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package bjc.dicelang.dice;
import java.util.Random;
import java.util.function.Predicate;
import java.util.regex.Pattern;
/**
* Contains static methods for producing dice from strings.
*
* @author Ben Culkin
*/
public class DiceBox {
static final Random rng = new Random();
/**
* Parse a die expression from a string.
*
* @return The die expression from the string, or null if it wasn't one
*/
public static DieExpression parseExpression(String exp) {
/*
* Only bother will valid expressions
*/
if(!isValidExpression(exp)) return null;
if(scalarDiePattern.matcher(exp).matches()) {
/*
* Parse scalar die
*/
Die scal = new ScalarDie(Long.parseLong(exp.substring(0, exp.indexOf('s'))));
return new DieExpression(scal);
} else if(simpleDiePattern.matcher(exp).matches()) {
/*
* Parse simple die groups
*/
String[] dieParts = exp.split("d");
long right = Long.parseLong(dieParts[1]);
if(dieParts[0].equals("")) {
/*
* Handle short-form expressions.
*/
Die scal = new SimpleDie(1, right);
return new DieExpression(scal);
} else {
Die scal = new SimpleDie(Long.parseLong(dieParts[0]), right);
return new DieExpression(scal);
}
} else if(fudgeDiePattern.matcher(exp).matches()) {
/*
* Parse fudge dice
*/
String nDice = exp.substring(0, exp.indexOf('d'));
return new DieExpression(new FudgeDie(Long.parseLong(nDice)));
} else if(compoundDiePattern.matcher(exp).matches()) {
/*
* Parse compound die expressions
*/
String[] dieParts = exp.split("c");
DieExpression left = parseExpression(dieParts[0]);
DieExpression right = parseExpression(dieParts[1]);
return new DieExpression(new CompoundDie(left.scalar, right.scalar));
} else if(compoundingDiePattern.matcher(exp).matches()) {
/*
* Parse compounding die expressions
*/
String[] dieParts = exp.split("!!");
DieExpression left = parseExpression(dieParts[0]);
Predicate<Long> right = deriveCond(dieParts[1]);
Die scal = new CompoundingDie(left.scalar, right, dieParts[1]);
return new DieExpression(scal);
} else if(explodingDiePattern.matcher(exp).matches()) {
/*
* Parse exploding die expressions
*/
String[] dieParts = exp.split("!");
DieExpression left = parseExpression(dieParts[0]);
Predicate<Long> right = deriveCond(dieParts[1]);
DieList lst = new ExplodingDice(left.scalar, right, dieParts[1], false);
return new DieExpression(lst);
} else if(penetratingDiePattern.matcher(exp).matches()) {
/*
* Parse penetrating die expressions
*/
String[] dieParts = exp.split("p!");
DieExpression left = parseExpression(dieParts[0]);
Predicate<Long> right = deriveCond(dieParts[1]);
DieList lst = new ExplodingDice(left.scalar, right, dieParts[1], true);
return new DieExpression(lst);
} else if(diceListPattern.matcher(exp).matches()) {
/*
* Parse simple die lists
*/
String[] dieParts = exp.split("dl");
DieExpression left = parseExpression(dieParts[0]);
DieExpression right = parseExpression(dieParts[1]);
DieList lst = new SimpleDieList(left.scalar, right.scalar);
return new DieExpression(lst);
}
return null;
}
/*
* The strings and patterns used for matching
*/
/*
* Defines a comparison predicate
*/
private static final String comparePoint = "[<>=]\\d+";
/*
* Defines a scalar die.
*
* This is just a number.
*/
private static final String scalarDie = "[\\+\\-]?\\d+sd";
private static final Pattern scalarDiePattern = Pattern.compile("\\A" + scalarDie + "\\Z");
/*
* Defines a simple die.
*
* This is a group of one or more dice of the same size.
*/
private static final String simpleDie = "(?:\\d+)?d\\d+";
private static final Pattern simpleDiePattern = Pattern.compile("\\A" + simpleDie + "\\Z");
/*
* Defines a fudge die.
*
* This is like a simple die, but all the die give -1, 0, or 1 as
* results.
*/
private static final String fudgeDie = "(?:\\d+)?dF";
private static final Pattern fudgeDiePattern = Pattern.compile("\\A" + fudgeDie + "\\Z");
/*
* Defines a compound die.
*
* This is like using two d10's to simulate a d100
*/
private static final String compoundDie = simpleDie + "c(?:(?:" + simpleDie + ")|(?:\\d+))";
private static final Pattern compoundDiePattern = Pattern.compile("\\A" + compoundDie + "\\Z");
/*
* Defines a compound group.
*
* This is used for forming die list type expressions.
*/
private static final String compoundGroup = "(?:(?:" + scalarDie + ")|(?:" + simpleDie + ")|(?:"
+ compoundDie + ")|(?:" + fudgeDie +"))";
/*
* Defines a compounding die.
*
* This is like an exploding die, but is a single die, not a group of
* them.
*/
private static final String compoundingDie = compoundGroup + "!!" + comparePoint;
private static final Pattern compoundingDiePattern = Pattern.compile("\\A" + compoundingDie + "\\Z");
/*
* Defines an exploding die.
*
* This is a die that you reroll the component of if it meets a certain
* condition.
*/
private static final String explodingDie = compoundGroup + "!" + comparePoint;
private static final Pattern explodingDiePattern = Pattern.compile("\\A" + explodingDie + "\\Z");
/*
* Defines a penetrating die.
*
* This is like an exploding die, but the exploded result gets a -1
* penalty.
*/
private static final String penetratingDie = compoundGroup + "!" + comparePoint;
private static final Pattern penetratingDiePattern = Pattern.compile("\\A" + penetratingDie + "\\Z");
/*
* Defines a die list.
*
* This is an array of dice of the specified size
*/
private static final String diceList = compoundGroup + "dl" + compoundGroup;
private static final Pattern diceListPattern = Pattern.compile("\\A" + diceList + "\\Z");
/**
* Check if a given string is a valid die expression.
*
* @param exp The string to check validity of.
*
* @return Whether or not the string is a valid command
*/
public static boolean isValidExpression(String exp) {
if(scalarDiePattern.matcher(exp).matches()) {
return true;
} else if(simpleDiePattern.matcher(exp).matches()) {
return true;
} else if(fudgeDiePattern.matcher(exp).matches()) {
return true;
} else if(compoundDiePattern.matcher(exp).matches()) {
return true;
} else if(compoundingDiePattern.matcher(exp).matches()) {
return true;
} else if(explodingDiePattern.matcher(exp).matches()) {
return true;
} else if(penetratingDiePattern.matcher(exp).matches()) {
return true;
} else if (diceListPattern.matcher(exp).matches()) {
return true;
} else {
return false;
}
}
/*
* Derive a predicate from a compare point
*/
private static Predicate<Long> deriveCond(String patt) {
long num = Long.parseLong(patt.substring(1));
switch(patt.charAt(0)) {
case '<':
return (roll) -> roll < num;
case '=':
return (roll) -> roll == num;
case '>':
return (roll) -> roll > num;
default:
return (roll) -> false;
}
}
}
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