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package hu.bme.mit.inf.dslreasoner.viatrasolver.logic2viatra.patterns
import hu.bme.mit.inf.dslreasoner.logic.model.logiclanguage.Relation
import hu.bme.mit.inf.dslreasoner.logic.model.logiclanguage.RelationDefinition
import hu.bme.mit.inf.dslreasoner.logic.model.logicproblem.LogicProblem
import hu.bme.mit.inf.dslreasoner.viatra2logic.viatra2logicannotations.TransfomedViatraQuery
import hu.bme.mit.inf.dslreasoner.viatrasolver.logic2viatra.Modality
import hu.bme.mit.inf.dslreasoner.viatrasolver.logic2viatra.PropagationModality
import java.util.Map
import org.eclipse.viatra.query.runtime.matchers.psystem.PConstraint
import org.eclipse.viatra.query.runtime.matchers.psystem.PVariable
import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.ExpressionEvaluation
import org.eclipse.viatra.query.runtime.matchers.psystem.queries.PQuery
import static extension hu.bme.mit.inf.dslreasoner.util.CollectionsUtil.*
import java.util.LinkedList
import java.util.List
import org.eclipse.xtend.lib.annotations.Data
import java.util.HashMap
import org.eclipse.viatra.query.runtime.matchers.psystem.basicenumerables.PositivePatternCall
import org.eclipse.viatra.query.runtime.matchers.psystem.basicdeferred.NegativePatternCall
import java.util.Comparator
import java.util.ArrayList
@Data class UnitPropagation {
val PQuery q
val PConstraint c
val PropagationModality pm
val Modality m3
}
@Data
class UnitPropagationPreconditionGenerationResult {
List<CharSequence> definitions= new LinkedList
Map<UnitPropagation,String> unitPropagation2PatternName = new HashMap
def registerQuery(PQuery q, PConstraint c, PropagationModality pm, Modality m3, String patternName, CharSequence definition) {
val key = new UnitPropagation(q,c,pm,m3)
definitions += definition
unitPropagation2PatternName.put(key,patternName)
}
def registerUnsatQuery(PQuery q, PConstraint c, PropagationModality pm, Modality m3) {
val key = new UnitPropagation(q,c,pm,m3)
unitPropagation2PatternName.put(key,null)
}
def contains(PQuery q, PConstraint c, PropagationModality pm, Modality m3) {
val key = new UnitPropagation(q,c,pm,m3)
return unitPropagation2PatternName.containsKey(key)
}
def getName(PQuery q, PConstraint c, PropagationModality pm, Modality m3) {
val key = new UnitPropagation(q,c,pm,m3)
return key.lookup(unitPropagation2PatternName)
}
def isDefined(PQuery q, PConstraint c, PropagationModality pm, Modality m3) {
val key = new UnitPropagation(q,c,pm,m3)
return unitPropagation2PatternName.get(key) !== null
}
}
class UnitPropagationPreconditionGenerator {
val PatternGenerator base
val PConstraintTransformer constraintTransformer;
new(PatternGenerator patternGenerator) {
this.base = patternGenerator
this.constraintTransformer = new PConstraintTransformer(base.relationDefinitionIndexer)
}
def generateUnitPropagationRules(
LogicProblem problem,
Iterable<RelationDefinition> relations,
Map<String,PQuery> fqn2PQuery)
{
// Create an empty result
val res = new UnitPropagationPreconditionGenerationResult
val wfs = base.wfQueries(problem)//.map[it.patternPQuery]
for(wf : wfs) {
val query = wf.patternPQuery as PQuery
val relation = wf.target
val allReferredChecks = query.allReferredConstraints.filter(ExpressionEvaluation)
for(referredCheck : allReferredChecks) {
generatePropagationRule(res,relation,query,referredCheck,PropagationModality::UP, Modality::MUST)
}
}
}
def allReferredConstraints(PQuery query) {
val allReferredQueries = query.allReferredQueries
return (#[query]+allReferredQueries).map[it.disjunctBodies.bodies].flatten.map[constraints].flatten
}
def getOrGeneratePropagationRule(UnitPropagationPreconditionGenerationResult res, Relation relation, PQuery q, PConstraint c, PropagationModality pm, Modality m3) {
if(!res.contains(q,c,pm,m3)) {
return res.getName(q,c,pm,m3)
} else {
res.generatePropagationRule(relation,q,c,pm,m3)
return res.getName(q,c,pm,m3)
}
}
def void generatePropagationRule(UnitPropagationPreconditionGenerationResult res, Relation relation, PQuery q, PConstraint c, PropagationModality pm, Modality m3) {
val name = relationDefinitionName(relation,q,c,pm,m3)
val constraintArity = c.arity
val generatedBodies = new LinkedList
for(body : q.disjunctBodies.bodies) {
if(body.constraints.contains(c)) {
if(pm === PropagationModality::UP) {
generatedBodies += '''
// Original Constraints
«FOR constraint : body.constraints.filter[it !== c]»
«this.constraintTransformer.transformConstraint(constraint,m3,relation.annotations.filter(TransfomedViatraQuery).head.variableTrace)»
«ENDFOR»
// Propagation for constraint
«this.constraintTransformer.transformConstraintUnset(c as ExpressionEvaluation,relation.annotations.filter(TransfomedViatraQuery).head.variableTrace)»
