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"""Fixer for operator functions. |
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operator.isCallable(obj) -> callable(obj) |
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operator.sequenceIncludes(obj) -> operator.contains(obj) |
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operator.isSequenceType(obj) -> isinstance(obj, collections.abc.Sequence) |
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operator.isMappingType(obj) -> isinstance(obj, collections.abc.Mapping) |
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operator.isNumberType(obj) -> isinstance(obj, numbers.Number) |
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operator.repeat(obj, n) -> operator.mul(obj, n) |
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operator.irepeat(obj, n) -> operator.imul(obj, n) |
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""" |
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import collections.abc |
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from lib2to3 import fixer_base |
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from lib2to3.fixer_util import Call, Name, String, touch_import |
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def invocation(s): |
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def dec(f): |
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f.invocation = s |
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return f |
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return dec |
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class FixOperator(fixer_base.BaseFix): |
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BM_compatible = True |
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order = "pre" |
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methods = """ |
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method=('isCallable'|'sequenceIncludes' |
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|'isSequenceType'|'isMappingType'|'isNumberType' |
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|'repeat'|'irepeat') |
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""" |
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obj = "'(' obj=any ')'" |
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PATTERN = """ |
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power< module='operator' |
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trailer< '.' %(methods)s > trailer< %(obj)s > > |
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power< %(methods)s trailer< %(obj)s > > |
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""" % dict(methods=methods, obj=obj) |
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def transform(self, node, results): |
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method = self._check_method(node, results) |
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if method is not None: |
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return method(node, results) |
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@invocation("operator.contains(%s)") |
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def _sequenceIncludes(self, node, results): |
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return self._handle_rename(node, results, "contains") |
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@invocation("callable(%s)") |
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def _isCallable(self, node, results): |
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obj = results["obj"] |
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return Call(Name("callable"), [obj.clone()], prefix=node.prefix) |
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@invocation("operator.mul(%s)") |
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def _repeat(self, node, results): |
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return self._handle_rename(node, results, "mul") |
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@invocation("operator.imul(%s)") |
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def _irepeat(self, node, results): |
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return self._handle_rename(node, results, "imul") |
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@invocation("isinstance(%s, collections.abc.Sequence)") |
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def _isSequenceType(self, node, results): |
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return self._handle_type2abc(node, results, "collections.abc", "Sequence") |
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@invocation("isinstance(%s, collections.abc.Mapping)") |
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def _isMappingType(self, node, results): |
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return self._handle_type2abc(node, results, "collections.abc", "Mapping") |
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@invocation("isinstance(%s, numbers.Number)") |
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def _isNumberType(self, node, results): |
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return self._handle_type2abc(node, results, "numbers", "Number") |
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def _handle_rename(self, node, results, name): |
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method = results["method"][0] |
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method.value = name |
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method.changed() |
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def _handle_type2abc(self, node, results, module, abc): |
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touch_import(None, module, node) |
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obj = results["obj"] |
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args = [obj.clone(), String(", " + ".".join([module, abc]))] |
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return Call(Name("isinstance"), args, prefix=node.prefix) |
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def _check_method(self, node, results): |
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method = getattr(self, "_" + results["method"][0].value) |
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if isinstance(method, collections.abc.Callable): |
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if "module" in results: |
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return method |
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else: |
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sub = (str(results["obj"]),) |
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invocation_str = method.invocation % sub |
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self.warning(node, "You should use '%s' here." % invocation_str) |
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return None |
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