Merge pull request #3027 from dato/find_links_wrapped_punct

Fix parsing of punctuation in format_links()

fixes #2993  
fixes #3049

bookwyrm/tests/views/test_status.py

@@ -420,21 +420,25 @@ http://www.fish.com/"""
             'okay\n\n<a href="http://www.fish.com/">www.fish.com/</a>',
         )
 
-    def test_format_links_parens(self, *_):
-        """find and format urls into a tags"""
-        url = "http://www.fish.com/"
-        self.assertEqual(
-            views.status.format_links(f"({url})"),
-            f'(<a href="{url}">www.fish.com/</a>)',
-        )
-
     def test_format_links_punctuation(self, *_):
-        """don’t take trailing punctuation into account pls"""
-        url = "http://www.fish.com/"
-        self.assertEqual(
-            views.status.format_links(f"{url}."),
-            f'<a href="{url}">www.fish.com/</a>.',
-        )
+        """test many combinations of brackets, URLs, and punctuation"""
+        url = "https://bookwyrm.social"
+        html = f'<a href="{url}">bookwyrm.social</a>'
+        test_table = [
+            ("punct", f"text and {url}.", f"text and {html}."),
+            ("multi_punct", f"text, then {url}?...", f"text, then {html}?..."),
+            ("bracket_punct", f"here ({url}).", f"here ({html})."),
+            ("punct_bracket", f"there [{url}?]", f"there [{html}?]"),
+            ("punct_bracket_punct", f"not here? ({url}!).", f"not here? ({html}!)."),
+            (
+                "multi_punct_bracket",
+                f"not there ({url}...);",
+                f"not there ({html}...);",
+            ),
+        ]
+        for desc, text, output in test_table:
+            with self.subTest(desc=desc):
+                self.assertEqual(views.status.format_links(text), output)
 
     def test_format_links_special_chars(self, *_):
         """find and format urls into a tags"""
@@ -464,6 +468,13 @@ http://www.fish.com/"""
             views.status.format_links(url), f'<a href="{url}">{url[8:]}</a>'
         )
 
+    def test_format_links_ignore_non_urls(self, *_):
+        """formating links should leave plain text untouced"""
+        text_elision = "> “The distinction is significant.” [...]"  # bookwyrm#2993
+        text_quoteparens = "some kind of gene-editing technology (?)"  # bookwyrm#3049
+        self.assertEqual(views.status.format_links(text_elision), text_elision)
+        self.assertEqual(views.status.format_links(text_quoteparens), text_quoteparens)
+
     def test_format_mentions_with_at_symbol_links(self, *_):
         """A link with an @username shouldn't treat the username as a mention"""
         content = "a link to https://example.com/user/@mouse"

bookwyrm/views/status.py

@@ -1,7 +1,6 @@
 """ what are we here for if not for posting """
 import re
 import logging
-from urllib.parse import urlparse
 
 from django.contrib.auth.decorators import login_required
 from django.core.validators import URLValidator
@@ -297,65 +296,51 @@ def find_or_create_hashtags(content):
 
 def format_links(content):
     """detect and format links"""
-    validator = URLValidator()
-    formatted_content = ""
+    validator = URLValidator(["http", "https"])
+    schema_re = re.compile(r"\bhttps?://")
     split_content = re.split(r"(\s+)", content)
 
-    for potential_link in split_content:
-        if not potential_link:
+    for i, potential_link in enumerate(split_content):
+        if not schema_re.search(potential_link):
             continue
-        wrapped = _wrapped(potential_link)
-        if wrapped:
-            wrapper_close = potential_link[-1]
-            formatted_content += potential_link[0]
-            potential_link = potential_link[1:-1]
-
-        ends_with_punctuation = _ends_with_punctuation(potential_link)
-        if ends_with_punctuation:
-            punctuation_glyph = potential_link[-1]
-            potential_link = potential_link[0:-1]
 
+        # Strip surrounding brackets and trailing punctuation.
+        prefix, potential_link, suffix = _unwrap(potential_link)
         try:
             # raises an error on anything that's not a valid link
             validator(potential_link)
 
             # use everything but the scheme in the presentation of the link
-            url = urlparse(potential_link)
-            link = url.netloc + url.path + url.params
-            if url.query != "":
-                link += "?" + url.query
-            if url.fragment != "":
-                link += "#" + url.fragment
-
-            formatted_content += f'<a href="{potential_link}">{link}</a>'
+            link = schema_re.sub("", potential_link)
+            split_content[i] = f'{prefix}<a href="{potential_link}">{link}</a>{suffix}'
         except (ValidationError, UnicodeError):
-            formatted_content += potential_link
+            pass
 
-        if wrapped:
-            formatted_content += wrapper_close
-
-        if ends_with_punctuation:
-            formatted_content += punctuation_glyph
-
-    return formatted_content
+    return "".join(split_content)
 
 
-def _wrapped(text):
-    """check if a line of text is wrapped"""
-    wrappers = [("(", ")"), ("[", "]"), ("{", "}")]
-    for wrapper in wrappers:
+def _unwrap(text):
+    """split surrounding brackets and trailing punctuation from a string of text"""
+    punct = re.compile(r'([.,;:!?"’”»]+)$')
+    prefix = suffix = ""
+
+    if punct.search(text):
+        # Move punctuation to suffix segment.
+        text, suffix, _ = punct.split(text)
+
+    for wrapper in ("()", "[]", "{}"):
         if text[0] == wrapper[0] and text[-1] == wrapper[-1]:
-            return True
-    return False
+            # Split out wrapping chars.
+            suffix = text[-1] + suffix
+            prefix, text = text[:1], text[1:-1]
+            break  # Nested wrappers not supported atm.
 
+    if punct.search(text):
+        # Move inner punctuation to suffix segment.
+        text, inner_punct, _ = punct.split(text)
+        suffix = inner_punct + suffix
 
-def _ends_with_punctuation(text):
-    """check if a line of text ends with a punctuation glyph"""
-    glyphs = [".", ",", ";", ":", "!", "?", "”", "’", '"', "»"]
-    for glyph in glyphs:
-        if text[-1] == glyph:
-            return True
-    return False
+    return prefix, text, suffix
 
 
 def to_markdown(content):