// Matching variables
«this.propagateVariables(c,pm)»
'''
}
// Otherwise, for PropagationModality::DOWN, the body cannot be satisfied
} else {
val positives = body.constraints.filter(PositivePatternCall)
val positiveRefers = positives.filter[it.referredQuery.allReferredConstraints.toSet.contains(c)]
for(positiveRefer: positiveRefers) {
val referredPQuery = positiveRefer.referredQuery
val referredRelation = (relation.eContainer as LogicProblem)
.annotations.filter(TransfomedViatraQuery).filter[it.patternPQuery === referredPQuery].head.target
val referredName = getOrGeneratePropagationRule(res,referredRelation,referredPQuery,c,pm,m3)
if(referredName !== null) {
generatedBodies += '''
// Original Constraints
«FOR constraint : body.constraints.filter[it !== positiveRefer]»
«this.constraintTransformer.transformConstraint(constraint,m3,relation.annotations.filter(TransfomedViatraQuery).head.variableTrace)»
«ENDFOR»
// Propagation for constraint referred indirectly from this pattern through «referredName»
find «referredName»(problem, interpretation,
«FOR index : 0..<referredPQuery.parameters.size SEPARATOR ", "»«positiveRefer.getVariableInTuple(index).canonizeName»«ENDFOR»,
«FOR index : 0..c.arity SEPARATOR ", "»«canonizeName(index,pm)»«ENDFOR»);
'''
}
// Otherwise, if the referred pattern is not satisfiable, this pattern is not satisfiable either
}
val negatives = body.constraints.filter(NegativePatternCall)
val negativeRefers = negatives.filter[it.referredQuery.allReferredConstraints.toSet.contains(c)]
for(negativeRefer : negativeRefers) {
val referredPQuery = negativeRefer.referredQuery
val referredRelation = (relation.eContainer as LogicProblem)
.annotations.filter(TransfomedViatraQuery).filter[it.patternPQuery === referredPQuery].head.target
val referredName = getOrGeneratePropagationRule(res,referredRelation,referredPQuery,c,pm,m3.dual)
if(referredName !== null) {
generatedBodies += '''
// Original Constraints
«FOR constraint : body.constraints.filter[it !== negativeRefer]»
«this.constraintTransformer.transformConstraint(constraint,m3,relation.annotations.filter(TransfomedViatraQuery).head.variableTrace)»
«ENDFOR»
// Propagation for constraint referred indirectly from this pattern through «referredName»
find «referredName»(problem, interpretation,
«FOR index : 0..<referredPQuery.parameters.size SEPARATOR ", "»«(negativeRefer.actualParametersTuple.get(index) as PVariable).canonizeName»«ENDFOR»,
«FOR index : 0..c.arity SEPARATOR ", "»«canonizeName(index,pm)»«ENDFOR»);
'''
} else {
generatedBodies += '''
// Original Constraints
«FOR constraint : body.constraints.filter[it !== negativeRefer]»
«this.constraintTransformer.transformConstraint(constraint,m3,relation.annotations.filter(TransfomedViatraQuery).head.variableTrace)»
«ENDFOR»
// Propagation for constraint referred indirectly from this pattern through «referredName»,
// which was unsatisfiable
'''
}
}
}
}
// Register the result
if(generatedBodies.size>=0) {
res.registerUnsatQuery(q,c,pm,m3)
} else {
val definition = '''
pattern «name»(
problem:LogicProblem, interpretation:PartialInterpretation,
«FOR param : q.parameters SEPARATOR ', '»var_«param.name»«ENDFOR»,
«FOR arity : 1..constraintArity SEPARATOR ', '»«canonizeName(arity,pm)»«ENDFOR»)
«FOR generatedBody: generatedBodies SEPARATOR "or"»{
«generatedBody»
}«ENDFOR»
'''
res.registerQuery(q,c,pm,m3,name,definition)
}
}
private def String relationDefinitionName(Relation relation, PQuery q, PConstraint c, PropagationModality pm, Modality m3)
'''«pm.name»«m3.name»Propagate_«base.canonizeName(relation.name)»'''
def canonizeName(PVariable v) {
return '''«IF v.referringConstraints.size == 1»_«ENDIF»var_«v.name.replaceAll("\\W","")»'''
}
def canonizeName(int index, PropagationModality m) {
return '''«m.name.toLowerCase»_«index»'''
}
def dispatch propagateVariables(ExpressionEvaluation c, PropagationModality m) {
val comparator = new Comparator<PVariable>(){
override compare(PVariable o1, PVariable o2) {
o1.name.compareTo(o2.name)
}
}
val variablesInOrder = new ArrayList(c.affectedVariables)
variablesInOrder.toList.sort(comparator)
return '''«FOR variableIndex : 1..variablesInOrder.size»«variablesInOrder.get(variableIndex-1).name»==«canonizeName(variableIndex,m)»;«ENDFOR»'''
}
def dispatch propagateVariables(PConstraint c, PropagationModality m) {
throw new UnsupportedOperationException('''Constraint not supported: «c.class.simpleName»''')
}
def dispatch arity(ExpressionEvaluation c) {
c.affectedVariables.size
}
def dispatch arity(PConstraint c) {
throw new UnsupportedOperationException('''Constraint not supported: «c.class.simpleName»''')
}
}
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