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'þ', expr.evaluate({}))
expr = Expression("u'\xfe'")
self.assertEqual(u'þ', expr.evaluate({}))
expr = Expression("'\xc3\xbe'")
self.assertEqual(u'þ', 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'þ', expr.evaluate({}))
expr = Expression("u'\xfe'")
self.assertEqual(u'þ', 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'þ', expr.evaluate({}))
else:
self.assertEqual(u'þ'.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_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_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_eq(self):
expr = Expression('x,y')
self.assertEqual(expr, Expression('x,y'))
self.assertNotEqual(expr, Expression('y, x'))
def test_slice(self):
expr = Expression("numbers[0:2]")
self.assertEqual([0, 1], expr.evaluate({'numbers': range(5)}))
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_slice_negative_end(self):
expr = Expression("numbers[:-1]")
self.assertEqual([0, 1, 2, 3], expr.evaluate({'numbers': range(5)}))
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_builtins(self):
expr = Expression('Markup')
self.assertEqual(expr.evaluate({}), Markup)
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_builtins(self):
expr = Expression('Markup')
self.assertEqual(expr.evaluate({}), Markup)
def test_slice_copy(self):
expr = Expression("numbers[:]")
self.assertEqual([0, 1, 2, 3, 4], expr.evaluate({'numbers': range(5)}))
def test_slice_negative_start(self):
expr = Expression("numbers[-1:]")
self.assertEqual([4], expr.evaluate({'numbers': range(5)}))
