def __init__(self, wrapped):
try:
wrapped.__name__
except AttributeError:
util.reraise(TypeError('%s must have a __name__ attribute'
% wrapped))
self.wrapped = wrapped
def igetattr(self, name, context=None):
"""inferred getattr"""
if not context:
context = contextmod.InferenceContext()
try:
# avoid recursively inferring the same attr on the same class
if context.push((self._proxied, name)):
return
# XXX frame should be self._proxied, or not ?
get_attr = self.getattr(name, context, lookupclass=False)
for stmt in _infer_stmts(self._wrap_attr(get_attr, context),
context,
frame=self):
yield stmt
except exceptions.AttributeInferenceError:
try:
# fallback to class.igetattr since it has some logic to handle
# descriptors
attrs = self._proxied.igetattr(name,
context,
class_context=False)
for stmt in self._wrap_attr(attrs, context):
yield stmt
except exceptions.AttributeInferenceError as error:
util.reraise(exceptions.InferenceError(**vars(error)))
def infer_subscript(self, context=None):
"""Inference for subscripts
We're understanding if the index is a Const
or a slice, passing the result of inference
to the value's `getitem` method, which should
handle each supported index type accordingly.
"""
value = next(self.value.infer(context))
if value is util.Uninferable:
yield util.Uninferable
return
index = next(self.slice.infer(context))
if index is util.Uninferable:
yield util.Uninferable
return
if value.__class__ == bases.Instance:
index_value = index
else:
index_value = _SLICE_SENTINEL
if isinstance(index, nodes.Const):
index_value = index.value
elif isinstance(index, nodes.Slice):
# Infer slices from the original object.
lower = _slice_value(index.lower, context)
upper = _slice_value(index.upper, context)
step = _slice_value(index.step, context)
if all(elem is not _SLICE_SENTINEL
for elem in (lower, upper, step)):
index_value = slice(lower, upper, step)
elif isinstance(index, bases.Instance):
index = helpers.class_instance_as_index(index)
if index:
index_value = index.value
else:
raise exceptions.InferenceError(node=self, context=context)
if index_value is _SLICE_SENTINEL:
raise exceptions.InferenceError(node=self, context=context)
try:
assigned = value.getitem(index_value, context)
except (IndexError, TypeError, AttributeError) as exc:
util.reraise(
exceptions.InferenceError(node=self, error=exc, context=context))
# Prevent inferring if the inferred subscript
# is the same as the original subscripted object.
if self is assigned or assigned is util.Uninferable:
yield util.Uninferable
return
for inferred in assigned.infer(context):
yield inferred
# Explicit StopIteration to return error information, see comment
# in raise_if_nothing_inferred.
raise StopIteration(dict(node=self, context=context))
def getattr(self, name, context=None, lookupclass=True):
try:
values = self._proxied.instance_attr(name, context)
except exceptions.AttributeInferenceError:
if self.special_attributes and name in self.special_attributes:
return [self.special_attributes.lookup(name)]
if lookupclass:
# Class attributes not available through the instance
# unless they are explicitly defined.
return self._proxied.getattr(name,
context,
class_context=False)
util.reraise(
exceptions.AttributeInferenceError(target=self,
attribute=name,
context=context))
# since we've no context information, return matching class members as
# well
if lookupclass:
try:
return values + self._proxied.getattr(
name, context, class_context=False)
except exceptions.AttributeInferenceError:
pass
return values
def _data_build(self, data, modname, path):
"""Build tree node from data and add some informations"""
try:
node = _parse(data + '\n')
except (TypeError, ValueError, SyntaxError) as exc:
util.reraise(
exceptions.AstroidSyntaxError(
'Parsing Python code failed:\n{error}',
source=data,
modname=modname,
path=path,
error=exc))
if path is not None:
node_file = os.path.abspath(path)
else:
node_file = '<?>'
if modname.endswith('.__init__'):
modname = modname[:-9]
package = True
else:
package = path and path.find('__init__.py') > -1 or False
builder = rebuilder.TreeRebuilder(self._manager)
module = builder.visit_module(node, modname, node_file, package)
module._import_from_nodes = builder._import_from_nodes
module._delayed_assattr = builder._delayed_assattr
return module
def __init__(self, wrapped):
try:
wrapped.__name__
except AttributeError:
util.reraise(
TypeError('%s must have a __name__ attribute' % wrapped))
self.wrapped = wrapped
def instance_getitem(self, index, context=None):
# Rewrap index to Const for this case
if context:
new_context = context.clone()
else:
context = new_context = contextmod.InferenceContext()
