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package bjc.rgens.parser;
import bjc.rgens.parser.elements.CaseElement;
import bjc.utils.funcdata.IList;
/*
* @NOTE
* If at some point we add new case types, they should go into subclasses,
* not into this class.
*/
/**
* A case in a rule in a randomized grammar.
*
* @author EVE
*/
public abstract class RuleCase {
/**
* The possible types of a case.
*
* @author EVE
*/
public static enum CaseType {
/** A normal case, composed from a list of elements. */
NORMAL,
/** A case that doesn't insert spaces. */
SPACEFLATTEN,
/** A case that applies a regex after generation. */
REGEX;
}
/** The type of this case. */
public final CaseType type;
/**
* The list of element values for this case.
*
* <h2>Used For</h2>
* <dl>
* <dt>NORMAL, SPACEFLATTEN</dt>
* <dd>Used as the list of elementList the rule is composed of.</dd>
* </dl>
*/
protected IList<CaseElement> elementList;
protected RuleCase(CaseType typ) {
type = typ;
}
/**
* Create a new case of the specified type that takes a element list
* parameter.
*
* @param typ
* The type of case to create.
*
* @param elements
* The element list parameter of the case.
*
* @throws IllegalArgumentException
* If this type doesn't take a element list parameter.
*/
public RuleCase(CaseType typ, IList<CaseElement> elements) {
this(typ);
switch (typ) {
case NORMAL:
case SPACEFLATTEN:
break;
case REGEX:
throw new IllegalArgumentException("This type requires an element list and a pattern");
default:
throw new IllegalArgumentException("This type doesn't have a element list parameter");
}
elementList = elements;
}
public abstract void generate(GenerationState state);
/**
* Get the element list value of this type.
*
* @return
* The element list value of this case, or null if this type
* doesn't have one.
*/
public IList<CaseElement> getElements() {
return elementList;
}
}
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