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