XML errors: make file and line more clear

dev_tools/nxdl/syntax.py

@@ -1,4 +1,5 @@
 from typing import Optional
+from contextlib import contextmanager
 
 import lxml.etree
 
@@ -16,13 +17,17 @@ def validate_definition(
  xml_schema: Optional[lxml.etree.XMLSchema] = None,
 ):
  xml_file_name = str(xml_file_name)
- try:
+ with _handle_xml_error(xml_file_name, lxml.etree.XMLSyntaxError):
  xml_tree = lxml.etree.parse(xml_file_name)
- except lxml.etree.XMLSyntaxError:
- raise errors.XMLSyntaxError(xml_file_name)
  if xml_schema is None:
  xml_schema = nxdl_schema()
- try:
+ with _handle_xml_error(xml_file_name, lxml.etree.DocumentInvalid):
  xml_schema.assertValid(xml_tree)
- except lxml.etree.DocumentInvalid:
- raise errors.NXDLSyntaxError(xml_file_name)
+
+
+@contextmanager
+def _handle_xml_error(xml_file_name: str, *exception_types):
+ try:
+ yield
+ except exception_types as e:
+ raise errors.XMLSyntaxError(f"\n {xml_file_name}:\n {e}") from e