From b914e83041ec8f57f24ea199a7b8caf07cd5111f Mon Sep 17 00:00:00 2001
From: Brian Harring <ferringb@gentoo.org>
Date: Thu, 5 Jan 2006 05:33:25 +0000
Subject: 'k.  reverted use_reduce filtering of empty lists (was resulting in
 ["||"] as elements, which are invalid), added a recursive filter of empty
 sets/resolved || and && nodes; in the process, keeps portage from using an
 empty bool as a satisfier in || () restriction sets.

svn path=/main/trunk/; revision=2528
---
 pym/portage.py     | 20 ++++++++++++++++++++
 pym/portage_dep.py |  8 ++------
 2 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/pym/portage.py b/pym/portage.py
index 186555700..6105e0810 100644
--- a/pym/portage.py
+++ b/pym/portage.py
@@ -3374,6 +3374,26 @@ def dep_check(depstring,mydbapi,mysettings,use="yes",mode=None,myuse=None,use_ca
 	#if mysplit==None, then we have a parse error (paren mismatch or misplaced ||)
 	#up until here, we haven't needed to look at the database tree
 
+	# recursive cleansing of empty arrays.
+	# without this, portage eats itself if fed a || ()
+	def f(a):
+		x = 0
+		l = len(a)
+		while x < l:
+			if isinstance(a[x], list):
+				l2 = len(a[x])
+				if l2 == 0:
+					a.pop(x)
+				elif l2 == 1 and a[x][0] in ("||", "&&"):
+					a.pop(x)
+				else:
+					f(a[x])
+					x+=1
+					continue
+				l-=1
+			x+=1
+	f(mysplit)
+			
 	if mysplit==None:
 		return [0,"Parse Error (parentheses mismatch?)"]
 	elif mysplit==[]:
diff --git a/pym/portage_dep.py b/pym/portage_dep.py
index 5467e0055..de5c504cc 100644
--- a/pym/portage_dep.py
+++ b/pym/portage_dep.py
@@ -79,9 +79,7 @@ def use_reduce(deparray, uselist=[], masklist=[], matchall=0, excludeall=[]):
 		head = mydeparray.pop(0)
 
 		if type(head) == types.ListType:
-			additions = use_reduce(head, uselist, masklist, matchall, excludeall)
-			if additions:
-				rlist.append(additions)
+			rlist.append(use_reduce(head, uselist, masklist, matchall, excludeall))
 
 		else:
 			if head[-1] == "?": # Use reduce next group on fail.
@@ -124,9 +122,7 @@ def use_reduce(deparray, uselist=[], masklist=[], matchall=0, excludeall=[]):
 				if ismatch:
 					target = newdeparray[-1]
 					if isinstance(target, list):
-						additions = use_reduce(target, uselist, masklist, matchall, excludeall)
-						if additions:
-							rlist.append(additions)
+						rlist.append(use_reduce(target, uselist, masklist, matchall, excludeall))
 					else:
 						rlist += [target]
 
-- 
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