merge 2to3 improvments
diff --git a/Lib/lib2to3/pgen2/grammar.py b/Lib/lib2to3/pgen2/grammar.py
index b7f867f..26caeb4 100644
--- a/Lib/lib2to3/pgen2/grammar.py
+++ b/Lib/lib2to3/pgen2/grammar.py
@@ -97,6 +97,19 @@
f.close()
self.__dict__.update(d)
+ def copy(self):
+ """
+ Copy the grammar.
+ """
+ new = self.__class__()
+ for dict_attr in ("symbol2number", "number2symbol", "dfas", "keywords",
+ "tokens", "symbol2label"):
+ setattr(new, dict_attr, getattr(self, dict_attr).copy())
+ new.labels = self.labels[:]
+ new.states = self.states[:]
+ new.start = self.start
+ return new
+
def report(self):
"""Dump the grammar tables to standard output, for debugging."""
from pprint import pprint