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# 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")

_PATTERN_GRAMMAR_FILE = os.path.join(os.path.dirname(__file__),

"PatternGrammar.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.items():

setattr(self, name, symbol)

python_grammar = driver.load_packaged_grammar("lib2to3", _GRAMMAR_FILE)

python_symbols = Symbols(python_grammar)

python_grammar_no_print_statement = python_grammar.copy()

del python_grammar_no_print_statement.keywords["print"]

pattern_grammar = driver.load_packaged_grammar("lib2to3", _PATTERN_GRAMMAR_FILE)

pattern_symbols = Symbols(pattern_grammar)