Helfer Clause

Jan Burse, erstellt 17. Aug 2019
package jekpro.model.rope;
import jekpro.frequent.experiment.InterfaceReference;
import jekpro.model.inter.AbstractDefined;
import jekpro.model.inter.Engine;
import jekpro.model.molec.EngineMessage;
import jekpro.model.pretty.AbstractSource;
import jekpro.tools.term.AbstractSkel;
import jekpro.tools.term.SkelVar;
import matula.util.data.MapHashLink;
/**
* <p>The class provides the clause intermediate code.</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 class Clause extends Directive implements InterfaceReference {
public final static int MASK_CLAUSE_ASSE = 0x00000010;
public Object head;
public int sizerule;
public int[] intargs;
public AbstractDefined del;
public MapHashLink<String, SkelVar> vars;
public int size;
/**
* <p>Create a clause.</p>
*
* @param copt The clause option flags.
*/
public Clause(int copt) {
super(copt);
}
/**
* <p>Create a clause.</p>
*
* @param copt The clause option flags.
* @param en The engine.
* @return The clause.
*/
public static Clause createClause(int copt, Engine en) {
if ((copt & AbstractDefined.MASK_DEFI_NIST) == 0) {
return en.store.foyer.createClause(copt);
} else {
return new Clause(copt);
}
}
/***********************************************************/
/* Convert To Intermediate */
/***********************************************************/
/**
* <p>Analyze a clause.</p>
*
* @param rule The rule.
* @param body The body.
*/
public void analyzeClause(Object rule, Object body) {
Optimization[] vars = Optimization.createHelper(rule);
if (vars.length != 0) {
Optimization.setHead(head, this, vars);
if (body != null)
Optimization.setBody(body, vars);
sizerule = Optimization.sortExtra(vars);
}
intargs = Optimization.unifyArgs(head, vars);
}
/**********************************************************/
/* InterfaceReference Protocol */
/**********************************************************/
/**
* <p>Assert this reference.</p>
*
* @param flags The flags.
* @param en The engine.
* @return True if the reference was asserted, otherwise false.
*/
public boolean assertRef(int flags, Engine en)
throws EngineMessage {
return del.assertClause(this, flags, en);
}
/**
* <p>Retract this reference.</p>
*
* @param en The engine.
* @return True if the reference was retracted, otherwise false.
* @throws EngineMessage Shit happens.
*/
public boolean retractRef(Engine en)
throws EngineMessage {
return del.retractClause(this, en);
}
/**
* <p>Clause this reference.</p>
* <p>The result is returned in the skeleton and display.</p>
*
* @param en The engine.
* @throws EngineMessage Shit happens.
*/
public void clauseRef(Engine en)
throws EngineMessage {
Object val = PreClause.interToClause(this, en);
en.skel = val;
en.display = AbstractSkel.createMarker(val);
}
/**************************************************************/
/* Accessibility Checks */
/**************************************************************/
/**
* <p>Check whether a source is inside the ancestors.</p>
*
* @param alfa The source.
* @param en The engine.
* @return True if the source is inside the ancestors, false otherwise.
*/
public static boolean ancestorSource(AbstractSource alfa, Engine en) {
return (alfa == null ||
en.store.ancestorStore(alfa.getStore()));
}
}

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