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219 lines
7.8 KiB
219 lines
7.8 KiB
"""
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Module for statical analysis.
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"""
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from parso.python import tree
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from jedi._compatibility import force_unicode
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from jedi import debug
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from jedi.evaluate.compiled import CompiledObject
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from jedi.evaluate.helpers import is_string
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CODES = {
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'attribute-error': (1, AttributeError, 'Potential AttributeError.'),
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'name-error': (2, NameError, 'Potential NameError.'),
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'import-error': (3, ImportError, 'Potential ImportError.'),
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'type-error-too-many-arguments': (4, TypeError, None),
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'type-error-too-few-arguments': (5, TypeError, None),
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'type-error-keyword-argument': (6, TypeError, None),
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'type-error-multiple-values': (7, TypeError, None),
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'type-error-star-star': (8, TypeError, None),
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'type-error-star': (9, TypeError, None),
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'type-error-operation': (10, TypeError, None),
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'type-error-not-iterable': (11, TypeError, None),
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'type-error-isinstance': (12, TypeError, None),
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'type-error-not-subscriptable': (13, TypeError, None),
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'value-error-too-many-values': (14, ValueError, None),
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'value-error-too-few-values': (15, ValueError, None),
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}
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class Error(object):
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def __init__(self, name, module_path, start_pos, message=None):
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self.path = module_path
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self._start_pos = start_pos
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self.name = name
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if message is None:
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message = CODES[self.name][2]
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self.message = message
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@property
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def line(self):
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return self._start_pos[0]
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@property
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def column(self):
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return self._start_pos[1]
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@property
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def code(self):
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# The class name start
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first = self.__class__.__name__[0]
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return first + str(CODES[self.name][0])
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def __unicode__(self):
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return '%s:%s:%s: %s %s' % (self.path, self.line, self.column,
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self.code, self.message)
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def __str__(self):
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return self.__unicode__()
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def __eq__(self, other):
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return (self.path == other.path and self.name == other.name and
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self._start_pos == other._start_pos)
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def __ne__(self, other):
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return not self.__eq__(other)
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def __hash__(self):
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return hash((self.path, self._start_pos, self.name))
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def __repr__(self):
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return '<%s %s: %s@%s,%s>' % (self.__class__.__name__,
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self.name, self.path,
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self._start_pos[0], self._start_pos[1])
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class Warning(Error):
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pass
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def add(node_context, error_name, node, message=None, typ=Error, payload=None):
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exception = CODES[error_name][1]
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if _check_for_exception_catch(node_context, node, exception, payload):
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return
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# TODO this path is probably not right
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module_context = node_context.get_root_context()
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module_path = module_context.py__file__()
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instance = typ(error_name, module_path, node.start_pos, message)
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debug.warning(str(instance), format=False)
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node_context.evaluator.analysis.append(instance)
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def _check_for_setattr(instance):
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"""
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Check if there's any setattr method inside an instance. If so, return True.
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"""
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from jedi.evaluate.context import ModuleContext
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module = instance.get_root_context()
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if not isinstance(module, ModuleContext):
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return False
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node = module.tree_node
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try:
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stmts = node.get_used_names()['setattr']
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except KeyError:
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return False
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return any(node.start_pos < stmt.start_pos < node.end_pos
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for stmt in stmts)
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def add_attribute_error(name_context, lookup_context, name):
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message = ('AttributeError: %s has no attribute %s.' % (lookup_context, name))
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from jedi.evaluate.context.instance import AbstractInstanceContext, CompiledInstanceName
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# Check for __getattr__/__getattribute__ existance and issue a warning
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# instead of an error, if that happens.
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typ = Error
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if isinstance(lookup_context, AbstractInstanceContext):
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slot_names = lookup_context.get_function_slot_names(u'__getattr__') + \
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lookup_context.get_function_slot_names(u'__getattribute__')
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for n in slot_names:
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# TODO do we even get here?
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if isinstance(name, CompiledInstanceName) and \
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n.parent_context.obj == object:
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typ = Warning
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break
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if _check_for_setattr(lookup_context):
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typ = Warning
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payload = lookup_context, name
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add(name_context, 'attribute-error', name, message, typ, payload)
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def _check_for_exception_catch(node_context, jedi_name, exception, payload=None):
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"""
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Checks if a jedi object (e.g. `Statement`) sits inside a try/catch and
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doesn't count as an error (if equal to `exception`).
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Also checks `hasattr` for AttributeErrors and uses the `payload` to compare
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it.
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Returns True if the exception was catched.
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"""
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def check_match(cls, exception):
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try:
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return isinstance(cls, CompiledObject) and cls.is_super_class(exception)
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except TypeError:
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return False
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def check_try_for_except(obj, exception):
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# Only nodes in try
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iterator = iter(obj.children)
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for branch_type in iterator:
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colon = next(iterator)
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suite = next(iterator)
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if branch_type == 'try' \
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and not (branch_type.start_pos < jedi_name.start_pos <= suite.end_pos):
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return False
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for node in obj.get_except_clause_tests():
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if node is None:
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return True # An exception block that catches everything.
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else:
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except_classes = node_context.eval_node(node)
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for cls in except_classes:
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from jedi.evaluate.context import iterable
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if isinstance(cls, iterable.Sequence) and \
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cls.array_type == 'tuple':
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# multiple exceptions
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for lazy_context in cls.py__iter__():
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for typ in lazy_context.infer():
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if check_match(typ, exception):
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return True
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else:
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if check_match(cls, exception):
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return True
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def check_hasattr(node, suite):
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try:
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assert suite.start_pos <= jedi_name.start_pos < suite.end_pos
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assert node.type in ('power', 'atom_expr')
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base = node.children[0]
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assert base.type == 'name' and base.value == 'hasattr'
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trailer = node.children[1]
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assert trailer.type == 'trailer'
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arglist = trailer.children[1]
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assert arglist.type == 'arglist'
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from jedi.evaluate.arguments import TreeArguments
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args = list(TreeArguments(node_context.evaluator, node_context, arglist).unpack())
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# Arguments should be very simple
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assert len(args) == 2
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# Check name
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key, lazy_context = args[1]
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names = list(lazy_context.infer())
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assert len(names) == 1 and is_string(names[0])
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assert force_unicode(names[0].get_safe_value()) == payload[1].value
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# Check objects
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key, lazy_context = args[0]
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objects = lazy_context.infer()
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return payload[0] in objects
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except AssertionError:
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return False
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obj = jedi_name
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while obj is not None and not isinstance(obj, (tree.Function, tree.Class)):
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if isinstance(obj, tree.Flow):
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# try/except catch check
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if obj.type == 'try_stmt' and check_try_for_except(obj, exception):
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return True
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# hasattr check
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if exception == AttributeError and obj.type in ('if_stmt', 'while_stmt'):
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if check_hasattr(obj.children[1], obj.children[3]):
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return True
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obj = obj.parent
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return False
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