Helper ForeignSequence

Jan Burse, created Nov 10. 2019
package jekpro.frequent.advanced;
import jekpro.model.inter.Engine;
import jekpro.model.molec.Display;
import jekpro.model.molec.EngineMessage;
import jekpro.model.pretty.Foyer;
import jekpro.reference.structure.EngineLexical;
import jekpro.tools.call.CallOut;
import jekpro.tools.call.Interpreter;
import jekpro.tools.call.InterpreterMessage;
import jekpro.tools.term.AbstractSkel;
import jekpro.tools.term.AbstractTerm;
import jekpro.tools.term.SkelAtom;
import jekpro.tools.term.SkelCompound;
import matula.util.data.*;
/**
* <p>Provides built-in predicates for the module sequence.</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
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* 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 ForeignSequence {
/**
* <p>Set a pivot value.</p>
*
* @param inter The interpreter.
* @param pivot The pivot.
* @param val The value.
*/
public static void sysPivotSet(Interpreter inter, SetEntry pivot, Object val) {
Engine en = (Engine) inter.getEngine();
Display ref = AbstractTerm.getDisplay(val);
val = AbstractTerm.getSkel(val);
pivot.value = AbstractSkel.copySkel(val, ref, en);
}
/**
* <p>Retreve a pivot value.</p>
*
* @param pivot The pivot.
* @return The value.
*/
public static Object sysPivotGet(SetEntry pivot) {
Object val = pivot.value;
if (val == null)
return null;
Display ref = AbstractSkel.createMarker(val);
return AbstractTerm.createMolec(val, ref);
}
/**
* <p>Create a new variant comparator.</p>
*
* @param opt The sort options.
* @return The variant comparator.
* @throws InterpreterMessage Type Error.
*/
public static EngineLexical sysVariantComparator(Interpreter inter,
Object opt)
throws InterpreterMessage {
Engine engine = (Engine) inter.getEngine();
EngineLexical el = new EngineLexical();
try {
el.decodeSortOpts(AbstractTerm.getSkel(opt),
AbstractTerm.getDisplay(opt), engine);
} catch (EngineMessage x) {
throw new InterpreterMessage(x);
}
return el;
}
/**
* <p>Create a new revolve.</p>
*
* @return The revolve.
*/
public static AbstractMap sysRevolveNew() {
return new MapTree(AbstractSkel.DEFAULT);
}
/**
* <p>Create a new revolve.</p>
*
* @param el The variant comparator.
* @return The revolve.
*/
public static AbstractMap sysRevolveNew(EngineLexical el) {
if (el.getComparator() == null) {
return new MapHashLink();
} else {
return new MapTree(el);
}
}
/**
* <p>Place a copy into the revolve.</p>
*
* @param inter The interpreter.
* @param map The map.
* @param val The key.
*/
public static SetEntry sysRevolveLookup(Interpreter inter,
AbstractMap map, Object val) {
Engine en = (Engine) inter.getEngine();
Display d = AbstractTerm.getDisplay(val);
val = AbstractTerm.getSkel(val);
val = AbstractSkel.copySkel(val, d, en);
MapEntry h = map.getEntry(val);
if (h == null) {
h = map.newEntry(val, null);
map.putEntry(h);
}
return h;
}
/**
* <p>Enumerate the revolve.</p>
*
* @param co The call out.
* @param map The revolve.
* @return The pair.
*/
public static Object sysRevolvePair(CallOut co, AbstractMap map) {
MapEntry at;
if (co.getFirst()) {
at = map.getFirstEntry();
if (at == null)
return null;
} else {
at = (MapEntry) co.getData();
}
MapEntry next = map.successor(at);
co.setRetry(next != null);
co.setData(next);
Object val = new SkelCompound(new SkelAtom(Foyer.OP_SUB), at.key, at);
Display ref = AbstractSkel.createMarker(val);
return AbstractTerm.createMolec(val, ref);
}
}

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