本文整理匯總了Python中lib2to3.pgen2.driver.Driver方法的典型用法代碼示例。如果您正苦於以下問題：Python driver.Driver方法的具體用法？Python driver.Driver怎麽用？Python driver.Driver使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類lib2to3.pgen2.driver的用法示例。
在下文中一共展示了driver.Driver方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: lib2to3_parse
# 需要導入模塊: from lib2to3.pgen2 import driver [as 別名]
# 或者: from lib2to3.pgen2.driver import Driver [as 別名]
def lib2to3_parse(src_txt):
"""Given a string with source, return the lib2to3 Node."""
grammar = pygram.python_grammar_no_print_statement
drv = driver.Driver(grammar, pytree.convert)
if src_txt[-1] != "\n":
nl = "\r\n" if "\r\n" in src_txt[:1024] else "\n"
src_txt += nl
try:
result = drv.parse_string(src_txt, True)
except ParseError as pe:
lineno, column = pe.context[1]
lines = src_txt.splitlines()
try:
faulty_line = lines[lineno - 1]
except IndexError:
faulty_line = "<line number missing in source>"
raise ValueError(f"Cannot parse: {lineno}:{column}: {faulty_line}") from None
if isinstance(result, Leaf):
result = Node(syms.file_input, [result])
return result 示例2: ParseCodeToTree
# 需要導入模塊: from lib2to3.pgen2 import driver [as 別名]
# 或者: from lib2to3.pgen2.driver import Driver [as 別名]
def ParseCodeToTree(code):
"""Parse the given code to a lib2to3 pytree.
Arguments:
code: a string with the code to parse.
Raises:
SyntaxError if the code is invalid syntax.
parse.ParseError if some other parsing failure.
Returns:
The root node of the parsed tree.
"""
# This function is tiny, but the incantation for invoking the parser correctly
# is sufficiently magical to be worth abstracting away.
try:
# Try to parse using a Python 3 grammar, which is more permissive (print and
# exec are not keywords).
parser_driver = driver.Driver(_GRAMMAR_FOR_PY3, convert=pytree.convert)
tree = parser_driver.parse_string(code, debug=False)
except parse.ParseError:
# Now try to parse using a Python 2 grammar; If this fails, then
# there's something else wrong with the code.
try:
parser_driver = driver.Driver(_GRAMMAR_FOR_PY2, convert=pytree.convert)
tree = parser_driver.parse_string(code, debug=False)
except parse.ParseError:
# Raise a syntax error if the code is invalid python syntax.
try:
ast.parse(code)
except SyntaxError as e:
raise e
else:
raise
return _WrapEndMarker(tree)