Source Code Cross Referenced for TwoSidedMatching.java in  » Testing » KeY » de » uka » ilkd » key » strategy » quantifierHeuristics » 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.quantifierHeuristics 
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:        //This file is part of KeY - Integrated Deductive Software Design
009:        //Copyright (C) 2001-2005 Universitaet Karlsruhe, Germany
010:        //                    Universitaet Koblenz-Landau, Germany
011:        //                    Chalmers University of Technology, Sweden
012:        //
013:        //The KeY system is protected by the GNU General Public License. 
014:        //See LICENSE.TXT for details.
015:        //
016:        //
017:
018:        package de.uka.ilkd.key.strategy.quantifierHeuristics;
019:
020:        import de.uka.ilkd.key.gui.Main;
021:        import de.uka.ilkd.key.logic.Constraint;
022:        import de.uka.ilkd.key.logic.Term;
023:        import de.uka.ilkd.key.logic.op.IUpdateOperator;
024:        import de.uka.ilkd.key.logic.op.IteratorOfQuantifiableVariable;
025:        import de.uka.ilkd.key.logic.op.MapAsListFromQuantifiableVariableToTerm;
026:        import de.uka.ilkd.key.logic.op.MapFromQuantifiableVariableToTerm;
027:        import de.uka.ilkd.key.logic.op.Metavariable;
028:        import de.uka.ilkd.key.logic.op.Modality;
029:        import de.uka.ilkd.key.logic.op.Operator;
030:        import de.uka.ilkd.key.logic.op.QuantifiableVariable;
031:
032:        /**
033:         * Matching triggers within another quantifier expression. Problems with the
034:         * current implementation:
035:         * 
036:         * * the usage of EqualityConstraint for unification implies that a variable is
037:         * never instantiated with non-rigid terms
038:         * 
039:         * * it is unclear whether certain instantiations are lost due to too strict type
040:         * checks in EqualityConstraint
041:         */
042:        class TwoSidedMatching {
043:
044:            private final UniTrigger trigger;
045:            private final Term triggerWithMVs;
046:            private final Substitution targetSubstWithMVs;
047:            private final Substitution triggerSubstWithMVs;
048:            private final Term targetWithMVs;
049:
050:            TwoSidedMatching(UniTrigger trigger, Term targetTerm) {
051:                this .trigger = trigger;
052:                this .targetSubstWithMVs = ReplacerOfQuanVariablesWithMetavariables
053:                        .createSubstitutionForVars(targetTerm);
054:                this .triggerSubstWithMVs = trigger.getTriggerSetThisBelongsTo()
055:                        .getReplacementWithMVs();
056:                this .targetWithMVs = targetSubstWithMVs.apply(TriggerUtils
057:                        .discardQuantifiers(targetTerm));
058:                this .triggerWithMVs = triggerSubstWithMVs.apply(trigger
059:                        .getTriggerTerm());
060:            }
061:
062:            SetOfSubstitution getSubstitutions() {
063:                return getAllsubstitutions(targetWithMVs);
064:            }
065:
066:            private SetOfSubstitution getAllsubstitutions(Term target) {
067:                SetOfSubstitution allsubs = SetAsListOfSubstitution.EMPTY_SET;
068:                Substitution sub = match(triggerWithMVs, target);
069:                if (sub != null
070:                        && (trigger.isElementOfMultitrigger() || sub
071:                                .isTotalOn(trigger.getUniVariables())
072:                        // sub.containFreevar(trigger.ts.allTerm.
073:                        // varsBoundHere(0).getQuantifiableVariable(0))
074:                        )) {
075:                    allsubs = allsubs.add(sub);
076:                }
077:                final Operator op = target.op();
078:                if (!(op instanceof  Modality || op instanceof  IUpdateOperator)) {
079:                    for (int i = 0; i < target.arity(); i++) {
080:                        allsubs = allsubs.union(getAllsubstitutions(target
081:                                .sub(i)));
082:                    }
083:                }
084:                return allsubs;
085:            }
086:
087:            /** find a substitution in a allterm by using unification */
088:            private Substitution match(Term triggerTerm, Term targetTerm) {
089:                final Constraint c = Constraint.BOTTOM.unify(targetTerm,
090:                        triggerTerm, Main.getInstance().mediator()
091:                                .getServices());
092:                if (c.isSatisfiable()) {
093:                    MapFromQuantifiableVariableToTerm sub = MapAsListFromQuantifiableVariableToTerm.EMPTY_MAP;
094:                    IteratorOfQuantifiableVariable it = trigger
095:                            .getUniVariables().iterator();
096:                    while (it.hasNext()) {
097:                        QuantifiableVariable q = it.next();
098:                        Term mv = triggerSubstWithMVs.getSubstitutedTerm(q);
099:                        Term t = c.getInstantiation((Metavariable) (mv.op()));
100:                        if (t == null || t.op() instanceof  Metavariable)
101:                            return null;
102:                        if (isGround(t))
103:                            sub = sub.put(q, t);
104:                    }
105:                    if (sub.size() > 0)
106:                        return new Substitution(sub);
107:                }
108:                return null;
109:            }
110:
111:            private boolean isGround(Term t) {
112:                return !triggerSubstWithMVs.termContainsValue(t)
113:                        && !targetSubstWithMVs.termContainsValue(t);
114:            }
115:        }
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