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pygram.py1.3 KB · 44 lines
# Copyright 2006 Google, Inc. All Rights Reserved.# Licensed to PSF under a Contributor Agreement. """Export the Python grammar and symbols.""" # Python importsimport os # Local importsfrom .pgen2 import tokenfrom .pgen2 import driverfrom . 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"] python_grammar_no_print_and_exec_statement = python_grammar_no_print_statement.copy()del python_grammar_no_print_and_exec_statement.keywords["exec"] pattern_grammar = driver.load_packaged_grammar("lib2to3", _PATTERN_GRAMMAR_FILE)pattern_symbols = Symbols(pattern_grammar)