redo grammar selection, add test (#765)

[etc/vim.git] / blib2to3 / pgen2 / grammar.py

diff --git a/blib2to3/pgen2/grammar.py b/blib2to3/pgen2/grammar.py
index a1da546eee20e12fc29d442835d80bea6379e40c..3ccf38ff9d80acc344ae6acbfb12433a9f9542bc 100644 (file)
--- a/blib2to3/pgen2/grammar.py
+++ b/blib2to3/pgen2/grammar.py
@@ -13,7 +13,9 @@ fallback token code OP, but the parser needs the actual token code.
 """
 
 # Python imports
 """
 
 # Python imports

+import os

 import pickle
 import pickle

+import tempfile

 
 # Local imports
 from . import token
 
 # Local imports
 from . import token


@@ -86,8 +88,9 @@ class Grammar(object):
 
     def dump(self, filename):
         """Dump the grammar tables to a pickle file."""
 
     def dump(self, filename):
         """Dump the grammar tables to a pickle file."""

-        with open(filename, "wb") as f:
+        with tempfile.NamedTemporaryFile(dir=os.path.dirname(filename), delete=False) as f:

             pickle.dump(self.__dict__, f, pickle.HIGHEST_PROTOCOL)
             pickle.dump(self.__dict__, f, pickle.HIGHEST_PROTOCOL)

+        os.replace(f.name, filename)

 
     def load(self, filename):
         """Load the grammar tables from a pickle file."""
 
     def load(self, filename):
         """Load the grammar tables from a pickle file."""