--- a/mercurial/revsetlang.py Fri Dec 22 22:19:42 2017 +0530
+++ b/mercurial/revsetlang.py Fri Dec 15 04:25:32 2017 +0530
@@ -661,3 +661,34 @@
if tree[0] == 'func':
funcs.add(tree[1][1])
return funcs
+
+_hashre = util.re.compile('[0-9a-fA-F]{1,40}$')
+
+def _ishashlikesymbol(symbol):
+ """returns true if the symbol looks like a hash"""
+ return _hashre.match(symbol)
+
+def gethashlikesymbols(tree):
+ """returns the list of symbols of the tree that look like hashes
+
+ >>> gethashlikesymbols(('dagrange', ('symbol', '3'), ('symbol', 'abe3ff')))
+ ['3', 'abe3ff']
+ >>> gethashlikesymbols(('func', ('symbol', 'precursors'), ('symbol', '.')))
+ []
+ >>> gethashlikesymbols(('func', ('symbol', 'precursors'), ('symbol', '34')))
+ ['34']
+ >>> gethashlikesymbols(('symbol', 'abe3ffZ'))
+ []
+ """
+ if not tree:
+ return []
+
+ if tree[0] == "symbol":
+ if _ishashlikesymbol(tree[1]):
+ return [tree[1]]
+ elif len(tree) >= 3:
+ results = []
+ for subtree in tree[1:]:
+ results += gethashlikesymbols(subtree)
+ return results
+ return []