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"""
Loads functions that are mixed in to the standard library. E.g. builtins are
written in C (binaries), but my autocompletion only understands Python code. By
mixing in Python code, the autocompletion should work much better for builtins.
"""
import os
import inspect
import types
from jedi._compatibility import is_py3, builtins, unicode, is_py34
from jedi.parser import ParserWithRecovery, load_grammar
from jedi.parser import tree as pt
from jedi.evaluate.helpers import FakeName
modules = {}
MethodDescriptorType = type(str.replace)
# These are not considered classes and access is granted even though they have
# a __class__ attribute.
NOT_CLASS_TYPES = (
types.BuiltinFunctionType,
types.CodeType,
types.FrameType,
types.FunctionType,
types.GeneratorType,
types.GetSetDescriptorType,
types.LambdaType,
types.MemberDescriptorType,
types.MethodType,
types.ModuleType,
types.TracebackType,
MethodDescriptorType
)
if is_py3:
NOT_CLASS_TYPES += (
types.MappingProxyType,
types.SimpleNamespace
)
if is_py34:
NOT_CLASS_TYPES += (types.DynamicClassAttribute,)
class FakeDoesNotExist(Exception):
pass
def _load_faked_module(module):
module_name = module.__name__
if module_name == '__builtin__' and not is_py3:
module_name = 'builtins'
try:
return modules[module_name]
except KeyError:
path = os.path.dirname(os.path.abspath(__file__))
try:
with open(os.path.join(path, 'fake', module_name) + '.pym') as f:
source = f.read()
except IOError:
modules[module_name] = None
return
grammar = load_grammar(version='3.4')
module = ParserWithRecovery(grammar, unicode(source), module_name).module
modules[module_name] = module
if module_name == 'builtins' and not is_py3:
# There are two implementations of `open` for either python 2/3.
# -> Rename the python2 version (`look at fake/builtins.pym`).
open_func = search_scope(module, 'open')
open_func.children[1] = FakeName('open_python3')
open_func = search_scope(module, 'open_python2')
open_func.children[1] = FakeName('open')
return module
def search_scope(scope, obj_name):
for s in scope.subscopes:
if str(s.name) == obj_name:
return s
def get_module(obj):
if inspect.ismodule(obj):
return obj
try:
obj = obj.__objclass__
except AttributeError:
pass
try:
imp_plz = obj.__module__
except AttributeError:
# Unfortunately in some cases like `int` there's no __module__
return builtins
else:
if imp_plz is None:
# Happens for example in `(_ for _ in []).send.__module__`.
return builtins
else:
try:
return __import__(imp_plz)
except ImportError:
# __module__ can be something arbitrary that doesn't exist.
return builtins
def _faked(module, obj, name):
# Crazy underscore actions to try to escape all the internal madness.
if module is None:
module = get_module(obj)
faked_mod = _load_faked_module(module)
if faked_mod is None:
return None
# Having the module as a `parser.representation.module`, we need to scan
# for methods.
if name is None:
if inspect.isbuiltin(obj):
return search_scope(faked_mod, obj.__name__)
elif not inspect.isclass(obj):
# object is a method or descriptor
try:
objclass = obj.__objclass__
except AttributeError:
return None
else:
cls = search_scope(faked_mod, objclass.__name__)
if cls is None:
return None
return search_scope(cls, obj.__name__)
else:
if obj == module:
return search_scope(faked_mod, name)
else:
try:
cls_name = obj.__name__
except AttributeError:
return None
cls = search_scope(faked_mod, cls_name)
if cls is None:
return None
return search_scope(cls, name)
def memoize_faked(obj):
"""
A typical memoize function that ignores issues with non hashable results.
"""
cache = obj.cache = {}
def memoizer(*args, **kwargs):
key = (obj, args, frozenset(kwargs.items()))
try:
result = cache[key]
except TypeError:
return obj(*args, **kwargs)
except KeyError:
result = obj(*args, **kwargs)
if result is not None:
cache[key] = obj(*args, **kwargs)
return result
else:
return result
return memoizer
@memoize_faked
def _get_faked(module, obj, name=None):
obj = type(obj) if is_class_instance(obj) else obj
result = _faked(module, obj, name)
if result is None or isinstance(result, pt.Class):
# We're not interested in classes. What we want is functions.
raise FakeDoesNotExist
else:
# Set the docstr which was previously not set (faked modules don't
# contain it).
doc = '"""%s"""' % obj.__doc__ # TODO need escapes.
suite = result.children[-1]
string = pt.String(pt.zero_position_modifier, doc, (0, 0), '')
new_line = pt.Newline('\n', (0, 0), '')
docstr_node = pt.Node('simple_stmt', [string, new_line])
suite.children.insert(2, docstr_node)
return result
def get_faked(module, obj, name=None, parent=None):
faked = _get_faked(module, obj, name)
faked.parent = parent
return faked
def is_class_instance(obj):
"""Like inspect.* methods."""
try:
cls = obj.__class__
except AttributeError:
return False
else:
return cls != type and not issubclass(cls, NOT_CLASS_TYPES)
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