# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1533123130 -7200
# Node ID 50aa090efd452af8f40d6815cdf9c5bacc0b9a3a
# Parent  0fa67bb2a7d92763eabffbd11ac95c33e240fcee
Added a convenience function for choices of patterns.

diff -r 0fa67bb2a7d9 -r 50aa090efd45 moinformat/parsers/common.py
--- a/moinformat/parsers/common.py	Wed Aug 01 13:25:22 2018 +0200
+++ b/moinformat/parsers/common.py	Wed Aug 01 13:32:10 2018 +0200
@@ -28,6 +28,12 @@
 ws_excl_nl = r"[ \f\r\t\v]"
 quotes = "['" '"]'              # ['"]
 
+def choice(l):
+
+    "Return a pattern matching a choice of patterns in 'l'."
+
+    return "(%s)" % "|".join(l)
+
 def excl(s):
 
     "Return a non-matching pattern for 's'."