Issue 7325 - Let the parser handle filters than begin and end with '%'

abp/filters/parser.py

 # This file is part of Adblock Plus <https://adblockplus.org/>,
 # Copyright (C) 2006-present eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ skipping 288 matching lines @@
             return Header(match.group(1))
 
     if stripped.startswith('!'):
         match = METADATA_REGEXP.match(line)
         if match:
             key, value = match.groups()
             if position != 'body' or key.lower() == 'checksum':
                 return Metadata(key, value)
         return Comment(stripped[1:].lstrip())
 
-    if stripped.startswith('%') and stripped.endswith('%'):
+    if stripped.startswith('%include') and stripped.endswith('%'):
         return _parse_instruction(stripped)
 
     return parse_filter(stripped)
 
 
 def parse_filterlist(lines):
     """Parse filter list from an iterable.
 
     Parameters
     ----------
@@ skipping 18 matching lines @@
     for line in lines:
         parsed_line = parse_line(line, position)
         yield parsed_line
 
         if position != 'body' and parsed_line.type in {'header', 'metadata'}:
             # Continue parsing metadata until it's over...
             position = 'metadata'
         else:
             # ...then switch to parsing the body.
             position = 'body'