edge cases

Author: willmcgugan

src/textual/markup.py

@@ -409,11 +409,12 @@ def process_text(template_text: str, /) -> str:
                 if not style_stack:
                     raise MarkupError("auto closing tag ('[/]') has nothing to close")
                 open_position, tag_body, _ = style_stack.pop()
-                spans.append(Span(open_position, position, tag_body))
+                if open_position != position:
+                    spans.append(Span(open_position, position, tag_body))
 
     content_text = "".join(text)
     text_length = len(content_text)
-    if style_stack:
+    if style_stack and text_length:
         spans.extend(
             [
                 Span(position, text_length, tag_body)
@@ -425,7 +426,7 @@ def process_text(template_text: str, /) -> str:
 
     content = Content(
         content_text,
-        [Span(0, text_length, style), *spans] if style else spans,
+        [Span(0, text_length, style), *spans] if (style and text_length) else spans,
     )
 
     return content

tests/test_markup.py

@@ -136,6 +136,11 @@
                 ],
             ),
         ),
+        # Edge cases
+        ("[bold][/bold]", Content("")),
+        ("[bold][/]", Content("")),
+        ("[bold]", Content("")),
+        ("", Content("")),
     ],
 )
 def test_to_content(markup: str, content: Content):