/
evaluate.py
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/
evaluate.py
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from operator import itemgetter
import rope.base.builtins
import rope.base.pynames
import rope.base.pyobjects
from rope.base import ast, astutils, exceptions, pyobjects, arguments, worder
from rope.base.utils import pycompat
BadIdentifierError = exceptions.BadIdentifierError
def eval_location(pymodule, offset):
"""Find the pyname at the offset"""
return eval_location2(pymodule, offset)[1]
def eval_location2(pymodule, offset):
"""Find the primary and pyname at offset"""
pyname_finder = ScopeNameFinder(pymodule)
return pyname_finder.get_primary_and_pyname_at(offset)
def eval_node(scope, node):
"""Evaluate a `ast.AST` node and return a PyName
Return `None` if the expression cannot be evaluated.
"""
return eval_node2(scope, node)[1]
def eval_node2(scope, node):
evaluator = StatementEvaluator(scope)
ast.walk(node, evaluator)
return evaluator.old_result, evaluator.result
def eval_str(holding_scope, name):
return eval_str2(holding_scope, name)[1]
def eval_str2(holding_scope, name):
try:
# parenthesizing for handling cases like 'a_var.\nattr'
node = ast.parse('(%s)' % name)
except SyntaxError:
raise BadIdentifierError(
'Not a resolvable python identifier selected.')
return eval_node2(holding_scope, node)
class ScopeNameFinder(object):
def __init__(self, pymodule):
self.module_scope = pymodule.get_scope()
self.lines = pymodule.lines
self.worder = worder.Worder(pymodule.source_code, True)
def _is_defined_in_class_body(self, holding_scope, offset, lineno):
if lineno == holding_scope.get_start() and \
holding_scope.parent is not None and \
holding_scope.parent.get_kind() == 'Class' and \
self.worder.is_a_class_or_function_name_in_header(offset):
return True
if lineno != holding_scope.get_start() and \
holding_scope.get_kind() == 'Class' and \
self.worder.is_name_assigned_in_class_body(offset):
return True
return False
def _is_function_name_in_function_header(self, scope, offset, lineno):
if scope.get_start() <= lineno <= scope.get_body_start() and \
scope.get_kind() == 'Function' and \
self.worder.is_a_class_or_function_name_in_header(offset):
return True
return False
def get_pyname_at(self, offset):
return self.get_primary_and_pyname_at(offset)[1]
def get_primary_and_pyname_at(self, offset):
lineno = self.lines.get_line_number(offset)
holding_scope = self.module_scope.get_inner_scope_for_line(lineno)
# function keyword parameter
if self.worder.is_function_keyword_parameter(offset):
keyword_name = self.worder.get_word_at(offset)
pyobject = self.get_enclosing_function(offset)
if isinstance(pyobject, pyobjects.PyFunction):
return (None,
pyobject.get_parameters().get(keyword_name, None))
# class body
if self._is_defined_in_class_body(holding_scope, offset, lineno):
class_scope = holding_scope
if lineno == holding_scope.get_start():
class_scope = holding_scope.parent
name = self.worder.get_primary_at(offset).strip()
try:
return (None, class_scope.pyobject[name])
except rope.base.exceptions.AttributeNotFoundError:
return (None, None)
# function header
if self._is_function_name_in_function_header(holding_scope,
offset, lineno):
name = self.worder.get_primary_at(offset).strip()
return (None, holding_scope.parent[name])
# module in a from statement or an imported name that is aliased
if (self.worder.is_from_statement_module(offset) or
self.worder.is_import_statement_aliased_module(offset)):
module = self.worder.get_primary_at(offset)
module_pyname = self._find_module(module)
return (None, module_pyname)
if self.worder.is_from_aliased(offset):
name = self.worder.get_from_aliased(offset)
else:
name = self.worder.get_primary_at(offset)
return eval_str2(holding_scope, name)
def get_enclosing_function(self, offset):
function_parens = self.worder.find_parens_start_from_inside(offset)
try:
function_pyname = self.get_pyname_at(function_parens - 1)
except BadIdentifierError:
function_pyname = None
if function_pyname is not None:
pyobject = function_pyname.get_object()
if isinstance(pyobject, pyobjects.AbstractFunction):
return pyobject
elif isinstance(pyobject, pyobjects.AbstractClass) and \
'__init__' in pyobject:
return pyobject['__init__'].get_object()
elif '__call__' in pyobject:
return pyobject['__call__'].get_object()
return None
def _find_module(self, module_name):
dots = 0
while module_name[dots] == '.':
dots += 1
return rope.base.pynames.ImportedModule(
self.module_scope.pyobject, module_name[dots:], dots)
class StatementEvaluator(object):
def __init__(self, scope):
self.scope = scope
self.result = None
self.old_result = None
def _Name(self, node):
self.result = self.scope.lookup(node.id)
def _Attribute(self, node):
pyname = eval_node(self.scope, node.value)
if pyname is None:
pyname = rope.base.pynames.UnboundName()
self.old_result = pyname
if pyname.get_object() != rope.base.pyobjects.get_unknown():
try:
self.result = pyname.get_object()[node.attr]
except exceptions.AttributeNotFoundError:
self.result = None
def _Call(self, node):
primary, pyobject = self._get_primary_and_object_for_node(node.func)
if pyobject is None:
return
def _get_returned(pyobject):
args = arguments.create_arguments(primary, pyobject,
node, self.scope)
return pyobject.get_returned_object(args)
if isinstance(pyobject, rope.base.pyobjects.AbstractClass):
result = None
if '__new__' in pyobject:
new_function = pyobject['__new__'].get_object()
result = _get_returned(new_function)
if result is None or \
result == rope.base.pyobjects.get_unknown():
result = rope.base.pyobjects.PyObject(pyobject)
self.result = rope.base.pynames.UnboundName(pyobject=result)
return
pyfunction = None
if isinstance(pyobject, rope.base.pyobjects.AbstractFunction):
pyfunction = pyobject
elif '__call__' in pyobject:
pyfunction = pyobject['__call__'].get_object()
if pyfunction is not None:
self.result = rope.base.pynames.UnboundName(
pyobject=_get_returned(pyfunction))
def _Str(self, node):
self.result = rope.base.pynames.UnboundName(
pyobject=rope.base.builtins.get_str())
def _Num(self, node):
type_name = type(node.n).__name__
self.result = self._get_builtin_name(type_name)
def _Constant(self, node):
type_name = type(node.n).__name__
try:
self.result = self._get_builtin_name(type_name)
except exceptions.AttributeNotFoundError:
