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