refactor: isolate inline parser state bounds

Author: lepture

src/mistune/core.py

@@ -151,8 +151,6 @@ def copy(self) -> "InlineState":
         state.in_image = self.in_image
         state.image_depth = self.image_depth
         state.in_link = self.in_link
-        state.no_link_before = self.no_link_before
-        state.no_image_before = self.no_image_before
         state.link_brackets = self.link_brackets
         state.link_ranges = self.link_ranges
         state.formatting_no_end = self.formatting_no_end

src/mistune/helpers.py

@@ -146,7 +146,7 @@ def _parse_link_href(
     if src[pos] == "<":
         href, href_pos = _parse_angle_link_href(src, pos)
         if href is None:
-            return None, None, len(src)
+            return None, None, pos
         assert href_pos is not None
         return href, href_pos, href_pos
     if block and src[pos] in ASCII_WHITESPACE:

src/mistune/inline_parser.py

@@ -884,14 +884,6 @@ def _emphasis_depth(tokens: List[Dict[str, Any]]) -> int:
     return max_depth
 
 
-def _has_strong_enabled(parts: List[Dict[str, Any]], opener: _Delimiter, closer: _Delimiter) -> bool:
-    return _has_strong_enabled_at(parts, opener.index, closer.index)
-
-
-def _has_emphasis_enabled(parts: List[Dict[str, Any]], opener: _Delimiter, closer: _Delimiter) -> bool:
-    return _has_emphasis_enabled_at(parts, opener.index, closer.index)
-
-
 def _has_strong_enabled_at(parts: List[Dict[str, Any]], opener_index: int, closer_index: int) -> bool:
     return len(_text_raw(parts[opener_index])) >= 2 and len(_text_raw(parts[closer_index])) >= 2
 

tests/test_security_edge_cases.py

@@ -86,3 +86,17 @@ def render(size):
         large = _best_time(render, 4000)
 
         self.assertLess(large, small * 3 + 0.05)
+
+    def test_failed_parent_destination_does_not_hide_nested_images(self):
+        md = create_markdown()
+        self.assertEqual(
+            md("[](foo( [outer ![inner](url)](/outer)"),
+            '<p>[](foo( <a href="/outer">outer <img src="url" alt="inner" /></a></p>\n',
+        )
+
+    def test_failed_angle_destination_does_not_hide_later_links(self):
+        md = create_markdown()
+        self.assertEqual(
+            md("[]( <foo [bar](/url)"),
+            '<p>[]( &lt;foo <a href="/url">bar</a></p>\n',
+        )