Helper SpecialCont

Jan Burse, created Jul 11. 2019
package jekmin.reference.experiment;
import jekpro.frequent.standard.ChoiceAtomic;
import jekpro.frequent.standard.SpecialFind;
import jekpro.frequent.standard.SpecialSignal;
import jekpro.model.inter.AbstractSpecial;
import jekpro.model.inter.Engine;
import jekpro.model.inter.Supervisor;
import jekpro.model.molec.BindUniv;
import jekpro.model.molec.Display;
import jekpro.model.molec.EngineException;
import jekpro.tools.term.AbstractTerm;
import jekpro.tools.term.SkelCompound;
import jekpro.tools.term.TermVar;
import matula.util.data.AbstractMap;
import matula.util.data.ListArray;
import matula.util.data.MapEntry;
/**
* <p>Provides built-ins for the module experiment/cont.</p>
* <p/>
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
* <p/>
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
* <p/>
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
* <p/>
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
* <p/>
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
public final class SpecialCont extends AbstractSpecial {
private final static int SPECIAL_CONT_PUSH = 0;
private final static int SPECIAL_CONT_POP = 1;
private final static int SPECIAL_SYS_RIPPLE = 2;
/**
* <p>Create a suspension queue special.</p>
*
* @param i The id.
*/
public SpecialCont(int i) {
super(i);
}
/**
* <p>Logically evaluate a goal in a list of goals for the first time.</p>
* <p>The goal 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 EngineException Shit happens.
*/
public final boolean moniFirst(Engine en)
throws EngineException {
switch (id) {
case SPECIAL_CONT_PUSH:
Object[] temp = ((SkelCompound) en.skel).args;
Display ref = en.display;
en.skel = temp[0];
en.display = ref;
en.deref();
BindUniv bv = new BindUniv();
bv.bindUniv(en.skel, en.display, en);
SpecialCont.pushCont(bv, en);
return true;
case SPECIAL_CONT_POP:
SpecialCont.popCont(en);
return true;
case SPECIAL_SYS_RIPPLE:
temp = ((SkelCompound) en.skel).args;
ref = en.display;
en.skel = temp[0];
en.display = ref;
en.deref();
if (!SpecialSignal.invokeAtomic(en, ChoiceAtomic.MASK_FLAGS_VRFY))
return false;
return true;
default:
throw new IllegalArgumentException(OP_ILLEGAL_SPECIAL);
}
}
/**********************************************************/
/* Push/Pop Cont */
/**********************************************************/
/**
* <p>Push a goal on the suspension queue.</p>
*
* @param bv The bind var.
* @param en The engine.
*/
private static void pushCont(BindUniv bv, Engine en) {
Supervisor visor = en.visor;
if (visor.cont == null)
visor.cont = new ListArray<BindUniv>();
visor.cont.add(bv);
}
/**
* <p>Pop a goal from the suspension queue.</p>
*
* @param en The engine.
*/
private static void popCont(Engine en) {
Supervisor visor = en.visor;
visor.cont.remove(visor.cont.size() - 1);
if (visor.cont.size() == 0)
visor.cont = null;
}
}

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