From c09a58a7251f85d7c186d978b152e9c3d89d482d Mon Sep 17 00:00:00 2001
From: Caleb Deveraux <carrus85@gmail.com>
Date: Mon, 4 Oct 2010 14:26:16 +0800
Subject: [PATCH] Simplify mask construction to prevent unnecessary temporaries

---
 mclevel.py | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mclevel.py b/mclevel.py
index 0a318d1..e1851ed 100644
--- a/mclevel.py
+++ b/mclevel.py
@@ -111,6 +111,8 @@ Copyright 2010 David Rio Vierra
 """
 
 import nbt
+import operator
+import functools
 from nbt import *
 import gzip
 import StringIO
@@ -462,10 +464,7 @@ class MCLevel(object):
         
         blocks = self.Blocks[slices[0],slices[2],slices[1]]
         if blocksToReplace != None:
-            masks = map(lambda x:blocks==x, blocksToReplace);
-            mask = masks.pop();
-            while len(masks):
-                mask |= masks.pop();
+            mask = functools.reduce((blocks==x for x in blocksToReplace), operator.or_)
                 
             blocks[mask] = blockType;
             if hasattr(self, "Data"):