Helper SpecialScore

Jan Burse, created Aug 17. 2019
package jekpro.frequent.basic;
import jekpro.model.inter.AbstractSpecial;
import jekpro.model.inter.Engine;
import jekpro.model.molec.Display;
import jekpro.model.molec.EngineMessage;
import jekpro.reference.structure.SpecialUniv;
* <p>Provides built-in predicates for the module foreign.</p>
* <p/>
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public final class SpecialScore extends AbstractSpecial {
private final static int SPECIAL_SYS_TYPE_OF = 0;
* <p>Create a score special.</p>
* @param i The id of the special.
public SpecialScore(int i) {
* <p>Logically evaluate a term in a list of goals for the first time.</p>
* <p>The term is passed via the skel and display of the engine.</p>
* <p>The continuation is passed via the r and u of the engine.</p>
* <p>The new continuation is returned via the skel and display of the engine.</p>
* @param en The engine.
* @return True if the predicate succeeded, otherwise false.
* @throws EngineMessage Shit happens.
public final boolean moniFirst(Engine en)
throws EngineMessage {
switch (id) {
Object[] temp = ((SkelCompound) en.skel).args;
Display ref = en.display;
Object m = SpecialUniv.derefAndCastRef(temp[0], ref);
if (!(m instanceof Class))
throw new EngineMessage(EngineMessage.domainError(
EngineMessage.OP_DOMAIN_CLASS, m));
Class clazz = (Class) m;
en.skel = temp[1];
en.display = ref;
if ((en.skel instanceof AbstractSkel || en.skel instanceof Number) ||
return false;
return true;
throw new IllegalArgumentException(AbstractSpecial.OP_ILLEGAL_SPECIAL);