From: Zac Medico <zmedico@gentoo.org>
Date: Sun, 25 Jul 2010 19:11:19 +0000 (-0700)
Subject: Make extended_cp_match() cache regular expressions for re-use.
X-Git-Tag: v2.2_rc68~459
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=636951ccdc6eeddf7776ef2ebcffbeb212fc9b46;p=portage.git

Make extended_cp_match() cache regular expressions for re-use.
---

diff --git a/pym/portage/dep/__init__.py b/pym/portage/dep/__init__.py
index 80e2b4c78..9720a510e 100644
--- a/pym/portage/dep/__init__.py
+++ b/pym/portage/dep/__init__.py
@@ -754,14 +754,20 @@ class Atom(_atom_base):
 		memo[id(self)] = self
 		return self
 
+_extended_cp_re_cache = {}
+
 def extended_cp_match(extended_cp, other_cp):
 	"""
 	Checks if an extended syntax cp matches a non extended cp
 	"""
 	# Escape special '+' and '.' characters which are allowed in atoms,
 	# and convert '*' to regex equivalent.
-	extended_cp_re = re.compile("^" + extended_cp.replace("+", r"\+").replace(
-		".", r"\.").replace('*', '[^/]*') + "$")
+	global _extended_cp_re_cache
+	extended_cp_re = _extended_cp_re_cache.get(extended_cp)
+	if extended_cp_re is None:
+		extended_cp_re = re.compile("^" + extended_cp.replace(
+			"+", r"\+").replace(".", r"\.").replace('*', '[^/]*') + "$")
+		_extended_cp_re_cache[extended_cp] = extended_cp_re
 	return extended_cp_re.match(other_cp) is not None
 
 class ExtendedAtomDict(object):