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[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 python_grammar = driver.load_packaged_grammar("blib2to3", _GRAMMAR_FILE)
33
34 python_symbols = Symbols(python_grammar)
35
36 python_grammar_no_print_statement = python_grammar.copy()
37 del python_grammar_no_print_statement.keywords["print"]
38
39 python_grammar_no_exec_statement = python_grammar.copy()
40 del python_grammar_no_exec_statement.keywords["exec"]
41
42 python_grammar_no_print_statement_no_exec_statement = python_grammar.copy()
43 del python_grammar_no_print_statement_no_exec_statement.keywords["print"]
44 del python_grammar_no_print_statement_no_exec_statement.keywords["exec"]
45
46 pattern_grammar = driver.load_packaged_grammar("blib2to3", _PATTERN_GRAMMAR_FILE)
47 pattern_symbols = Symbols(pattern_grammar)