1 #include "satencoder.h"
5 #include "constraint.h"
9 #include "tableentry.h"
12 #include "predicate.h"
15 SATEncoder::SATEncoder(CSolver *_solver) :
20 SATEncoder::~SATEncoder() {
24 int SATEncoder::solve() {
28 void SATEncoder::encodeAllSATEncoder(CSolver *csolver) {
29 SetIteratorBooleanEdge *iterator = csolver->getConstraints();
30 while (iterator->hasNext()) {
31 BooleanEdge constraint = iterator->next();
32 constraint.getBoolean()->print();
33 Edge c = encodeConstraintSATEncoder(constraint);
34 addConstraintCNF(cnf, c);
39 Edge SATEncoder::encodeConstraintSATEncoder(BooleanEdge c) {
41 Boolean * constraint = c.getBoolean();
43 if (booledgeMap.contains(constraint)) {
44 Edge e = {(Node *) booledgeMap.get(constraint)};
45 return c.isNegated() ? constraintNegate(e) : e;
48 switch (constraint->type) {
50 result = encodeOrderSATEncoder((BooleanOrder *) constraint);
53 result = encodeVarSATEncoder((BooleanVar *) constraint);
56 result = encodeLogicSATEncoder((BooleanLogic *) constraint);
59 result = encodePredicateSATEncoder((BooleanPredicate *) constraint);
62 model_print("Unhandled case in encodeConstraintSATEncoder %u", constraint->type);
65 booledgeMap.put(constraint, result.node_ptr);
66 return c.isNegated() ? constraintNegate(result) : result;
69 void SATEncoder::getArrayNewVarsSATEncoder(uint num, Edge *carray) {
70 for (uint i = 0; i < num; i++)
71 carray[i] = getNewVarSATEncoder();
74 Edge SATEncoder::getNewVarSATEncoder() {
75 return constraintNewVar(cnf);
78 Edge SATEncoder::encodeVarSATEncoder(BooleanVar *constraint) {
79 if (edgeIsNull(constraint->var)) {
80 constraint->var = getNewVarSATEncoder();
82 return constraint->var;
85 Edge SATEncoder::encodeLogicSATEncoder(BooleanLogic *constraint) {
86 Edge array[constraint->inputs.getSize()];
87 for (uint i = 0; i < constraint->inputs.getSize(); i++)
88 array[i] = encodeConstraintSATEncoder(constraint->inputs.get(i));
90 switch (constraint->op) {
92 return constraintAND(cnf, constraint->inputs.getSize(), array);
94 return constraintNegate(array[0]);
96 return constraintIFF(cnf, array[0], array[1]);
100 //Don't handle, translate these away...
102 model_print("Unhandled case in encodeLogicSATEncoder %u", constraint->op);
107 Edge SATEncoder::encodePredicateSATEncoder(BooleanPredicate *constraint) {
108 switch (constraint->predicate->type) {
110 return encodeTablePredicateSATEncoder(constraint);
112 return encodeOperatorPredicateSATEncoder(constraint);
119 Edge SATEncoder::encodeTablePredicateSATEncoder(BooleanPredicate *constraint) {
120 switch (constraint->encoding.type) {
121 case ENUMERATEIMPLICATIONS:
122 case ENUMERATEIMPLICATIONSNEGATE:
123 return encodeEnumTablePredicateSATEncoder(constraint);
133 void SATEncoder::encodeElementSATEncoder(Element *element) {
134 /* Check to see if we have already encoded this element. */
135 if (element->getElementEncoding()->variables != NULL)
138 /* Need to encode. */
139 switch ( element->type) {
141 generateElementEncoding(element);
142 encodeElementFunctionSATEncoder((ElementFunction *) element);
145 generateElementEncoding(element);
154 void SATEncoder::encodeElementFunctionSATEncoder(ElementFunction *function) {
155 switch (function->getFunction()->type) {
157 encodeTableElementFunctionSATEncoder(function);
160 encodeOperatorElementFunctionSATEncoder(function);
167 void SATEncoder::encodeTableElementFunctionSATEncoder(ElementFunction *function) {
168 switch (function->getElementFunctionEncoding()->type) {
169 case ENUMERATEIMPLICATIONS:
170 encodeEnumTableElemFunctionSATEncoder(function);