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u"""
Fixer for "class Foo: ..." -> "class Foo(object): ..."
"""
from lib2to3 import fixer_base
from lib2to3.fixer_util import LParen, RParen, Name
from libfuturize.fixer_util import touch_import_top
def insert_object(node, idx):
node.insert_child(idx, RParen())
node.insert_child(idx, Name(u"object"))
node.insert_child(idx, LParen())
class FixNewstyle(fixer_base.BaseFix):
# Match:
# class Blah:
# and:
# class Blah():
PATTERN = u"classdef< 'class' NAME ['(' ')'] colon=':' any >"
def transform(self, node, results):
colon = results[u"colon"]
idx = node.children.index(colon)
if (node.children[idx-2].value == '(' and
node.children[idx-1].value == ')'):
del node.children[idx-2:idx]
idx -= 2
insert_object(node, idx)
touch_import_top(u'builtins', 'object', node)
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