def test_access_undefined(self): expr = Expression("nothing", filename='index.html', lineno=50, lookup='lenient') retval = expr.evaluate({}) assert isinstance(retval, Undefined) self.assertEqual('nothing', retval._name) assert retval._owner is UNDEFINED
def test_lambda_tuple_arg(self): # This syntax goes away in Python 3 if not IS_PYTHON2: return data = {'items': [(1, 2), (2, 1)]} expr = Expression("filter(lambda (x, y): x > y, items)") self.assertEqual([(2, 1)], list(expr.evaluate(data)))
def test_getitem_undefined_string(self): class Something(object): def __repr__(self): return '<Something>' something = Something() expr = Expression('something["nil"]', filename='index.html', lineno=50, lookup='lenient') retval = expr.evaluate({'something': something}) assert isinstance(retval, Undefined) self.assertEqual('nil', retval._name) assert retval._owner is something
def test_lambda(self): # Define a custom `sorted` function cause the builtin isn't available # on Python 2.3 def sorted(items, compfunc): items.sort(compfunc) return items data = {'items': [{'name': 'b', 'value': 0}, {'name': 'a', 'value': 1}], 'sorted': sorted} expr = Expression("sorted(items, lambda a, b: cmp(a.name, b.name))") self.assertEqual([{'name': 'a', 'value': 1}, {'name': 'b', 'value': 0}], expr.evaluate(data))
def test_error_access_undefined(self): expr = Expression("nothing", filename='index.html', lineno=50, lookup='strict') try: expr.evaluate({}) self.fail('Expected UndefinedError') except UndefinedError, e: exc_type, exc_value, exc_traceback = sys.exc_info() frame = exc_traceback.tb_next frames = [] while frame.tb_next: frame = frame.tb_next frames.append(frame) self.assertEqual('"nothing" not defined', str(e)) self.assertEqual("<Expression 'nothing'>", frames[-3].tb_frame.f_code.co_name) self.assertEqual('index.html', frames[-3].tb_frame.f_code.co_filename) self.assertEqual(50, frames[-3].tb_lineno)
def test_list_comprehension(self): expr = Expression("[n for n in numbers if n < 2]") self.assertEqual([0, 1], expr.evaluate({'numbers': list(range(5))})) expr = Expression("[(i, n + 1) for i, n in enumerate(numbers)]") self.assertEqual([(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)], expr.evaluate({'numbers': list(range(5))})) expr = Expression("[offset + n for n in numbers]") self.assertEqual([2, 3, 4, 5, 6], expr.evaluate({'numbers': list(range(5)), 'offset': 2})) expr = Expression("[n for group in groups for n in group]") self.assertEqual([0, 1, 0, 1, 2], expr.evaluate({'groups': [list(range(2)), list(range(3))]})) expr = Expression("[(a, b) for a in x for b in y]") self.assertEqual([('x0', 'y0'), ('x0', 'y1'), ('x1', 'y0'), ('x1', 'y1')], expr.evaluate({'x': ['x0', 'x1'], 'y': ['y0', 'y1']}))
def test_generator_expression(self): expr = Expression("list(n for n in numbers if n < 2)") self.assertEqual([0, 1], expr.evaluate({'numbers': range(5)})) expr = Expression("list((i, n + 1) for i, n in enumerate(numbers))") self.assertEqual([(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)], expr.evaluate({'numbers': range(5)})) expr = Expression("list(offset + n for n in numbers)") self.assertEqual([2, 3, 4, 5, 6], expr.evaluate({'numbers': range(5), 'offset': 2})) expr = Expression("list(n for group in groups for n in group)") self.assertEqual([0, 1, 0, 1, 2], expr.evaluate({'groups': [range(2), range(3)]})) expr = Expression("list((a, b) for a in x for b in y)") self.assertEqual([('x0', 'y0'), ('x0', 'y1'), ('x1', 'y0'), ('x1', 'y1')], expr.evaluate({'x': ['x0', 'x1'], 'y': ['y0', 'y1']}))
def test_str_literal_non_ascii(self): expr = Expression(u"u'\xfe'") self.assertEqual(u'รพ', expr.evaluate({})) expr = Expression("u'\xfe'") self.assertEqual(u'รพ', expr.evaluate({})) expr = Expression("'\xc3\xbe'") self.assertEqual(u'รพ', expr.evaluate({}))
