You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.3 KiB
44 lines
1.3 KiB
2 years ago
|
# 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"]
|
||
|
|
|
||
|
|
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)
|