Simplify transforming links to widgets

toot/tui/richtext.py

@@ -10,6 +10,10 @@
 from urwid.util import decompose_tagmarkup
 
 
+# Matches anchor titles with an ETX separator followed by href
+ANCHOR_PATTERN = re.compile(r"(^.+)\x03(.+$)")
+
+
 class ContentParser:
     def __init__(self):
         self.palette_names = []
@@ -102,27 +106,27 @@ def text_to_widget(self, attr, markup) -> urwid.Widget:
         if not has_urwidgets:
             return urwid.Text((attr, markup))
 
-        TRANSFORM = {
-            # convert http[s] URLs to Hyperlink widgets for nesting in a TextEmbed widget
-            re.compile(r"(^.+)\x03(.+$)"): lambda g: (
-                len(g[1]),
-                urwid.Filler(Hyperlink(g[2], anchor_attr, g[1])),
-            ),
-        }
         markup_list = []
 
+        # Convert http[s] URLs to Hyperlink widgets for nesting in a TextEmbed widget
+        def _groups_to_widget(groups):
+            return (
+                len(groups[1]),
+                urwid.Filler(Hyperlink(groups[2], anchor_attr, groups[1])),
+            )
+
         for run in markup:
             if isinstance(run, tuple):
                 txt, attr_list = decompose_tagmarkup(run)
-                # find anchor titles with an ETX separator followed by href
-                m = re.match(r"(^.+)\x03(.+$)", txt)
+
+                m = ANCHOR_PATTERN.match(txt)
                 if m:
                     anchor_attr = self.get_best_anchor_attr(attr_list)
                     markup_list.append(
                         parse_text(
                             txt,
-                            TRANSFORM,
-                            lambda pattern, groups, span: TRANSFORM[pattern](groups),
+                            [ANCHOR_PATTERN],
+                            lambda pattern, groups, span: _groups_to_widget(groups),
                         )
                     )
                 else: