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Interpreter.java
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557 lines (543 loc) · 12.9 KB
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import java.io.BufferedReader;
import java.io.IOException;
import java.util.*;
import java.io.FileReader;
public class Compiler{
public String vDir = "d";
public String hDir = "n";
public int vPos = 0;
public int hPos = 0;
public String[][] map;
public ArrayList<Integer> stack = new ArrayList<Integer>();
public boolean debugging = false;
public void changeDir(String dir){
switch(dir){
case "u":
vDir = "u";
hDir = "n";
break;
case "ur":
vDir = "u";
hDir = "r";
break;
case "r":
vDir = "n";
hDir = "r";
break;
case "dr":
vDir = "d";
hDir = "r";
break;
case "d":
vDir = "d";
hDir = "n";
break;
case "dl":
vDir = "d";
hDir = "l";
break;
case "l":
vDir = "n";
hDir = "l";
break;
case "ul":
vDir = "u";
hDir = "l";
break;
default:
break;
}
}
public void cont(){
if(debugging){
System.out.println("Current Coords: " + (hPos+1) + "," + (vPos+1));
System.out.println(stack);
System.out.println("\n");
}
if(hDir.equals("n") && vDir.equals("u")){
vPos--;
} else if(hDir.equals("r") && vDir.equals("u")){
vPos--;
hPos++;
} else if(hDir.equals("r") && vDir.equals("n")){
hPos++;
} else if(hDir.equals("r") && vDir.equals("d")){
vPos++;
hPos++;
} else if(hDir.equals("n") && vDir.equals("d")){
vPos++;
} else if(hDir.equals("l") && vDir.equals("d")){
vPos++;
hPos--;
} else if(hDir.equals("l") && vDir.equals("n")){
hPos--;
} else if(hDir.equals("l") && vDir.equals("u")){
vPos--;
hPos--;
}
interpret();
}
public void createMap(String str) {
String[] rows = str.split("#");
String[][] mkMap = new String[rows.length][];
int i = 0;
for(String row : rows) {
mkMap[i++] = row.split("");
}
map = mkMap.clone();
}
public void error(String err){
System.out.println("Error at (" + (hPos+1) + "," + (vPos+1) + "): " + err);
}
public boolean hasChar(int v, int h){
try{
return !map[v][h].equals(" ");
} catch (ArrayIndexOutOfBoundsException e){
return false;
}
}
public void interpret(){
String dirEr = "Wrong direction";
try {
switch(map[vPos][hPos]){
case "|":
if(hDir.equals("n")){
if(debugging){
System.out.println("|: Continuing vertically");
}
cont();
} else {
error(dirEr);
}
break;
case "-":
if(vDir.equals("n")){
if(debugging){
System.out.println("-: Continuing horizontally");
}
cont();
} else {
error(dirEr);
}
break;
case "/":
if((vDir.equals("u") && hDir.equals("r")) || (vDir.equals("d") && hDir.equals("l"))){
if(debugging){
System.out.println("/: Continuing diagonally");
}
cont();
} else {
error(dirEr);
}
break;
case "\\":
if((vDir.equals("d") && hDir.equals("r")) || (vDir.equals("u") && hDir.equals("l"))){
if(debugging){
System.out.println("\\: Continuing diagonally");
}
cont();
} else {
error(dirEr);
}
break;
case "+":
if(debugging){
System.out.println("+: Incrementing the top value on the stack");
}
try{
int temp = stack.get(stack.size()-1);
temp++;
stack.remove(stack.size()-1);
stack.add(temp);
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to increment a nonexistant value on the stack");
}
break;
case "_":
if(debugging){
System.out.println("_: Decrementing the top value on the stack");
}
try{
int temp = stack.get(stack.size()-1);
temp--;
stack.remove(stack.size()-1);
stack.add(temp);
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to decrement a nonexistant value on the stack");
}
break;
case "*":
if(debugging){
System.out.println("*: Multiplying the top two numbers on the stack");
}
try{
int temp1 = stack.get(stack.size()-1);
int temp2 = stack.get(stack.size()-2);
int temp3 = temp1*temp2;
stack.remove(stack.size()-1);
