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package bjc.dicelang;
import bjc.utils.funcutils.StringUtils;
/**
* An expression for something that can be rolled like a polyhedral die
*
* @author ben
*
*/
@FunctionalInterface
public interface IDiceExpression {
/**
* Parse a string into an expression.
*
* It can accept the following types of expressions
* <ul>
* <li>Simple integers - '2'</li>
* <li>Simple dice - 'd6'</li>
* <li>Groups of simple dice - '2d6'</li>
* <li>Number concatenation - '2c6'</li>
* <li>Dice concatenation - '1d10c1d10</li>
* </ul>
*
* Dice concatenation is like using 2 d10s to emulate a d100, so
* instead of adding them, it reads them side by side.
*
* @param expression
* The string to convert to an expression
*
* @return The string, converted into expression form
*/
static IDiceExpression toExpression(String expression) {
String literalData = expression;
String diceMatcher = "\\Ad\\d+\\Z";
if (StringUtils.containsInfixOperator(literalData, "c")) {
// Parse a compound die
String[] strangs = literalData.split("c");
return new CompoundDice(strangs);
} else if (StringUtils.containsInfixOperator(literalData, "d")) {
// Handle groups of similiar dice
return ComplexDice.fromString(literalData);
} else if (literalData.matches(diceMatcher)) {
// Handle people who put 'd6' instead of '1d6'
return new Die(Integer.parseInt(literalData.substring(1)));
} else {
// Parse a scalar number
try {
return new ScalarDie(Integer.parseInt(literalData));
} catch (NumberFormatException nfex) {
UnsupportedOperationException usex = new UnsupportedOperationException(
"Found malformed leaf token " + expression + ". Floating point numbers " +
"are not supported.");
usex.initCause(nfex);
throw usex;
}
}
}
/**
* Check if this expression can be optimized to a scalar value
*
* @return Whether or not this expression can be optimized to a scalar
* value
*/
public default boolean canOptimize() {
return false;
}
/**
* Optimize this expression to a scalar value
*
* @return This expression, optimized to a scalar value
*
* @throws UnsupportedOperationException
* if this type of expression can't be optimized
*/
public default int optimize() {
throw new UnsupportedOperationException(
"Can't optimize this type of expression");
}
/**
* Roll the dice once
*
* @return The result of rowing the dice
*/
public int roll();
}
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