From patchwork Fri Sep  6 09:35:35 2013
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Subject: [2, of, 4,
 V5] revset: add helper function to get functions used in a revset
 parse tree
From: Alexander Plavin <alexander@plav.in>
X-Patchwork-Id: 2394
Message-Id: <138d070c107576094931.1378460135@debian-alexander.dolgopa>
To: mercurial-devel@selenic.com
Date: Fri, 06 Sep 2013 13:35:35 +0400

# HG changeset patch
# User Alexander Plavin <alexander@plav.in>
# Date 1375824091 -14400
#      Wed Aug 07 01:21:31 2013 +0400
# Node ID 138d070c10757609493168d01da01b763e561f05
# Parent  e87a93bf4c2fb8229fe39acdfdfb54ba8736eef2
revset: add helper function to get functions used in a revset parse tree

Will be used to determine whether all functions used in a hgweb search query
are allowed there.

diff -r e87a93bf4c2f -r 138d070c1075 mercurial/revset.py
--- a/mercurial/revset.py	Fri Aug 09 22:52:58 2013 +0400
+++ b/mercurial/revset.py	Wed Aug 07 01:21:31 2013 +0400
@@ -1951,5 +1951,16 @@
     else:
         return 0
 
+def funcsused(tree):
+    if not isinstance(tree, tuple) or tree[0] in ('string', 'symbol'):
+        return set()
+    else:
+        funcs = set()
+        for s in tree[1:]:
+            funcs |= funcsused(s)
+        if tree[0] == 'func':
+            funcs.add(tree[1][1])
+        return funcs
+
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = symbols.values()