/Lib/lib2to3/pygram.py

 1# Copyright 2006 Google, Inc. All Rights Reserved.
 2# Licensed to PSF under a Contributor Agreement.
 3
 4"""Export the Python grammar and symbols."""
 5
 6# Python imports
 7import os
 8
 9# Local imports
10from .pgen2 import token
11from .pgen2 import driver
12from . import pytree
13
14# The grammar file
15_GRAMMAR_FILE = os.path.join(os.path.dirname(__file__), "Grammar.txt")
16
17
18class Symbols(object):
19
20    def __init__(self, grammar):
21        """Initializer.
22
23        Creates an attribute for each grammar symbol (nonterminal),
24        whose value is the symbol's type (an int >= 256).
25        """
26        for name, symbol in grammar.symbol2number.iteritems():
27            setattr(self, name, symbol)
28
29
30python_grammar = driver.load_grammar(_GRAMMAR_FILE)
31python_symbols = Symbols(python_grammar)