Source Code Cross Referenced for AbstractFeatureStrategy.java in  » Testing » KeY » de » uka » ilkd » key » strategy » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » KeY » de.uka.ilkd.key.strategy 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // This file is part of KeY - Integrated Deductive Software Design
002:        // Copyright (C) 2001-2007 Universitaet Karlsruhe, Germany
003:        //                         Universitaet Koblenz-Landau, Germany
004:        //                         Chalmers University of Technology, Sweden
005:        //
006:        // The KeY system is protected by the GNU General Public License. 
007:        // See LICENSE.TXT for details.
008:        //
009:        //
010:
011:        package de.uka.ilkd.key.strategy;
012:
013:        import de.uka.ilkd.key.logic.*;
014:        import de.uka.ilkd.key.logic.op.Operator;
015:        import de.uka.ilkd.key.logic.sort.Sort;
016:        import de.uka.ilkd.key.proof.Goal;
017:        import de.uka.ilkd.key.proof.IHTacletFilter;
018:        import de.uka.ilkd.key.proof.Proof;
019:        import de.uka.ilkd.key.proof.TacletFilter;
020:        import de.uka.ilkd.key.proof.UpdateSimplificationRuleFilter;
021:        import de.uka.ilkd.key.rule.ListOfRuleSet;
022:        import de.uka.ilkd.key.rule.RuleApp;
023:        import de.uka.ilkd.key.rule.RuleSet;
024:        import de.uka.ilkd.key.rule.SLListOfRuleSet;
025:        import de.uka.ilkd.key.strategy.feature.*;
026:        import de.uka.ilkd.key.strategy.feature.instantiator.*;
027:        import de.uka.ilkd.key.strategy.termProjection.*;
028:        import de.uka.ilkd.key.strategy.termfeature.*;
029:        import de.uka.ilkd.key.strategy.termgenerator.TermGenerator;
030:
031:        /**
032:         *
033:         */
034:        public abstract class AbstractFeatureStrategy implements  Strategy {
035:
036:            private final Proof proof;
037:
038:            protected AbstractFeatureStrategy(Proof proof) {
039:                this .proof = proof;
040:            }
041:
042:            /**
043:             * @return Returns the proof.
044:             */
045:            protected Proof getProof() {
046:                return proof;
047:            }
048:
049:            /**
050:             * @param heuristics
051:             * @param thenFeature
052:             * @return
053:             */
054:            protected Feature ifHeuristics(String[] heuristics,
055:                    Feature thenFeature) {
056:                return ConditionalFeature.createConditional(
057:                        getFilterFor(heuristics), thenFeature);
058:            }
059:
060:            /**
061:             * @param heuristics
062:             * @param thenFeature
063:             * @param elseFeature
064:             * @return
065:             */
066:            protected Feature ifHeuristics(String[] heuristics,
067:                    Feature thenFeature, Feature elseFeature) {
068:                return ConditionalFeature.createConditional(
069:                        getFilterFor(heuristics), thenFeature, elseFeature);
070:            }
071:
072:            protected Feature longConst(long a) {
073:                return ConstFeature.createConst(c(a));
074:            }
075:
076:            protected Feature inftyConst() {
077:                return ConstFeature.createConst(infty());
078:            }
079:
080:            protected TermFeature any() {
081:                return longTermConst(0);
082:            }
083:
084:            protected TermFeature longTermConst(long a) {
085:                return ConstTermFeature.createConst(c(a));
086:            }
087:
088:            protected TermFeature inftyTermConst() {
089:                return ConstTermFeature.createConst(infty());
090:            }
091:
092:            protected Feature add(Feature a, Feature b) {
093:                return BinarySumFeature.createSum(a, b);
094:            }
095:
096:            protected Feature add(Feature a, Feature b, Feature c) {
097:                return TernarySumFeature.createSum(a, b, c);
098:            }
099:
100:            protected TermFeature add(TermFeature a, TermFeature b) {
101:                return BinarySumTermFeature.createSum(a, b);
102:            }
103:
104:            protected TermFeature add(TermFeature a, TermFeature b,
105:                    TermFeature c) {
106:                // could be done more efficiently
107:                return add(a, add(b, c));
108:            }
109:
110:            protected TermFeature or(TermFeature a, TermFeature b) {
111:                return ifZero(a, longTermConst(0), b);
112:            }
113:
114:            protected TermFeature or(TermFeature a, TermFeature b, TermFeature c) {
115:                return or(a, or(b, c));
116:            }
117:
118:            protected Feature or(Feature a, Feature b) {
119:                return ifZero(a, longConst(0), b);
120:            }
