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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 {
/**
* Roll the dice once
*
* @return The result of rowing the dice
*/
public int roll();
/**
* 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");
}
/**
* 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;
}
/**
* Parse this node into an expression
* @param exp The string to convert to an expression
*
* @return The node in expression form
*/
static IDiceExpression toExpression(String exp) {
String literalData = exp;
if (StringUtils.containsInfixOperator(literalData, "c")) {
String[] strangs = literalData.split("c");
return new CompoundDice(strangs);
} else if (StringUtils.containsInfixOperator(literalData,
"d")) {
/*
* Handle dice groups
*/
return ComplexDice.fromString(literalData);
} else {
try {
return new ScalarDie(Integer.parseInt(literalData));
} catch (NumberFormatException nfex) {
UnsupportedOperationException usex = new UnsupportedOperationException(
"Found malformed leaf token " + exp);
usex.initCause(nfex);
throw usex;
}
}
}
}
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