diff mercurial/localrepo.py @ 41222:8aca89a694d4

revset: introduce an API that avoids `formatspec` input serialization

Instead of having the data fully serialized, the input can be directly inserted
in the tree at a later stage.

Just using it for simple "%ld" case provide a significant boost. For example
here are the impact on a sample discovery run between two pypy repositories
with arbitrary differences (using hg perfdiscovery).

$ hg perfdiscovery
before: ! wall 0.700435 comb 0.710000 user 0.700000 sys 0.010000 (median of 15)
after:  ! wall 0.501305 comb 0.510000 user 0.490000 sys 0.020000 (median of 20)

--- a/mercurial/localrepo.py	Fri Jan 04 05:26:13 2019 +0100
+++ b/mercurial/localrepo.py	Fri Jan 04 13:41:21 2019 +0100
@@ -1362,9 +1362,8 @@
         Returns a revset.abstractsmartset, which is a list-like interface
         that contains integer revisions.
         '''
-        expr = revsetlang.formatspec(expr, *args)
-        m = revset.match(None, expr)
-        return m(self)
+        tree = revsetlang.spectree(expr, *args)
+        return revset.makematcher(tree)(self)
 
     def set(self, expr, *args):
         '''Find revisions matching a revset and emit changectx instances.