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fix_operator.py3.3 KB · 98 lines
"""Fixer for operator functions. operator.isCallable(obj)       -> callable(obj)operator.sequenceIncludes(obj) -> operator.contains(obj)operator.isSequenceType(obj)   -> isinstance(obj, collections.abc.Sequence)operator.isMappingType(obj)    -> isinstance(obj, collections.abc.Mapping)operator.isNumberType(obj)     -> isinstance(obj, numbers.Number)operator.repeat(obj, n)        -> operator.mul(obj, n)operator.irepeat(obj, n)       -> operator.imul(obj, n)""" import collections.abc # Local importsfrom lib2to3 import fixer_basefrom lib2to3.fixer_util import Call, Name, String, touch_import  def invocation(s):    def dec(f):        f.invocation = s        return f    return dec  class FixOperator(fixer_base.BaseFix):    BM_compatible = True    order = "pre"     methods = """              method=('isCallable'|'sequenceIncludes'                     |'isSequenceType'|'isMappingType'|'isNumberType'                     |'repeat'|'irepeat')              """    obj = "'(' obj=any ')'"    PATTERN = """              power< module='operator'                trailer< '.' %(methods)s > trailer< %(obj)s > >              |              power< %(methods)s trailer< %(obj)s > >              """ % dict(methods=methods, obj=obj)     def transform(self, node, results):        method = self._check_method(node, results)        if method is not None:            return method(node, results)     @invocation("operator.contains(%s)")    def _sequenceIncludes(self, node, results):        return self._handle_rename(node, results, "contains")     @invocation("callable(%s)")    def _isCallable(self, node, results):        obj = results["obj"]        return Call(Name("callable"), [obj.clone()], prefix=node.prefix)     @invocation("operator.mul(%s)")    def _repeat(self, node, results):        return self._handle_rename(node, results, "mul")     @invocation("operator.imul(%s)")    def _irepeat(self, node, results):        return self._handle_rename(node, results, "imul")     @invocation("isinstance(%s, collections.abc.Sequence)")    def _isSequenceType(self, node, results):        return self._handle_type2abc(node, results, "collections.abc", "Sequence")     @invocation("isinstance(%s, collections.abc.Mapping)")    def _isMappingType(self, node, results):        return self._handle_type2abc(node, results, "collections.abc", "Mapping")     @invocation("isinstance(%s, numbers.Number)")    def _isNumberType(self, node, results):        return self._handle_type2abc(node, results, "numbers", "Number")     def _handle_rename(self, node, results, name):        method = results["method"][0]        method.value = name        method.changed()     def _handle_type2abc(self, node, results, module, abc):        touch_import(None, module, node)        obj = results["obj"]        args = [obj.clone(), String(", " + ".".join([module, abc]))]        return Call(Name("isinstance"), args, prefix=node.prefix)     def _check_method(self, node, results):        method = getattr(self, "_" + results["method"][0].value)        if isinstance(method, collections.abc.Callable):            if "module" in results:                return method            else:                sub = (str(results["obj"]),)                invocation_str = method.invocation % sub                self.warning(node, "You should use '%s' here." % invocation_str)        return None