Helper ChoiceInspectMultifile

Jan Burse, created Jun 19. 2019
package jekpro.model.inter;
import jekpro.model.molec.*;
import jekpro.model.rope.Clause;
import jekpro.model.rope.Goal;
import jekpro.model.rope.Intermediate;
import jekpro.reference.runtime.SpecialQuali;
import jekpro.tools.term.SkelCompound;
import jekpro.tools.term.SkelVar;
/**
* <p>The class provides a choice point for multifile clause retrieval.</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.
*/
final class ChoiceInspectMultifile extends ChoiceInspect {
/**
* <p>Create an abstract choice inspect.</p>
*
* @param n The molec.
* @param a The position.
* @param c The clause list.
* @param f The flags.
* @param r The continuation skel.
* @param u The continuation display.
* @param d The new display.
* @param m The mark.
*/
ChoiceInspectMultifile(AbstractChoice n, int a,
Clause[] c, int f,
Intermediate r, CallFrame u,
Display d, AbstractUndo m) {
super(n, a, c, f, r, u, d, m);
}
/**
* <p>Logically evaluate a term in a list of goals for an additional time.</p>
* <p>The result is returned via the contskel and contdisplay of the engine.</p>
*
* @param en The engine.
* @return True if the predicate succeeded, otherwise false.
* @throws EngineException Shit happens.
* @throws EngineMessage Shit happens.
*/
public final boolean moniNext(Engine en)
throws EngineException, EngineMessage {
/* remove choice point */
en.choices = next;
en.number--;
/* end of cursor */
if (at == list.length)
return false;
/* undo bindings */
en.contskel = goalskel;
en.contdisplay = goaldisplay;
en.fault = null;
en.releaseBind(mark);
if (en.fault != null)
throw en.fault;
Intermediate ir = goalskel;
Object t = ((Goal) ir).term;
Display d = goaldisplay.disp;
if ((ir.flags & Goal.MASK_GOAL_NAKE) != 0) {
/* inlined deref */
BindUniv b1;
while (t instanceof SkelVar &&
(b1 = d.bind[((SkelVar) t).id]).display != null) {
t = b1.skel;
d = b1.display;
}
}
Object[] temp = ((SkelCompound) t).args;
/* detect term and body */
SpecialQuali.colonToCallable(temp[0], d, true, en);
Object head = en.skel;
Display refhead = en.display;
Clause clause;
boolean ext = refhead.getAndReset();
/* search rope */
for (; ; ) {
clause = list[at++];
newdisp.setSize(clause.size);
if (!(clause.head instanceof SkelCompound) ||
AbstractDefined.unifyArgs(((SkelCompound) head).args, refhead,
((SkelCompound) clause.head).args, newdisp, en)) {
Object end = clause.interToBody(en);
if (en.unifyTerm(temp[1], d, end, newdisp)) {
if ((flags & AbstractDefined.OPT_RSLT_CREF) != 0) {
if (en.unifyTerm(temp[2], d,
clause, Display.DISPLAY_CONST))
break;
} else {
break;
}
}
}
/* end of cursor */
for (; ; ) {
if (at == list.length)
return false;
if (AbstractDefinedMultifile.multiVisible(list[at], en))
break;
at++;
}
/* undo bindings */
en.fault = null;
en.releaseBind(mark);
if (en.fault != null)
throw en.fault;
}
newdisp.vars = clause.vars;
if (ext)
refhead.remTab(en);
if (clause.size != 0)
newdisp.remTab(en);
while (at != list.length) {
if (AbstractDefinedMultifile.multiVisible(list[at], en))
break;
at++;
}
if (at != list.length) {
/* reuse choice point */
en.choices = this;
en.number++;
} else {
/* */
}
/* succeed */
return true;
}
}

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