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[nominatim.git] / nominatim / api / search / query.py

diff --git a/nominatim/api/search/query.py b/nominatim/api/search/query.py
index 4e28d3658db30644d70f3b7cb91f28dd16561513..5d75eb0fbe98c492638bbb174b5db930490f6788 100644 (file)
--- a/nominatim/api/search/query.py
+++ b/nominatim/api/search/query.py
@@ -7,7 +7,7 @@
 """
 Datastructures for a tokenized query.
 """
 """
 Datastructures for a tokenized query.
 """

-from typing import List, Tuple, Optional, NamedTuple, Iterator
+from typing import List, Tuple, Optional, Iterator

 from abc import ABC, abstractmethod
 import dataclasses
 import enum
 from abc import ABC, abstractmethod
 import dataclasses
 import enum


@@ -107,13 +107,47 @@ class Token(ABC):
             category objects.
         """
 
             category objects.
         """
 

-
-class TokenRange(NamedTuple):
+@dataclasses.dataclass
+class TokenRange:

     """ Indexes of query nodes over which a token spans.
     """
     start: int
     end: int
 
     """ Indexes of query nodes over which a token spans.
     """
     start: int
     end: int
 

+    def __lt__(self, other: 'TokenRange') -> bool:
+        return self.end <= other.start
+
+
+    def __le__(self, other: 'TokenRange') -> bool:
+        return NotImplemented
+
+
+    def __gt__(self, other: 'TokenRange') -> bool:
+        return self.start >= other.end
+
+
+    def __ge__(self, other: 'TokenRange') -> bool:
+        return NotImplemented
+
+
+    def replace_start(self, new_start: int) -> 'TokenRange':
+        """ Return a new token range with the new start.
+        """
+        return TokenRange(new_start, self.end)
+
+
+    def replace_end(self, new_end: int) -> 'TokenRange':
+        """ Return a new token range with the new end.
+        """
+        return TokenRange(self.start, new_end)
+
+
+    def split(self, index: int) -> Tuple['TokenRange', 'TokenRange']:
+        """ Split the span into two spans at the given index.
+            The index must be within the span.
+        """
+        return self.replace_end(index), self.replace_start(index)
+

 
 @dataclasses.dataclass
 class TokenList:
 
 @dataclasses.dataclass
 class TokenList:


@@ -151,7 +185,10 @@ class QueryNode:
             and ending at the node 'end'. Returns 'None' if no such
             tokens exist.
         """
             and ending at the node 'end'. Returns 'None' if no such
             tokens exist.
         """

-        return next((t.tokens for t in self.starting if t.end == end and t.ttype == ttype), None)
+        for tlist in self.starting:
+            if tlist.end == end and tlist.ttype == ttype:
+                return tlist.tokens
+        return None

 
 
 @dataclasses.dataclass
 
 
 @dataclasses.dataclass