# Create a new callcontext for providing index as an argument.
new_context.callcontext = contextmod.CallContext(args=[index])
new_context.boundnode = self
method = next(self.igetattr('__getitem__', context=context))
if not isinstance(method, bases.BoundMethod):
raise exceptions.InferenceError(
'Could not find __getitem__ for {node!r}.',
node=self,
context=context)
try:
return next(method.infer_call_result(self, new_context))
except StopIteration:
util.reraise(
exceptions.InferenceError(
message='Inference for {node!r}[{index!s}] failed.',
node=self,
index=index,
context=context))
def infer_import_from(self, context=None, asname=True):
"""infer a ImportFrom node: return the imported module/object"""
name = context.lookupname
if name is None:
raise exceptions.InferenceError(node=self, context=context)
if asname:
name = self.real_name(name)
try:
module = self.do_import_module()
except exceptions.AstroidBuildingError as exc:
util.reraise(
exceptions.InferenceError(node=self, error=exc, context=context))
try:
context = contextmod.copy_context(context)
context.lookupname = name
stmts = module.getattr(name, ignore_locals=module is self.root())
return bases._infer_stmts(stmts, context)
except exceptions.AttributeInferenceError as error:
util.reraise(
exceptions.InferenceError(error.message,
target=self,
attribute=name,
context=context))
def ast_from_module_name(self, modname, context_file=None):
"""given a module name, return the astroid object"""
if modname in self.astroid_cache:
return self.astroid_cache[modname]
if modname == '__main__':
return self._build_stub_module(modname)
old_cwd = os.getcwd()
if context_file:
os.chdir(os.path.dirname(context_file))
try:
found_spec = self.file_from_module_name(modname, context_file)
# pylint: disable=no-member
if found_spec.type == spec.ModuleType.PY_ZIPMODULE:
# pylint: disable=no-member
module = self.zip_import_data(found_spec.location)
if module is not None:
return module
elif found_spec.type in (spec.ModuleType.C_BUILTIN,
spec.ModuleType.C_EXTENSION):
# pylint: disable=no-member
if (found_spec.type == spec.ModuleType.C_EXTENSION
and not self._can_load_extension(modname)):
return self._build_stub_module(modname)
try:
module = modutils.load_module_from_name(modname)
except Exception as ex: # pylint: disable=broad-except
util.reraise(exceptions.AstroidImportError(
'Loading {modname} failed with:\n{error}',
modname=modname, path=found_spec.location, error=ex))
return self.ast_from_module(module, modname)
elif found_spec.type == spec.ModuleType.PY_COMPILED:
raise exceptions.AstroidImportError(
"Unable to load compiled module {modname}.",
# pylint: disable=no-member
modname=modname, path=found_spec.location)
elif found_spec.type == spec.ModuleType.PY_NAMESPACE:
return self._build_namespace_module(modname,
# pylint: disable=no-member
found_spec.submodule_search_locations)
# pylint: disable=no-member
if found_spec.location is None:
raise exceptions.AstroidImportError(
"Can't find a file for module {modname}.",
modname=modname)
# pylint: disable=no-member
return self.ast_from_file(found_spec.location, modname, fallback=False)
except exceptions.AstroidBuildingError as e:
for hook in self._failed_import_hooks:
try:
return hook(modname)
except exceptions.AstroidBuildingError:
pass
raise e
finally:
os.chdir(old_cwd)
def ast_from_module_name(self, modname, context_file=None):
"""given a module name, return the astroid object"""
if modname in self.astroid_cache:
return self.astroid_cache[modname]
if modname == '__main__':
return self._build_stub_module(modname)
old_cwd = os.getcwd()
if context_file:
os.chdir(os.path.dirname(context_file))
try:
found_spec = self.file_from_module_name(modname, context_file)
# pylint: disable=no-member
if found_spec.type == spec.ModuleType.PY_ZIPMODULE:
# pylint: disable=no-member
module = self.zip_import_data(found_spec.location)
if module is not None:
return module
elif found_spec.type in (spec.ModuleType.C_BUILTIN,
spec.ModuleType.C_EXTENSION):
# pylint: disable=no-member
if (found_spec.type == spec.ModuleType.C_EXTENSION
and not self._can_load_extension(modname)):
return self._build_stub_module(modname)
try:
module = modutils.load_module_from_name(modname)
except Exception as ex: # pylint: disable=broad-except
util.reraise(exceptions.AstroidImportError(
'Loading {modname} failed with:\n{error}',
modname=modname, path=spec.location, error=ex))
return self.ast_from_module(module, modname)
elif found_spec.type == spec.ModuleType.PY_COMPILED:
raise exceptions.AstroidImportError(
"Unable to load compiled module {modname}.",
# pylint: disable=no-member
modname=modname, path=found_spec.location)
elif found_spec.type == spec.ModuleType.PY_NAMESPACE:
return self._build_namespace_module(modname,
# pylint: disable=no-member
found_spec.submodule_search_locations)
# pylint: disable=no-member
if found_spec.location is None:
raise exceptions.AstroidImportError(
"Can't find a file for module {modname}.",
modname=modname)
# pylint: disable=no-member
return self.ast_from_file(found_spec.location, modname, fallback=False)
except exceptions.AstroidBuildingError as e:
for hook in self._failed_import_hooks:
try:
return hook(modname)
except exceptions.AstroidBuildingError:
pass
raise e
finally:
os.chdir(old_cwd)
def getattr(self, name, context=None, lookupclass=True):
try:
values = self._proxied.instance_attr(name, context)
except exceptions.AttributeInferenceError:
if name == '__class__':
return [self._proxied]
if lookupclass:
# Class attributes not available through the instance
# unless they are explicitly defined.
if name in ('__name__', '__bases__', '__mro__', '__subclasses__'):
return self._proxied.local_attr(name)
return self._proxied.getattr(name, context,
class_context=False)
util.reraise(exceptions.AttributeInferenceError(target=self,
attribute=name,
context=context))
# since we've no context information, return matching class members as
# well
if lookupclass:
try:
return values + self._proxied.getattr(name, context,
class_context=False)
except exceptions.AttributeInferenceError:
pass
return values
def infer_subscript(self, context=None):
"""Inference for subscripts
We're understanding if the index is a Const
or a slice, passing the result of inference
to the value's `getitem` method, which should
handle each supported index type accordingly.
"""
value = next(self.value.infer(context))
if value is util.Uninferable:
yield util.Uninferable
return
index = next(self.slice.infer(context))
if index is util.Uninferable:
yield util.Uninferable
return
if value.__class__ == bases.Instance:
index_value = index
else:
index_value = _SLICE_SENTINEL
if isinstance(index, nodes.Const):
index_value = index.value
elif isinstance(index, nodes.Slice):
# Infer slices from the original object.
lower = _slice_value(index.lower, context)
upper = _slice_value(index.upper, context)
step = _slice_value(index.step, context)
if all(elem is not _SLICE_SENTINEL for elem in (lower, upper, step)):
index_value = slice(lower, upper, step)
elif isinstance(index, bases.Instance):
index = helpers.class_instance_as_index(index)
if index:
index_value = index.value
else:
raise exceptions.InferenceError(node=self, context=context)
if index_value is _SLICE_SENTINEL:
raise exceptions.InferenceError(node=self, context=context)
try:
assigned = value.getitem(index_value, context)
except (IndexError, TypeError, AttributeError) as exc:
util.reraise(exceptions.InferenceError(node=self, error=exc,
context=context))
# Prevent inferring if the inferred subscript
# is the same as the original subscripted object.
if self is assigned or assigned is util.Uninferable:
yield util.Uninferable
return
for inferred in assigned.infer(context):
yield inferred
# Explicit StopIteration to return error information, see comment
# in raise_if_nothing_inferred.
raise StopIteration(dict(node=self, context=context))
def parse(string, default=None):
string = string or default
try:
return tuple(int(v) for v in string.split('.'))
except ValueError:
util.reraise(
ValueError('%s is not a correct version : should be X.Y[.Z].' %
string))
def infer_global(self, context=None):
if context.lookupname is None:
raise exceptions.InferenceError(node=self, context=context)
try:
return bases._infer_stmts(self.root().getattr(context.lookupname),
context)
except exceptions.AttributeInferenceError as error:
util.reraise(exceptions.InferenceError(
error.message, target=self, attribute=name, context=context))
def infer_subscript(self, context=None):
"""Inference for subscripts
We're understanding if the index is a Const
or a slice, passing the result of inference
to the value's `getitem` method, which should
handle each supported index type accordingly.
"""
try:
value = next(self.value.infer(context))
except StopIteration:
return None
if value is util.Uninferable:
yield util.Uninferable
return None
try:
index = next(self.slice.infer(context))
except StopIteration:
return None
if index is util.Uninferable:
yield util.Uninferable
return None
# Try to deduce the index value.
index_value = _SUBSCRIPT_SENTINEL
if value.__class__ == bases.Instance:
index_value = index
else:
if index.__class__ == bases.Instance:
instance_as_index = helpers.class_instance_as_index(index)
if instance_as_index:
index_value = instance_as_index
else:
index_value = index
if index_value is _SUBSCRIPT_SENTINEL:
raise exceptions.InferenceError(node=self, context=context)
try:
assigned = value.getitem(index_value, context)
except (exceptions.AstroidTypeError, exceptions.AstroidIndexError,
exceptions.AttributeInferenceError, AttributeError) as exc:
util.reraise(
exceptions.InferenceError(node=self, error=exc, context=context))
# Prevent inferring if the inferred subscript
# is the same as the original subscripted object.
if self is assigned or assigned is util.Uninferable:
yield util.Uninferable
return None
for inferred in assigned.infer(context):
yield inferred
# Explicit StopIteration to return error information, see comment
# in raise_if_nothing_inferred.
return dict(node=self, context=context)
def with_assigned_stmts(self, node=None, context=None, asspath=None):
"""Infer names and other nodes from a *with* statement.
