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import sys
import ast
import inspect
from collections import namedtuple
import executing.executing
from executing.executing import attr_names_match, Instruction
try:
from dis import Instruction as DisInstruction
except ImportError:
DisInstruction = None
executing.executing.TESTING = 1
from executing import Source
non_existing_argument=object()
class Tester(object):
def __init__(self):
self.decorators = []
self.__name__ = "" # weird pypy3.6 thing
def test_set_private_attrs(self):
# Test that attributes with leading __ are handled properly,
# as Python mangles their names.
self.a, self.aa, self._a, self.__a, self.__aa = range(5)
def check_decorators(self, expected):
assert self.decorators == expected, (self.decorators, expected)
self.decorators = []
def get_node(self, typ):
ex = self.get_executing(inspect.currentframe().f_back.f_back)
node = ex.node
assert isinstance(node, typ), (node, typ)
return node
def get_executing(self, frame):
Source.lazycache(frame)
return Source.executing(frame)
def check(self, node, value):
frame = inspect.currentframe().f_back.f_back
result = eval(
compile(ast.Expression(node), frame.f_code.co_filename, 'eval'),
frame.f_globals,
frame.f_locals,
)
assert result == value, (result, value)
def __call__(self, arg=non_existing_argument, check_func=True):
ex = self.get_executing(inspect.currentframe().f_back)
if ex.decorator:
assert {ex.node} == ex.statements
self.decorators.append(ex.node.decorator_list.index(ex.decorator))
else:
call = ex.node
if arg is non_existing_argument:
assert len(call.args)==0
else:
self.check(call.args[0], arg)
if check_func:
self.check(call.func, self)
if (
isinstance(call.parent, (ast.ClassDef, ast.FunctionDef))
and call in call.parent.decorator_list
):
return self
if arg is non_existing_argument:
return tester
else:
return arg
def __getattr__(self, item):
parent_frame=inspect.currentframe().f_back
# pytest is accessing tester to check if it is a test function
if "_pytest" not in parent_frame.f_code.co_filename:
node = self.get_node(ast.Attribute)
self.check(node.value, self)
assert node.attr == item
return self
def __getitem__(self, item):
node = self.get_node(ast.Subscript)
self.check(node.value, self)
self.check(subscript_item(node), item)
return self
def __setattr__(self, name, value):
if name in ('decorators', '__name__'):
super(Tester, self).__setattr__(name, value)
return
node = self.get_node(ast.Attribute)
self.check(node.value, self)
if node.attr.startswith('__'):
# Account for Python's name mangling of private attributes.
assert name == "_{self.__class__.__name__}{node.attr}".format(self=self, node=node)
else:
assert name == node.attr
assert attr_names_match(node.attr, name)
return self
def __delattr__(self, name):
node = self.get_node(ast.Attribute)
assert isinstance(node.ctx, ast.Del)
assert node.attr == name
def __setitem__(self, key, value):
node = self.get_node(ast.Subscript)
self.check(node.value, self)
if not isinstance(key, slice):
self.check(subscript_item(node), key)
return self
def __add__(self, other):
node = self.get_node(ast.BinOp)
self.check(node.left, self)
self.check(node.right, other)
return self
__pow__ = __mul__ = __sub__ = __add__
def __invert__(self):
node = self.get_node(ast.UnaryOp)
self.check(node.operand, self)
return self
__neg__ = __pos__ = __invert__
def __lt__(self, other):
node = self.get_node(ast.Compare)
self.check(node.left, self)
self.check(node.comparators[0], other)
return self
__ne__ = __ge__ = __lt__
def __bool__(self):
if sys.version_info >= (3, 11):
self.get_node(ast.BoolOp)
return False
else:
try:
self.get_node(None)
except RuntimeError:
return False
assert 0
def __enter__(self):
self.get_node(ast.With)
return self
def __exit__(self, exc_typ, exc_value, exc_traceback):
self.get_node(ast.With)
__nonzero__ = __bool__
tester = Tester()
def subscript_item(node):
if sys.version_info < (3, 9):
return node.slice.value
else:
return node.slice
def in_finally(node):
while hasattr(node, 'parent'):
if isinstance(node.parent, ast.Try) and node in node.parent.finalbody:
return True
node = node.parent
return False
SourcePosition = namedtuple("SourcePosition", ["lineno", "col_offset"])
def start_position(obj):
"""
returns the start source position as a (lineno,col_offset) tuple.
obj can be ast.AST or Instruction.
"""
if isinstance(obj, Instruction) or (DisInstruction is not None and isinstance(obj, DisInstruction)):
obj = obj.positions
if isinstance(obj,ast.Module):
obj=obj.body[0]
return SourcePosition(obj.lineno, obj.col_offset)
def end_position(obj):
"""
returns the end source position as a (lineno,col_offset) tuple.
obj can be ast.AST or Instruction.
"""
if sys.version_info < (3, 8):
return start_position(obj)
if isinstance(obj, Instruction) or (DisInstruction is not None and isinstance(obj, DisInstruction)):
obj = obj.positions
if isinstance(obj,ast.Module):
obj=obj.body[-1]
return SourcePosition(obj.end_lineno, obj.end_col_offset)
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