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fix handling of comments in from imports (#829)
[etc/vim.git] / blib2to3 / 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
7 import os
8
9 # Local imports
10 from .pgen2 import token
11 from .pgen2 import driver
12 from . import pytree
13
14 # The grammar file
15 _GRAMMAR_FILE = os.path.join(os.path.dirname(__file__), "Grammar.txt")
16 _PATTERN_GRAMMAR_FILE = os.path.join(os.path.dirname(__file__),
17                                      "PatternGrammar.txt")
18
19
20 class Symbols(object):
21
22     def __init__(self, grammar):
23         """Initializer.
24
25         Creates an attribute for each grammar symbol (nonterminal),
26         whose value is the symbol's type (an int >= 256).
27         """
28         for name, symbol in grammar.symbol2number.items():
29             setattr(self, name, symbol)
30
31
32 def initialize(cache_dir=None):
33     global python_grammar
34     global python_grammar_no_print_statement
35     global python_grammar_no_print_statement_no_exec_statement
36     global python_symbols
37     global pattern_grammar
38     global pattern_symbols
39
40     # Python 2
41     python_grammar = driver.load_packaged_grammar("blib2to3", _GRAMMAR_FILE,
42                                                   cache_dir)
43
44     python_symbols = Symbols(python_grammar)
45
46     # Python 2 + from __future__ import print_function
47     python_grammar_no_print_statement = python_grammar.copy()
48     del python_grammar_no_print_statement.keywords["print"]
49
50     # Python 3
51     python_grammar_no_print_statement_no_exec_statement = python_grammar.copy()
52     del python_grammar_no_print_statement_no_exec_statement.keywords["print"]
53     del python_grammar_no_print_statement_no_exec_statement.keywords["exec"]
54
55     pattern_grammar = driver.load_packaged_grammar("blib2to3", _PATTERN_GRAMMAR_FILE,
56                                                    cache_dir)
57     pattern_symbols = Symbols(pattern_grammar)