Fixed #75 (Python PCell issue when parameters are called 'layer')

This commit
- Ignores exceptions when checking for PCells that accept shapes.
  Hence a single rogue one does not break the feature.
- Prevents errors when parameters named "layer" are present
  by making the implementation safe against this case.
- In addition, guiding shape parameters of type "Path", "Box" etc.
  (i.e. integer types) are supported too although they are
  not recommended for portability.

src/db/db/built-in-pymacros/pcell_declaration_helper.lym

@@ -226,16 +226,27 @@ class _PCellDeclarationHelperLayerDescriptor(object):
 class _PCellDeclarationHelperParameterDescriptor(object):
   """
   A descriptor object which translates the PCell parameters into class attributes
+
+  In some cases (i.e. can_convert_from_shape), these placeholders are not 
+  connected to real parameters (obj._param_values is None). In this case,
+  the descriptor acts as a value holder (self.value)
   """
   
   def __init__(self, param_index):
     self.param_index = param_index
+    self.value = None
   
   def __get__(self, obj, type = None):
+    if obj._param_values:
       return obj._param_values[self.param_index]
+    else:
+      return self.value
     
   def __set__(self, obj, value):
+    if obj._param_values:
       obj._param_values[self.param_index] = value
+    else:
+      self.value = value
 
 class _PCellDeclarationHelper(pya.PCellDeclaration):
   """  

src/db/db/dbPCellVariant.cc

@@ -186,15 +186,28 @@ PCellVariant::update (ImportLayerMapping *layer_mapping)
 
           shapes (layout ()->guiding_shape_layer ()).insert (db::BoxWithProperties(db::Box (m_parameters[i].to_user<db::DBox> () * (1.0 / layout ()->dbu ())), layout ()->properties_repository ().properties_id (props)));
 
+        } else if (m_parameters[i].is_user<db::Box> ()) {
+
+          shapes (layout ()->guiding_shape_layer ()).insert (db::BoxWithProperties(m_parameters[i].to_user<db::Box> (), layout ()->properties_repository ().properties_id (props)));
+
         } else if (m_parameters[i].is_user<db::DEdge> ()) {
 
           shapes (layout ()->guiding_shape_layer ()).insert (db::EdgeWithProperties(db::Edge (m_parameters[i].to_user<db::DEdge> () * (1.0 / layout ()->dbu ())), layout ()->properties_repository ().properties_id (props)));
 
+        } else if (m_parameters[i].is_user<db::Edge> ()) {
+
+          shapes (layout ()->guiding_shape_layer ()).insert (db::EdgeWithProperties(m_parameters[i].to_user<db::Edge> (), layout ()->properties_repository ().properties_id (props)));
+
         } else if (m_parameters[i].is_user<db::DPoint> ()) {
 
           db::DPoint p = m_parameters[i].to_user<db::DPoint> ();
           shapes (layout ()->guiding_shape_layer ()).insert (db::BoxWithProperties(db::Box (db::DBox (p, p) * (1.0 / layout ()->dbu ())), layout ()->properties_repository ().properties_id (props)));
 
+        } else if (m_parameters[i].is_user<db::Point> ()) {
+
+          db::Point p = m_parameters[i].to_user<db::Point> ();
+          shapes (layout ()->guiding_shape_layer ()).insert (db::BoxWithProperties(db::Box (p, p), layout ()->properties_repository ().properties_id (props)));
+
         } else if (m_parameters[i].is_user<db::DPolygon> ()) {
 
           db::complex_trans<db::DCoord, db::Coord> dbu_trans (1.0 / layout ()->dbu ());
@@ -202,11 +215,21 @@ PCellVariant::update (ImportLayerMapping *layer_mapping)
           //  Hint: we don't compress the polygon since we don't want to loose information
           shapes (layout ()->guiding_shape_layer ()).insert (db::PolygonWithProperties(poly, layout ()->properties_repository ().properties_id (props)));
 
+        } else if (m_parameters[i].is_user<db::Polygon> ()) {
+
+          db::Polygon poly = m_parameters[i].to_user<db::Polygon> ();
+          //  Hint: we don't compress the polygon since we don't want to loose information
+          shapes (layout ()->guiding_shape_layer ()).insert (db::PolygonWithProperties(poly, layout ()->properties_repository ().properties_id (props)));
+
         } else if (m_parameters[i].is_user<db::DPath> ()) {
 
           db::complex_trans<db::DCoord, db::Coord> dbu_trans (1.0 / layout ()->dbu ());
           shapes (layout ()->guiding_shape_layer ()).insert (db::PathWithProperties(dbu_trans * m_parameters[i].to_user<db::DPath> (), layout ()->properties_repository ().properties_id (props)));
 
+        } else if (m_parameters[i].is_user<db::Path> ()) {
+
+          shapes (layout ()->guiding_shape_layer ()).insert (db::PathWithProperties(m_parameters[i].to_user<db::Path> (), layout ()->properties_repository ().properties_id (props)));
+
         }
 
       }

src/edt/edt/edtMainService.cc

@@ -1084,6 +1084,8 @@ MainService::cm_convert_to_pcell ()
     db::Library *lib = db::LibraryManager::instance ().lib (l->second);
     for (db::Layout::pcell_iterator pc = lib->layout ().begin_pcells (); pc != lib->layout ().end_pcells (); ++pc) {
 
+      try {
+
         const db::PCellDeclaration *pc_decl = lib->layout ().pcell_declaration (pc->second);
         size_t n = 1000; // 1000 tries max.
         for (std::vector<edt::Service *>::const_iterator es = edt_services.begin (); n > 0 && pc_decl && es != edt_services.end (); ++es) {
@@ -1103,6 +1105,10 @@ MainService::cm_convert_to_pcell ()
           items.push_back (tl::to_qstring (lib->get_name () + "." + pc_decl->name ()));
         }
 
+      } catch (...) {
+        //  ignore errors in can_create_from_shape
+      }
+
     }
 
   }