stack.remove(stack.size()-1);
stack.add(temp3);
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to multiply a nonexistant value on the stack");
}
break;
case "<":
if(debugging){
System.out.println("<: Checking if the top value is geater than 0");
}
if(hDir.equals("r")){
if(stack.get(stack.size()-1) > 0){
changeDir("ur");
} else {
changeDir("dr");
}
cont();
} else {
error(dirEr);
}
break;
case ">":
if(debugging){
System.out.println(">: Checking if the top value is geater than 0");
}
if(hDir.equals("l")){
if(stack.get(stack.size()-1) > 0){
changeDir("ul");
} else {
changeDir("dl");
}
cont();
} else {
error(dirEr);
}
break;
case "^":
if(debugging){
System.out.println("^: Checking if the top value is geater than 0");
}
if(vDir.equals("d")){
if(stack.get(stack.size()-1) > 0){
changeDir("dr");
} else {
changeDir("dl");
}
cont();
} else {
error(dirEr);
}
break;
case "a":
if(debugging){
System.out.println("a: Adding the top two numbers on the stack");
}
try{
int temp1 = stack.get(stack.size()-1);
int temp2 = stack.get(stack.size()-2);
int temp3 = temp1+temp2;
stack.remove(stack.size()-1);
stack.remove(stack.size()-1);
stack.add(temp3);
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to add a nonexistant value on the stack");
}
break;
case "b":
if(debugging){
System.out.println("b: Printing the integer value on the top of the stack");
}
try {
System.out.print(stack.get(stack.size()-1));
if(debugging){
System.out.println("");
}
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to print a nonexistant value on the stack");
}
break;
case "c":
if(debugging){
System.out.println("c: Changing direction clockwise");
}
scanC();
break;
case "d":
if(debugging){
System.out.println("d: Dividing the top two numbers on the stack");
}
try{
int temp1 = stack.get(stack.size()-1);
int temp2 = stack.get(stack.size()-2);
int temp3 = (int)Math.floor(temp1/temp2);
stack.remove(stack.size()-1);
stack.remove(stack.size()-1);
stack.add(temp3);
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to divide a nonexistant value on the stack");
}
break;
case "e":
if(debugging){
System.out.println("e: ending the program");
}
break;
case "f":
if(debugging){
System.out.println("f: Removing the top value from the stack");
}
try {
stack.remove(stack.size()-1);
} catch(ArrayIndexOutOfBoundsException e){
error("tried to remove item " + (stack.size()-1) + " from stack of size " + stack.size());
}
cont();
break;
case "j":
if(debugging){
System.out.println("j: Jumping to coordinates given by the top two values on the stack");
System.out.println("Current Coords: " + (hPos+1) + "," + (vPos+1));
System.out.println(stack);
System.out.println("\n");
}
try{
int jumpH = stack.get(stack.size()-1);
int jumpV = stack.get(stack.size()-2);
hPos = jumpH-1;
vPos = jumpV-1;
interpret();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to jump using a nonexistant value on the stack");
}
break;
case "n":
if(debugging){
System.out.println("n: adding 0 to the stack");
}
stack.add(0);
cont();
break;
case "o":
if(debugging){
System.out.println("o: Changing direction counter-clockwise");
}
scanCC();
break;
case "p":
if(debugging){
System.out.println("p: Printing the ASCII character indicated by the top value on the stack");
}
try{
System.out.print((char)(int)stack.get(stack.size()-1));
if(debugging){
System.out.println("");
}
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to increment a nonexistant value on the stack");
}
break;
case "r":
if(debugging){
System.out.println("r: reversing direction");
}
if(hDir.equals("l")){
hDir = "r";
} else if(hDir.equals("r")){
hDir = "l";
}
if(vDir.equals("u")){
vDir = "d";
} else if(vDir.equals("d")){
