cpython/Lib/lib2to3/fixes/fix_exitfunc.py

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Merged revisions 79306,79311,79325 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ................ r79306 | benjamin.peterson | 2010-03-22 17:40:06 -0500 (Mon, 22 Mar 2010) | 21 lines Merged revisions 79077,79137,79304-79305 via svnmerge from svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r79077 | benjamin.peterson | 2010-03-18 18:05:29 -0500 (Thu, 18 Mar 2010) | 1 line port detect_encoding improvements from py3k ........ r79137 | benjamin.peterson | 2010-03-20 11:12:53 -0500 (Sat, 20 Mar 2010) | 1 line add a fixer for setting sys.exitfunc #2356 ........ r79304 | benjamin.peterson | 2010-03-22 17:20:22 -0500 (Mon, 22 Mar 2010) | 1 line fix test_parser when it's run in a path with spaces #7666 ........ r79305 | benjamin.peterson | 2010-03-22 17:27:07 -0500 (Mon, 22 Mar 2010) | 1 line normalize whitespace ........ ................ r79311 | benjamin.peterson | 2010-03-22 17:54:42 -0500 (Mon, 22 Mar 2010) | 9 lines Merged revisions 79309 via svnmerge from svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r79309 | benjamin.peterson | 2010-03-22 17:50:47 -0500 (Mon, 22 Mar 2010) | 1 line pass correct symbol in ........ ................ r79325 | benjamin.peterson | 2010-03-22 22:03:55 -0500 (Mon, 22 Mar 2010) | 13 lines Merged revisions 79313,79324 via svnmerge from svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r79313 | benjamin.peterson | 2010-03-22 17:59:57 -0500 (Mon, 22 Mar 2010) | 1 line another case where a symbol is needed ........ r79324 | benjamin.peterson | 2010-03-22 21:59:47 -0500 (Mon, 22 Mar 2010) | 1 line use unicode literals ........ ................
2010-03-23 00:22:05 -03:00
"""
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):
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 a 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)