121:
122:            protected Feature or(Feature a, Feature b, Feature c) {
123:                return or(a, or(b, c));
124:            }
125:
126:            protected Feature ifZero(Feature cond, Feature thenFeature) {
127:                return ShannonFeature
128:                        .createConditionalBinary(cond, thenFeature);
129:            }
130:
131:            protected Feature ifZero(Feature cond, Feature thenFeature,
132:                    Feature elseFeature) {
133:                return ShannonFeature.createConditionalBinary(cond,
134:                        thenFeature, elseFeature);
135:            }
136:
137:            protected TermFeature ifZero(TermFeature cond,
138:                    TermFeature thenFeature) {
139:                return ShannonTermFeature.createConditionalBinary(cond,
140:                        thenFeature);
141:            }
142:
143:            protected TermFeature ifZero(TermFeature cond,
144:                    TermFeature thenFeature, TermFeature elseFeature) {
145:                return ShannonTermFeature.createConditionalBinary(cond,
146:                        thenFeature, elseFeature);
147:            }
148:
149:            protected Feature not(Feature f) {
150:                return ifZero(f, inftyConst(), longConst(0));
151:            }
152:
153:            protected TermFeature not(TermFeature f) {
154:                return ifZero(f, ConstTermFeature
155:                        .createConst(TopRuleAppCost.INSTANCE), longTermConst(0));
156:            }
157:
158:            protected Feature eq(Feature a, Feature b) {
159:                return CompareCostsFeature.eq(a, b);
160:            }
161:
162:            protected Feature less(Feature a, Feature b) {
163:                return CompareCostsFeature.less(a, b);
164:            }
165:
166:            protected Feature leq(Feature a, Feature b) {
167:                return CompareCostsFeature.leq(a, b);
168:            }
169:
170:            /**
171:             * @param names
172:             * @param priority
173:             * @return
174:             */
175:            protected Feature ifHeuristics(String[] names, int priority) {
176:                return ConditionalFeature.createConditional(
177:                        getFilterFor(names), c(priority), c(0));
178:            }
179:
180:            /**
181:             * @param priority
182:             * @return
183:             */
184:            protected Feature selectSimplifier(long priority) {
185:                return ConditionalFeature.createConditional(
186:                        UpdateSimplificationRuleFilter.INSTANCE,
187:                        longConst(priority));
188:            }
189:
190:            private RuleAppCost c(long p) {
191:                return LongRuleAppCost.create(p);
192:            }
193:
194:            private RuleAppCost infty() {
195:                return TopRuleAppCost.INSTANCE;
196:            }
197:
198:            protected TacletFilter getFilterFor(String[] p_names) {
199:                ListOfRuleSet heur = SLListOfRuleSet.EMPTY_LIST;
200:                for (int i = 0; i != p_names.length; ++i)
201:                    heur = heur.prepend(getHeuristic(p_names[i]));
202:                return new IHTacletFilter(false, heur);
203:            }
204:
205:            protected RuleSet getHeuristic(String p_name) {
206:                final NamespaceSet nss = getProof().getNamespaces();
207:
208:                assert nss != null : "Rule set namespace not available.";
209:
210:                final Namespace ns = nss.ruleSets();
211:                final Named h = ns.lookup(new Name(p_name));
212:
213:                assert h != null : "Did not find the rule set " + p_name;
214:
215:                return (RuleSet) h;
216:            }
217:
218:            protected void bindRuleSet(RuleSetDispatchFeature d,
219:                    RuleSet ruleSet, Feature f) {
220:                d.add(ruleSet, f);
221:            }
222:
223:            protected void bindRuleSet(RuleSetDispatchFeature d,
224:                    RuleSet ruleSet, long cost) {
225:                bindRuleSet(d, ruleSet, longConst(cost));
226:            }
227:
228:            protected void bindRuleSet(RuleSetDispatchFeature d,
229:                    String ruleSet, Feature f) {
230:                bindRuleSet(d, getHeuristic(ruleSet), f);
231:            }
232:
233:            protected void bindRuleSet(RuleSetDispatchFeature d,
234:                    String ruleSet, long cost) {
235:                bindRuleSet(d, getHeuristic(ruleSet), longConst(cost));
236:            }
237:
238:            protected void clearRuleSetBindings(RuleSetDispatchFeature d,
239:                    RuleSet ruleSet) {
240:                d.clear(ruleSet);
241:            }
242:
243:            protected void clearRuleSetBindings(RuleSetDispatchFeature d,
244:                    String ruleSet) {