vDir = "u";
}
cont();
break;
case "s":
if(debugging){
System.out.println("s: Subtracting the top two numbers on the stack");
}
try{
int temp1 = stack.get(stack.size()-1);
int temp2 = stack.get(stack.size()-2);
int temp3 = temp1-temp2;
stack.remove(stack.size()-1);
stack.remove(stack.size()-1);
stack.add(temp3);
cont();
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to subtract a nonexistant value on the stack");
}
break;
case "u":
if(debugging){
System.out.println("u: getting value from user input");
}
try{
Scanner user = new Scanner(System.in);
int input = user.nextInt();
stack.add(input);
cont();
}catch(InputMismatchException e){
error("Input must be an integer");
}
break;
default:
error("Unknown character: " + map[vPos][hPos]);
break;
}
} catch(ArrayIndexOutOfBoundsException e) {
error("Tried to interpret at nonexistant coords");
}
}
public void scanC(){
String dirEr = "Wrong direction";
if(hDir.equals("n") && vDir.equals("u")){
if(hasChar(vPos-1, hPos)){
cont();
} else {
changeDir("ur");
scanC();
}
} else if(hDir.equals("r") && vDir.equals("u")){
if(hasChar(vPos-1, hPos+1)){
cont();
} else {
changeDir("r");
scanC();
}
} else if(hDir.equals("r") && vDir.equals("n")){
if(hasChar(vPos, hPos+1)){
cont();
} else {
changeDir("dr");
scanC();
}
} else if(hDir.equals("r") && vDir.equals("d")){
if(hasChar(vPos+1, hPos+1)){
cont();
} else {
changeDir("d");
scanC();
}
} else if(hDir.equals("n") && vDir.equals("d")){
if(hasChar(vPos+1, hPos)){
cont();
} else {
changeDir("dl");
scanC();
}
} else if(hDir.equals("l") && vDir.equals("d")){
if(hasChar(vPos+1, hPos-1)){
cont();
} else {
changeDir("l");
scanC();
}
} else if(hDir.equals("l") && vDir.equals("n")){
if(hasChar(vPos, hPos-1)){
cont();
} else {
changeDir("ul");
scanC();
}
} else if(hDir.equals("l") && vDir.equals("u")){
if(hasChar(vPos-1, hPos-1)){
cont();
} else {
changeDir("u");
scanC();
}
}
}
public void scanCC(){
String dirEr = "Wrong direction";
if(hDir.equals("n") && vDir.equals("u")){
if(hasChar(vPos-1, hPos)){
cont();
} else {
changeDir("ul");
scanCC();
}
} else if(hDir.equals("r") && vDir.equals("u")){
if(hasChar(vPos-1, hPos+1)){
cont();
} else {
changeDir("u");
scanCC();
}
} else if(hDir.equals("r") && vDir.equals("n")){
if(hasChar(vPos, hPos+1)){
cont();
} else {
changeDir("ur");
scanCC();
}
} else if(hDir.equals("r") && vDir.equals("d")){
if(hasChar(vPos+1, hPos+1)){
cont();
} else {
changeDir("r");
scanCC();
}
} else if(hDir.equals("n") && vDir.equals("d")){
if(hasChar(vPos+1, hPos)){
cont();
} else {
changeDir("dr");
scanCC();
}
} else if(hDir.equals("l") && vDir.equals("d")){
if(hasChar(vPos+1, hPos-1)){
cont();
} else {
changeDir("d");
scanCC();
}
} else if(hDir.equals("l") && vDir.equals("n")){
if(hasChar(vPos, hPos-1)){
cont();
} else {
changeDir("dl");
scanCC();
}
} else if(hDir.equals("l") && vDir.equals("u")){
if(hasChar(vPos-1, hPos-1)){
cont();
} else {
changeDir("l");
scanCC();
}
}
}
public String readFile(String filename) throws IOException {
StringBuilder builder = new StringBuilder();
try(BufferedReader reader = new BufferedReader(new FileReader(filename))) {
String line = reader.readLine();
while (line != null) {
builder.append(line);
builder.append("#");
line = reader.readLine();
}
return builder.toString();
} catch(IOException e){
return e.toString();
}
}
public static void main(String[] args){
Compiler x = new Compiler();
try{
x.createMap(x.readFile(args[0]));
if(x.debugging){
System.out.println(Arrays.deepToString(x.map) + "\n");
}
x.interpret();
} catch(IOException|ArrayIndexOutOfBoundsException e) {
System.out.println("Please pass a valid filename as an argument, in this form: java Compiler <filename>");
}
}
}