import java.awt.Component; import java.awt.FlowLayout
import java.awt.Component; import java.awt.FlowLayout; import java.awt.GridLayout;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.*;
import java.lang.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculator {
private static Scanner scnr;
private static File inp_file;
private static String getLabel(String file_lines) {
int cntr;
file_lines.trim();
for (cntr = 0; cntr < file_lines.length(); cntr++) {
char tmp = file_lines.charAt(cntr);
boolean b2 = Character.isLetter(tmp);
if (!b2) {
break;
}
}
return file_lines.substring(0, cntr);
}
public static void main(String[] args) {
String strng, lbl;
try {
inp_file = new File(“Input.txt”);
scnr = new Scanner(inp_file);
if (scnr.hasNextLine()) {
strng = scnr.nextLine().trim();
lbl = getLabel(strng);
if (!lbl.equalsIgnoreCase(“Window”)) {
System.out.println(“First label should be WINDOW”);
return;
}
strng = strng.substring(lbl.length()).trim();
JFrame frame = (JFrame) addCompntRec(strng, lbl);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
} else {
System.out.println(“Unknown Error”);
}
} catch (FileNotFoundException exp) {
System.out.println(“File not found”);
exp.printStackTrace();
} catch (Exception excep) {
System.out.println(“Unknown Error”);
excep.printStackTrace();
}
}
private static ArrayList<Integer> getIntAray(String strng)
throws Exception {
int lp, lpj;
ArrayList<Integer> result = new ArrayList<Integer>();
for (lp = 0; lp < strng.length(); lp++) {
for (lpj = lp; lpj < strng.length() && Character.isDigit(strng.charAt(lpj)); lpj++)
;
if (lp != lpj) {
result.add(Integer.parseInt(strng.substring(lp, lpj)));
}
lp = lpj;
}
return result;
}
private static Component addCompntRec(String strng, String lbl)
throws Exception {
String tempr;
if (lbl.equalsIgnoreCase(“Window”)) {
strng = strng.trim();
JFrame frame;
if (strng.charAt(0) == ‘”‘) {
strng = strng.substring(1);
tempr = strng.substring(0, strng.indexOf(‘\”‘));
frame = new JFrame(tempr);
strng = strng.substring(strng.indexOf(‘”‘) + 1).trim();
} else {
frame = new JFrame(“Default title”);
}
if (strng.charAt(0) == ‘(‘) {
tempr = strng.substring(0, strng.indexOf(‘)’) + 1);
strng = strng.substring(tempr.length()).trim();
ArrayList<Integer> instr = getIntAray(tempr);
if (instr.size() == 2) {
frame.setSize(instr.get(0), instr.get(1));
}
}
tempr = getLabel(strng);
strng = strng.substring(tempr.length()).trim();
JPanel lpnl = new JPanel();
if (tempr.equalsIgnoreCase(“Layout”)) {
tempr = getLabel(strng);
strng = strng.substring(tempr.length()).trim();
if (tempr.equalsIgnoreCase(“flow”)) {
FlowLayout flw = new FlowLayout();
lpnl.setLayout(flw);
}
if (tempr.equalsIgnoreCase(“grid”)) {
if (strng.charAt(0) == ‘(‘) {
tempr = strng.substring(0, strng.indexOf(‘)’) + 1);
strng = strng.substring(tempr.length()).trim();
ArrayList<Integer> instr = getIntAray(tempr);
GridLayout tmpLayout;
if (instr.size() == 2) {
tmpLayout = new GridLayout(instr.get(0),
instr.get(1));
lpnl.setLayout(tmpLayout);
} else if (instr.size() == 4) {
tmpLayout = new GridLayout(instr.get(0),
instr.get(1), instr.get(2), instr.get(3));
lpnl.setLayout(tmpLayout);
}
}
}
}
while (true) {
if (scnr.hasNextLine()) {
strng = scnr.nextLine().trim();
tempr = getLabel(strng);
if (tempr.equalsIgnoreCase(“end”)) {
break;
} else {
Component tmpCompnt = addCompntRec(
strng.substring(tempr.length()), tempr);
if (tmpCompnt != null) {
if (tmpCompnt.getClass() == frame.getClass()) {
System.out.println(“Window cant be nested inside”);
} else
{
lpnl.add(tmpCompnt);
}
}
}
} else
{
System.out.println(“Error in nesting”);
break;
}
}
frame.add(lpnl);
return frame;
}
if (lbl.equalsIgnoreCase(“panel”)) {
strng = strng.trim();
JPanel pnel = new JPanel();
tempr = getLabel(strng);
strng = strng.substring(tempr.length()).trim();
if (tempr.equalsIgnoreCase(“Layout”)) {
tempr = getLabel(strng);
strng = strng.substring(tempr.length()).trim();
if (tempr.equalsIgnoreCase(“flow”)) {
FlowLayout flw = new FlowLayout();
pnel.setLayout(flw);
}
if (tempr.equalsIgnoreCase(“grid”)) {
if (strng.charAt(0) == ‘(‘) {
tempr = strng.substring(0, strng.indexOf(‘)’) + 1);
strng = strng.substring(tempr.length()).trim();
ArrayList<Integer> instr = getIntAray(tempr);
GridLayout tmpLayout;
if (instr.size() == 2) {
tmpLayout = new GridLayout(instr.get(0),
instr.get(1));
pnel.setLayout(tmpLayout);
} else if (instr.size() == 4) {
tmpLayout = new GridLayout(instr.get(0),
instr.get(1), instr.get(2), instr.get(3));
pnel.setLayout(tmpLayout);
}
}
}
}
while (true) {
if (scnr.hasNextLine()) {
strng = scnr.nextLine().trim();
tempr = getLabel(strng);
if (tempr.equalsIgnoreCase(“end”)) {
break;
} else {
Component tmpCompnt = addCompntRec(
strng.substring(tempr.length()), tempr);
if (tmpCompnt != null) {
if (tmpCompnt.getClass() == new JFrame()
.getClass()) {
System.out
.println(“Window cant be nested inside”);
} else {
pnel.add(tmpCompnt);
}
}
}
} else {
System.out.println(“Error in nesting”);
break;
}
}
return pnel;
}
if (lbl.equalsIgnoreCase(“button”)) {
strng = strng.trim();
JButton button;
if (strng.charAt(0) == ‘”‘) {
strng = strng.substring(1);
tempr = strng.substring(0, strng.indexOf(‘\”‘));
button = new JButton(tempr);
strng = strng.substring(strng.indexOf(‘”‘) + 1).trim();
} else {
button = new JButton(“Default title”);
}
return button;
}
if (lbl.equalsIgnoreCase(“lbl”)) {
strng = strng.trim();
JLabel Label;
if (strng.charAt(0) == ‘”‘) {
strng = strng.substring(1);
tempr = strng.substring(0, strng.indexOf(‘\”‘));
Label = new JLabel(tempr);
strng = strng.substring(strng.indexOf(‘”‘) + 1).trim();
} else {
Label = new JLabel(“Default title”);
}
return Label;
}
if (lbl.equalsIgnoreCase(“textfield”)) {
strng = strng.trim();
ArrayList<Integer> li = getIntAray(strng);
JTextField field = new JTextField(li.get(0));
return field;
}
return null;
}
}
input.txt
Window “Calculator” (200, 200) Layout Flow
TextField 20
Panel Layout Grid(4, 3, 5, 5)
Button “7”
Button “8”
Button “9”
Button “4”
Button “5”
Button “6”
Button “1”
Button “2”
Button “3”
Label “”
Button “0”
End
End
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