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484 lines
16 KiB
484 lines
16 KiB
6 years ago
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"""
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Imitate the parser representation.
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"""
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import re
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from functools import partial
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from jedi import debug
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from jedi._compatibility import force_unicode, Parameter
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from jedi.cache import underscore_memoization, memoize_method
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from jedi.evaluate.filters import AbstractFilter, AbstractNameDefinition, \
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ContextNameMixin
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from jedi.evaluate.base_context import Context, ContextSet
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from jedi.evaluate.lazy_context import LazyKnownContext
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from jedi.evaluate.compiled.access import _sentinel
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from jedi.evaluate.cache import evaluator_function_cache
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from jedi.evaluate.helpers import reraise_as_evaluator
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from . import fake
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class CheckAttribute(object):
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"""Raises an AttributeError if the attribute X isn't available."""
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def __init__(self, func):
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self.func = func
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# Remove the py in front of e.g. py__call__.
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self.check_name = force_unicode(func.__name__[2:])
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def __get__(self, instance, owner):
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if instance is None:
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return self
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# This might raise an AttributeError. That's wanted.
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if self.check_name == '__iter__':
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# Python iterators are a bit strange, because there's no need for
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# the __iter__ function as long as __getitem__ is defined (it will
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# just start with __getitem__(0). This is especially true for
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# Python 2 strings, where `str.__iter__` is not even defined.
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if not instance.access_handle.has_iter():
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raise AttributeError
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else:
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instance.access_handle.getattr(self.check_name)
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return partial(self.func, instance)
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class CompiledObject(Context):
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def __init__(self, evaluator, access_handle, parent_context=None, faked_class=None):
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super(CompiledObject, self).__init__(evaluator, parent_context)
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self.access_handle = access_handle
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# This attribute will not be set for most classes, except for fakes.
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self.tree_node = faked_class
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@CheckAttribute
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def py__call__(self, params):
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if self.tree_node is not None and self.tree_node.type == 'funcdef':
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from jedi.evaluate.context.function import FunctionContext
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return FunctionContext(
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self.evaluator,
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parent_context=self.parent_context,
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tree_node=self.tree_node
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).py__call__(params)
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if self.access_handle.is_class():
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from jedi.evaluate.context import CompiledInstance
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return ContextSet(CompiledInstance(self.evaluator, self.parent_context, self, params))
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else:
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return ContextSet.from_iterable(self._execute_function(params))
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@CheckAttribute
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def py__class__(self):
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return create_from_access_path(self.evaluator, self.access_handle.py__class__())
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@CheckAttribute
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def py__mro__(self):
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return (self,) + tuple(
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create_from_access_path(self.evaluator, access)
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for access in self.access_handle.py__mro__accesses()
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)
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@CheckAttribute
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def py__bases__(self):
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return tuple(
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create_from_access_path(self.evaluator, access)
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for access in self.access_handle.py__bases__()
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)
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@CheckAttribute
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def py__path__(self):
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return self.access_handle.py__path__()
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def py__bool__(self):
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return self.access_handle.py__bool__()
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def py__file__(self):
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return self.access_handle.py__file__()
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def is_class(self):
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return self.access_handle.is_class()
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def py__doc__(self, include_call_signature=False):
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return self.access_handle.py__doc__()
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def get_param_names(self):
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try:
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signature_params = self.access_handle.get_signature_params()
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except ValueError: # Has no signature
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params_str, ret = self._parse_function_doc()
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tokens = params_str.split(',')
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if self.access_handle.ismethoddescriptor():
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tokens.insert(0, 'self')
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for p in tokens:
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parts = p.strip().split('=')
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yield UnresolvableParamName(self, parts[0])
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else:
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for signature_param in signature_params:
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yield SignatureParamName(self, signature_param)
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def __repr__(self):
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return '<%s: %s>' % (self.__class__.__name__, self.access_handle.get_repr())
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@underscore_memoization
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def _parse_function_doc(self):
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doc = self.py__doc__()
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if doc is None:
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return '', ''
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return _parse_function_doc(doc)
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@property
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def api_type(self):
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return self.access_handle.get_api_type()
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@underscore_memoization
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def _cls(self):
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"""
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We used to limit the lookups for instantiated objects like list(), but
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this is not the case anymore. Python itself
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"""
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# Ensures that a CompiledObject is returned that is not an instance (like list)
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return self
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def get_filters(self, search_global=False, is_instance=False,
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until_position=None, origin_scope=None):
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yield self._ensure_one_filter(is_instance)
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@memoize_method
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def _ensure_one_filter(self, is_instance):
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"""
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search_global shouldn't change the fact that there's one dict, this way
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there's only one `object`.
