improve handling of leading postcodes

Setting the direction of the query while yielding assignments is
a bad idea because it may override a direction already set.

diff --git a/src/nominatim_api/search/token_assignment.py b/src/nominatim_api/search/token_assignment.py
index 3ca9385cf91fe35c35d3217c29a0286a82d262c7..de75318ae24b51f3d27e8d4de23c624b65c6d7b9 100644 (file)
--- a/src/nominatim_api/search/token_assignment.py
+++ b/src/nominatim_api/search/token_assignment.py
@@ -269,10 +269,8 @@ class _TokenSequence:
             # <address>,<postcode> should give preference to address search
             if base.postcode.start == 0:
                 penalty = self.penalty
-                self.direction = -1  # name searches are only possible backwards
             else:
                 penalty = self.penalty + 0.1
-                self.direction = 1  # name searches are only possible forwards
             yield dataclasses.replace(base, penalty=penalty)
 
     def _get_assignments_address_forward(self, base: TokenAssignment,
@@ -282,6 +280,11 @@ class _TokenSequence:
         """
         first = base.address[0]
 
+        # The postcode must come after the name.
+        if base.postcode and base.postcode < first:
+            log().var_dump('skip forward', (base.postcode, first))
+            return
+
         log().comment('first word = name')
         yield dataclasses.replace(base, penalty=self.penalty,
                                   name=first, address=base.address[1:])
@@ -317,7 +320,12 @@ class _TokenSequence:
         """
         last = base.address[-1]
 
-        if self.direction == -1 or len(base.address) > 1:
+        # The postcode must come before the name for backward direction.
+        if base.postcode and base.postcode > last:
+            log().var_dump('skip backward', (base.postcode, last))
+            return
+
+        if self.direction == -1 or len(base.address) > 1 or base.postcode:
             log().comment('last word = name')
             yield dataclasses.replace(base, penalty=self.penalty,
                                       name=last, address=base.address[:-1])