245:                d.clear(getHeuristic(ruleSet));
246:            }
247:
248:            /**
249:             * Create a projection of taclet applications to the instantiation of the
250:             * schema variables <code>schemaVar</code>. If <code>schemaVar</code>
251:             * is not instantiated for a particular taclet app, an error will be raised
252:             */
253:            protected ProjectionToTerm instOf(String schemaVar) {
254:                return SVInstantiationProjection.create(new Name(schemaVar),
255:                        true);
256:            }
257:
258:            /**
259:             * Create a projection of taclet applications to the instantiation of the
260:             * schema variables <code>schemaVar</code>. The projection will be
261:             * partial and undefined for those taclet applications that do not
262:             * instantiate <code>schemaVar</code>
263:             */
264:            protected ProjectionToTerm instOfNonStrict(String schemaVar) {
265:                return SVInstantiationProjection.create(new Name(schemaVar),
266:                        false);
267:            }
268:
269:            protected ProjectionToTerm subAt(ProjectionToTerm t, PosInTerm pit) {
270:                return SubtermProjection.create(t, pit);
271:            }
272:
273:            protected ProjectionToTerm sub(ProjectionToTerm t, int index) {
274:                return SubtermProjection.create(t, PosInTerm.TOP_LEVEL
275:                        .down(index));
276:            }
277:
278:            protected ProjectionToTerm opTerm(Operator op,
279:                    ProjectionToTerm[] subTerms) {
280:                return TermConstructionProjection.create(op, subTerms);
281:            }
282:
283:            protected ProjectionToTerm opTerm(Operator op,
284:                    ProjectionToTerm subTerm) {
285:                return opTerm(op, new ProjectionToTerm[] { subTerm });
286:            }
287:
288:            protected ProjectionToTerm opTerm(Operator op,
289:                    ProjectionToTerm subTerm0, ProjectionToTerm subTerm1) {
290:                return opTerm(op, new ProjectionToTerm[] { subTerm0, subTerm1 });
291:            }
292:
293:            protected Feature isInstantiated(String schemaVar) {
294:                return InstantiatedSVFeature.create(new Name(schemaVar));
295:            }
296:
297:            protected TermFeature op(Operator op) {
298:                return OperatorTF.create(op);
299:            }
300:
301:            protected TermFeature rec(TermFeature cond, TermFeature summand) {
302:                return RecSubTermFeature.create(cond, summand);
303:            }
304:
305:            protected TermFeature sub(TermFeature sub0) {
306:                return SubTermFeature.create(new TermFeature[] { sub0 });
307:            }
308:
309:            protected TermFeature sub(TermFeature sub0, TermFeature sub1) {
310:                return SubTermFeature.create(new TermFeature[] { sub0, sub1 });
311:            }
312:
313:            protected TermFeature opSub(Operator op, TermFeature sub0) {
314:                return add(op(op), sub(sub0));
315:            }
316:
317:            protected TermFeature opSub(Operator op, TermFeature sub0,
318:                    TermFeature sub1) {
319:                return add(op(op), sub(sub0, sub1));
320:            }
321:
322:            protected TermFeature eq(TermBuffer t) {
323:                return EqTermFeature.create(t);
324:            }
325:
326:            protected Feature eq(ProjectionToTerm t1, ProjectionToTerm t2) {
327:                final TermBuffer buf = new TermBuffer();
328:                return let(buf, t1, applyTF(t2, eq(buf)));
329:            }
330:
331:            protected Feature contains(ProjectionToTerm bigTerm,
332:                    ProjectionToTerm searchedTerm) {
333:                final TermBuffer buf = new TermBuffer();
334:                return let(buf, searchedTerm, applyTF(bigTerm, not(rec(any(),
335:                        not(eq(buf))))));
336:            }
337:
338:            protected Feature println(ProjectionToTerm t) {
339:                return applyTF(t, PrintTermFeature.INSTANCE);
340:            }
341:
342:            protected TermFeature extendsTrans(Sort s) {
343:                return SortExtendsTransTermFeature.create(s);
344:            }
345:
346:            /**
347:             * Invoke the term feature <code>tf</code> on the term that instantiation
348:             * of <code>schemaVar</code>. This is the strict/safe version that raises an
349:             * error of <code>schemaVar</code> is not instantiated for a particular
350:             * taclet app
351:             */
352:            protected Feature applyTF(String schemaVar, TermFeature tf) {
353:                return applyTF(instOf(schemaVar), tf);
354:            }
355:
356:            /**
357:             * Invoke the term feature <code>tf</code> on the term that instantiation
