MacroPass1.java

import java.io.*;
import java.util.*;

public class MacroPass1 {

	public static void main(String[] args) {
		String[][] replacements = {{"&ARG0", "#0"}, 
                           {"&ARG1", "#1"},
                           {"&ARG2", "#2"},
                           {"&ARG3", "#3"}};
		String line=null;
		try {
			FileReader fileReader = new FileReader("prog.txt");
			BufferedReader fr = new BufferedReader(fileReader);
	  		int t=1;
	  		String[] mdt = new String[100];
	  		String[] mnt = new String[100];
	  		String[] ala = new String[100];
	  		String elements[] = new String[100];
	  		int mdtc = 0, mntc = 0, flag = 0;
	  		while((line = fr.readLine()) != null)
	  		{
	  			if(line.equals("MACRO")) {
	  				do {
	  					line = fr.readLine();
	  					if(flag == 0) {
					  		elements= line.split("[ ,]");
					  		mnt[mntc++] = elements[0] + " " + mdtc;
					  		flag = 1;
	  					}
	  					if(line != null) {
		  					for(String[] replacement: replacements) {
		  						line = line.replace(replacement[0], replacement[1]);
	  						}
	  						mdt[mdtc++] = line;
	  					} else {
	  						break;
	  					}
	  				} while(!line.equals("MEND"));
	  			}
	  			flag = 0;
	  		}
	  		
	  		System.out.println("\n***** MDT: *****\n");
	  		for(int i = 0; i < mdtc; i++) {
	  			System.out.println(i + "\t" + mdt[i]);
	  		}
	  		
	  		System.out.println("\n***** MNT: *****\n");
	  		for(int i = 0; i < mntc; i++) {
	  			System.out.println(i + "\t" + mnt[i]);
	  		}
	  		System.out.println("\n***** ALA *****\n");
	  		for(int i = 1; i < elements.length; i++) {
	  			System.out.println("#" + (i-1) + "\t" + elements[i]);
	  		}
	  		fr.close();
	  	}
	  	catch (Exception e) {
	  		System.out.println(e);
	  	}
	}   
}

/*
INPUT: prog.txt:

MACRO
INCR &ARG1,&ARG2,&ARG3
A 1,&ARG1
A 2,&ARG2
A 3,&ARG3
MEND
INCR DATA1,DATA2,DATA3


OUTPUT:
***** MDT: *****

0       INCR #1,#2,#3
1       A 1,#1
2       A 2,#2
3       A 3,#3
4       MEND

***** MNT: *****

0       INCR 0

***** ALA *****

#0      &ARG1
#1      &ARG2
#2      &ARG3

*/