bug fix: parsing error for edge without transformation

Geo/GModelIO_GEO.cpp

@@ -339,7 +339,7 @@ int GModel::importGEOInternals()
     GEO_Internals::MasterEdge& me = peIter->second;
     int iSource = me.tag;
     GEdge* target = getEdgeByTag(iTarget);
-    GEdge* source = getEdgeByTag(iSource);
+    GEdge* source = getEdgeByTag(abs(iSource));
     if (!target)
       Msg::Error("Unknown target line for periodic connection from %d to %d",
                  iTarget, iSource);

Parser/Gmsh.y

@@ -4050,14 +4050,16 @@ Constraints :
               "slaves (%d) ", List_Nbr($8), List_Nbr($4));
       }
       else{
+				std::vector<double> transfo;
+				if (List_Nbr($10) != 0) {	
 					if (List_Nbr($10) < 12){
-          // FIXME Koen restore full automatic case here if List_Nbr($10) == 0)
-          yymsg(0, "Affine transformation requires at least 12 entries");
+						yymsg(0, "Affine transformation requires at least 12 entries (we have %d)",List_Nbr($10));
 					}
 					else {
-          std::vector<double> transfo(16,0);
-          for(int i = 0; i < List_Nbr($10); i++)
-            List_Read($10, i, &transfo[i]);
+						transfo.resize(List_Nbr($10));
+						for(int i = 0; i < List_Nbr($10); i++) List_Read($10, i, &transfo[i]);
+					}
+				}
 				for(int i = 0; i < List_Nbr($4); i++){
 					double d_master, d_slave;
 					List_Read($8, i, &d_master);
@@ -4067,7 +4069,6 @@ Constraints :
 					addPeriodicEdge(j_slave,j_master,transfo);
 				}
 			}
-      }
       List_Delete($4);
       List_Delete($8);
     }
@@ -6060,7 +6061,7 @@ void addPeriodicEdge(int iTarget,int iSource,
     if (!target || !source)
       Msg::Error("Could not find surface %d or %d for periodic copy",
                  iTarget,iSource);
-    if (affineTransform.size() == 16) {
+    if (affineTransform.size() >= 12) {
       target->setMeshMaster(source,affineTransform);
     }
     else {