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Editing: fix_annotations.py
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))
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