# XXX: Right way to fix this is to add missing NoneType to builtins?
pass
def _get_builtin_name(self, type_name):
pytype = rope.base.builtins.builtins[type_name].get_object()
return rope.base.pynames.UnboundName(
rope.base.pyobjects.PyObject(pytype))
def _BinOp(self, node):
self.result = rope.base.pynames.UnboundName(
self._get_object_for_node(node.left))
def _BoolOp(self, node):
pyobject = self._get_object_for_node(node.values[0])
if pyobject is None:
pyobject = self._get_object_for_node(node.values[1])
self.result = rope.base.pynames.UnboundName(pyobject)
def _Repr(self, node):
self.result = self._get_builtin_name('str')
def _UnaryOp(self, node):
self.result = rope.base.pynames.UnboundName(
self._get_object_for_node(node.operand))
def _Compare(self, node):
self.result = self._get_builtin_name('bool')
def _Dict(self, node):
keys = None
values = None
if node.keys and node.keys[0]:
keys, values = next(iter(filter(itemgetter(0), zip(node.keys, node.values))), (None, None))
if keys:
keys = self._get_object_for_node(keys)
if values:
values = self._get_object_for_node(values)
self.result = rope.base.pynames.UnboundName(
pyobject=rope.base.builtins.get_dict(keys, values))
def _List(self, node):
holding = None
if node.elts:
holding = self._get_object_for_node(node.elts[0])
self.result = rope.base.pynames.UnboundName(
pyobject=rope.base.builtins.get_list(holding))
def _ListComp(self, node):
pyobject = self._what_does_comprehension_hold(node)
self.result = rope.base.pynames.UnboundName(
pyobject=rope.base.builtins.get_list(pyobject))
def _GeneratorExp(self, node):
pyobject = self._what_does_comprehension_hold(node)
self.result = rope.base.pynames.UnboundName(
pyobject=rope.base.builtins.get_iterator(pyobject))
def _what_does_comprehension_hold(self, node):
scope = self._make_comprehension_scope(node)
pyname = eval_node(scope, node.elt)
return pyname.get_object() if pyname is not None else None
def _make_comprehension_scope(self, node):
scope = self.scope
module = scope.pyobject.get_module()
names = {}
for comp in node.generators:
new_names = _get_evaluated_names(comp.target, comp.iter, module,
'.__iter__().next()', node.lineno)
names.update(new_names)
return rope.base.pyscopes.TemporaryScope(scope.pycore, scope, names)
def _Tuple(self, node):
objects = []
if len(node.elts) < 4:
for stmt in node.elts:
pyobject = self._get_object_for_node(stmt)
objects.append(pyobject)
else:
objects.append(self._get_object_for_node(node.elts[0]))
self.result = rope.base.pynames.UnboundName(
pyobject=rope.base.builtins.get_tuple(*objects))
def _get_object_for_node(self, stmt):
pyname = eval_node(self.scope, stmt)
pyobject = None
if pyname is not None:
pyobject = pyname.get_object()
return pyobject
def _get_primary_and_object_for_node(self, stmt):
primary, pyname = eval_node2(self.scope, stmt)
pyobject = None
if pyname is not None:
pyobject = pyname.get_object()
return primary, pyobject
def _Subscript(self, node):
if isinstance(node.slice, ast.Index):
self._call_function(node.value, '__getitem__',
[node.slice.value])
elif isinstance(node.slice, ast.Slice):
self._call_function(node.value, '__getitem__',
[node.slice])
elif isinstance(node.slice, ast.expr):
self._call_function(node.value, '__getitem__',
[node.value])
def _Slice(self, node):
self.result = self._get_builtin_name('slice')
def _call_function(self, node, function_name, other_args=None):
pyname = eval_node(self.scope, node)
if pyname is not None:
pyobject = pyname.get_object()
else:
return
if function_name in pyobject:
called = pyobject[function_name].get_object()
if not called or \
not isinstance(called, pyobjects.AbstractFunction):
return
args = [node]
if other_args:
args += other_args
arguments_ = arguments.Arguments(args, self.scope)
self.result = rope.base.pynames.UnboundName(
pyobject=called.get_returned_object(arguments_))
def _Lambda(self, node):
self.result = rope.base.pynames.UnboundName(
pyobject=rope.base.builtins.Lambda(node, self.scope))
def _get_evaluated_names(targets, assigned, module, evaluation, lineno):
result = {}
for name, levels in astutils.get_name_levels(targets):
assignment = rope.base.pynames.AssignmentValue(assigned, levels,
evaluation)
# XXX: this module should not access `rope.base.pynamesdef`!
pyname = rope.base.pynamesdef.AssignedName(lineno, module)
pyname.assignments.append(assignment)
result[name] = pyname
return result