Merged revisions 61596-61597 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r61596 | martin.v.loewis | 2008-03-18 23:43:46 -0500 (Di, 18 Mär 2008) | 2 lines
Import lib2to3.
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r61597 | martin.v.loewis | 2008-03-18 23:58:04 -0500 (Di, 18 Mär 2008) | 3 lines
Initialized merge tracking via "svnmerge" with revisions "1-61595" from
svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3
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diff --git a/Lib/lib2to3/pygram.py b/Lib/lib2to3/pygram.py
new file mode 100644
index 0000000..24f1bcf
--- /dev/null
+++ b/Lib/lib2to3/pygram.py
@@ -0,0 +1,38 @@
+# Copyright 2006 Google, Inc. All Rights Reserved.
+# Licensed to PSF under a Contributor Agreement.
+
+"""Export the Python grammar and symbols."""
+
+# Python imports
+import os
+
+# Local imports
+from .pgen2 import token
+from .pgen2 import driver
+from . import pytree
+
+# The grammar file
+_GRAMMAR_FILE = os.path.join(os.path.dirname(__file__), "Grammar.txt")
+
+
+class Symbols(object):
+
+ def __init__(self, grammar):
+ """Initializer.
+
+ Creates an attribute for each grammar symbol (nonterminal),
+ whose value is the symbol's type (an int >= 256).
+ """
+ for name, symbol in grammar.symbol2number.iteritems():
+ setattr(self, name, symbol)
+
+
+python_grammar = driver.load_grammar(_GRAMMAR_FILE)
+python_symbols = Symbols(python_grammar)
+
+
+def parenthesize(node):
+ return pytree.Node(python_symbols.atom,
+ (pytree.Leaf(token.LPAR, "("),
+ node,
+ pytree.Leaf(token.RPAR, ")")))