forked from VimPlug/jedi
225 lines
7.9 KiB
Python
225 lines
7.9 KiB
Python
"""
|
|
PEP 0484 ( https://www.python.org/dev/peps/pep-0484/ ) describes type hints
|
|
through function annotations. There is a strong suggestion in this document
|
|
that only the type of type hinting defined in PEP0484 should be allowed
|
|
as annotations in future python versions.
|
|
|
|
The (initial / probably incomplete) implementation todo list for pep-0484:
|
|
v Function parameter annotations with builtin/custom type classes
|
|
v Function returntype annotations with builtin/custom type classes
|
|
v Function parameter annotations with strings (forward reference)
|
|
v Function return type annotations with strings (forward reference)
|
|
v Local variable type hints
|
|
v Assigned types: `Url = str\ndef get(url:Url) -> str:`
|
|
v Type hints in `with` statements
|
|
x Stub files support
|
|
x support `@no_type_check` and `@no_type_check_decorator`
|
|
x support for typing.cast() operator
|
|
x support for type hint comments for functions, `# type: (int, str) -> int`.
|
|
See comment from Guido https://github.com/davidhalter/jedi/issues/662
|
|
"""
|
|
|
|
import itertools
|
|
import os
|
|
import re
|
|
|
|
from parso import ParserSyntaxError
|
|
from parso.python import tree
|
|
|
|
from jedi.common import unite
|
|
from jedi.evaluate.cache import memoize_default
|
|
from jedi.evaluate import compiled
|
|
from jedi.evaluate.context import LazyTreeContext
|
|
from jedi import debug
|
|
from jedi import _compatibility
|
|
from jedi import parser_utils
|
|
|
|
|
|
def _evaluate_for_annotation(context, annotation, index=None):
|
|
"""
|
|
Evaluates a string-node, looking for an annotation
|
|
If index is not None, the annotation is expected to be a tuple
|
|
and we're interested in that index
|
|
"""
|
|
if annotation is not None:
|
|
definitions = context.eval_node(
|
|
_fix_forward_reference(context, annotation))
|
|
if index is not None:
|
|
definitions = list(itertools.chain.from_iterable(
|
|
definition.py__getitem__(index) for definition in definitions
|
|
if definition.array_type == 'tuple' and
|
|
len(list(definition.py__iter__())) >= index))
|
|
return unite(d.execute_evaluated() for d in definitions)
|
|
else:
|
|
return set()
|
|
|
|
|
|
def _fix_forward_reference(context, node):
|
|
evaled_nodes = context.eval_node(node)
|
|
if len(evaled_nodes) != 1:
|
|
debug.warning("Eval'ed typing index %s should lead to 1 object, "
|
|
" not %s" % (node, evaled_nodes))
|
|
return node
|
|
evaled_node = list(evaled_nodes)[0]
|
|
if isinstance(evaled_node, compiled.CompiledObject) and \
|
|
isinstance(evaled_node.obj, str):
|
|
try:
|
|
new_node = context.evaluator.grammar.parse(
|
|
_compatibility.unicode(evaled_node.obj),
|
|
start_symbol='eval_input',
|
|
error_recovery=False
|
|
)
|
|
except ParserSyntaxError:
|
|
debug.warning('Annotation not parsed: %s' % evaled_node.obj)
|
|
return node
|
|
else:
|
|
module = node.get_root_node()
|
|
parser_utils.move(new_node, module.end_pos[0])
|
|
new_node.parent = context.tree_node
|
|
return new_node
|
|
else:
|
|
return node
|
|
|
|
|
|
@memoize_default()
|
|
def infer_param(execution_context, param):
|
|
annotation = param.annotation
|
|
module_context = execution_context.get_root_context()
|
|
return _evaluate_for_annotation(module_context, annotation)
|
|
|
|
|
|
def py__annotations__(funcdef):
|
|
return_annotation = funcdef.annotation
|
|
if return_annotation:
|
|
dct = {'return': return_annotation}
|
|
else:
|
|
dct = {}
|
|
for function_param in funcdef.params:
|
|
param_annotation = function_param.annotation
|
|
if param_annotation is not None:
|
|
dct[function_param.name.value] = param_annotation
|
|
return dct
|
|
|
|
|
|
@memoize_default()
|
|
def infer_return_types(function_context):
|
|
annotation = py__annotations__(function_context.tree_node).get("return", None)
|
|
module_context = function_context.get_root_context()
|
|
return _evaluate_for_annotation(module_context, annotation)
|
|
|
|
|
|
_typing_module = None
|
|
|
|
|
|
def _get_typing_replacement_module(grammar):
|
|
"""
|
|
The idea is to return our jedi replacement for the PEP-0484 typing module
|
|
as discussed at https://github.com/davidhalter/jedi/issues/663
|
|
"""
|
|
global _typing_module
|
|
if _typing_module is None:
|
|
typing_path = \
|
|
os.path.abspath(os.path.join(__file__, "../jedi_typing.py"))
|
|
with open(typing_path) as f:
|
|
code = _compatibility.unicode(f.read())
|
|
_typing_module = grammar.parse(code)
|
|
return _typing_module
|
|
|
|
|
|
def py__getitem__(context, typ, node):
|
|
if not typ.get_root_context().name.string_name == "typing":
|
|
return None
|
|
# we assume that any class using [] in a module called
|
|
# "typing" with a name for which we have a replacement
|
|
# should be replaced by that class. This is not 100%
|
|
# airtight but I don't have a better idea to check that it's
|
|
# actually the PEP-0484 typing module and not some other
|
|
if node.type == "subscriptlist":
|
|
nodes = node.children[::2] # skip the commas
|
|
else:
|
|
nodes = [node]
|
|
del node
|
|
|
|
nodes = [_fix_forward_reference(context, node) for node in nodes]
|
|
type_name = typ.name.string_name
|
|
|
|
# hacked in Union and Optional, since it's hard to do nicely in parsed code
|
|
if type_name in ("Union", '_Union'):
|
|
# In Python 3.6 it's still called typing.Union but it's an instance
|
|
# called _Union.
|
|
return unite(context.eval_node(node) for node in nodes)
|
|
if type_name in ("Optional", '_Optional'):
|
|
# Here we have the same issue like in Union. Therefore we also need to
|
|
# check for the instance typing._Optional (Python 3.6).
|
|
return context.eval_node(nodes[0])
|
|
|
|
from jedi.evaluate.representation import ModuleContext
|
|
typing = ModuleContext(
|
|
context.evaluator,
|
|
module_node=_get_typing_replacement_module(context.evaluator.latest_grammar),
|
|
path=None
|
|
)
|
|
factories = typing.py__getattribute__("factory")
|
|
assert len(factories) == 1
|
|
factory = list(factories)[0]
|
|
assert factory
|
|
function_body_nodes = factory.tree_node.children[4].children
|
|
valid_classnames = set(child.name.value
|
|
for child in function_body_nodes
|
|
if isinstance(child, tree.Class))
|
|
if type_name not in valid_classnames:
|
|
return None
|
|
compiled_classname = compiled.create(context.evaluator, type_name)
|
|
|
|
from jedi.evaluate.iterable import FakeSequence
|
|
args = FakeSequence(
|
|
context.evaluator,
|
|
"tuple",
|
|
[LazyTreeContext(context, n) for n in nodes]
|
|
)
|
|
|
|
result = factory.execute_evaluated(compiled_classname, args)
|
|
return result
|
|
|
|
|
|
def find_type_from_comment_hint_for(context, node, name):
|
|
return _find_type_from_comment_hint(context, node, node.children[1], name)
|
|
|
|
|
|
def find_type_from_comment_hint_with(context, node, name):
|
|
assert len(node.children[1].children) == 3, \
|
|
"Can only be here when children[1] is 'foo() as f'"
|
|
varlist = node.children[1].children[2]
|
|
return _find_type_from_comment_hint(context, node, varlist, name)
|
|
|
|
|
|
def find_type_from_comment_hint_assign(context, node, name):
|
|
return _find_type_from_comment_hint(context, node, node.children[0], name)
|
|
|
|
|
|
def _find_type_from_comment_hint(context, node, varlist, name):
|
|
index = None
|
|
if varlist.type in ("testlist_star_expr", "exprlist"):
|
|
# something like "a, b = 1, 2"
|
|
index = 0
|
|
for child in varlist.children:
|
|
if child == name:
|
|
break
|
|
if child.type == "operator":
|
|
continue
|
|
index += 1
|
|
else:
|
|
return []
|
|
|
|
comment = parser_utils.get_following_comment_same_line(node)
|
|
if comment is None:
|
|
return []
|
|
match = re.match(r"^#\s*type:\s*([^#]*)", comment)
|
|
if not match:
|
|
return []
|
|
annotation = tree.String(
|
|
repr(str(match.group(1).strip())),
|
|
node.start_pos)
|
|
annotation.parent = node.parent
|
|
return _evaluate_for_annotation(context, annotation, index)
|