lib-python.2.7.lib2to3.fixes.fix_exitfunc.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
"""
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 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 = u""
register = pytree.Node(syms.power,
Attr(Name(u"atexit"), Name(u"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(u"atexit", u" "))
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(u"import"), Name(u"atexit", u" ")]
)
new = pytree.Node(syms.simple_stmt, [new_import])
containing_stmt.insert_child(position + 1, Newline())
containing_stmt.insert_child(position + 2, new)