| """Fixer for operator functions. |
| |
| operator.isCallable(obj) -> hasattr(obj, '__call__') |
| operator.sequenceIncludes(obj) -> operator.contains(obj) |
| operator.isSequenceType(obj) -> isinstance(obj, collections.Sequence) |
| operator.isMappingType(obj) -> isinstance(obj, collections.Mapping) |
| operator.isNumberType(obj) -> isinstance(obj, numbers.Number) |
| operator.repeat(obj, n) -> operator.mul(obj, n) |
| operator.irepeat(obj, n) -> operator.imul(obj, n) |
| """ |
| |
| # Local imports |
| from lib2to3 import fixer_base |
| from 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, u"contains") |
| |
| @invocation("hasattr(%s, '__call__')") |
| def _isCallable(self, node, results): |
| obj = results["obj"] |
| args = [obj.clone(), String(u", "), String(u"'__call__'")] |
| return Call(Name(u"hasattr"), args, prefix=node.prefix) |
| |
| @invocation("operator.mul(%s)") |
| def _repeat(self, node, results): |
| return self._handle_rename(node, results, u"mul") |
| |
| @invocation("operator.imul(%s)") |
| def _irepeat(self, node, results): |
| return self._handle_rename(node, results, u"imul") |
| |
| @invocation("isinstance(%s, collections.Sequence)") |
| def _isSequenceType(self, node, results): |
| return self._handle_type2abc(node, results, u"collections", u"Sequence") |
| |
| @invocation("isinstance(%s, collections.Mapping)") |
| def _isMappingType(self, node, results): |
| return self._handle_type2abc(node, results, u"collections", u"Mapping") |
| |
| @invocation("isinstance(%s, numbers.Number)") |
| def _isNumberType(self, node, results): |
| return self._handle_type2abc(node, results, u"numbers", u"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(u", " + u".".join([module, abc]))] |
| return Call(Name(u"isinstance"), args, prefix=node.prefix) |
| |
| def _check_method(self, node, results): |
| method = getattr(self, "_" + results["method"][0].value.encode("ascii")) |
| if callable(method): |
| if "module" in results: |
| return method |
| else: |
| sub = (unicode(results["obj"]),) |
| invocation_str = unicode(method.invocation) % sub |
| self.warning(node, u"You should use '%s' here." % invocation_str) |
| return None |
