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package bjc.dicelang.v2;
import java.util.Random;
import java.util.regex.Pattern;
public class DiceBox {
private static final Random rng = new Random();
public interface Die {
boolean canOptimize();
int optimize();
int roll();
}
private static class ScalarDie implements Die {
private int val;
public ScalarDie(int vl) {
val = vl;
}
public boolean canOptimize() {
return true;
}
public int optimize() {
return val;
}
public int roll() {
return val;
}
public String toString() {
return Integer.toString(val);
}
}
private static class SimpleDie implements Die {
private int numDice;
private int diceSize;
public SimpleDie(int nDice, int size) {
numDice = nDice;
diceSize = size;
}
public boolean canOptimize() {
if(diceSize == 1) return true;
else return false;
}
public int optimize() {
return numDice;
}
public int roll() {
int total = 0;
for(int i = 0; i < numDice; i++) {
total += rng.nextInt(i) + 1;
}
return total;
}
public String toString() {
return numDice + "d" + diceSize;
}
}
private static class CompoundDie implements Die {
private Die left;
private Die right;
public CompoundDie(Die lft, Die rght) {
left = lft;
right = rght;
}
public boolean canOptimize() {
return left.canOptimize() && right.canOptimize();
}
public int optimize() {
return left.optimize() + "" + right.optimize();
}
public int roll() {
return Integer.parseInt(left.roll() + "" + right.roll());
}
}
public static Die parseExpression(String exp) {
if(!isValidExpression(exp)) return null;
if(scalarDiePattern.matcher(exp).matches()) {
return new ScalarDie(Integer.parseInt(exp));
} else if(simpleDiePattern.matcher(exp).matches()) {
String[] dieParts = exp.split("d");
if(dieParts[0].equals("")) {
return new SimpleDie(1, Integer.parseInt(dieParts[1]));
} else {
return new SimpleDie(Integer.parseInt(dieParts[0]), Integer.parseInt(dieParts[1]));
}
} else if(compoundDiePattern.matcher(exp).matches()) {
String[] dieParts = exp.split("c");
return new CompoundDie(parseExpression(dieParts[0]), parseExpression(dieParts[1]));
}
return null;
}
private static final Pattern scalarDiePattern = Pattern.compile(
"[\\+\\-]?\\d+");
private static final Pattern simpleDiePattern = Pattern.compile(
"(?:\\d+)?d\\d+");
private static final Pattern compoundDiePattern = Pattern.compile(
simpleDiePattern + "c(?:(?:" + simpleDiePattern + ")|(?:\\d+))";
public static boolean isValidExpression(String exp) {
if(scalarDiePattern.matcher(exp).matches()) {
return true;
} else if(simpleDiePattern.matcher(exp).matches()) {
return true;
} else if (compoundDiePattern.matcher(exp).matches()) {
return true;
} else {
return false;
}
}
}
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