# HG changeset patch
# User Ludovic Chabant <ludovic@chabant.com>
# Date 1570212813 25200
# Node ID 10520472cc730afee824e2f1ba648fccdb2c5d1d
# Parent  c0c00dc1eac703a9b145d869fd533f3674aae08a
routing: Fix breakages with routing on some versions of Python.

Finally figured what happened with change 6baa94da8b16 (this is a Mercurial
hash by the way if you're looking at the Git mirror). Between Python 3.6 and
3.7 there was a change where the percent sign ('%') went from being escaped by
`re.escape` to _not_ being escaped. So now we need to use different regex
patterns dependin on the Python version, yay.

diff -r c0c00dc1eac7 -r 10520472cc73 piecrust/appconfig.py
--- a/piecrust/appconfig.py	Fri Oct 04 10:07:38 2019 -0700
+++ b/piecrust/appconfig.py	Fri Oct 04 11:13:33 2019 -0700
@@ -1,5 +1,6 @@
 import re
 import os.path
+import sys
 import copy
 import json
 import urllib
@@ -372,7 +373,8 @@
     cache.write('pagination_suffix_format', pgn_suffix_fmt)
 
     pgn_suffix_re = re.escape(v)
-    pgn_suffix_re = (pgn_suffix_re.replace("\\%num\\%", "(?P<num>\\d+)") +
+    escaped_token = "%num%" if sys.hexversion >= 0x3070000 else "\\%num\\%"
+    pgn_suffix_re = (pgn_suffix_re.replace(escaped_token, "(?P<num>\\d+)") +
                      '$')
     cache.write('pagination_suffix_re', pgn_suffix_re)
     return v
diff -r c0c00dc1eac7 -r 10520472cc73 piecrust/routing.py
--- a/piecrust/routing.py	Fri Oct 04 10:07:38 2019 -0700
+++ b/piecrust/routing.py	Fri Oct 04 11:13:33 2019 -0700
@@ -1,5 +1,6 @@
 import re
 import os.path
+import sys
 import copy
 import logging
 import urllib.parse
@@ -10,8 +11,13 @@
 
 
 route_re = re.compile(r'%((?P<qual>[\w\d]+):)?(?P<var>\+)?(?P<name>\w+)%')
-route_esc_re = re.compile(
-    r'%((?P<qual>[\w\d]+)\\:)?(?P<var>\\\+)?(?P<name>\w+)%')
+if sys.hexversion >= 0x3070000:
+    route_esc_re = re.compile(
+        r'%((?P<qual>[\w\d]+)\\:)?(?P<var>\\\+)?(?P<name>\w+)%')
+else:
+    route_esc_re = re.compile(
+        r'\\%((?P<qual>[\w\d]+)\\:)?(?P<var>\\\+)?(?P<name>\w+)\\%')
+
 ugly_url_cleaner = re.compile(r'\.html$')