This enables only inference for name binding in a *with* statement.
For instance, in the following code, inferring `func` will return
the `ContextManager` class, not whatever ``__enter__`` returns.
We are doing this intentionally, because we consider that the context
manager result is whatever __enter__ returns and what it is binded
using the ``as`` keyword.
class ContextManager(object):
def __enter__(self):
return 42
with ContextManager() as f:
pass
# ContextManager().infer() will return ContextManager
# f.infer() will return 42.
Arguments:
self: nodes.With
node: The target of the assignment, `as (a, b)` in `with foo as (a, b)`.
context: TODO
asspath: TODO
"""
mgr = next(mgr for (mgr, vars) in self.items if vars == node)
if asspath is None:
for result in _infer_context_manager(self, mgr, context):
yield result
else:
for result in _infer_context_manager(self, mgr, context):
# Walk the asspath and get the item at the final index.
obj = result
for index in asspath:
if not hasattr(obj, 'elts'):
raise exceptions.InferenceError(
'Wrong type ({targets!r}) for {node!r} assignment',
node=self, targets=node, assign_path=asspath,
context=context)
try:
obj = obj.elts[index]
except IndexError:
util.reraise(exceptions.InferenceError(
'Tried to infer a nonexistent target with index {index} '
'in {node!r}.', node=self, targets=node,
assign_path=asspath, context=context))
except TypeError:
util.reraise(exceptions.InferenceError(
'Tried to unpack an non-iterable value '
'in {node!r}.', node=self, targets=node,
assign_path=asspath, context=context))
yield obj
# Explicit StopIteration to return error information, see comment
# in raise_if_nothing_inferred.
raise StopIteration(dict(node=self, unknown=node,
assign_path=asspath, context=context))
def with_assigned_stmts(self, node=None, context=None, asspath=None):
"""Infer names and other nodes from a *with* statement.
This enables only inference for name binding in a *with* statement.
For instance, in the following code, inferring `func` will return
the `ContextManager` class, not whatever ``__enter__`` returns.
We are doing this intentionally, because we consider that the context
manager result is whatever __enter__ returns and what it is binded
using the ``as`` keyword.
class ContextManager(object):
def __enter__(self):
return 42
with ContextManager() as f:
pass
# ContextManager().infer() will return ContextManager
# f.infer() will return 42.
Arguments:
self: nodes.With
node: The target of the assignment, `as (a, b)` in `with foo as (a, b)`.
context: TODO
asspath: TODO
"""
mgr = next(mgr for (mgr, vars) in self.items if vars == node)
if asspath is None:
for result in _infer_context_manager(self, mgr, context):
yield result
else:
for result in _infer_context_manager(self, mgr, context):
# Walk the asspath and get the item at the final index.
obj = result
for index in asspath:
if not hasattr(obj, 'elts'):
raise exceptions.InferenceError(
'Wrong type ({targets!r}) for {node!r} assignment',
node=self,
targets=node,
assign_path=asspath,
context=context)
try:
obj = obj.elts[index]
except IndexError:
util.reraise(
exceptions.InferenceError(
'Tried to infer a nonexistent target with index {index} '
'in {node!r}.',
node=self,
targets=node,
assign_path=asspath,
context=context))
