# Copyright 2006 Google, Inc. All Rights Reserved.

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# Licensed to PSF under a Contributor Agreement.

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"""Export the Python grammar and symbols."""

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# Python imports

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import os

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# Local imports

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from .pgen2 import token

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from .pgen2 import driver

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from . import pytree

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# The grammar file

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_GRAMMAR_FILE = os.path.join(os.path.dirname(__file__), "Grammar.txt")

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

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"PatternGrammar.txt")

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class Symbols(object):

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def __init__(self, grammar):

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"""Initializer.

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Creates an attribute for each grammar symbol (nonterminal),

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whose value is the symbol's type (an int >= 256).

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"""

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for name, symbol in grammar.symbol2number.items():

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setattr(self, name, symbol)

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

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python_symbols = Symbols(python_grammar)

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python_grammar_no_print_statement = python_grammar.copy()

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del python_grammar_no_print_statement.keywords["print"]

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python_grammar_no_print_and_exec_statement = python_grammar_no_print_statement.copy()

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del python_grammar_no_print_and_exec_statement.keywords["exec"]

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

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pattern_symbols = Symbols(pattern_grammar)

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