add [lb], [rb], and [@] tags

app/lib/babycode.py

@@ -141,6 +141,12 @@ TAGS = {
     "spoiler": tag_spoiler,
 }
 
+VOID_TAGS = {
+    'lb': lambda attr: '[',
+    'rb': lambda attr: ']',
+    '@': lambda attr: '@',
+}
+
 # [img] is considered block for the purposes of collapsing whitespace,
 # despite being potentially inline (since the resulting <img> tag is inline, but creates a block container around itself and sibling images).
 # [code] has a special case in is_inline().
@@ -260,6 +266,7 @@ def babycode_to_html(s, banned_tags=[]):
     subj = sanitize(s)
     parser = Parser(subj)
     parser.valid_bbcode_tags = allowed_tags
+    parser.void_bbcode_tags = set(VOID_TAGS)
     parser.bbcode_tags_only_text_children = TEXT_ONLY
     parser.mentions_allowed = '@mention' not in banned_tags
     parser.valid_emotes = EMOJI.keys()
@@ -296,6 +303,8 @@ def babycode_to_html(s, banned_tags=[]):
                     c = c + Markup(fold(child, _nobr, _surrounding))
                 res = TAGS[element['name']](c, element['attr'], surrounding)
                 return res
+            case "bbcode_void":
+                return VOID_TAGS[element['name']](element['attr'])
             case "link":
                 return f"<a href=\"{element['url']}\">{element['url']}</a>"
             case 'emote':