set_query_parameter: parse key=levidx

libcdi @ 2c786cad

-Subproject commit 12a7893cbae4aa7b33a6d67d2d683fb1204f0208
+Subproject commit 2c786cad0d08c0dfcf59c4cd79bc19f9c2ffe089

src/cdo_query.cc

@@ -46,6 +46,27 @@ decode_cell_parameter(std::string const &param)
   return cells;
 }
 
+static std::vector<int>
+decode_levidx_parameter(std::string const &param)
+{
+  const std::string separator("/to/");
+
+  std::vector<int> levidx;
+  auto n = param.find(separator);
+  if (n == std::string::npos) { levidx.push_back(parameter_to_int(param)); }
+  else
+    {
+      auto v1 = parameter_to_int(param.substr(0, n));
+      auto v2 = parameter_to_int(param.substr(n + separator.size()));
+      if (v2 < v1) cdo_abort("Second parameter %zu muss be greater than first parameter %zu!", v2, v1);
+      levidx.push_back(v1);
+      auto numVals = (v2 - v1 + 1);
+      if (numVals > 1) levidx.push_back(numVals);
+    }
+
+  return levidx;
+}
+
 std::string
 set_query_parameter(const KVList &kvlist, CdiQuery *query)
 {
@@ -57,14 +78,10 @@ set_query_parameter(const KVList &kvlist, CdiQuery *query)
       int numValues = kv.nvalues;
       if (numValues < 1) cdo_abort("Missing value for parameter key >%s<!", key);
 
-      // clang-format off
       if (key == "name")
         {
-          std::vector<char*> queryNames(numValues);
-          for (int i = 0; i < numValues; ++i)
-            {
-              queryNames[i] = (char*)kv.values[i].c_str();
-            }
+          std::vector<char *> queryNames(numValues);
+          for (int i = 0; i < numValues; ++i) { queryNames[i] = (char *) kv.values[i].c_str(); }
           cdiQuerySetNames(query, queryNames.size(), queryNames.data());
         }
       else if (key == "step")
@@ -85,13 +102,18 @@ set_query_parameter(const KVList &kvlist, CdiQuery *query)
           auto queryCells = decode_cell_parameter(kv.values[0]);
           cdiQuerySetCellidx(query, queryCells.size(), queryCells.data());
         }
+      else if (key == "levidx")
+        {
+          if (numValues > 1) cdo_abort("Too many values for key=levidx (maxvalues=1 or range=start/to/end)");
+          auto queryCells = decode_levidx_parameter(kv.values[0]);
+          cdiQuerySetLevidx(query, queryCells.size(), queryCells.data());
+        }
       else if (key == "path")
         {
           path = kv.values[0];
-          for (int i = 1; i < numValues; ++i) path += "," + kv.values[i];
+          for (int i = 1; i < numValues; ++i) { path += "," + kv.values[i]; }
         }
-      else cdo_abort("Invalid parameter key >%s<!", key);
-      // clang-format on
+      else { cdo_abort("Invalid parameter key >%s<!", key); }
     }
 
   return path;