def test_error_getitem_undefined_string(self): class Something(object): def __repr__(self): return '<Something>' expr = Expression('something["nil"]', filename='index.html', lineno=50, lookup='strict') try: expr.evaluate({'something': Something()}) self.fail('Expected UndefinedError') except UndefinedError, e: self.assertEqual('<Something> has no member named "nil"', str(e)) exc_type, exc_value, exc_traceback = sys.exc_info() search_string = '''<Expression 'something["nil"]'>''' frame = exc_traceback.tb_next while frame.tb_next: frame = frame.tb_next code = frame.tb_frame.f_code if code.co_name == search_string: break else: self.fail("never found the frame I was looking for") self.assertEqual('index.html', code.co_filename) self.assertEqual(50, frame.tb_lineno)
def test_str_literal_non_ascii(self): expr = Expression(u"u'\xfe'") self.assertEqual(u'รพ', expr.evaluate({})) expr = Expression("u'\xfe'") self.assertEqual(u'รพ', expr.evaluate({})) # On Python2 strings are converted to unicode if they contained # non-ASCII characters. # On Py3k, we have no need to do this as non-prefixed strings aren't # raw. expr = Expression(wrapped_bytes(r"b'\xc3\xbe'")) if IS_PYTHON2: self.assertEqual(u'รพ', expr.evaluate({})) else: self.assertEqual(u'รพ'.encode('utf-8'), expr.evaluate({}))
def test_list_comprehension(self): expr = Expression("[n for n in numbers if n < 2]") self.assertEqual([0, 1], expr.evaluate({'numbers': range(5)})) expr = Expression("[(i, n + 1) for i, n in enumerate(numbers)]") self.assertEqual([(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)], expr.evaluate({'numbers': range(5)})) expr = Expression("[offset + n for n in numbers]") self.assertEqual([2, 3, 4, 5, 6], expr.evaluate({'numbers': range(5), 'offset': 2}))
def test_generator_expression(self): expr = Expression("list(n for n in numbers if n < 2)") self.assertEqual([0, 1], expr.evaluate({'numbers': range(5)})) expr = Expression("list((i, n + 1) for i, n in enumerate(numbers))") self.assertEqual([(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)], expr.evaluate({'numbers': range(5)})) expr = Expression("list(offset + n for n in numbers)") self.assertEqual([2, 3, 4, 5, 6], expr.evaluate({'numbers': range(5), 'offset': 2}))
def test_binop_xor(self): self.assertEqual(1, Expression("1 ^ 0").evaluate({})) self.assertEqual(1, Expression("x ^ y").evaluate({'x': 1, 'y': 0}))
def test_binop_mod(self): self.assertEqual(1, Expression("3 % 2").evaluate({})) self.assertEqual(1, Expression("x % y").evaluate({'x': 3, 'y': 2}))
def test_binop_div(self): self.assertEqual(2, Expression("4 / 2").evaluate({})) self.assertEqual(2, Expression("x / y").evaluate({'x': 4, 'y': 2}))
def test_binop_sub(self): self.assertEqual(1, Expression("2 - 1").evaluate({})) self.assertEqual(1, Expression("x - y").evaluate({'x': 2, 'y': 1}))
def test_unaryop_inv(self): self.assertEqual(-2, Expression("~1").evaluate({})) self.assertEqual(-2, Expression("~x").evaluate({'x': 1}))
def test_unaryop_neg(self): self.assertEqual(-1, Expression("-1").evaluate({})) self.assertEqual(-1, Expression("-x").evaluate({'x': 1}))
def test_hash(self): expr = Expression('x,y') self.assertEqual(hash(expr), hash(Expression('x,y'))) self.assertNotEqual(hash(expr), hash(Expression('y, x')))
def test_slice(self): expr = Expression("numbers[0:2]") self.assertEqual([0, 1], expr.evaluate({'numbers': range(5)}))
def test_conditional_expression(self): expr = Expression("'T' if foo else 'F'") self.assertEqual('T', expr.evaluate({'foo': True})) self.assertEqual('F', expr.evaluate({'foo': False}))
def test_generator_expression_with_getitem(self): items = [{'name': 'a', 'value': 1}, {'name': 'b', 'value': 2}] expr = Expression("list(i['name'] for i in items if i['value'] > 1)") self.assertEqual(['b'], expr.evaluate({'items': items}))
