# HG changeset patch
# User Siddharth Agarwal <sid0@fb.com>
# Date 1405462485 25200
# Node ID 10e99839a7a4fd94fffae357216f03b3fafb1610
# Parent  50aad4609224ccc36dbe2d0117e3a481178c297b
util.re: add an escape method

The escape method in at least one of the modules called 're2' is in C. This
means it is significantly faster than the Python code written in 're'.

An upcoming patch will have benchmarks.

diff -r 50aad4609224 -r 10e99839a7a4 mercurial/util.py
--- a/mercurial/util.py	Tue Jul 15 15:01:52 2014 -0700
+++ b/mercurial/util.py	Tue Jul 15 15:14:45 2014 -0700
@@ -744,6 +744,21 @@
                 pass
         return remod.compile(pat, flags)
 
+    @propertycache
+    def escape(self):
+        '''Return the version of escape corresponding to self.compile.
+
+        This is imperfect because whether re2 or re is used for a particular
+        function depends on the flags, etc, but it's the best we can do.
+        '''
+        global _re2
+        if _re2 is None:
+            self._checkre2()
+        if _re2:
+            return re2.escape
+        else:
+            return remod.escape
+
 re = _re()
 
 _fspathcache = {}