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from astroid import MANAGER, AstroidImportError, inference_tip, nodes
from astroid.nodes import scoped_nodes
from pylint_django import compat, utils
_STR_FIELDS = (
"CharField",
"SlugField",
"URLField",
"TextField",
"EmailField",
"CommaSeparatedIntegerField",
"FilePathField",
"GenericIPAddressField",
"IPAddressField",
"RegexField",
"SlugField",
)
_INT_FIELDS = (
"IntegerField",
"SmallIntegerField",
"BigIntegerField",
"PositiveIntegerField",
"PositiveSmallIntegerField",
)
_BOOL_FIELDS = ("BooleanField", "NullBooleanField")
_RANGE_FIELDS = (
"RangeField",
"IntegerRangeField",
"BigIntegerRangeField",
"FloatRangeField",
"DateTimeRangeField",
"DateRangeField",
)
def is_model_field(cls):
return cls.qname().startswith("django.db.models.fields") or cls.qname().startswith("django.contrib.postgres.fields")
def is_form_field(cls):
return cls.qname().startswith("django.forms.fields")
def is_model_or_form_field(cls):
return is_model_field(cls) or is_form_field(cls)
def apply_type_shim(cls, _context=None): # pylint: disable=too-many-statements
if cls.name in _STR_FIELDS:
base_nodes = scoped_nodes.builtin_lookup("str")
elif cls.name in _INT_FIELDS:
base_nodes = scoped_nodes.builtin_lookup("int")
elif cls.name in _BOOL_FIELDS:
base_nodes = scoped_nodes.builtin_lookup("bool")
elif cls.name == "FloatField":
base_nodes = scoped_nodes.builtin_lookup("float")
elif cls.name == "DecimalField":
try:
base_nodes = MANAGER.ast_from_module_name("_decimal").lookup("Decimal")
except AstroidImportError:
base_nodes = MANAGER.ast_from_module_name("_pydecimal").lookup("Decimal")
elif cls.name in ("SplitDateTimeField", "DateTimeField"):
if compat.COMPILED_DATETIME_CLASSES:
base_nodes = MANAGER.ast_from_module_name("_pydatetime").lookup("datetime")
else:
base_nodes = MANAGER.ast_from_module_name("datetime").lookup("datetime")
elif cls.name == "TimeField":
if compat.COMPILED_DATETIME_CLASSES:
base_nodes = MANAGER.ast_from_module_name("_pydatetime").lookup("time")
else:
base_nodes = MANAGER.ast_from_module_name("datetime").lookup("time")
elif cls.name == "DateField":
if compat.COMPILED_DATETIME_CLASSES:
base_nodes = MANAGER.ast_from_module_name("_pydatetime").lookup("date")
else:
base_nodes = MANAGER.ast_from_module_name("datetime").lookup("date")
elif cls.name == "DurationField":
if compat.COMPILED_DATETIME_CLASSES:
base_nodes = MANAGER.ast_from_module_name("_pydatetime").lookup("timedelta")
else:
base_nodes = MANAGER.ast_from_module_name("datetime").lookup("timedelta")
elif cls.name == "UUIDField":
base_nodes = MANAGER.ast_from_module_name("uuid").lookup("UUID")
elif cls.name == "ManyToManyField":
base_nodes = MANAGER.ast_from_module_name("django.db.models.query").lookup("QuerySet")
elif cls.name in ("ImageField", "FileField"):
base_nodes = MANAGER.ast_from_module_name("django.core.files.base").lookup("File")
elif cls.name == "ArrayField":
base_nodes = scoped_nodes.builtin_lookup("list")
elif cls.name in ("HStoreField", "JSONField"):
base_nodes = scoped_nodes.builtin_lookup("dict")
elif cls.name in _RANGE_FIELDS:
try:
base_nodes = MANAGER.ast_from_module_name("django.db.backends.postgresql.psycopg_any").lookup("Range")
except AstroidImportError:
base_nodes = MANAGER.ast_from_module_name("psycopg2._range").lookup("Range")
else:
return iter([cls])
# XXX: for some reason, with python3, this particular line triggers a
# check in the StdlibChecker for deprecated methods; one of these nodes
# is an ImportFrom which has no qname() method, causing the checker
# to die...
if utils.PY3:
base_nodes = [_valid_base_node(n, _context) for n in base_nodes[1]]
base_nodes = [n for n in base_nodes if n]
else:
base_nodes = list(base_nodes[1])
return iter([cls, *base_nodes])
def _valid_base_node(node, context):
"""Attempts to convert `node` to a valid base node, returns None if it cannot."""
if isinstance(node, nodes.AssignAttr):
inferred = next(node.parent.value.infer(context), None)
if inferred and isinstance(node, nodes.ClassDef):
return inferred
return None
if isinstance(node, nodes.ImportFrom):
return None
return node
def add_transforms(manager):
manager.register_transform(nodes.ClassDef, inference_tip(apply_type_shim), is_model_or_form_field)
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