def test_name_lookup(self): self.assertEqual('bar', Expression('foo').evaluate({'foo': 'bar'})) self.assertEqual(id, Expression('id').evaluate({})) self.assertEqual('bar', Expression('id').evaluate({'id': 'bar'})) self.assertEqual(None, Expression('id').evaluate({'id': None}))
def test_list_comprehension_with_getitem(self): items = [{'name': 'a', 'value': 1}, {'name': 'b', 'value': 2}] expr = Expression("[i['name'] for i in items if i['value'] > 1]") self.assertEqual(['b'], expr.evaluate({'items': items}))
def test_lambda_tuple_arg(self): data = {'items': [(1, 2), (2, 1)]} expr = Expression("filter(lambda (x, y): x > y, items)") self.assertEqual([(2, 1)], expr.evaluate(data))
def test_lambda(self): data = {'items': range(5)} expr = Expression("filter(lambda x: x > 2, items)") self.assertEqual([3, 4], expr.evaluate(data))
def test_call_dstar_args(self): def foo(x): return x expr = Expression("foo(**bar)") self.assertEqual(42, expr.evaluate({'foo': foo, 'bar': {"x": 42}}))
def test_slice_with_vars(self): expr = Expression("numbers[start:end]") self.assertEqual([0, 1], expr.evaluate({'numbers': range(5), 'start': 0, 'end': 2}))
def test_dict_literal(self): self.assertEqual({}, Expression("{}").evaluate({})) self.assertEqual({'key': True}, Expression("{'key': value}").evaluate({'value': True}))
def test_slice_copy(self): expr = Expression("numbers[:]") self.assertEqual([0, 1, 2, 3, 4], expr.evaluate({'numbers': range(5)}))
def test_unaryop_not(self): self.assertEqual(False, Expression("not True").evaluate({})) self.assertEqual(False, Expression("not x").evaluate({'x': True}))
def test_slice_stride(self): expr = Expression("numbers[::stride]") self.assertEqual([0, 2, 4], expr.evaluate({'numbers': range(5), 'stride': 2}))
def test_binop_add(self): self.assertEqual(3, Expression("2 + 1").evaluate({})) self.assertEqual(3, Expression("x + y").evaluate({'x': 2, 'y': 1}))
def test_slice_negative_start(self): expr = Expression("numbers[-1:]") self.assertEqual([4], expr.evaluate({'numbers': range(5)}))
def test_binop_pow(self): self.assertEqual(4, Expression("2 ** 2").evaluate({})) self.assertEqual(4, Expression("x ** y").evaluate({'x': 2, 'y': 2}))
def test_slice_negative_end(self): expr = Expression("numbers[:-1]") self.assertEqual([0, 1, 2, 3], expr.evaluate({'numbers': range(5)}))
def test_binop_floordiv(self): self.assertEqual(1, Expression("3 // 2").evaluate({})) self.assertEqual(1, Expression("x // y").evaluate({'x': 3, 'y': 2}))
def test_compare_gt(self): self.assertEqual(True, Expression("2 > 1").evaluate({})) self.assertEqual(True, Expression("x > y").evaluate({'x': 2, 'y': 1}))
def test_binop_and(self): self.assertEqual(0, Expression("1 & 0").evaluate({})) self.assertEqual(0, Expression("x & y").evaluate({'x': 1, 'y': 0}))
def test_call_function(self): self.assertEqual(42, Expression("foo()").evaluate({'foo': lambda: 42})) data = {'foo': 'bar'} self.assertEqual('BAR', Expression("foo.upper()").evaluate(data)) data = {'foo': {'bar': range(42)}} self.assertEqual(42, Expression("len(foo.bar)").evaluate(data))
def test_compare_lt(self): self.assertEqual(True, Expression("1 < 2").evaluate({})) self.assertEqual(True, Expression("x < y").evaluate({'x': 1, 'y': 2}))
def test_list_literal(self): self.assertEqual([], Expression("[]").evaluate({})) self.assertEqual([1, 2, 3], Expression("[1, 2, 3]").evaluate({})) self.assertEqual([True], Expression("[value]").evaluate({'value': True}))
def test_compare_ge(self): self.assertEqual(True, Expression("1 >= 1").evaluate({})) self.assertEqual(True, Expression("x >= y").evaluate({'x': 1, 'y': 1}))
def test_eq(self): expr = Expression('x,y') self.assertEqual(expr, Expression('x,y')) self.assertNotEqual(expr, Expression('y, x'))
def test_builtins(self): expr = Expression('Markup') self.assertEqual(expr.evaluate({}), Markup)