yield obj
# Explicit StopIteration to return error information, see comment
# in raise_if_nothing_inferred.
raise StopIteration(
dict(node=self, unknown=node, assign_path=asspath, context=context))
def infer_global(self, context=None):
if context.lookupname is None:
raise exceptions.InferenceError(node=self, context=context)
try:
return bases._infer_stmts(self.root().getattr(context.lookupname),
context)
except exceptions.AttributeInferenceError as error:
util.reraise(exceptions.InferenceError(
error.message, target=self, attribute=context.lookupname,
context=context))
def ast_from_class(self, klass, modname=None):
"""get astroid for the given class"""
if modname is None:
try:
modname = klass.__module__
except AttributeError:
util.reraise(exceptions.AstroidBuildingError(
'Unable to get module for class {class_name}.',
cls=klass, class_repr=safe_repr(klass), modname=modname))
modastroid = self.ast_from_module_name(modname)
return modastroid.getattr(klass.__name__)[0] # XXX
def ast_from_class(self, klass, modname=None):
"""get astroid for the given class"""
if modname is None:
try:
modname = klass.__module__
except AttributeError:
util.reraise(exceptions.AstroidBuildingError(
'Unable to get module for class {class_name}.',
cls=klass, class_repr=safe_repr(klass), modname=modname))
modastroid = self.ast_from_module_name(modname)
return modastroid.getattr(klass.__name__)[0] # XXX
def sequence_assigned_stmts(self, node=None, context=None, asspath=None):
if asspath is None:
asspath = []
try:
index = self.elts.index(node)
except ValueError:
util.reraise(exceptions.InferenceError(
'Tried to retrieve a node {node!r} which does not exist',
node=self, assign_path=asspath, context=context))
asspath.insert(0, index)
return self.parent.assigned_stmts(node=self, context=context, asspath=asspath)
def sequence_assigned_stmts(self, node=None, context=None, asspath=None):
if asspath is None:
asspath = []
try:
index = self.elts.index(node)
except ValueError:
util.reraise(exceptions.InferenceError(
'Tried to retrieve a node {node!r} which does not exist',
node=self, assign_path=asspath, context=context))
asspath.insert(0, index)
return self.parent.assigned_stmts(node=self, context=context, asspath=asspath)
def infer_subscript(self, context=None):
"""Inference for subscripts
We're understanding if the index is a Const
or a slice, passing the result of inference
to the value's `getitem` method, which should
handle each supported index type accordingly.
"""
value = next(self.value.infer(context))
if value is util.Uninferable:
yield util.Uninferable
return
index = next(self.slice.infer(context))
if index is util.Uninferable:
yield util.Uninferable
return
# Try to deduce the index value.
index_value = _SUBSCRIPT_SENTINEL
if value.__class__ == bases.Instance:
index_value = index
else:
if index.__class__ == bases.Instance:
instance_as_index = helpers.class_instance_as_index(index)
if instance_as_index:
index_value = instance_as_index
else:
index_value = index
if index_value is _SUBSCRIPT_SENTINEL:
raise exceptions.InferenceError(node=self, context=context)
try:
assigned = value.getitem(index_value, context)
except (exceptions.AstroidTypeError,
exceptions.AstroidIndexError,
exceptions.AttributeInferenceError,
AttributeError) as exc:
util.reraise(exceptions.InferenceError(node=self, error=exc,
context=context))
# Prevent inferring if the inferred subscript
# is the same as the original subscripted object.
if self is assigned or assigned is util.Uninferable:
yield util.Uninferable
return
for inferred in assigned.infer(context):
yield inferred
# Explicit StopIteration to return error information, see comment
# in raise_if_nothing_inferred.
raise StopIteration(dict(node=self, context=context))
def igetattr(self, name, context=None):
"""Retrieve the inferred values of the given attribute name."""
local_name = self._model.get(name)
if local_name:
yield local_name
return
try:
mro = self.super_mro()
# Don't let invalid MROs or invalid super calls
# leak out as is from this function.
except exceptions.SuperError as exc:
util.reraise(exceptions.AttributeInferenceError(
('Lookup for {name} on {target!r} because super call {super!r} '
'is invalid.'),
target=self, attribute=name, context=context, super_=exc.super_))
except exceptions.MroError as exc:
util.reraise(exceptions.AttributeInferenceError(
('Lookup for {name} on {target!r} failed because {cls!r} has an '
'invalid MRO.'),
target=self, attribute=name, context=context, mros=exc.mros,
cls=exc.cls))
found = False
for cls in mro:
if name not in cls.locals:
continue
found = True
for inferred in bases._infer_stmts([cls[name]], context, frame=self):
if not isinstance(inferred, scoped_nodes.FunctionDef):
yield inferred
continue
# We can obtain different descriptors from a super depending
# on what we are accessing and where the super call is.
if inferred.type == 'classmethod':
yield bases.BoundMethod(inferred, cls)
elif self._scope.type == 'classmethod' and inferred.type == 'method':
yield inferred
elif self._class_based or inferred.type == 'staticmethod':
yield inferred
elif bases._is_property(inferred):
# TODO: support other descriptors as well.
for value in inferred.infer_call_result(self, context):
yield value
else:
yield bases.BoundMethod(inferred, cls)
if not found:
raise exceptions.AttributeInferenceError(target=self,
attribute=name,
context=context)
def igetattr(self, name, context=None):
"""Retrieve the inferred values of the given attribute name."""
