- Issue #11250: Back port fix from 3.3 branch, so that 2to3 can handle files

  with line feeds.  This was ported from the sandbox to the 3.3 branch, but
  didn't make it into 3.2.

- Re-enable lib2to3's test_parser.py tests, though with an expected failure
  (see issue 13125).

1 files changed, 2 insertions, 9 deletions

diff --git a/Lib/lib2to3/pgen2/driver.py b/Lib/lib2to3/pgen2/driver.py
index ee77a13..e7828ff 100644
--- a/Lib/lib2to3/pgen2/driver.py
+++ b/Lib/lib2to3/pgen2/driver.py
@@ -17,6 +17,7 @@ __all__ = ["Driver", "load_grammar"]
 
 # Python imports
 import codecs
+import io
 import os
 import logging
 import sys
@@ -101,18 +102,10 @@ class Driver(object):
 
     def parse_string(self, text, debug=False):
         """Parse a string and return the syntax tree."""
-        tokens = tokenize.generate_tokens(generate_lines(text).__next__)
+        tokens = tokenize.generate_tokens(io.StringIO(text).readline)
         return self.parse_tokens(tokens, debug)
 
 
-def generate_lines(text):
-    """Generator that behaves like readline without using StringIO."""
-    for line in text.splitlines(True):
-        yield line
-    while True:
-        yield ""
-
-
 def load_grammar(gt="Grammar.txt", gp=None,
                  save=True, force=False, logger=None):
     """Load the grammar (maybe from a pickle)."""