com.sri.ai.grinder.sgdpllt.interpreter.BruteForceMultiIndexQuantifierEliminator Maven / Gradle / Ivy
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* Copyright (c) 2013, SRI International
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package com.sri.ai.grinder.sgdpllt.interpreter;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.google.common.annotations.Beta;
import com.sri.ai.expresso.api.Expression;
import com.sri.ai.grinder.helper.AssignmentsIterator;
import com.sri.ai.grinder.sgdpllt.api.Context;
import com.sri.ai.grinder.sgdpllt.core.solver.AbstractMultiIndexQuantifierEliminator;
import com.sri.ai.grinder.sgdpllt.group.AssociativeCommutativeGroup;
import com.sri.ai.grinder.sgdpllt.library.controlflow.IfThenElse;
import com.sri.ai.grinder.sgdpllt.rewriter.api.TopRewriter;
/**
* An extension of {@link AbstractMultiIndexQuantifierEliminator}
* that solves quantified expressions by brute force.
*
* Additionally, it takes an assignment to symbols as a constructing parameter,
* and throws an error when a symbol with unassigned value is found.
*
* The reason this quantifier eliminator uses an assignment to keep a binding to variables,
* as opposed to using equalities in the context, is that
* the context can only deal with variables for which we have a satisfiability solver,
* whereas an assignment can be used for any variables.
*
* @author braz
*
*/
@Beta
public class BruteForceMultiIndexQuantifierEliminator extends AbstractIterativeMultiIndexQuantifierEliminator {
public BruteForceMultiIndexQuantifierEliminator(TopRewriter topRewriter) {
super(topRewriter);
}
public BruteForceMultiIndexQuantifierEliminator(TopRewriterUsingContextAssignments topRewriterWithBaseAssignment) {
super(topRewriterWithBaseAssignment);
}
@Override
public Iterator> makeAssignmentsIterator(List indices, Expression indicesCondition, Context context) {
return new AssignmentsIterator(indices, context);
}
@Override
public Expression makeSummand(AssociativeCommutativeGroup group, List indices, Expression indicesCondition, Expression body, Context context) {
return IfThenElse.make(indicesCondition, body, group.additiveIdentityElement());
}
}