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package bjc.rgens.newparser;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
import java.util.Random;
/**
* A rule in a randomized grammar.
*
* @author EVE
*
*/
public class Rule {
/**
* The name of this grammar rule.
*/
public final String name;
private IList<RuleCase> cases;
/**
* Create a new grammar rule.
*
* @param ruleName
* The name of the grammar rule.
*
* @throws IllegalArgumentException
* If the rule name is invalid.
*/
public Rule(String ruleName) {
if (ruleName == null) {
throw new NullPointerException("Rule name must not be null");
} else if (ruleName.equals("")) {
throw new IllegalArgumentException("The empty string is not a valid rule name");
}
name = ruleName;
cases = new FunctionalList<>();
}
/**
* Adds a case to the rule.
*
* @param cse
* The case to add.
*/
public void addCase(RuleCase cse) {
if (cse == null) {
throw new NullPointerException("Case must not be null");
}
cases.add(cse);
}
/**
* Get a random case from this rule.
*
* @return A random case from this rule.
*/
public RuleCase getCase() {
return cases.randItem();
}
/**
* Get a random case from this rule.
*
* @param rnd
* The random number generator to use.
*
* @return A random case from this rule.
*/
public RuleCase getCase(Random rnd) {
return cases.randItem(rnd::nextInt);
}
/**
* Get all the cases of this rule.
*
* @return All the cases in this rule.
*/
public IList<RuleCase> getCases() {
return cases;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((cases == null) ? 0 : cases.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (!(obj instanceof Rule)) return false;
Rule other = (Rule) obj;
if (cases == null) {
if (other.cases != null) return false;
} else if (!cases.equals(other.cases)) return false;
if (name == null) {
if (other.name != null) return false;
} else if (!name.equals(other.name)) return false;
return true;
}
@Override
public String toString() {
return String.format("Rule [ruleName='%s', ruleCases=%s]", name, cases);
}
}
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