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"""
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return CompiledObjectFilter(self.evaluator, self, is_instance)
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@CheckAttribute
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def py__getitem__(self, index):
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with reraise_as_evaluator(IndexError, KeyError, TypeError):
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access = self.access_handle.py__getitem__(index)
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if access is None:
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return ContextSet()
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return ContextSet(create_from_access_path(self.evaluator, access))
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@CheckAttribute
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def py__iter__(self):
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for access in self.access_handle.py__iter__list():
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yield LazyKnownContext(create_from_access_path(self.evaluator, access))
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def py__name__(self):
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return self.access_handle.py__name__()
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@property
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def name(self):
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name = self.py__name__()
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if name is None:
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name = self.access_handle.get_repr()
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return CompiledContextName(self, name)
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def _execute_function(self, params):
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from jedi.evaluate import docstrings
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from jedi.evaluate.compiled import builtin_from_name
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if self.api_type != 'function':
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return
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for name in self._parse_function_doc()[1].split():
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try:
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# TODO wtf is this? this is exactly the same as the thing
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# below. It uses getattr as well.
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self.evaluator.builtins_module.access_handle.getattr(name)
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except AttributeError:
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continue
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else:
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bltn_obj = builtin_from_name(self.evaluator, name)
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for result in bltn_obj.execute(params):
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yield result
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for type_ in docstrings.infer_return_types(self):
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yield type_
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def dict_values(self):
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return ContextSet.from_iterable(
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create_from_access_path(self.evaluator, access)
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for access in self.access_handle.dict_values()
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)
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def get_safe_value(self, default=_sentinel):
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try:
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return self.access_handle.get_safe_value()
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except ValueError:
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if default == _sentinel:
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raise
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return default
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def execute_operation(self, other, operator):
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return create_from_access_path(
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self.evaluator,
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self.access_handle.execute_operation(other.access_handle, operator)
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)
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def negate(self):
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return create_from_access_path(self.evaluator, self.access_handle.negate())
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def is_super_class(self, exception):
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return self.access_handle.is_super_class(exception)
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class CompiledName(AbstractNameDefinition):
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def __init__(self, evaluator, parent_context, name):
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self._evaluator = evaluator
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self.parent_context = parent_context
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self.string_name = name
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def __repr__(self):
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try:
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name = self.parent_context.name # __name__ is not defined all the time
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except AttributeError:
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name = None
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return '<%s: (%s).%s>' % (self.__class__.__name__, name, self.string_name)
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@property
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def api_type(self):
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return next(iter(self.infer())).api_type
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@underscore_memoization
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def infer(self):
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return ContextSet(create_from_name(
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self._evaluator, self.parent_context, self.string_name
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))
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class SignatureParamName(AbstractNameDefinition):
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api_type = u'param'
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def __init__(self, compiled_obj, signature_param):
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self.parent_context = compiled_obj.parent_context
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self._signature_param = signature_param
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@property
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def string_name(self):
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return self._signature_param.name
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def get_kind(self):
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return getattr(Parameter, self._signature_param.kind_name)
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def is_keyword_param(self):
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return self._signature_param
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def infer(self):
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p = self._signature_param
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evaluator = self.parent_context.evaluator
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contexts = ContextSet()
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if p.has_default:
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contexts = ContextSet(create_from_access_path(evaluator, p.default))
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if p.has_annotation:
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annotation = create_from_access_path(evaluator, p.annotation)
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contexts |= annotation.execute_evaluated()
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return contexts
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class UnresolvableParamName(AbstractNameDefinition):
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api_type = u'param'
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def __init__(self, compiled_obj, name):
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self.parent_context = compiled_obj.parent_context
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self.string_name = name
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def get_kind(self):
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return Parameter.POSITIONAL_ONLY
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def infer(self):
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return ContextSet()
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class CompiledContextName(ContextNameMixin, AbstractNameDefinition):
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def __init__(self, context, name):
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self.string_name = name
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self._context = context
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self.parent_context = context.parent_context
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class EmptyCompiledName(AbstractNameDefinition):
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"""
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Accessing some names will raise an exception. To avoid not having any
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completions, just give Jedi the option to return this object. It infers to
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nothing.
