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/*******************************************************************************
* Copyright (c) 2009 Elliott Baron
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Elliott Baron - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.codan.extension;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.cdt.codan.extension.Minterm.Value;
import org.eclipse.cdt.core.dom.ast.IVariable;
public class ESSimplifier extends QuineMcCluskeySimplifier<IVariable> {
private Map<ExecutionState, Minterm<IVariable>> esMapping;
public ESSimplifier(ESTruthTable tt) {
super(tt);
esMapping = new HashMap<ExecutionState, Minterm<IVariable>>();
}
public Set<ExecutionState> getExecutionStateCover() {
Set<ExecutionState> ret = new HashSet<ExecutionState>();
List<Minterm<IVariable>> implicantCover = getImplicantCover();
for (Minterm<IVariable> term : implicantCover) {
ExecutionState es = new ExecutionState();
for (IVariable var : truthTable.getVariables()) {
Value val = term.getValue(var);
if (val == Value.TRUE) {
es.addClause(new ExecutionStateClause(var, true));
}
else if (val == Value.FALSE) {
es.addClause(new ExecutionStateClause(var, false));
}
// Don't care about Don't cares
}
// Add truth assignments from implied minterms
List<Minterm<IVariable>> implied = getImplications(term);
for (Minterm<IVariable> minterm : implied) {
ExecutionState e = ((ESTruthTable) truthTable).getExecutionState(minterm);
es.getTruthAssignments().putAll(e.getTruthAssignments());
}
ret.add(es);
esMapping.put(es, term);
}
return ret;
}
public Set<ExecutionState> getImplications(ExecutionState primeImplicant) {
Set<ExecutionState> ret = new HashSet<ExecutionState>();
Minterm<IVariable> piTerm = esMapping.get(primeImplicant);
List<Minterm<IVariable>> impls = getImplications(piTerm);
for (Minterm<IVariable> term : impls) {
ExecutionState es = ((ESTruthTable) truthTable).getExecutionState(term);
ret.add(es);
}
return ret;
}
@Override
public String toString() {
StringBuffer buf = new StringBuffer();
for (IVariable var : truthTable.getVariables()) {
buf.append(var.getName());
buf.append(" ");
}
buf.append("\n");
for (Minterm<IVariable> term : truthTable.getMinterms()) {
for (IVariable var : truthTable.getVariables()) {
switch (term.getValue(var)) {
case TRUE:
buf.append("1");
break;
case FALSE:
buf.append("0");
break;
default:
buf.append("-");
}
buf.append(" ");
}
buf.append("\n");
}
return buf.toString();
}
}
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