatch extends WindowAdapter implements ActionListener

{

Dialog d;

Label l;

Button b;

public NoMatch()

{

d = new Dialog(f,true);

d.setSize(100,100);

l = new Label("No Match Found");

b = new Button("OK");

d.add(l);

d.add(b,"South");

b.addActionListener(this);

d.addWindowListener(this);

d.setLocation(new Point(200,200));

}

public void show()

{

d.setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

Object o = e.getSource();

if(o==b)

{

d.setVisible(false);

}

}

public void windowClosing(WindowEvent e)

{

d.setVisible(false);

}

}

}