Helfer SpecialLogic

Jan Burse, erstellt 04. Jan 2019
package jekpro.reference.runtime;
import jekpro.model.inter.AbstractSpecial;
import jekpro.model.inter.Engine;
import jekpro.model.molec.Display;
import jekpro.model.molec.DisplayClause;
import jekpro.model.molec.EngineException;
import jekpro.model.rope.Clause;
import jekpro.tools.term.SkelCompound;
/**
* <p>Provides built-in predicates for logic predicates.</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 SpecialLogic extends AbstractSpecial {
private final static int SPECIAL_SYS_LOCAL_CUT = 0;
private final static int SPECIAL_SYS_SOFT_LOCAL_CUT = 1;
private final static int SPECIAL_SYS_SAFE = 2;
/**
* <p>Create a logic special.</p>
*
* @param i The id of the special.
*/
public SpecialLogic(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_SYS_LOCAL_CUT:
DisplayClause u = en.contdisplay;
en.window = u;
en.fault = null;
en.cutChoices(u.number);
en.window = null;
if (en.fault != null)
throw en.fault;
return en.getNextRaw();
case SPECIAL_SYS_SOFT_LOCAL_CUT:
u = en.contdisplay;
if ((((u.flags & DisplayClause.MASK_DPCL_MORE) != 0) ?
u.number + 1 : u.number) >= en.number) {
en.window = u;
en.fault = null;
en.cutChoices(u.number);
en.window = null;
if (en.fault != null)
throw en.fault;
} else {
u.flags |= DisplayClause.MASK_DPCL_SOFT;
}
return en.getNextRaw();
case SPECIAL_SYS_SAFE:
Object[] temp = ((SkelCompound) en.skel).args;
Display ref = en.display;
en.skel = temp[0];
en.display = ref;
en.deref();
Clause clause = en.store.foyer.CLAUSE_CONT;
DisplayClause ref2 = new DisplayClause();
ref2.bind = DisplayClause.newBindClause(clause.dispsize);
ref2.addArgument(en.skel, en.display, en);
ref2.setEngine(en);
en.contskel = clause.getNextRaw(en);
en.contdisplay = ref2;
return true;
default:
throw new IllegalArgumentException(AbstractSpecial.OP_ILLEGAL_SPECIAL);
}
}
}

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