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500 lines
17 KiB
Python
500 lines
17 KiB
Python
from abc import abstractmethod
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from contextlib import contextmanager
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from pathlib import Path
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from typing import Optional
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from parso.tree import search_ancestor
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from parso.python.tree import Name
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from jedi.inference.filters import ParserTreeFilter, MergedFilter, \
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GlobalNameFilter
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from jedi.inference.names import AnonymousParamName, TreeNameDefinition
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from jedi.inference.base_value import NO_VALUES, ValueSet
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from jedi.parser_utils import get_parent_scope
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from jedi import debug
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from jedi import parser_utils
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class AbstractContext:
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# Must be defined: inference_state and tree_node and parent_context as an attribute/property
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def __init__(self, inference_state):
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self.inference_state = inference_state
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self.predefined_names = {}
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@abstractmethod
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def get_filters(self, until_position=None, origin_scope=None):
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raise NotImplementedError
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def goto(self, name_or_str, position):
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from jedi.inference import finder
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filters = _get_global_filters_for_name(
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self, name_or_str if isinstance(name_or_str, Name) else None, position,
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)
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names = finder.filter_name(filters, name_or_str)
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debug.dbg('context.goto %s in (%s): %s', name_or_str, self, names)
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return names
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def py__getattribute__(self, name_or_str, name_context=None, position=None,
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analysis_errors=True):
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"""
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:param position: Position of the last statement -> tuple of line, column
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"""
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if name_context is None:
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name_context = self
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names = self.goto(name_or_str, position)
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string_name = name_or_str.value if isinstance(name_or_str, Name) else name_or_str
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# This paragraph is currently needed for proper branch type inference
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# (static analysis).
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found_predefined_types = None
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if self.predefined_names and isinstance(name_or_str, Name):
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node = name_or_str
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while node is not None and not parser_utils.is_scope(node):
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node = node.parent
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if node.type in ("if_stmt", "for_stmt", "comp_for", 'sync_comp_for'):
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try:
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name_dict = self.predefined_names[node]
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types = name_dict[string_name]
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except KeyError:
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continue
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else:
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found_predefined_types = types
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break
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if found_predefined_types is not None and names:
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from jedi.inference import flow_analysis
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check = flow_analysis.reachability_check(
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context=self,
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value_scope=self.tree_node,
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node=name_or_str,
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)
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if check is flow_analysis.UNREACHABLE:
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values = NO_VALUES
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else:
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values = found_predefined_types
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else:
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values = ValueSet.from_sets(name.infer() for name in names)
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if not names and not values and analysis_errors:
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if isinstance(name_or_str, Name):
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from jedi.inference import analysis
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message = ("NameError: name '%s' is not defined." % string_name)
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analysis.add(name_context, 'name-error', name_or_str, message)
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debug.dbg('context.names_to_types: %s -> %s', names, values)
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if values:
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return values
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return self._check_for_additional_knowledge(name_or_str, name_context, position)
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def _check_for_additional_knowledge(self, name_or_str, name_context, position):
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name_context = name_context or self
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# Add isinstance and other if/assert knowledge.
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if isinstance(name_or_str, Name) and not name_context.is_instance():
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flow_scope = name_or_str
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base_nodes = [name_context.tree_node]
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if any(b.type in ('comp_for', 'sync_comp_for') for b in base_nodes):
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return NO_VALUES
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from jedi.inference.finder import check_flow_information
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while True:
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flow_scope = get_parent_scope(flow_scope, include_flows=True)
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n = check_flow_information(name_context, flow_scope,
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name_or_str, position)
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if n is not None:
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return n
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if flow_scope in base_nodes:
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break
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return NO_VALUES
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def get_root_context(self):
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parent_context = self.parent_context
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if parent_context is None:
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return self
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return parent_context.get_root_context()
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def is_module(self):
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return False
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def is_builtins_module(self):
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return False
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def is_class(self):
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return False
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def is_stub(self):
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return False
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def is_instance(self):
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return False
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def is_compiled(self):
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return False
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def is_bound_method(self):
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return False
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@abstractmethod
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def py__name__(self):
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raise NotImplementedError
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def get_value(self):
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raise NotImplementedError
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@property
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def name(self):
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return None
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def get_qualified_names(self):
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return ()
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def py__doc__(self):
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return ''
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@contextmanager
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def predefine_names(self, flow_scope, dct):
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predefined = self.predefined_names
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predefined[flow_scope] = dct
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try:
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yield
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finally:
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del predefined[flow_scope]
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class ValueContext(AbstractContext):
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"""
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Should be defined, otherwise the API returns empty types.
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"""
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def __init__(self, value):
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super().__init__(value.inference_state)
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self._value = value
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@property
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def tree_node(self):
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return self._value.tree_node
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@property
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def parent_context(self):
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return self._value.parent_context
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def is_module(self):
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return self._value.is_module()
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def is_builtins_module(self):
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return self._value == self.inference_state.builtins_module
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def is_class(self):
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return self._value.is_class()
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def is_stub(self):
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return self._value.is_stub()
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def is_instance(self):
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return self._value.is_instance()
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def is_compiled(self):
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return self._value.is_compiled()
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def is_bound_method(self):
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return self._value.is_bound_method()
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def py__name__(self):
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return self._value.py__name__()
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@property
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def name(self):
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return self._value.name
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def get_qualified_names(self):
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return self._value.get_qualified_names()
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def py__doc__(self):
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return self._value.py__doc__()
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def get_value(self):
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return self._value
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def __repr__(self):
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return '%s(%s)' % (self.__class__.__name__, self._value)
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class TreeContextMixin:
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def infer_node(self, node):
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from jedi.inference.syntax_tree import infer_node
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return infer_node(self, node)
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def create_value(self, node):
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from jedi.inference import value
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if node == self.tree_node:
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assert self.is_module()
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return self.get_value()
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parent_context = self.create_context(node)
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if node.type in ('funcdef', 'lambdef'):
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func = value.FunctionValue.from_context(parent_context, node)
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if parent_context.is_class():
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class_value = parent_context.parent_context.create_value(parent_context.tree_node)
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instance = value.AnonymousInstance(
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self.inference_state, parent_context.parent_context, class_value)
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func = value.BoundMethod(
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instance=instance,
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class_context=class_value.as_context(),
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function=func
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)
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return func
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elif node.type == 'classdef':
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return value.ClassValue(self.inference_state, parent_context, node)
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else:
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raise NotImplementedError("Probably shouldn't happen: %s" % node)
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def create_context(self, node):
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def from_scope_node(scope_node, is_nested=True):
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if scope_node == self.tree_node:
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return self
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if scope_node.type in ('funcdef', 'lambdef', 'classdef'):
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return self.create_value(scope_node).as_context()
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elif scope_node.type in ('comp_for', 'sync_comp_for'):
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parent_context = from_scope_node(parent_scope(scope_node.parent))
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if node.start_pos >= scope_node.children[-1].start_pos:
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return parent_context
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return CompForContext(parent_context, scope_node)
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raise Exception("There's a scope that was not managed: %s" % scope_node)
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def parent_scope(node):
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while True:
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node = node.parent
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if parser_utils.is_scope(node):
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return node
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elif node.type in ('argument', 'testlist_comp'):
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if node.children[1].type in ('comp_for', 'sync_comp_for'):
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return node.children[1]
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elif node.type == 'dictorsetmaker':
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for n in node.children[1:4]:
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# In dictionaries it can be pretty much anything.
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if n.type in ('comp_for', 'sync_comp_for'):
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return n
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scope_node = parent_scope(node)
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if scope_node.type in ('funcdef', 'classdef'):
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colon = scope_node.children[scope_node.children.index(':')]
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if node.start_pos < colon.start_pos:
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parent = node.parent
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if not (parent.type == 'param' and parent.name == node):
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scope_node = parent_scope(scope_node)
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return from_scope_node(scope_node, is_nested=True)
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def create_name(self, tree_name):
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definition = tree_name.get_definition()
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if definition and definition.type == 'param' and definition.name == tree_name:
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funcdef = search_ancestor(definition, 'funcdef', 'lambdef')
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func = self.create_value(funcdef)
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return AnonymousParamName(func, tree_name)
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else:
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context = self.create_context(tree_name)
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return TreeNameDefinition(context, tree_name)
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class FunctionContext(TreeContextMixin, ValueContext):
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def get_filters(self, until_position=None, origin_scope=None):
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yield ParserTreeFilter(
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self.inference_state,
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parent_context=self,
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until_position=until_position,
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origin_scope=origin_scope
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)
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class ModuleContext(TreeContextMixin, ValueContext):
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def py__file__(self) -> Optional[Path]:
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return self._value.py__file__() # type: ignore[no-any-return]
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def get_filters(self, until_position=None, origin_scope=None):
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filters = self._value.get_filters(origin_scope)
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# Skip the first filter and replace it.
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next(filters, None)
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yield MergedFilter(
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ParserTreeFilter(
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parent_context=self,
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until_position=until_position,
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origin_scope=origin_scope
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),
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self.get_global_filter(),
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)
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yield from filters
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def get_global_filter(self):
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return GlobalNameFilter(self)
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@property
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def string_names(self):
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return self._value.string_names
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@property
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def code_lines(self):
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return self._value.code_lines
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def get_value(self):
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"""
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This is the only function that converts a context back to a value.
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This is necessary for stub -> python conversion and vice versa. However
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this method shouldn't be moved to AbstractContext.
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"""
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return self._value
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class NamespaceContext(TreeContextMixin, ValueContext):
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def get_filters(self, until_position=None, origin_scope=None):
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return self._value.get_filters()
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def get_value(self):
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return self._value
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@property
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def string_names(self):
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return self._value.string_names
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def py__file__(self) -> Optional[Path]:
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return self._value.py__file__() # type: ignore[no-any-return]
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class ClassContext(TreeContextMixin, ValueContext):
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def get_filters(self, until_position=None, origin_scope=None):
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yield self.get_global_filter(until_position, origin_scope)
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def get_global_filter(self, until_position=None, origin_scope=None):
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return ParserTreeFilter(
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parent_context=self,
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until_position=until_position,
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origin_scope=origin_scope
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)
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class CompForContext(TreeContextMixin, AbstractContext):
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def __init__(self, parent_context, comp_for):
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super().__init__(parent_context.inference_state)
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self.tree_node = comp_for
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self.parent_context = parent_context
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def get_filters(self, until_position=None, origin_scope=None):
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yield ParserTreeFilter(self)
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def get_value(self):
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return None
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def py__name__(self):
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return '<comprehension context>'
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def __repr__(self):
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return '%s(%s)' % (self.__class__.__name__, self.tree_node)
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class CompiledContext(ValueContext):
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def get_filters(self, until_position=None, origin_scope=None):
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return self._value.get_filters()
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class CompiledModuleContext(CompiledContext):
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code_lines = None
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def get_value(self):
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return self._value
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@property
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def string_names(self):
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return self._value.string_names
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def py__file__(self) -> Optional[Path]:
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return self._value.py__file__() # type: ignore[no-any-return]
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def _get_global_filters_for_name(context, name_or_none, position):
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# For functions and classes the defaults don't belong to the
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# function and get inferred in the value before the function. So
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# make sure to exclude the function/class name.
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if name_or_none is not None:
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ancestor = search_ancestor(name_or_none, 'funcdef', 'classdef', 'lambdef')
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lambdef = None
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if ancestor == 'lambdef':
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# For lambdas it's even more complicated since parts will
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# be inferred later.
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lambdef = ancestor
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ancestor = search_ancestor(name_or_none, 'funcdef', 'classdef')
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if ancestor is not None:
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colon = ancestor.children[-2]
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if position is not None and position < colon.start_pos:
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if lambdef is None or position < lambdef.children[-2].start_pos:
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position = ancestor.start_pos
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return get_global_filters(context, position, name_or_none)
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def get_global_filters(context, until_position, origin_scope):
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"""
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Returns all filters in order of priority for name resolution.
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For global name lookups. The filters will handle name resolution
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themselves, but here we gather possible filters downwards.
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>>> from jedi import Script
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>>> script = Script('''
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... x = ['a', 'b', 'c']
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... def func():
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... y = None
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... ''')
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>>> module_node = script._module_node
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>>> scope = next(module_node.iter_funcdefs())
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>>> scope
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<Function: func@3-5>
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>>> context = script._get_module_context().create_context(scope)
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>>> filters = list(get_global_filters(context, (4, 0), None))
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First we get the names from the function scope.
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>>> print(filters[0]) # doctest: +ELLIPSIS
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MergedFilter(<ParserTreeFilter: ...>, <GlobalNameFilter: ...>)
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>>> sorted(str(n) for n in filters[0].values()) # doctest: +NORMALIZE_WHITESPACE
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['<TreeNameDefinition: string_name=func start_pos=(3, 4)>',
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'<TreeNameDefinition: string_name=x start_pos=(2, 0)>']
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>>> filters[0]._filters[0]._until_position
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(4, 0)
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>>> filters[0]._filters[1]._until_position
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Then it yields the names from one level "lower". In this example, this is
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the module scope (including globals).
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As a side note, you can see, that the position in the filter is None on the
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globals filter, because there the whole module is searched.
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>>> list(filters[1].values()) # package modules -> Also empty.
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[]
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>>> sorted(name.string_name for name in filters[2].values()) # Module attributes
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['__doc__', '__name__', '__package__']
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Finally, it yields the builtin filter, if `include_builtin` is
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true (default).
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>>> list(filters[3].values()) # doctest: +ELLIPSIS
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[...]
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"""
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base_context = context
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from jedi.inference.value.function import BaseFunctionExecutionContext
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while context is not None:
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# Names in methods cannot be resolved within the class.
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yield from context.get_filters(
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until_position=until_position,
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origin_scope=origin_scope
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)
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if isinstance(context, (BaseFunctionExecutionContext, ModuleContext)):
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# The position should be reset if the current scope is a function.
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until_position = None
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context = context.parent_context
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b = next(base_context.inference_state.builtins_module.get_filters(), None)
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assert b is not None
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# Add builtins to the global scope.
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yield b
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