590 lines
18 KiB
Python
590 lines
18 KiB
Python
"""This module tests SyntaxErrors.
|
|
|
|
Here's an example of the sort of thing that is tested.
|
|
|
|
>>> def f(x):
|
|
... global x
|
|
Traceback (most recent call last):
|
|
SyntaxError: name 'x' is parameter and global
|
|
|
|
The tests are all raise SyntaxErrors. They were created by checking
|
|
each C call that raises SyntaxError. There are several modules that
|
|
raise these exceptions-- ast.c, compile.c, future.c, pythonrun.c, and
|
|
symtable.c.
|
|
|
|
The parser itself outlaws a lot of invalid syntax. None of these
|
|
errors are tested here at the moment. We should add some tests; since
|
|
there are infinitely many programs with invalid syntax, we would need
|
|
to be judicious in selecting some.
|
|
|
|
The compiler generates a synthetic module name for code executed by
|
|
doctest. Since all the code comes from the same module, a suffix like
|
|
[1] is appended to the module name, As a consequence, changing the
|
|
order of tests in this module means renumbering all the errors after
|
|
it. (Maybe we should enable the ellipsis option for these tests.)
|
|
|
|
In ast.c, syntax errors are raised by calling ast_error().
|
|
|
|
Errors from set_context():
|
|
|
|
>>> obj.None = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid syntax
|
|
|
|
>>> None = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: assignment to keyword
|
|
|
|
It's a syntax error to assign to the empty tuple. Why isn't it an
|
|
error to assign to the empty list? It will always raise some error at
|
|
runtime.
|
|
|
|
>>> () = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to ()
|
|
|
|
>>> f() = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to function call
|
|
|
|
>>> del f()
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't delete function call
|
|
|
|
>>> a + 1 = 2
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to operator
|
|
|
|
>>> (x for x in x) = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to generator expression
|
|
|
|
>>> 1 = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to literal
|
|
|
|
>>> "abc" = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to literal
|
|
|
|
>>> `1` = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid syntax
|
|
|
|
If the left-hand side of an assignment is a list or tuple, an illegal
|
|
expression inside that contain should still cause a syntax error.
|
|
This test just checks a couple of cases rather than enumerating all of
|
|
them.
|
|
|
|
>>> (a, "b", c) = (1, 2, 3)
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to literal
|
|
|
|
>>> [a, b, c + 1] = [1, 2, 3]
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to operator
|
|
|
|
>>> a if 1 else b = 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to conditional expression
|
|
|
|
From compiler_complex_args():
|
|
|
|
>>> def f(None=1):
|
|
... pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid syntax
|
|
|
|
|
|
From ast_for_arguments():
|
|
|
|
>>> def f(x, y=1, z):
|
|
... pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: non-default argument follows default argument
|
|
|
|
>>> def f(x, None):
|
|
... pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid syntax
|
|
|
|
>>> def f(*None):
|
|
... pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid syntax
|
|
|
|
>>> def f(**None):
|
|
... pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid syntax
|
|
|
|
|
|
From ast_for_funcdef():
|
|
|
|
>>> def None(x):
|
|
... pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: invalid syntax
|
|
|
|
|
|
From ast_for_call():
|
|
|
|
>>> def f(it, *varargs):
|
|
... return list(it)
|
|
>>> L = range(10)
|
|
>>> f(x for x in L)
|
|
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
>>> f(x for x in L, 1)
|
|
Traceback (most recent call last):
|
|
SyntaxError: Generator expression must be parenthesized if not sole argument
|
|
>>> f((x for x in L), 1)
|
|
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
|
|
