Ignore urls inside comments when checking links in stylesheets

src/calibre/ebooks/oeb/polish/container.py

@@ -31,7 +31,7 @@ from calibre.ebooks.oeb.base import (
     rewrite_links, iterlinks, itercsslinks, urlquote, urlunquote)
 from calibre.ebooks.oeb.polish.errors import InvalidBook, DRMError
 from calibre.ebooks.oeb.polish.parsing import parse as parse_html_tweak
-from calibre.ebooks.oeb.polish.utils import PositionFinder
+from calibre.ebooks.oeb.polish.utils import PositionFinder, CommentFinder
 from calibre.ebooks.oeb.parse_utils import NotHTML, parse_html, RECOVER_PARSER
 from calibre.ptempfile import PersistentTemporaryDirectory, PersistentTemporaryFile
 from calibre.utils.filenames import nlinks_file, hardlink_file
@@ -292,10 +292,12 @@ class Container(object):  # {{{
                 yield (link, el.sourceline, pos) if get_line_numbers else link
         elif media_type.lower() in OEB_STYLES:
             if get_line_numbers:
-                with self.open(name) as f:
+                with self.open(name, 'rb') as f:
                     raw = self.decode(f.read()).replace('\r\n', '\n').replace('\r', '\n')
                     position = PositionFinder(raw)
+                    is_in_comment = CommentFinder(raw)
                     for link, offset in itercsslinks(raw):
+                        if not is_in_comment(offset):
                             lnum, col = position(offset)
                             yield link, lnum, col
             else:

src/calibre/ebooks/oeb/polish/utils.py

@@ -22,3 +22,18 @@ class PositionFinder(object):
         except IndexError:
             offset = pos
         return (lnum + 1, offset)
+
+class CommentFinder(object):
+
+    def __init__(self, raw, pat=r'(?s)/\*.*?\*/'):
+        self.starts, self.ends = [], []
+        for m in re.finditer(pat, raw):
+            start, end = m.span()
+            self.starts.append(start), self.ends.append(end)
+
+    def __call__(self, offset):
+        if not self.starts:
+            return False
+        q = bisect(self.starts, offset) - 1
+        return q >= 0 and self.starts[q] <= offset <= self.ends[q]
+