本文整理汇总了Python中lib2to3.pgen2.driver.Driver方法的典型用法代码示例。如果您正苦于以下问题：Python driver.Driver方法的具体用法？Python driver.Driver怎么用？Python driver.Driver使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类lib2to3.pgen2.driver的用法示例。
在下文中一共展示了driver.Driver方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: lib2to3_parse
# 需要导入模块: from lib2to3.pgen2 import driver [as 别名]
# 或者: from lib2to3.pgen2.driver import Driver [as 别名]
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
# 需要导入模块: from lib2to3.pgen2 import driver [as 别名]
# 或者: from lib2to3.pgen2.driver import Driver [as 别名]
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)