358:             * of <code>schemaVar</code>. This is the non-strict/unsafe version that
359:             * simply returns zero if <code>schemaVar</code> is not instantiated for a
360:             * particular taclet app
361:             */
362:            protected Feature applyTFNonStrict(String schemaVar, TermFeature tf) {
363:                return applyTFNonStrict(instOfNonStrict(schemaVar), tf);
364:            }
365:
366:            /**
367:             * Evaluate the term feature <code>tf</code> for the term described by the
368:             * projection <code>term</code>. If <code>term</code> is undefined for
369:             * a particular rule app, an exception is raised
370:             */
371:            protected Feature applyTF(ProjectionToTerm term, TermFeature tf) {
372:                return ApplyTFFeature.create(term, tf);
373:            }
374:
375:            /**
376:             * Evaluate the term feature <code>tf</code> for the term described by the
377:             * projection <code>term</code>. If <code>term</code> is undefined for
378:             * a particular rule app, zero is returned
379:             */
380:            protected Feature applyTFNonStrict(ProjectionToTerm term,
381:                    TermFeature tf) {
382:                return ApplyTFFeature.createNonStrict(term, tf,
383:                        LongRuleAppCost.ZERO_COST);
384:            }
385:
386:            private final BackTrackingManager btManager = new BackTrackingManager();
387:
388:            protected BackTrackingManager getBtManager() {
389:                return btManager;
390:            }
391:
392:            public final void instantiateApp(RuleApp app, PosInOccurrence pio,
393:                    Goal goal, RuleAppCostCollector collector) {
394:                getBtManager().setup(app);
395:                do {
396:                    final RuleAppCost cost = instantiateApp(app, pio, goal);
397:                    if (cost instanceof  TopRuleAppCost)
398:                        continue;
399:                    final RuleApp res = getBtManager().getResultingapp();
400:                    if (res == app || res == null)
401:                        continue;
402:                    collector.collect(res, cost);
403:                } while (getBtManager().backtrack());
404:            }
405:
406:            protected abstract RuleAppCost instantiateApp(RuleApp app,
407:                    PosInOccurrence pio, Goal goal);
408:
409:            protected Feature forEach(TermBuffer x, TermGenerator gen,
410:                    Feature body) {
411:                return ForEachCP.create(x, gen, body, getBtManager());
412:            }
413:
414:            protected Feature oneOf(Feature[] features) {
415:                return OneOfCP.create(features, getBtManager());
416:            }
417:
418:            protected Feature oneOf(Feature feature0, Feature feature1) {
419:                return oneOf(new Feature[] { feature0, feature1 });
420:            }
421:
422:            protected Feature sum(TermBuffer x, TermGenerator gen, Feature body) {
423:                return ComprehendedSumFeature.create(x, gen, body);
424:            }
425:
426:            // it is possible to turn off the method <code>instantiate</code>,
427:            // which can be useful in order to use the same feature definitions both for
428:            // cost computation and instantiation
429:
430:            private boolean instantiateActive = false;
431:
432:            protected void enableInstantiate() {
433:                instantiateActive = true;
434:            }
435:
436:            protected void disableInstantiate() {
437:                instantiateActive = false;
438:            }
439:
440:            protected Feature instantiate(Name sv, ProjectionToTerm value) {
441:                if (instantiateActive)
442:                    return SVInstantiationCP.create(sv, value, getBtManager());
443:                else
444:                    return longConst(0);
445:            }
446:
447:            protected Feature let(TermBuffer x, ProjectionToTerm value,
448:                    Feature body) {
449:                return LetFeature.create(x, value, body);
450:            }
451:
452:            protected Feature instantiate(String sv, ProjectionToTerm value) {
453:                return instantiate(new Name(sv), value);
454:            }
455:
456:            protected Feature isSubSortFeature(ProjectionToTerm s1,
457:                    ProjectionToTerm s2) {
458:                return SortComparisionFeature.create(s1, s2,
459:                        SortComparisionFeature.SUBSORT);
460:            }
461:
462:            protected Feature implicitCastNecessary(ProjectionToTerm s1) {
463:                return ImplicitCastNecessary.create(s1);
464:            }
465:
466:        }
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