if name in self.special_attributes:
yield self.special_attributes.lookup(name)
return
try:
mro = self.super_mro()
# Don't let invalid MROs or invalid super calls
# leak out as is from this function.
except exceptions.SuperError as exc:
util.reraise(exceptions.AttributeInferenceError(
('Lookup for {name} on {target!r} because super call {super!r} '
'is invalid.'),
target=self, attribute=name, context=context, super_=exc.super_))
except exceptions.MroError as exc:
util.reraise(exceptions.AttributeInferenceError(
('Lookup for {name} on {target!r} failed because {cls!r} has an '
'invalid MRO.'),
target=self, attribute=name, context=context, mros=exc.mros,
cls=exc.cls))
found = False
for cls in mro:
if name not in cls.locals:
continue
found = True
for inferred in bases._infer_stmts([cls[name]], context, frame=self):
if not isinstance(inferred, scoped_nodes.FunctionDef):
yield inferred
continue
# We can obtain different descriptors from a super depending
# on what we are accessing and where the super call is.
if inferred.type == 'classmethod':
yield bases.BoundMethod(inferred, cls)
elif self._scope.type == 'classmethod' and inferred.type == 'method':
yield inferred
elif self._class_based or inferred.type == 'staticmethod':
yield inferred
elif bases._is_property(inferred):
# TODO: support other descriptors as well.
for value in inferred.infer_call_result(self, context):
yield value
else:
yield bases.BoundMethod(inferred, cls)
if not found:
raise exceptions.AttributeInferenceError(target=self,
attribute=name,
context=context)
def infer_ast_from_something(self, obj, context=None):
"""infer astroid for the given class"""
if hasattr(obj, '__class__') and not isinstance(obj, type):
klass = obj.__class__
else:
klass = obj
try:
modname = klass.__module__
except AttributeError:
util.reraise(exceptions.AstroidBuildingError(
'Unable to get module for {class_repr}.',
cls=klass, class_repr=safe_repr(klass)))
except Exception as ex: # pylint: disable=broad-except
util.reraise(exceptions.AstroidImportError(
'Unexpected error while retrieving module for {class_repr}:\n'
'{error}', cls=klass, class_repr=safe_repr(klass), error=ex))
try:
name = klass.__name__
except AttributeError:
util.reraise(exceptions.AstroidBuildingError(
'Unable to get name for {class_repr}:\n',
cls=klass, class_repr=safe_repr(klass)))
except Exception as ex: # pylint: disable=broad-except
util.reraise(exceptions.AstroidImportError(
'Unexpected error while retrieving name for {class_repr}:\n'
'{error}', cls=klass, class_repr=safe_repr(klass), error=ex))
# take care, on living object __module__ is regularly wrong :(
modastroid = self.ast_from_module_name(modname)
if klass is obj:
for inferred in modastroid.igetattr(name, context):
yield inferred
else:
for inferred in modastroid.igetattr(name, context):
yield inferred.instantiate_class()
def infer_import(self, context=None, asname=True):
"""infer an Import node: return the imported module/object"""
name = context.lookupname
if name is None:
raise exceptions.InferenceError(node=self, context=context)
try:
if asname:
yield self.do_import_module(self.real_name(name))
else:
yield self.do_import_module(name)
except exceptions.AstroidBuildingError as exc:
util.reraise(exceptions.InferenceError(node=self, error=exc,
context=context))
def infer_ast_from_something(self, obj, context=None):
"""infer astroid for the given class"""
if hasattr(obj, '__class__') and not isinstance(obj, type):
klass = obj.__class__
else:
klass = obj
try:
modname = klass.__module__
except AttributeError:
util.reraise(exceptions.AstroidBuildingError(
'Unable to get module for {class_repr}.',
cls=klass, class_repr=safe_repr(klass)))
except Exception as ex: # pylint: disable=broad-except
util.reraise(exceptions.AstroidImportError(
'Unexpected error while retrieving module for {class_repr}:\n'
'{error}', cls=klass, class_repr=safe_repr(klass), error=ex))
try:
name = klass.__name__
except AttributeError:
util.reraise(exceptions.AstroidBuildingError(
'Unable to get name for {class_repr}:\n',
cls=klass, class_repr=safe_repr(klass)))
except Exception as ex: # pylint: disable=broad-except
util.reraise(exceptions.AstroidImportError(
'Unexpected error while retrieving name for {class_repr}:\n'
'{error}', cls=klass, class_repr=safe_repr(klass), error=ex))
# take care, on living object __module__ is regularly wrong :(
modastroid = self.ast_from_module_name(modname)
if klass is obj:
for inferred in modastroid.igetattr(name, context):
yield inferred
else:
for inferred in modastroid.igetattr(name, context):
yield inferred.instantiate_class()
def infer_import(self, context=None, asname=True):
"""infer an Import node: return the imported module/object"""
