[PATCH 4 of 6 V2] match: extract function that group regexps

[Boris Feld]

# HG changeset patch
# User Boris Feld <boris.feld at octobus.net>
# Date 1542903949 -3600
#      Thu Nov 22 17:25:49 2018 +0100
# Node ID 4628c3cf1fc1052ca25296c8c1a42c4502b59dc9
# Parent  b702174979d09090d5e5081d09755cbb74540ff0
# EXP-Topic perf-ignore-2
# Available At https://bitbucket.org/octobus/mercurial-devel/
#              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 4628c3cf1fc1
match: extract function that group regexps

diff --git a/mercurial/match.py b/mercurial/match.py
--- a/mercurial/match.py
+++ b/mercurial/match.py
@@ -1186,6 +1186,10 @@ def _buildmatch(kindpats, globsuffix, li
 
 MAXRESIZE = 20000
 
+def _groupregexps(regexps):
+    """gather multiple regexps into a single one"""
+    return '(?:%s)' % '|'.join(regexps)
+
 def _buildregexmatch(kindpats, globsuffix):
     """Build a match function from a list of kinds and kindpats,
     return regexp string and a matcher function.
@@ -1199,8 +1203,8 @@ def _buildregexmatch(kindpats, globsuffi
     OverflowError
     """
     try:
-        regex = '(?:%s)' % '|'.join([_regex(k, p, globsuffix)
-                                     for (k, p, s) in kindpats])
+        regex = _groupregexps([_regex(k, p, globsuffix)
+                               for (k, p, s) in kindpats])
         if len(regex) > MAXRESIZE:
             raise OverflowError
         return regex, _rematcher(regex)