"""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 |