name = context.lookupname
if name is None:
raise exceptions.InferenceError(node=self, context=context)
try:
if asname:
yield self.do_import_module(self.real_name(name))
else:
yield self.do_import_module(name)
except exceptions.AstroidBuildingError as exc:
util.reraise(
exceptions.InferenceError(node=self, error=exc, context=context))
def ast_from_module_name(self, modname, context_file=None):
"""given a module name, return the astroid object"""
if modname in self.astroid_cache:
return self.astroid_cache[modname]
if modname == '__main__':
return self._build_stub_module(modname)
old_cwd = os.getcwd()
if context_file:
os.chdir(os.path.dirname(context_file))
try:
filepath, mp_type = self.file_from_module_name(
modname, context_file)
if mp_type == modutils.PY_ZIPMODULE:
module = self.zip_import_data(filepath)
if module is not None:
return module
elif mp_type in (imp.C_BUILTIN, imp.C_EXTENSION):
if mp_type == imp.C_EXTENSION and not self._can_load_extension(
modname):
return self._build_stub_module(modname)
try:
module = modutils.load_module_from_name(modname)
except Exception as ex: # pylint: disable=broad-except
util.reraise(
exceptions.AstroidImportError(
'Loading {modname} failed with:\n{error}',
modname=modname,
path=filepath,
error=ex))
return self.ast_from_module(module, modname)
elif mp_type == imp.PY_COMPILED:
raise exceptions.AstroidImportError(
"Unable to load compiled module {modname}.",
modname=modname,
path=filepath)
if filepath is None:
raise exceptions.AstroidImportError(
"Can't find a file for module {modname}.", modname=modname)
return self.ast_from_file(filepath, modname, fallback=False)
except exceptions.AstroidBuildingError as e:
for hook in self._failed_import_hooks:
try:
return hook(modname)
except exceptions.AstroidBuildingError:
pass
raise e
finally:
os.chdir(old_cwd)
def ast_from_module_name(self, modname, context_file=None):
"""given a module name, return the astroid object"""
if modname in self.astroid_cache:
return self.astroid_cache[modname]
if modname == '__main__':
return self._build_stub_module(modname)
old_cwd = os.getcwd()
if context_file:
os.chdir(os.path.dirname(context_file))
try:
filepath, mp_type = self.file_from_module_name(modname, context_file)
if mp_type == modutils.PY_ZIPMODULE:
module = self.zip_import_data(filepath)
if module is not None:
return module
elif mp_type in (imp.C_BUILTIN, imp.C_EXTENSION):
if mp_type == imp.C_EXTENSION and not self._can_load_extension(modname):
return self._build_stub_module(modname)
try:
module = modutils.load_module_from_name(modname)
except Exception as ex: # pylint: disable=broad-except
util.reraise(exceptions.AstroidImportError(
'Loading {modname} failed with:\n{error}',
modname=modname, path=filepath, error=ex))
return self.ast_from_module(module, modname)
elif mp_type == imp.PY_COMPILED:
raise exceptions.AstroidImportError(
"Unable to load compiled module {modname}.",
modname=modname, path=filepath)
if filepath is None:
raise exceptions.AstroidImportError(
"Can't find a file for module {modname}.",
modname=modname)
return self.ast_from_file(filepath, modname, fallback=False)
except exceptions.AstroidBuildingError as e:
for hook in self._failed_import_hooks:
try:
return hook(modname)
except exceptions.AstroidBuildingError:
pass
raise e
finally:
os.chdir(old_cwd)
def _data_build(data, modname, path):
"""Build tree node from data and add some informations"""
try:
node = _parse(data + '\n')
except (TypeError, ValueError, SyntaxError) as exc:
util.reraise(exceptions.AstroidSyntaxError(
'Parsing Python code failed:\n{error}',
source=data, modname=modname, path=path, error=exc))
if path is not None:
node_file = os.path.abspath(path)
else:
node_file = '<?>'
if modname.endswith('.__init__'):
modname = modname[:-9]
package = True
else:
package = path and path.find('__init__.py') > -1 or False
builder = rebuilder.TreeRebuilder()
module = builder.visit_module(node, modname, node_file, package)
return module
def file_build(self, path, modname=None):
"""Build astroid from a source code file (i.e. from an ast)
*path* is expected to be a python source file
"""
try:
stream, encoding, data = open_source_file(path)
except IOError as exc:
util.reraise(exceptions.AstroidBuildingError(
'Unable to load file {path}:\n{error}',
modname=modname, path=path, error=exc))
except (SyntaxError, LookupError) as exc:
util.reraise(exceptions.AstroidSyntaxError(
'Python 3 encoding specification error or unknown encoding:\n'
'{error}', modname=modname, path=path, error=exc))
except UnicodeError: # wrong encoding
# detect_encoding returns utf-8 if no encoding specified
util.reraise(exceptions.AstroidBuildingError(
'Wrong or no encoding specified for {filename}.',
filename=path))
with stream:
# get module name if necessary
if modname is None:
try:
modname = '.'.join(modutils.modpath_from_file(path))
except ImportError:
modname = os.path.splitext(os.path.basename(path))[0]
# build astroid representation
module = self._data_build(data, modname, path)
return self._post_build(module, encoding)
def file_build(self, path, modname=None):
"""Build astroid from a source code file (i.e. from an ast)
*path* is expected to be a python source file
"""
try:
stream, encoding, data = open_source_file(path)
except IOError as exc:
util.reraise(exceptions.AstroidBuildingError(
'Unable to load file {path}:\n{error}',
modname=modname, path=path, error=exc))
except (SyntaxError, LookupError) as exc:
util.reraise(exceptions.AstroidSyntaxError(
'Python 3 encoding specification error or unknown encoding:\n'
'{error}', modname=modname, path=path, error=exc))
except UnicodeError: # wrong encoding
# detect_encoding returns utf-8 if no encoding specified
util.reraise(exceptions.AstroidBuildingError(
'Wrong or no encoding specified for {filename}.',
filename=path))
with stream:
# get module name if necessary
if modname is None:
try:
modname = '.'.join(modutils.modpath_from_file(path))
except ImportError:
modname = os.path.splitext(os.path.basename(path))[0]
# build astroid representation
module = self._data_build(data, modname, path)
return self._post_build(module, encoding)
def _data_build(self, data, modname, path):
"""Build tree node from data and add some informations"""
try:
node = _parse(data + '\n')
except (TypeError, ValueError, SyntaxError) as exc:
util.reraise(exceptions.AstroidSyntaxError(
'Parsing Python code failed:\n{error}',
source=data, modname=modname, path=path, error=exc))
if path is not None:
node_file = os.path.abspath(path)
else:
node_file = '<?>'
if modname.endswith('.__init__'):
modname = modname[:-9]
package = True
else:
package = path is not None and os.path.splitext(os.path.basename(path))[0] == '__init__'
builder = rebuilder.TreeRebuilder(self._manager)
module = builder.visit_module(node, modname, node_file, package)
module._import_from_nodes = builder._import_from_nodes
module._delayed_assattr = builder._delayed_assattr
return module
def infer_import_from(self, context=None, asname=True):
"""infer a ImportFrom node: return the imported module/object"""
name = context.lookupname
if name is None:
raise exceptions.InferenceError(node=self, context=context)
if asname:
name = self.real_name(name)
try:
module = self.do_import_module()
except exceptions.AstroidBuildingError as exc:
util.reraise(exceptions.InferenceError(node=self, error=exc,
context=context))
try:
context = contextmod.copy_context(context)
context.lookupname = name
stmts = module.getattr(name, ignore_locals=module is self.root())
return bases._infer_stmts(stmts, context)
except exceptions.AttributeInferenceError as error:
util.reraise(exceptions.InferenceError(
error.message, target=self, attribute=name, context=context))
def instance_getitem(self, index, context=None):
# Rewrap index to Const for this case
if context:
new_context = context.clone()
else:
context = new_context = contextmod.InferenceContext()
# Create a new callcontext for providing index as an argument.
new_context.callcontext = contextmod.CallContext(args=[index])
new_context.boundnode = self
method = next(self.igetattr('__getitem__', context=context))
if not isinstance(method, bases.BoundMethod):
raise exceptions.InferenceError(
'Could not find __getitem__ for {node!r}.',
node=self, context=context)
try:
return next(method.infer_call_result(self, new_context))
except StopIteration:
util.reraise(exceptions.InferenceError(
message='Inference for {node!r}[{index!s}] failed.',
node=self, index=index, context=context))
def igetattr(self, name, context=None):
"""inferred getattr"""
if not context:
context = contextmod.InferenceContext()
try:
# avoid recursively inferring the same attr on the same class
if context.push((self._proxied, name)):
return
# XXX frame should be self._proxied, or not ?
get_attr = self.getattr(name, context, lookupclass=False)
for stmt in _infer_stmts(self._wrap_attr(get_attr, context),
context, frame=self):
yield stmt
except exceptions.AttributeInferenceError:
try:
# fallback to class.igetattr since it has some logic to handle
# descriptors
for stmt in self._wrap_attr(self._proxied.igetattr(name, context),
context):
yield stmt
except exceptions.AttributeInferenceError as error:
util.reraise(exceptions.InferenceError(**vars(error)))
def parse(string, default=None):
string = string or default
try:
return tuple(int(v) for v in string.split('.'))
except ValueError:
util.reraise(ValueError('%s is not a correct version : should be X.Y[.Z].' % version))
