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""" Convert use of sys.exitfunc to use the atexit module. """ # Author: Benjamin Peterson from lib2to3 import pytree, fixer_base from lib2to3.fixer_util import Name, Attr, Call, Comma, Newline, syms class FixExitfunc(fixer_base.BaseFix): keep_line_order = True BM_compatible = True PATTERN = """ ( sys_import=import_name<'import' ('sys' | dotted_as_names< (any ',')* 'sys' (',' any)* > ) > | expr_stmt< power< 'sys' trailer< '.' 'exitfunc' > > '=' func=any > ) """ def __init__(self, *args): super(FixExitfunc, self).__init__(*args) def start_tree(self, tree, filename): super(FixExitfunc, self).start_tree(tree, filename) self.sys_import = None def transform(self, node, results): # First, find the sys import. We'll just hope it's global scope. if "sys_import" in results: if self.sys_import is None: self.sys_import = results["sys_import"] return func = results["func"].clone() func.prefix = "" register = pytree.Node(syms.power, Attr(Name("atexit"), Name("register")) ) call = Call(register, [func], node.prefix) node.replace(call) if self.sys_import is None: # That's interesting. self.warning(node, "Can't find sys import; Please add an atexit " "import at the top of your file.") return # Now add an atexit import after the sys import. names = self.sys_import.children[1] if names.type == syms.dotted_as_names: names.append_child(Comma()) names.append_child(Name("atexit", " ")) else: containing_stmt = self.sys_import.parent position = containing_stmt.children.index(self.sys_import) stmt_container = containing_stmt.parent new_import = pytree.Node(syms.import_name, [Name("import"), Name("atexit", " ")] ) new = pytree.Node(syms.simple_stmt, [new_import]) containing_stmt.insert_child(position + 1, Newline()) containing_stmt.insert_child(position + 2, new)