public static void main(String[] args) {
// Create new File
File intFile = Utility.checkFile("INTFILE");
OPTAB optab = new OPTAB();
ArrayList<String> lines = new ArrayList<String>();
lines = Utility.readAllLines("SRCFILE");
String line;
int i = 0;
line = lines.get(i); // Read next input line
while (isComment(line)) {
i++;
line = lines.get(i);
isCommentflag = true;
}
if (Utility.readStm(line, "opcode").equals("start")) // if OPCODE = 'START' then
{
int h = Utility.readStm(line, "operand").length();
startAddress = startAddress.substring(0, 6 - h) + Utility.readStm(line, "operand");
locctr = startAddress;
address = locctr;
Utility.writeToINT(line, intFile, startAddress, isCommentflag);
isCommentflag = false;
} else {
locctr = "0"; // else initialize locctr to zero
}
i++;
line = lines.get(i);
while (!Utility.readStm(line, "opcode").equals("end")) // while OPCODE != END
{
Utility.writeToINT(line, intFile, address.toUpperCase(), isCommentflag);
if (!isComment(line)) { // If line is not a comment
String label = Utility.readStm(line, "label");
String code = Utility.readStm(line, "opcode");
String operand = Utility.readStm(line, "operand");
absrel.putIfAbsent(label, "R");
// check on labels:
if (symtab.containsKey(
label)) { // If there is a label in the LABEL field, search symtab for Label
if (code.equals("equ")) { // If opcode is EQU, replace old value with new operand value
symtab.replace(label, operand);
} else {
printError("Duplicate Label");
}
} else if (!label.equals("")) { // If LABEL exists but not in SYMTAB
/*if (code.equals("word") || code.equals("byte")) {
symtab.put(label, operand);
} else {*/
symtab.put(label, locctr); // Insert Label into symtable
} /*else {
printError("Illegal Operand Expression");
}*/
// check on opcodes:
if (OPTAB.optab.containsKey(code)) { // Search optab for opcode
{
locctr = addHex(locctr, 3); // Found; Add 3 to locctr
int h = locctr.length();
isCommentflag = false;
address = "000000";
address = address.substring(0, 6 - h) + locctr;
}
} else if (code.equals("word")) { // opcode not found but equal to WORD
locctr = addHex(locctr, 3); // Founnd; Add 3 to locctr
int h = locctr.length();
isCommentflag = false;
address = "000000";
address = address.substring(0, 6 - h) + locctr;
} else if (code.equals("resw")) { // opcode not found but equal to RESW
try {
int operandOp = 3 * Integer.parseInt(operand);
locctr = addHex(locctr, operandOp); // Found; 3*operand+locctr
int h = locctr.length();
isCommentflag = false;
address = "000000";
address = address.substring(0, 6 - h) + locctr;
} catch (Exception ex) {
printError("Invalid Operator");
}
} else if (code.equals("resb")) { // opcode not found but equal to BYTE
try {
locctr = addHex(locctr, Integer.parseInt(operand)); // Found; add #operand to locctr
int h = locctr.length();
isCommentflag = false;
address = "000000";
address = address.substring(0, 6 - h) + locctr;
} catch (Exception ex) {
printError("Invalid Operator");
}
} else if (code.equals("byte")) {
int byteLength = operand.length(); // find length in bytes
try {
locctr = addHex(locctr, byteLength); // add length to LOCCTR
int h = locctr.length();
isCommentflag = false;
address = "000000";
address = address.substring(0, 6 - h) + locctr;
} catch (Exception ex) {
printError("Invalid Operator");
}
} else if (code.equals("equ")) {
absrel.putIfAbsent(label, "A");
} else if (code.equals("org")) {
address = "000000";
if (!operand.equals("")) {
buffer = locctr;
if (symtab.containsKey(operand)) {
locctr = (String) symtab.get(operand);
} else if (operand.matches(".*[0-9].*")) {
int g = Integer.parseInt(operand);
locctr = Integer.toHexString(g);
}
} else {
locctr = buffer;
}
int h = locctr.length();
address = address.substring(0, 6 - h) + locctr;
} else {
printError("Invalid Operation Code");
}
}
i++;
line = lines.get(i);
while (isComment(line)) {
i++;
line = lines.get(i);
isCommentflag = true;
}
}
if (Utility.readStm(line, "opcode").equals("end")) {
address = "000000";
int h = locctr.length();
address = address.substring(0, 6 - h) + locctr;
Utility.writeToINT(line, intFile, address.toUpperCase(), isCommentflag);
}
try {
programLength = Integer.parseInt(locctr, 16) - Integer.parseInt(startAddress, 16);
} catch (NumberFormatException ex) {
}
System.out.println("Start Address = " + startAddress);
System.out.println("LCCTR = " + locctr.toUpperCase());
System.out.println("Program Length = " + programLength);
Pass2.pass_2();
}
