private static int isArrayInitializer()

in src/org/jetbrains/java/decompiler/modules/decompiler/SimplifyExprentsHelper.java [257:339]
66 lines of code
30 McCabe index (conditional complexity)

  private static int isArrayInitializer(List<Exprent> list, int index) {
    Exprent current = list.get(index);
    if (current.type == Exprent.EXPRENT_ASSIGNMENT) {
      AssignmentExprent as = (AssignmentExprent)current;

      if (as.getRight().type == Exprent.EXPRENT_NEW && as.getLeft().type == Exprent.EXPRENT_VAR) {
        NewExprent newExpr = (NewExprent)as.getRight();

        if (newExpr.getExprType().getArrayDim() > 0 && newExpr.getLstDims().size() == 1 && newExpr.getLstArrayElements().isEmpty() &&
            newExpr.getLstDims().get(0).type == Exprent.EXPRENT_CONST) {

          int size = (Integer)((ConstExprent)newExpr.getLstDims().get(0)).getValue();
          if (size == 0) {
            return 0;
          }

          VarExprent arrVar = (VarExprent)as.getLeft();
          Map<Integer, Exprent> mapInit = new HashMap<>();

          int i = 1;
          while (index + i < list.size() && i <= size) {
            boolean found = false;

            Exprent expr = list.get(index + i);
            if (expr.type == Exprent.EXPRENT_ASSIGNMENT) {
              AssignmentExprent aas = (AssignmentExprent)expr;
              if (aas.getLeft().type == Exprent.EXPRENT_ARRAY) {
                ArrayExprent arrExpr = (ArrayExprent)aas.getLeft();
                if (arrExpr.getArray().type == Exprent.EXPRENT_VAR && arrVar.equals(arrExpr.getArray()) &&
                    arrExpr.getIndex().type == Exprent.EXPRENT_CONST) {
                  // TODO: check for a number type. Failure extremely improbable, but nevertheless...
                  int constValue = ((ConstExprent)arrExpr.getIndex()).getIntValue();
                  if (constValue < size && !mapInit.containsKey(constValue)) {
                    if (!aas.getRight().containsExprent(arrVar)) {
                      mapInit.put(constValue, aas.getRight());
                      found = true;
                    }
                  }
                }
              }
            }

            if (!found) {
              break;
            }

            i++;
          }

          double fraction = ((double)mapInit.size()) / size;

          if ((arrVar.isStack() && fraction > 0) || (size <= 7 && fraction >= 0.3) || (size > 7 && fraction >= 0.7)) {
            List<Exprent> lstRet = new ArrayList<>();

            VarType arrayType = newExpr.getNewType().decreaseArrayDim();
            ConstExprent defaultVal = ExprProcessor.getDefaultArrayValue(arrayType);
            for (int j = 0; j < size; j++) {
              lstRet.add(defaultVal.copy());
            }

            int dims = newExpr.getNewType().getArrayDim();
            for (Entry<Integer, Exprent> ent : mapInit.entrySet()) {
              Exprent tempExpr = ent.getValue();
              lstRet.set(ent.getKey(), tempExpr);

              if (tempExpr.type == Exprent.EXPRENT_NEW) {
                NewExprent tempNewExpr = (NewExprent)tempExpr;
                if (dims > 1 && !tempNewExpr.getLstArrayElements().isEmpty()) {
                  tempNewExpr.setDirectArrayInit(true);
                }
              }
            }

            newExpr.setLstArrayElements(lstRet);

            return mapInit.size();
          }
        }
      }
    }

    return 0;
  }