add fallback to the previous schema versions for docs and mappings

before it was breaking part of BlenderBIM UI if we would open IFC4X1 file

src/ifcopenshell-python/ifcopenshell/util/doc.py

@@ -98,11 +98,14 @@ def get_db(version):
 
                 with open(schema_path, "r") as fi:
                     db[ifc_version][data_type] = json.load(fi)
+
+    version = ifcopenshell.util.schema.get_fallback_schema(version)
     return db.get(version)
 
 
 def get_schema_by_name(version):
     global schema_by_name
+    version = ifcopenshell.util.schema.get_fallback_schema(version)
     if not schema_by_name[version]:
         schema_by_name[version] = ifcopenshell.ifcopenshell_wrapper.schema_by_name(version)
     return schema_by_name[version]

src/ifcopenshell-python/ifcopenshell/util/schema.py

@@ -28,6 +28,16 @@ import ifcopenshell.util.attribute
 cwd = os.path.dirname(os.path.realpath(__file__))
 
 
+def get_fallback_schema(version):
+    """fallback to the schema version we do have docs and mapping for,
+    needed to support IFC versions like 4X3_RC1, 4X1 etc"""
+    if version.startswith("IFC4X3"):
+        version = "IFC4X3"
+    elif version.startswith("IFC4"):
+        version = "IFC4"
+    return version
+
+
 def is_a(entity, ifc_class):
     ifc_class = ifc_class.upper()
     if entity.name_uc() == ifc_class:

src/ifcopenshell-python/ifcopenshell/util/type.py

@@ -18,6 +18,7 @@
 
 import os
 import json
+import ifcopenshell.util.schema
 
 cwd = os.path.dirname(os.path.realpath(__file__))
 
@@ -51,8 +52,10 @@ for schema in mapped_schemas:
 
 
 def get_applicable_types(ifc_class, schema="IFC4"):
-    return entity_to_type_map[schema.upper()].get(ifc_class, [])
+    schema = ifcopenshell.util.schema.get_fallback_schema(schema.upper())
+    return entity_to_type_map[schema].get(ifc_class, [])
 
 
 def get_applicable_entities(ifc_type_class, schema="IFC4"):
-    return type_to_entity_map[schema.upper()].get(ifc_type_class, [])
+    schema = ifcopenshell.util.schema.get_fallback_schema(schema.upper())
+    return type_to_entity_map[schema].get(ifc_type_class, [])