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make PatternCompiler use the packaged grammar if possible (more bpo-24960) (#5034)

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Benjamin Peterson 2017-12-28 17:54:12 -08:00 committed by GitHub
parent e5681b9822
commit e5f7dccefa
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1 changed files with 7 additions and 7 deletions
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14
Lib/lib2to3/patcomp.py
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@ -21,10 +21,6 @@ from .pgen2 import driver, literals, token, tokenize, parse, grammar
from . import pytree
from . import pygram
# The pattern grammar file
_PATTERN_GRAMMAR_FILE = os.path.join(os.path.dirname(__file__),
"PatternGrammar.txt")
class PatternSyntaxError(Exception):
pass
@ -42,13 +38,17 @@ def tokenize_wrapper(input):
class PatternCompiler(object):
def __init__(self, grammar_file=_PATTERN_GRAMMAR_FILE):
def __init__(self, grammar_file=None):
"""Initializer.
Takes an optional alternative filename for the pattern grammar.
"""
self.grammar = driver.load_grammar(grammar_file)
self.syms = pygram.Symbols(self.grammar)
if grammar_file is None:
self.grammar = pygram.pattern_grammar
self.syms = pygram.pattern_symbols
else:
self.grammar = driver.load_grammar(grammar_file)
self.syms = pygram.Symbols(self.grammar)
self.pygrammar = pygram.python_grammar
self.pysyms = pygram.python_symbols
self.driver = driver.Driver(self.grammar, convert=pattern_convert)