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u"""
Fixer to remove function annotations
"""
from lib2to3 import fixer_base
from lib2to3.pgen2 import token
from lib2to3.fixer_util import syms
warning_text = u"Removing function annotations completely."
def param_without_annotations(node):
return node.children[0]
class FixAnnotations(fixer_base.BaseFix):
warned = False
def warn_once(self, node, reason):
if not self.warned:
self.warned = True
self.warning(node, reason=reason)
PATTERN = u"""
funcdef< 'def' any parameters< '(' [params=any] ')' > ['->' ret=any] ':' any* >
"""
def transform(self, node, results):
u"""
This just strips annotations from the funcdef completely.
"""
params = results.get(u"params")
ret = results.get(u"ret")
if ret is not None:
assert ret.prev_sibling.type == token.RARROW, u"Invalid return annotation"
self.warn_once(node, reason=warning_text)
ret.prev_sibling.remove()
ret.remove()
if params is None: return
if params.type == syms.typedargslist:
# more than one param in a typedargslist
for param in params.children:
if param.type == syms.tname:
self.warn_once(node, reason=warning_text)
param.replace(param_without_annotations(param))
elif params.type == syms.tname:
# one param
self.warn_once(node, reason=warning_text)
params.replace(param_without_annotations(params))