CSC 353 Compiler design and construction: Write the program in java to replace the value of macro template with the macro expansion in the following lines of code.

1. Write the program in java to replace the value of macro template with the macro expansion in the following lines of code.

Source code:

package assignment1;

import java.io.File;

import java.io.PrintStream;

import java.util.Scanner;

/**

 *

 * @author student

 */

public class Main2 {

    /**

     * @param args the command line arguments

     */

    public static void main(String[] args)throws Exception {

        // TODO code application logic here

        String macro = "";

        String macroValue = "";

        Scanner fin=new Scanner(new File("test.txt"));

        while(fin.hasNext())

        {

            String str = fin.nextLine();

            String str1 []  = str.split(" ");

            //System.out.println(fin.nextLine());

            if(str1[0].equals("#define"))

            {

                macro = str1[1];

                macroValue = str1[2];

            }

        }

        fin.close();

        System.out.println("macro = "+macro);//printf("%s",macro);

        System.out.println("macro value = "+macroValue);

        Scanner fread=new Scanner(new File("test.txt"));

        PrintStream fwrite=new PrintStream(new File("test3.txt"));

        int i,j;

        while(fread.hasNext())

        {

            String str = fread.nextLine();

            int len = macro.length();

            for(i=0; i < str.length(); i++)

            {                            

                 if(str.charAt(i) == '"' )

                    {

                        do{

                            fwrite.print(str.charAt(i));

                            i++;

                        }while((str.charAt(i)!='"'));

                        fwrite.print(str.charAt(i));

                       

                       

                    }

                 else if (str.charAt(i) == macro.charAt(0) && str.charAt(0) != '#')

                    {

                             if(Character.isLetterOrDigit(str.charAt(i+macro.length())) || Character.isLetterOrDigit(str.charAt(i-1)))

                             fwrite.print(macro);

                             else

                             {

                             String temp = "";

                             for(j=i; j<i+len; j++)

                             {

                                temp = temp + str.charAt(j);

                            }

                   //System.out.println("temp ="+temp);

                            if(temp.equals(macro))

                                {

                                       fwrite.print(macroValue);

                       // if(str.charAt(i+temp.length()))

                            }

                            }

                            i = i + len-1;

                }

                  else

                {

                             fwrite.print(str.charAt(i));

                }

            }

            fwrite.println();

        }

       

    }

}

Output: