mirror of
https://github.com/davidhalter/jedi.git
synced 2025-12-07 14:34:31 +08:00
111 lines
3.8 KiB
Python
111 lines
3.8 KiB
Python
"""
|
|
Module is used to infer Django model fields.
|
|
Bugs:
|
|
- Can't infer User model.
|
|
- Can't infer ManyToManyField.
|
|
"""
|
|
from jedi import debug
|
|
from jedi.inference.base_value import LazyValueWrapper
|
|
from jedi.inference.utils import safe_property
|
|
from jedi.inference.filters import ParserTreeFilter, DictFilter
|
|
from jedi.inference.names import ValueName
|
|
from jedi.inference.value.instance import TreeInstance
|
|
|
|
|
|
class DjangoModelField(LazyValueWrapper):
|
|
def __init__(self, cls, name):
|
|
self.inference_state = cls.inference_state
|
|
self._cls = cls
|
|
self._name = name
|
|
self.tree_node = self._name.tree_name
|
|
|
|
@safe_property
|
|
def name(self):
|
|
return ValueName(self, self._name.tree_name)
|
|
|
|
def _get_wrapped_value(self):
|
|
obj, = self._cls.execute_with_values()
|
|
return obj
|
|
|
|
|
|
mapping = {
|
|
'IntegerField': (None, 'int'),
|
|
'BigIntegerField': (None, 'int'),
|
|
'PositiveIntegerField': (None, 'int'),
|
|
'SmallIntegerField': (None, 'int'),
|
|
'CharField': (None, 'str'),
|
|
'TextField': (None, 'str'),
|
|
'EmailField': (None, 'str'),
|
|
'FloatField': (None, 'float'),
|
|
'BinaryField': (None, 'bytes'),
|
|
'BooleanField': (None, 'bool'),
|
|
'DecimalField': ('decimal', 'Decimal'),
|
|
'TimeField': ('datetime', 'time'),
|
|
'DurationField': ('datetime', 'timedelta'),
|
|
'DateField': ('datetime', 'date'),
|
|
'DateTimeField': ('datetime', 'datetime'),
|
|
}
|
|
|
|
|
|
def _infer_scalar_field(inference_state, field_name, field_tree_instance):
|
|
try:
|
|
module_name, attribute_name = mapping[field_tree_instance.py__name__()]
|
|
except KeyError:
|
|
return None
|
|
|
|
if module_name is None:
|
|
module = inference_state.builtins_module
|
|
else:
|
|
module = inference_state.import_module((module_name,))
|
|
|
|
attribute, = module.py__getattribute__(attribute_name)
|
|
return DjangoModelField(attribute, field_name)
|
|
|
|
|
|
def _infer_field(cls, field_name):
|
|
inference_state = cls.inference_state
|
|
field_tree_instance, = field_name.infer()
|
|
scalar_field = _infer_scalar_field(inference_state, field_name, field_tree_instance)
|
|
if scalar_field:
|
|
return scalar_field
|
|
|
|
if field_tree_instance.py__name__() == 'ForeignKey':
|
|
if isinstance(field_tree_instance, TreeInstance):
|
|
# TODO private access..
|
|
argument_iterator = field_tree_instance._arguments.unpack()
|
|
key, lazy_values = next(argument_iterator, (None, None))
|
|
if key is None and lazy_values is not None:
|
|
for value in lazy_values.infer():
|
|
if value.py__name__() == 'str':
|
|
foreign_key_class_name = value.get_safe_value()
|
|
for v in cls.get_root_context().py__getattribute__(foreign_key_class_name):
|
|
if v.is_class():
|
|
return DjangoModelField(v, field_name)
|
|
elif value.is_class():
|
|
return DjangoModelField(value, field_name)
|
|
|
|
debug.dbg('django plugin: fail to infer `%s` from class `%s`',
|
|
field_name.string_name, cls.py__name__())
|
|
return None
|
|
|
|
|
|
def _new_dict_filter(cls):
|
|
def iterate():
|
|
filter_ = ParserTreeFilter(parent_context=cls.as_context())
|
|
for name in filter_.values():
|
|
django_field = _infer_field(cls, name)
|
|
if django_field is not None:
|
|
yield name.string_name, django_field.name
|
|
return DictFilter(dict(iterate()))
|
|
|
|
|
|
def get_metaclass_filters(func):
|
|
def wrapper(cls, metaclasses):
|
|
for metaclass in metaclasses:
|
|
if metaclass.py__name__() == 'ModelBase' \
|
|
and metaclass.get_root_context().py__name__() == 'django.db.models.base':
|
|
return [_new_dict_filter(cls)]
|
|
|
|
return func(cls, metaclasses)
|
|
return wrapper
|