Preserve empty-title wikilink nodes

src/mwparserfromhell/parser/builder.py

@@ -162,14 +162,8 @@ class Builder:
                 self._push()
             elif isinstance(token, tokens.WikilinkClose):
                 if title is not None:
-                    wikilink = Wikilink(title, self._pop())
-                else:
-                    wikilink = Wikilink(self._pop())
-                # MediaWiki treats [[]] and [[|...]] (empty title) as plain
-                # text rather than actual wikilinks.
-                if not str(wikilink.title):
-                    return Text(str(wikilink))
-                return wikilink
+                    return Wikilink(title, self._pop())
+                return Wikilink(self._pop())
             else:
                 self._write(self._handle_token(token))
         raise ParserError("_handle_wikilink() missed a close token")

src/mwparserfromhell/wikicode.py

@@ -761,8 +761,12 @@ class Wikicode(StringMixIn):
         This is equivalent to :meth:`ifilter` with *forcetype* set to
         :class:`~wikilink.Wikilink`.
         """
-        return self.ifilter(
-            recursive=recursive, matches=matches, flags=flags, forcetype=Wikilink
+        return (
+            node
+            for node in self.ifilter(
+                recursive=recursive, matches=matches, flags=flags, forcetype=Wikilink
+            )
+            if str(node.title)
         )
 
     @overload
@@ -934,8 +938,8 @@ class Wikicode(StringMixIn):
         This is equivalent to :meth:`filter` with *forcetype* set to
         :class:`~wikilink.Wikilink`.
         """
-        return self.filter(
-            recursive=recursive, matches=matches, flags=flags, forcetype=Wikilink
+        return list(
+            self.ifilter_wikilinks(recursive=recursive, matches=matches, flags=flags)
         )
 
     def get_sections(

tests/test_parser.py

@@ -113,13 +113,15 @@ def test_skip_style_tags(pyparser):
         "[[|||]]",
     ],
 )
-def test_empty_title_wikilink_is_text(text):
-    """[[]] and [[|...]] have an empty title and should not be wikilinks.
+def test_empty_title_wikilink_filter_wikilinks(text):
+    """[[]] and [[|...]] have an empty title and should not be links.
 
-    MediaWiki does not render these as hyperlinks; the parser must treat them
-    as plain text so that filter_wikilinks() does not return false positives.
+    MediaWiki does not render these as hyperlinks; filter_wikilinks() should
+    not return false positives, while the parsed Wikilink node remains
+    available to tools that want to detect and fix invalid wikilinks.
     Regression test for https://github.com/earwig/mwparserfromhell/issues/292.
     """
     parsed = parser.Parser().parse(text)
     assert parsed.filter_wikilinks() == []
+    assert isinstance(parsed.get(0), Wikilink)
     assert str(parsed) == text