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package bjc.utils.gen;
import java.util.HashMap;
import bjc.utils.funcdata.FunctionalList;
/**
* A weighted grammar where all the rules have a equal chance of occuring.
*
* @author ben
*
* @param <E>
* The type of grammar elements to use.
*/
public class RandomGrammar<E> extends WeightedGrammar<E> {
/**
* Create a new random grammar.
*/
public RandomGrammar() {
rules = new HashMap<>();
}
/**
* Add cases to a specified rule.
*
* @param rule
* The name of the rule to add cases to.
* @param cases
* The cases to add for this rule.
*/
@SafeVarargs
public final void addCases(E rule, FunctionalList<E>... cases) {
for (FunctionalList<E> currentCase : cases) {
super.addCase(rule, 1, currentCase);
}
}
/**
* Create a rule with the specified name and cases.
*
* @param rule
* The name of the rule to add.
* @param cases
* The cases to add for this rule.
*/
@SafeVarargs
public final void makeRule(E rule, FunctionalList<E>... cases) {
super.addRule(rule);
for (FunctionalList<E> currentCase : cases) {
super.addCase(rule, 1, currentCase);
}
}
/**
* Create a rule with the specified name and cases.
*
* @param rule
* The name of the rule to add.
* @param cases
* The cases to add for this rule.
*/
public void makeRule(E rule, FunctionalList<FunctionalList<E>> cases) {
if (cases == null) {
throw new NullPointerException("Cases must not be null");
}
super.addRule(rule);
cases.forEach(currentCase -> super.addCase(rule, 1, currentCase));
}
}
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