src/Backend/satencoder.c

   1 #include "satencoder.h"
   2 #include "structs.h"
   3 #include "csolver.h"
   4 #include "boolean.h"
   5 #include "constraint.h"
   6 #include "common.h"
   7
   8 SATEncoder * allocSATEncoder() {
   9         SATEncoder *This=ourmalloc(sizeof (SATEncoder));
  10         This->varcount=1;
  11         return This;
  12 }
  13
  14 void deleteSATEncoder(SATEncoder *This) {
  15         ourfree(This);
  16 }
  17
  18 void encodeAllSATEncoder(SATEncoder * This, CSolver *csolver) {
  19         VectorBoolean *constraints=csolver->constraints;
  20         uint size=getSizeVectorBoolean(constraints);
  21         for(uint i=0;i<size;i++) {
  22                 Boolean *constraint=getVectorBoolean(constraints, i);
  23                 encodeConstraintSATEncoder(This, constraint);
  24         }
  25 }
  26
  27 Constraint * encodeConstraintSATEncoder(SATEncoder *This, Boolean *constraint) {
  28         switch(GETBOOLEANTYPE(constraint)) {
  29         case ORDERCONST:
  30                 return encodeOrderSATEncoder(This, (BooleanOrder *) constraint);
  31         case BOOLEANVAR:
  32                 return encodeVarSATEncoder(This, (BooleanVar *) constraint);
  33         case LOGICOP:
  34                 return encodeLogicSATEncoder(This, (BooleanLogic *) constraint);
  35         default:
  36                 model_print("Unhandled case in encodeConstraintSATEncoder %u", GETBOOLEANTYPE(constraint));
  37                 exit(-1);
  38         }
  39 }
  40
  41 Constraint * encodeOrderSATEncoder(SATEncoder *This, BooleanOrder * constraint) {
  42         return NULL;
  43 }
  44
  45 Constraint * getNewVarSATEncoder(SATEncoder *This) {
  46         Constraint * var=allocVarConstraint(VAR, This->varcount);
  47         Constraint * varneg=allocVarConstraint(NOTVAR, This->varcount++);
  48         setNegConstraint(var, varneg);
  49         setNegConstraint(varneg, var);
  50         return var;
  51 }
  52
  53 Constraint * encodeVarSATEncoder(SATEncoder *This, BooleanVar * constraint) {
  54         if (constraint->var == NULL) {
  55                 constraint->var=getNewVarSATEncoder(This);
  56         }
  57         return constraint->var;
  58 }
  59
  60 Constraint * encodeLogicSATEncoder(SATEncoder *This, BooleanLogic * constraint) {
  61         Constraint * array[constraint->numArray];
  62         for(uint i=0;i<constraint->numArray;i++)
  63                 array[i]=encodeConstraintSATEncoder(This, constraint->array[i]);
  64
  65         switch(constraint->op) {
  66         case L_AND:
  67                 return allocArrayConstraint(AND, constraint->numArray, array);
  68         case L_OR:
  69                 return allocArrayConstraint(OR, constraint->numArray, array);
  70         case L_NOT:
  71                 return negateConstraint(allocConstraint(OR, array[0], NULL));
  72         case L_XOR: {
  73                 Constraint * nleft=negateConstraint(cloneConstraint(array[0]));
  74                 Constraint * nright=negateConstraint(cloneConstraint(array[1]));
  75                 return allocConstraint(OR,
  76                                                                                                          allocConstraint(AND, array[0], nright),
  77                                                                                                          allocConstraint(AND, nleft, array[1]));
  78         }
  79         case L_IMPLIES:
  80                 return allocConstraint(IMPLIES, array[0], array[1]);
  81         default:
  82                 model_print("Unhandled case in encodeLogicSATEncoder %u", constraint->op);
  83                 exit(-1);
  84         }
  85 }