New node to read IFC entities

src/ifcsverchok/__init__.py

@@ -27,6 +27,7 @@ def nodes_index():
         ("ifc.write_file", "SvIfcWriteFile"),
         ("ifc.create_entity", "SvIfcCreateEntity"),
         ("ifc.create_shape", "SvIfcCreateShape"),
+        ("ifc.read_entity", "SvIfcReadEntity"),
         ("ifc.by_id", "SvIfcById"),
         ("ifc.by_guid", "SvIfcByGuid"),
         ("ifc.by_type", "SvIfcByType"),

src/ifcsverchok/nodes/ifc/read_entity.py

@@ -0,0 +1,59 @@
+import bpy
+import ifcopenshell
+import ifcsverchok.helper
+from bpy.props import StringProperty
+from sverchok.node_tree import SverchCustomTreeNode
+from sverchok.data_structure import updateNode
+
+
+class SvIfcReadEntity(bpy.types.Node, SverchCustomTreeNode, ifcsverchok.helper.SvIfcCore):
+    bl_idname = 'SvIfcReadEntity'
+    bl_label = 'IFC Read Entity'
+    file: StringProperty(name='file', update=updateNode)
+    entity: StringProperty(name='entity', update=updateNode)
+    current_ifc_class: StringProperty(name='current_ifc_class')
+
+    def sv_init(self, context):
+        self.inputs.new('SvStringsSocket', 'file').prop_name = 'file'
+        self.inputs.new('SvStringsSocket', 'entity').prop_name = 'entity'
+        self.outputs.new('SvStringsSocket', 'id')
+        self.outputs.new('SvStringsSocket', 'is_a')
+
+    def process(self):
+        self.sv_input_names = ['file', 'entity']
+        ifc_class = self.inputs['entity'].sv_get()[0][0]
+        if ifc_class:
+            ifc_class = ifc_class.is_a()
+            file = self.inputs['file'].sv_get()[0][0]
+            if file:
+                schema_name = file.wrapped_data.schema
+            else:
+                schema_name = 'IFC4'
+            self.schema = ifcopenshell.ifcopenshell_wrapper.schema_by_name(schema_name)
+            self.entity_schema = self.schema.declaration_by_name(ifc_class)
+
+            if ifc_class != self.current_ifc_class:
+                self.generate_outputs(ifc_class)
+        super().process()
+
+    def generate_outputs(self, ifc_class):
+        while len(self.outputs) > 2:
+            self.outputs.remove(self.outputs[-1])
+        for i in range(0, self.entity_schema.attribute_count()):
+            name = self.entity_schema.attribute_by_index(i).name()
+            self.outputs.new('SvStringsSocket', name).prop_name = name
+        self.current_ifc_class = ifc_class
+
+    def process_ifc(self, file, entity):
+        self.outputs['id'].sv_set([[entity.id()]])
+        self.outputs['is_a'].sv_set([[entity.is_a()]])
+        for i in range(0, self.entity_schema.attribute_count()):
+            name = self.entity_schema.attribute_by_index(i).name()
+            self.outputs[name].sv_set([[entity[i]]])
+
+
+def register():
+    bpy.utils.register_class(SvIfcReadEntity)
+
+def unregister():
+    bpy.utils.unregister_class(SvIfcReadEntity)