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"""
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def __init__(self, evaluator, name):
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self.parent_context = evaluator.builtins_module
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self.string_name = name
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def infer(self):
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return ContextSet()
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class CompiledObjectFilter(AbstractFilter):
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name_class = CompiledName
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def __init__(self, evaluator, compiled_object, is_instance=False):
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self._evaluator = evaluator
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self._compiled_object = compiled_object
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self._is_instance = is_instance
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def get(self, name):
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return self._get(
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name,
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lambda: self._compiled_object.access_handle.is_allowed_getattr(name),
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lambda: self._compiled_object.access_handle.dir(),
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check_has_attribute=True
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)
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def _get(self, name, allowed_getattr_callback, dir_callback, check_has_attribute=False):
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"""
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To remove quite a few access calls we introduced the callback here.
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"""
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has_attribute, is_descriptor = allowed_getattr_callback()
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if check_has_attribute and not has_attribute:
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return []
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# Always use unicode objects in Python 2 from here.
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name = force_unicode(name)
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if is_descriptor or not has_attribute:
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return [self._get_cached_name(name, is_empty=True)]
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if self._is_instance and name not in dir_callback():
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return []
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return [self._get_cached_name(name)]
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@memoize_method
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def _get_cached_name(self, name, is_empty=False):
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if is_empty:
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return EmptyCompiledName(self._evaluator, name)
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else:
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return self._create_name(name)
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def values(self):
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from jedi.evaluate.compiled import builtin_from_name
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names = []
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needs_type_completions, dir_infos = self._compiled_object.access_handle.get_dir_infos()
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for name in dir_infos:
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names += self._get(
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name,
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lambda: dir_infos[name],
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lambda: dir_infos.keys(),
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)
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# ``dir`` doesn't include the type names.
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if not self._is_instance and needs_type_completions:
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for filter in builtin_from_name(self._evaluator, u'type').get_filters():
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names += filter.values()
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return names
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def _create_name(self, name):
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return self.name_class(self._evaluator, self._compiled_object, name)
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docstr_defaults = {
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'floating point number': u'float',
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'character': u'str',
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'integer': u'int',
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'dictionary': u'dict',
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'string': u'str',
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}
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def _parse_function_doc(doc):
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"""
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|
Takes a function and returns the params and return value as a tuple.
|
||
|
|
This is nothing more than a docstring parser.
|
||
|
|
|
||
|
|
TODO docstrings like utime(path, (atime, mtime)) and a(b [, b]) -> None
|
||
|
|
TODO docstrings like 'tuple of integers'
|
||
|
|
"""
|
||
|
|
doc = force_unicode(doc)
|
||
|
|
# parse round parentheses: def func(a, (b,c))
|
||
|
|
try:
|
||
|
|
count = 0
|
||
|
|
start = doc.index('(')
|
||
|
|
for i, s in enumerate(doc[start:]):
|
||
|
|
if s == '(':
|
||
|
|
count += 1
|
||
|
|
elif s == ')':
|
||
|
|
count -= 1
|
||
|
|
if count == 0:
|
||
|
|
end = start + i
|
||
|
|
break
|
||
|
|
param_str = doc[start + 1:end]
|
||
|
|
except (ValueError, UnboundLocalError):
|
||
|
|
# ValueError for doc.index
|
||
|
|
# UnboundLocalError for undefined end in last line
|
||
|
|
debug.dbg('no brackets found - no param')
|
||
|
|
end = 0
|
||
|
|
param_str = u''
|
||
|
|
else:
|
||
|
|
# remove square brackets, that show an optional param ( = None)
|
||
|
|
def change_options(m):
|
||
|
|
args = m.group(1).split(',')
|
||
|
|
for i, a in enumerate(args):
|
||
|
|
if a and '=' not in a:
|
||
|
|
args[i] += '=None'
|
||
|
|
return ','.join(args)
|
||
|
|
|
||
|
|
while True:
|
||
|
|
param_str, changes = re.subn(r' ?\[([^\[\]]+)\]',
|
||
|
|
change_options, param_str)
|
||
|
|
if changes == 0:
|
||
|
|
break
|
||
|
|
param_str = param_str.replace('-', '_') # see: isinstance.__doc__
|
||
|
|
|
||
|
|
# parse return value
|
||
|
|
r = re.search(u'-[>-]* ', doc[end:end + 7])
|
||
|
|
if r is None:
|
||
|
|
ret = u''
|
||
|
|
else:
|
||
|
|
index = end + r.end()
|
||
|
|
# get result type, which can contain newlines
|
||
|
|
pattern = re.compile(r'(,\n|[^\n-])+')
|
||
|
|
ret_str = pattern.match(doc, index).group(0).strip()
|
||
|
|
# New object -> object()
|
||
|
|
ret_str = re.sub(r'[nN]ew (.*)', r'\1()', ret_str)
|
||
|
|
|
||
|
|
ret = docstr_defaults.get(ret_str, ret_str)
|
||
|
|
|
||
|
|
return param_str, ret
|
||
|
|
|
||
|
|
|
||
|
|
def create_from_name(evaluator, compiled_object, name):
|
||
|
|
faked = None
|
||
|
|
try:
|
||
|
|
faked = fake.get_faked_with_parent_context(compiled_object, name)
|
||
|
|
except fake.FakeDoesNotExist:
|
||
|
|
pass
|
||
|
|
|
||
|
|
access = compiled_object.access_handle.getattr(name, default=None)
|
||
|
|
parent_context = compiled_object
|
||
|
|
if parent_context.is_class():
|
||
|
|
parent_context = parent_context.parent_context
|
||
|
|
return create_cached_compiled_object(
|
||
|
|
evaluator, access, parent_context=parent_context, faked=faked
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _normalize_create_args(func):
|
||
|
|
"""The cache doesn't care about keyword vs. normal args."""
|
||
|
|
def wrapper(evaluator, obj, parent_context=None, faked=None):
|
||
|
|
return func(evaluator, obj, parent_context, faked)
|
||
|
|
return wrapper
|
||
|
|
|
||
|
|
|
||
|
|
def create_from_access_path(evaluator, access_path):
|
||
|
|
parent_context = None
|
||
|
|
for name, access in access_path.accesses:
|
||
|
|
try:
|
||
|
|
if parent_context is None:
|
||
|
|
faked = fake.get_faked_module(evaluator, access_path.accesses[0][0])
|
||
|
|
else:
|
||
|
|
faked = fake.get_faked_with_parent_context(parent_context, name)
|
||
|
|
except fake.FakeDoesNotExist:
|
||
|
|
faked = None
|
||
|
|
|
||
|
|
parent_context = create_cached_compiled_object(evaluator, access, parent_context, faked)
|
||
|
|
return parent_context
|
||
|
|
|
||
|
|
|
||
|
|
@_normalize_create_args
|
||
|
|
@evaluator_function_cache()
|
||
|
|
def create_cached_compiled_object(evaluator, access_handle, parent_context, faked):
|
||
|
|
return CompiledObject(evaluator, access_handle, parent_context, faked)
|