create a "NormalizedLicenseExpression" type

pypa · Sep 13, 2024 · e699391 · e699391
1 parent e469b7e
commit e699391
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/src/packaging/licenses/__init__.py b/src/packaging/licenses/__init__.py
@@ -32,11 +32,14 @@
 from __future__ import annotations
 
 import re
+from typing import NewType
 
 from packaging.licenses.spdx import EXCEPTIONS, LICENSES
 
 license_ref_allowed = re.compile("^[A-Za-z0-9.-]*$")
 
+NormalizedLicenseExpression = NewType("NormalizedLicenseExpression", str)
+
 
 class InvalidLicenseExpression(ValueError):
  """Raised when a license-expression string
@@ -48,11 +51,11 @@ class InvalidLicenseExpression(ValueError):
  """
 
 
-def normalize_license_expression(raw_license_expression: str) -> str | None:
+def normalize_license_expression(
+ raw_license_expression: str,
+) -> str | NormalizedLicenseExpression:
  if raw_license_expression == "":
- message = (
- f"Invalid license expression: {raw_license_expression}"
- )
+ message = f"Invalid license expression: {raw_license_expression}"
  raise InvalidLicenseExpression(message)
 
  license_refs = {