# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1387597459 -32400
# Node ID 61a47fd64f308ecf18696f06f84918bef9564d7c
# Parent  d4be314b20711b6ecfa7a6f8b46970231134004a
fileset, revset: do not use global parser object for thread safety

parse() cannot be called at the same time because a parser object keeps its
states.  This is no problem for command-line hg client, but it would cause
strange errors in multi-threaded hgweb.

Creating parser object is not too expensive.

original:
% python -m timeit -s 'from mercurial import revset' 'revset.parse("0::tip")'
100000 loops, best of 3: 11.3 usec per loop

thread-safe:
% python -m timeit -s 'from mercurial import revset' 'revset.parse("0::tip")'
100000 loops, best of 3: 13.1 usec per loop

diff -r d4be314b2071 -r 61a47fd64f30 mercurial/fileset.py
--- a/mercurial/fileset.py	Wed Dec 04 13:42:28 2013 -0600
+++ b/mercurial/fileset.py	Sat Dec 21 12:44:19 2013 +0900
@@ -78,7 +78,9 @@
         pos += 1
     yield ('end', None, pos)
 
-parse = parser.parser(tokenize, elements).parse
+def parse(expr):
+    p = parser.parser(tokenize, elements)
+    return p.parse(expr)
 
 def getstring(x, err):
     if x and (x[0] == 'string' or x[0] == 'symbol'):
diff -r d4be314b2071 -r 61a47fd64f30 mercurial/revset.py
--- a/mercurial/revset.py	Wed Dec 04 13:42:28 2013 -0600
+++ b/mercurial/revset.py	Sat Dec 21 12:44:19 2013 +0900
@@ -1880,7 +1880,9 @@
         aliases[alias.name] = alias
     return _expandaliases(aliases, tree, [], {})
 
-parse = parser.parser(tokenize, elements).parse
+def parse(spec):
+    p = parser.parser(tokenize, elements)
+    return p.parse(spec)
 
 def match(ui, spec):
     if not spec: