def from_scope_node(scope_node, is_nested=True, node_is_object=False):
if scope_node == base_node:
return base_context
is_funcdef = scope_node.type in ('funcdef', 'lambdef')
parent_scope = parser_utils.get_parent_scope(scope_node)
parent_context = from_scope_node(parent_scope)
if is_funcdef:
func = FunctionContext.from_context(parent_context, scope_node)
if parent_context.is_class():
instance = AnonymousInstance(
self, parent_context.parent_context, parent_context)
func = BoundMethod(
instance=instance,
function=func
)
if is_nested and not node_is_object:
return func.get_function_execution()
return func
elif scope_node.type == 'classdef':
return ClassContext(self, parent_context, scope_node)
elif scope_node.type == 'comp_for':
if node.start_pos >= scope_node.children[-1].start_pos:
return parent_context
return CompForContext.from_comp_for(parent_context, scope_node)
raise Exception("There's a scope that was not managed.")
def _apply_decorators(context, node):
"""
Returns the function, that should to be executed in the end.
This is also the places where the decorators are processed.
"""
if node.type == 'classdef':
decoratee_context = ClassContext(
context.evaluator,
parent_context=context,
tree_node=node
)
else:
decoratee_context = FunctionContext.from_context(context, node)
initial = values = ContextSet(decoratee_context)
for dec in reversed(node.get_decorators()):
debug.dbg('decorator: %s %s', dec, values)
dec_values = context.eval_node(dec.children[1])
trailer_nodes = dec.children[2:-1]
if trailer_nodes:
# Create a trailer and evaluate it.
trailer = tree.PythonNode('trailer', trailer_nodes)
trailer.parent = dec
dec_values = eval_trailer(context, dec_values, trailer)
if not len(dec_values):
debug.warning('decorator not found: %s on %s', dec, node)
return initial
values = dec_values.execute(arguments.ValuesArguments([values]))
if not len(values):
debug.warning('not possible to resolve wrappers found %s', node)
return initial
debug.dbg('decorator end %s', values)
return values
def goto_stub_definitions(self, context, name):
def_ = name.get_definition(import_name_always=True)
if def_ is not None:
type_ = def_.type
is_classdef = type_ == 'classdef'
if is_classdef or type_ == 'funcdef':
if is_classdef:
c = ClassContext(self, context, name.parent)
else:
c = FunctionContext.from_context(context, name.parent)
return ContextSet([c])
if type_ == 'expr_stmt':
is_simple_name = name.parent.type not in ('power', 'trailer')
if is_simple_name:
return eval_expr_stmt(context, def_, name)
if type_ == 'for_stmt':
container_types = context.eval_node(def_.children[3])
cn = ContextualizedNode(context, def_.children[3])
for_types = iterate_contexts(container_types, cn)
c_node = ContextualizedName(context, name)
return check_tuple_assignments(self, c_node, for_types)
if type_ in ('import_from', 'import_name'):
return imports.infer_import(context, name)
else:
result = self._follow_error_node_imports_if_possible(context, name)
if result is not None:
return result
return helpers.evaluate_call_of_leaf(context, name)
def _apply_decorators(context, node):
"""
Returns the function, that should to be executed in the end.
This is also the places where the decorators are processed.
"""
if node.type == 'classdef':
decoratee_context = ClassContext(context.evaluator,
parent_context=context,
tree_node=node)
else:
decoratee_context = FunctionContext.from_context(context, node)
initial = values = ContextSet(decoratee_context)
for dec in reversed(node.get_decorators()):
debug.dbg('decorator: %s %s', dec, values)
dec_values = context.eval_node(dec.children[1])
trailer_nodes = dec.children[2:-1]
if trailer_nodes:
# Create a trailer and evaluate it.
trailer = tree.PythonNode('trailer', trailer_nodes)
trailer.parent = dec
dec_values = eval_trailer(context, dec_values, trailer)
if not len(dec_values):
debug.warning('decorator not found: %s on %s', dec, node)
return initial
values = dec_values.execute(arguments.ValuesArguments([values]))
if not len(values):
debug.warning('not possible to resolve wrappers found %s', node)
return initial
debug.dbg('decorator end %s', values)
return values
def from_scope_node(scope_node, child_is_funcdef=None, is_nested=True, node_is_object=False):
if scope_node == base_node:
return base_context
is_funcdef = scope_node.type in ('funcdef', 'lambdef')
parent_scope = parser_utils.get_parent_scope(scope_node)
parent_context = from_scope_node(parent_scope, child_is_funcdef=is_funcdef)
if is_funcdef:
func = FunctionContext.from_context(
parent_context,
scope_node
)
if isinstance(parent_context, AnonymousInstance):
func = BoundMethod(
instance=parent_context,
klass=parent_context.class_context,
function=func
)
if is_nested and not node_is_object:
return func.get_function_execution()
return func
elif scope_node.type == 'classdef':
class_context = ClassContext(self, parent_context, scope_node)
if child_is_funcdef:
# anonymous instance
return AnonymousInstance(self, parent_context, class_context)
else:
return class_context
elif scope_node.type == 'comp_for':
if node.start_pos >= scope_node.children[-1].start_pos:
return parent_context
return CompForContext.from_comp_for(parent_context, scope_node)
raise Exception("There's a scope that was not managed.")
def _apply_decorators(context, node):
"""
Returns the function, that should to be executed in the end.
This is also the places where the decorators are processed.
"""
if node.type == 'classdef':
decoratee_context = ClassContext(
context.evaluator,
parent_context=context,
tree_node=node
)
else:
decoratee_context = FunctionContext.from_context(context, node)
initial = values = ContextSet([decoratee_context])
for dec in reversed(node.get_decorators()):
debug.dbg('decorator: %s %s', dec, values, color="MAGENTA")
with debug.increase_indent_cm():
dec_values = context.eval_node(dec.children[1])
trailer_nodes = dec.children[2:-1]
if trailer_nodes:
# Create a trailer and evaluate it.
trailer = tree.PythonNode('trailer', trailer_nodes)
trailer.parent = dec
dec_values = eval_trailer(context, dec_values, trailer)
if not len(dec_values):
code = dec.get_code(include_prefix=False)
# For the short future, we don't want to hear about the runtime
# decorator in typing that was intentionally omitted. This is not
# "correct", but helps with debugging.
if code != '@runtime\n':
debug.warning('decorator not found: %s on %s', dec, node)
return initial
values = dec_values.execute(arguments.ValuesArguments([values]))
if not len(values):
debug.warning('not possible to resolve wrappers found %s', node)
return initial
debug.dbg('decorator end %s', values, color="MAGENTA")
if values != initial:
return ContextSet([Decoratee(c, decoratee_context) for c in values])
return values
def goto_definitions(self, context, name):
def_ = name.get_definition(import_name_always=True)
if def_ is not None:
type_ = def_.type
if type_ == 'classdef':
return [ClassContext(self, context, name.parent)]
elif type_ == 'funcdef':
return [FunctionContext.from_context(context, name.parent)]
if type_ == 'expr_stmt':
is_simple_name = name.parent.type not in ('power', 'trailer')
if is_simple_name:
return eval_expr_stmt(context, def_, name)
if type_ == 'for_stmt':
container_types = context.eval_node(def_.children[3])
cn = ContextualizedNode(context, def_.children[3])
for_types = iterate_contexts(container_types, cn)
c_node = ContextualizedName(context, name)
return check_tuple_assignments(self, c_node, for_types)
if type_ in ('import_from', 'import_name'):
return imports.infer_import(context, name)
return helpers.evaluate_call_of_leaf(context, name)
def goto_definitions(self, context, name):
def_ = name.get_definition(import_name_always=True)
if def_ is not None:
type_ = def_.type
if type_ == 'classdef':
return [ClassContext(self, context, name.parent)]
elif type_ == 'funcdef':
return [FunctionContext.from_context(context, name.parent)]
if type_ == 'expr_stmt':
is_simple_name = name.parent.type not in ('power', 'trailer')
if is_simple_name:
return eval_expr_stmt(context, def_, name)
if type_ == 'for_stmt':
container_types = context.eval_node(def_.children[3])
cn = ContextualizedNode(context, def_.children[3])
for_types = iterate_contexts(container_types, cn)
c_node = ContextualizedName(context, name)
return check_tuple_assignments(self, c_node, for_types)
if type_ in ('import_from', 'import_name'):
return imports.infer_import(context, name)
return helpers.evaluate_call_of_leaf(context, name)
def eval_node(context, element):
debug.dbg('eval_node %s@%s in %s', element, element.start_pos, context)
evaluator = context.evaluator
typ = element.type
if typ in ('name', 'number', 'string', 'atom', 'strings', 'keyword',
'fstring'):
return eval_atom(context, element)
elif typ == 'lambdef':
return ContextSet([FunctionContext.from_context(context, element)])
elif typ == 'expr_stmt':
return eval_expr_stmt(context, element)
elif typ in ('power', 'atom_expr'):
first_child = element.children[0]
children = element.children[1:]
had_await = False
if first_child.type == 'keyword' and first_child.value == 'await':
had_await = True
first_child = children.pop(0)
context_set = context.eval_node(first_child)
for (i, trailer) in enumerate(children):
if trailer == '**': # has a power operation.
right = context.eval_node(children[i + 1])
context_set = _eval_comparison(evaluator, context, context_set,
trailer, right)
break
context_set = eval_trailer(context, context_set, trailer)
if had_await:
return context_set.py__await__().py__stop_iteration_returns()
return context_set
elif typ in (
'testlist_star_expr',
'testlist',
):
# The implicit tuple in statements.
return ContextSet(
[iterable.SequenceLiteralContext(evaluator, context, element)])
elif typ in ('not_test', 'factor'):
context_set = context.eval_node(element.children[-1])
for operator in element.children[:-1]:
context_set = eval_factor(context_set, operator)
return context_set
elif typ == 'test':
# `x if foo else y` case.
return (context.eval_node(element.children[0])
| context.eval_node(element.children[-1]))
elif typ == 'operator':
# Must be an ellipsis, other operators are not evaluated.
# In Python 2 ellipsis is coded as three single dot tokens, not
# as one token 3 dot token.
if element.value not in ('.', '...'):
origin = element.parent
raise AssertionError("unhandled operator %s in %s " %
(repr(element.value), origin))
return ContextSet([compiled.builtin_from_name(evaluator, u'Ellipsis')])
elif typ == 'dotted_name':
context_set = eval_atom(context, element.children[0])
for next_name in element.children[2::2]:
# TODO add search_global=True?
context_set = context_set.py__getattribute__(next_name,
name_context=context)
return context_set
elif typ == 'eval_input':
return eval_node(context, element.children[0])
elif typ == 'annassign':
return annotation.eval_annotation(context, element.children[1]) \
.execute_annotation()
elif typ == 'yield_expr':
if len(element.children) and element.children[1].type == 'yield_arg':
# Implies that it's a yield from.
element = element.children[1].children[1]
generators = context.eval_node(element) \
.py__getattribute__('__iter__').execute_evaluated()
return generators.py__stop_iteration_returns()
# Generator.send() is not implemented.
return NO_CONTEXTS
elif typ == 'namedexpr_test':
return eval_node(context, element.children[2])
else:
return eval_or_test(context, element)
def eval_node(context, element):
debug.dbg('eval_node %s@%s', element, element.start_pos)
evaluator = context.evaluator
typ = element.type
if typ in ('name', 'number', 'string', 'atom', 'strings', 'keyword'):
return eval_atom(context, element)
elif typ == 'lambdef':
return ContextSet(FunctionContext.from_context(context, element))
elif typ == 'expr_stmt':
return eval_expr_stmt(context, element)
elif typ in ('power', 'atom_expr'):
first_child = element.children[0]
children = element.children[1:]
had_await = False
if first_child.type == 'keyword' and first_child.value == 'await':
had_await = True
first_child = children.pop(0)
context_set = eval_atom(context, first_child)
for trailer in children:
if trailer == '**': # has a power operation.
right = context.eval_node(children[1])
context_set = _eval_comparison(
evaluator,
context,
context_set,
trailer,
right
)
break
context_set = eval_trailer(context, context_set, trailer)
if had_await:
await_context_set = context_set.py__getattribute__(u"__await__")
if not await_context_set:
debug.warning('Tried to run py__await__ on context %s', context)
context_set = ContextSet()
return _py__stop_iteration_returns(await_context_set.execute_evaluated())
return context_set
elif typ in ('testlist_star_expr', 'testlist',):
# The implicit tuple in statements.
return ContextSet(iterable.SequenceLiteralContext(evaluator, context, element))
elif typ in ('not_test', 'factor'):
context_set = context.eval_node(element.children[-1])
for operator in element.children[:-1]:
context_set = eval_factor(context_set, operator)
return context_set
elif typ == 'test':
# `x if foo else y` case.
return (context.eval_node(element.children[0]) |
context.eval_node(element.children[-1]))
elif typ == 'operator':
# Must be an ellipsis, other operators are not evaluated.
# In Python 2 ellipsis is coded as three single dot tokens, not
# as one token 3 dot token.
if element.value not in ('.', '...'):
origin = element.parent
raise AssertionError("unhandled operator %s in %s " % (repr(element.value), origin))
return ContextSet(compiled.builtin_from_name(evaluator, u'Ellipsis'))
elif typ == 'dotted_name':
context_set = eval_atom(context, element.children[0])
for next_name in element.children[2::2]:
# TODO add search_global=True?
context_set = context_set.py__getattribute__(next_name, name_context=context)
return context_set
elif typ == 'eval_input':
return eval_node(context, element.children[0])
elif typ == 'annassign':
return pep0484._evaluate_for_annotation(context, element.children[1])
elif typ == 'yield_expr':
if len(element.children) and element.children[1].type == 'yield_arg':
# Implies that it's a yield from.
element = element.children[1].children[1]
generators = context.eval_node(element)
return _py__stop_iteration_returns(generators)
# Generator.send() is not implemented.
return NO_CONTEXTS
else:
return eval_or_test(context, element)