[PATCH 1 of 2 RFC] revset: added generatorset class with cached __contains__ method
Lucas Moscovicz
lmoscovicz at fb.com
Thu Feb 13 16:56:17 CST 2014
# HG changeset patch
# User Lucas Moscovicz <lmoscovicz at fb.com>
# Date 1391642591 28800
# Wed Feb 05 15:23:11 2014 -0800
# Node ID f4d973e19d267efa440d992583a860fc2f8eed98
# Parent 365b233e02ebf05d1b91e48d12f28f0c5ddd990c
revset: added generatorset class with cached __contains__ method
diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -2145,6 +2145,36 @@
def set(self):
return set([r for r in self])
+class generatorset(object):
+ def __init__(self, gen):
+ self._gen = gen
+ self._iter = iter(gen)
+ self._cache = {}
+
+ def __contains__(self, x):
+ if x in self._cache:
+ return self._cache[x]
+
+ while True:
+ try:
+ l = self._iter.next()
+ self._cache[l] = True
+ if l == x:
+ return True
+ except (StopIteration):
+ break
+
+ self._cache[x] = False
+ return False
+
+ def __iter__(self):
+ for item in self._gen:
+ self._cache[item] = True
+ yield item
+
+ def set(self):
+ return self
+
class spanset(object):
"""Duck type for baseset class which represents a range of revisions and
can work lazily and without having all the range in memory
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