| 1 | """
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| 2 | Convert use of sys.exitfunc to use the atexit module.
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| 3 | """
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| 4 |
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| 5 | # Author: Benjamin Peterson
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| 6 |
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| 7 | from lib2to3 import pytree, fixer_base
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| 8 | from lib2to3.fixer_util import Name, Attr, Call, Comma, Newline, syms
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| 9 |
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| 10 |
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| 11 | class FixExitfunc(fixer_base.BaseFix):
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| 12 | keep_line_order = True
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| 13 | BM_compatible = True
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| 14 |
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| 15 | PATTERN = """
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| 16 | (
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| 17 | sys_import=import_name<'import'
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| 18 | ('sys'
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| 19 | |
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| 20 | dotted_as_names< (any ',')* 'sys' (',' any)* >
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| 21 | )
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| 22 | >
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| 23 | |
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| 24 | expr_stmt<
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| 25 | power< 'sys' trailer< '.' 'exitfunc' > >
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| 26 | '=' func=any >
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| 27 | )
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| 28 | """
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| 29 |
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| 30 | def __init__(self, *args):
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| 31 | super(FixExitfunc, self).__init__(*args)
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| 32 |
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| 33 | def start_tree(self, tree, filename):
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| 34 | super(FixExitfunc, self).start_tree(tree, filename)
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| 35 | self.sys_import = None
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| 36 |
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| 37 | def transform(self, node, results):
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| 38 | # First, find a the sys import. We'll just hope it's global scope.
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| 39 | if "sys_import" in results:
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| 40 | if self.sys_import is None:
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| 41 | self.sys_import = results["sys_import"]
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| 42 | return
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| 43 |
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| 44 | func = results["func"].clone()
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| 45 | func.prefix = u""
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| 46 | register = pytree.Node(syms.power,
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| 47 | Attr(Name(u"atexit"), Name(u"register"))
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| 48 | )
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| 49 | call = Call(register, [func], node.prefix)
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| 50 | node.replace(call)
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| 51 |
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| 52 | if self.sys_import is None:
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| 53 | # That's interesting.
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| 54 | self.warning(node, "Can't find sys import; Please add an atexit "
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| 55 | "import at the top of your file.")
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| 56 | return
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| 57 |
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| 58 | # Now add an atexit import after the sys import.
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| 59 | names = self.sys_import.children[1]
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| 60 | if names.type == syms.dotted_as_names:
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| 61 | names.append_child(Comma())
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| 62 | names.append_child(Name(u"atexit", u" "))
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| 63 | else:
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| 64 | containing_stmt = self.sys_import.parent
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| 65 | position = containing_stmt.children.index(self.sys_import)
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| 66 | stmt_container = containing_stmt.parent
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| 67 | new_import = pytree.Node(syms.import_name,
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| 68 | [Name(u"import"), Name(u"atexit", u" ")]
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| 69 | )
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| 70 | new = pytree.Node(syms.simple_stmt, [new_import])
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| 71 | containing_stmt.insert_child(position + 1, Newline())
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| 72 | containing_stmt.insert_child(position + 2, new)
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