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99 lines
3.4 KiB
99 lines
3.4 KiB
"""Fixer for operator functions.
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operator.isCallable(obj) -> hasattr(obj, '__call__')
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operator.sequenceIncludes(obj) -> operator.contains(obj)
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operator.isSequenceType(obj) -> isinstance(obj, collections.Sequence)
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operator.isMappingType(obj) -> isinstance(obj, collections.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
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# Local imports
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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("hasattr(%s, '__call__')")
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def _isCallable(self, node, results):
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obj = results["obj"]
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args = [obj.clone(), String(", "), String("'__call__'")]
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return Call(Name("hasattr"), args, 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.Sequence)")
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def _isSequenceType(self, node, results):
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return self._handle_type2abc(node, results, "collections", "Sequence")
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@invocation("isinstance(%s, collections.Mapping)")
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def _isMappingType(self, node, results):
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return self._handle_type2abc(node, results, "collections", "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.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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