postcodes: introduce a default pattern for countries without postcodes

nominatim/tokenizer/sanitizers/clean_postcodes.py

@@ -75,6 +75,12 @@ class _PostcodeSanitizer:
             else:
                 raise UsageError(f"Invalid entry 'postcode' for country '{ccode}'")
 
+        default_pattern = config.get('default-pattern')
+        if default_pattern is not None and isinstance(default_pattern, str):
+            self.default_matcher = _PostcodeMatcher('', {'pattern': default_pattern})
+        else:
+            self.default_matcher = None
+
 
     def __call__(self, obj):
         if not obj.address:
@@ -103,14 +109,16 @@ class _PostcodeSanitizer:
         if country in self.country_without_postcode:
             return None
 
-        matcher = self.country_matcher.get(country)
+        matcher = self.country_matcher.get(country, self.default_matcher)
-        if matcher is not None:
+        if matcher is None:
-            match = matcher.match(postcode)
+            return postcode.upper(), ''
-            if match is None:
+
-                return None
+        match = matcher.match(postcode)
-            return matcher.normalize(match), ' '.join(match.groups())
+        if match is None:
+            return None
+
+        return matcher.normalize(match), ' '.join(match.groups())
 
-        return postcode.upper(), ''
 
 
 

settings/icu_tokenizer.yaml

@@ -34,6 +34,7 @@ sanitizers:
         - (\A|.*,)[^\d,]{3,}(,.*|\Z)
     - step: clean-postcodes
       convert-to-address: yes
+      default-pattern: [A-Z0-9- ]{3,12}
     - step: split-name-list
     - step: strip-brace-terms
     - step: tag-analyzer-by-language

test/python/tokenizer/sanitizers/test_clean_postcodes.py

@@ -88,3 +88,15 @@ def test_postcode_sweden_pass(sanitize, postcode):
 def test_postcode_sweden_fail(sanitize, postcode):
     assert sanitize(country='se', postcode=postcode) == []
 
+
+@pytest.mark.parametrize("postcode", ('AB1', '123-456-7890', '1 as 44'))
+@pytest.mark.sanitizer_params(default_pattern='[A-Z0-9- ]{3,12}')
+def test_postcode_default_pattern_pass(sanitize, postcode):
+    assert sanitize(country='an', postcode=postcode) == [('postcode', postcode.upper())]
+
+
+@pytest.mark.parametrize("postcode", ('C', '12', 'ABC123DEF 456', '1234,5678', '11223;11224'))
+@pytest.mark.sanitizer_params(convert_to_address=False, default_pattern='[A-Z0-9- ]{3,12}')
+def test_postcode_default_pattern_fail(sanitize, postcode):
+    assert sanitize(country='an', postcode=postcode) == []
+