fix: Fix error when a digit immediately follows a code tag

Fixes #169.
PR #175.

Co-authored-by: Timothée Mazzucotelli <pawamoy@pm.me>

src/mkdocstrings/references.py

@@ -50,7 +50,7 @@ def store(self, value: str) -> str:
         Returns:
             The ID under which the text is stored.
         """
-        new_id = f"{self.seed}{len(self._store)}"
+        new_id = f"\x02{self.seed}{len(self._store)}\x03"
         self._store.append(value)
         return new_id
 
@@ -78,7 +78,7 @@ def restore_code_tags(self, soup_str: str) -> str:
         Returns:
             The same HTML text with placeholders replaced by their respective original code nodes.
         """
-        return re.sub(rf"{self.seed}(\d+)", self._replace_id_with_value, soup_str)
+        return re.sub(rf"\x02{self.seed}(\d+)\x03", self._replace_id_with_value, soup_str)
 
     def _replace_id_with_value(self, match):
         return self._store[int(match.group(1))]

tests/test_references.py

@@ -1,7 +1,8 @@
 """Tests for the references module."""
 import pytest
+from bs4 import BeautifulSoup
 
-from mkdocstrings.references import relative_url
+from mkdocstrings.references import Placeholder, relative_url
 
 
 @pytest.mark.parametrize(
@@ -34,3 +35,21 @@ def test_relative_url(current_url, to_url, href_url):
         href_url: The relative URL to put in the `href` HTML field.
     """
     assert relative_url(current_url, to_url) == href_url
+
+
+@pytest.mark.parametrize("html", ["foo<code>code content</code>4"])
+def test_placeholder(html):
+    """
+    Test the references "fixing" mechanism.
+
+    Arguments:
+        html: HTML contents in which to fix references.
+    """
+    placeholder = Placeholder()
+
+    soup = BeautifulSoup(html, "html.parser")
+    placeholder.replace_code_tags(soup)
+    html_with_placeholders = str(soup).replace("code content", "should not be replaced")
+
+    html_restored = placeholder.restore_code_tags(html_with_placeholders)
+    assert html == html_restored