>>> f(i0, i1, i2, i3, i4, i5, i6, i7, i8, i9, i10, i11,
|
|
... i12, i13, i14, i15, i16, i17, i18, i19, i20, i21, i22,
|
|
... i23, i24, i25, i26, i27, i28, i29, i30, i31, i32, i33,
|
|
... i34, i35, i36, i37, i38, i39, i40, i41, i42, i43, i44,
|
|
... i45, i46, i47, i48, i49, i50, i51, i52, i53, i54, i55,
|
|
... i56, i57, i58, i59, i60, i61, i62, i63, i64, i65, i66,
|
|
... i67, i68, i69, i70, i71, i72, i73, i74, i75, i76, i77,
|
|
... i78, i79, i80, i81, i82, i83, i84, i85, i86, i87, i88,
|
|
... i89, i90, i91, i92, i93, i94, i95, i96, i97, i98, i99,
|
|
... i100, i101, i102, i103, i104, i105, i106, i107, i108,
|
|
... i109, i110, i111, i112, i113, i114, i115, i116, i117,
|
|
... i118, i119, i120, i121, i122, i123, i124, i125, i126,
|
|
... i127, i128, i129, i130, i131, i132, i133, i134, i135,
|
|
... i136, i137, i138, i139, i140, i141, i142, i143, i144,
|
|
... i145, i146, i147, i148, i149, i150, i151, i152, i153,
|
|
... i154, i155, i156, i157, i158, i159, i160, i161, i162,
|
|
... i163, i164, i165, i166, i167, i168, i169, i170, i171,
|
|
... i172, i173, i174, i175, i176, i177, i178, i179, i180,
|
|
... i181, i182, i183, i184, i185, i186, i187, i188, i189,
|
|
... i190, i191, i192, i193, i194, i195, i196, i197, i198,
|
|
... i199, i200, i201, i202, i203, i204, i205, i206, i207,
|
|
... i208, i209, i210, i211, i212, i213, i214, i215, i216,
|
|
... i217, i218, i219, i220, i221, i222, i223, i224, i225,
|
|
... i226, i227, i228, i229, i230, i231, i232, i233, i234,
|
|
... i235, i236, i237, i238, i239, i240, i241, i242, i243,
|
|
... i244, i245, i246, i247, i248, i249, i250, i251, i252,
|
|
... i253, i254, i255)
|
|
Traceback (most recent call last):
|
|
SyntaxError: more than 255 arguments
|
|
|
|
The actual error cases counts positional arguments, keyword arguments,
|
|
and generator expression arguments separately. This test combines the
|
|
three.
|
|
|
|
>>> f(i0, i1, i2, i3, i4, i5, i6, i7, i8, i9, i10, i11,
|
|
... i12, i13, i14, i15, i16, i17, i18, i19, i20, i21, i22,
|
|
... i23, i24, i25, i26, i27, i28, i29, i30, i31, i32, i33,
|
|
... i34, i35, i36, i37, i38, i39, i40, i41, i42, i43, i44,
|
|
... i45, i46, i47, i48, i49, i50, i51, i52, i53, i54, i55,
|
|
... i56, i57, i58, i59, i60, i61, i62, i63, i64, i65, i66,
|
|
... i67, i68, i69, i70, i71, i72, i73, i74, i75, i76, i77,
|
|
... i78, i79, i80, i81, i82, i83, i84, i85, i86, i87, i88,
|
|
... i89, i90, i91, i92, i93, i94, i95, i96, i97, i98, i99,
|
|
... i100, i101, i102, i103, i104, i105, i106, i107, i108,
|
|
... i109, i110, i111, i112, i113, i114, i115, i116, i117,
|
|
... i118, i119, i120, i121, i122, i123, i124, i125, i126,
|
|
... i127, i128, i129, i130, i131, i132, i133, i134, i135,
|
|
... i136, i137, i138, i139, i140, i141, i142, i143, i144,
|
|
... i145, i146, i147, i148, i149, i150, i151, i152, i153,
|
|
... i154, i155, i156, i157, i158, i159, i160, i161, i162,
|
|
... i163, i164, i165, i166, i167, i168, i169, i170, i171,
|
|
... i172, i173, i174, i175, i176, i177, i178, i179, i180,
|
|
... i181, i182, i183, i184, i185, i186, i187, i188, i189,
|
|
... i190, i191, i192, i193, i194, i195, i196, i197, i198,
|
|
... i199, i200, i201, i202, i203, i204, i205, i206, i207,
|
|
... i208, i209, i210, i211, i212, i213, i214, i215, i216,
|
|
... i217, i218, i219, i220, i221, i222, i223, i224, i225,
|
|
... i226, i227, i228, i229, i230, i231, i232, i233, i234,
|
|
... i235, i236, i237, i238, i239, i240, i241, i242, i243,
|
|
... (x for x in i244), i245, i246, i247, i248, i249, i250, i251,
|
|
... i252=1, i253=1, i254=1, i255=1)
|
|
Traceback (most recent call last):
|
|
SyntaxError: more than 255 arguments
|
|
|
|
>>> f(lambda x: x[0] = 3)
|
|
Traceback (most recent call last):
|
|
SyntaxError: lambda cannot contain assignment
|
|
|
|
The grammar accepts any test (basically, any expression) in the
|
|
keyword slot of a call site. Test a few different options.
|
|
|
|
>>> f(x()=2)
|
|
Traceback (most recent call last):
|
|
SyntaxError: keyword can't be an expression
|
|
>>> f(a or b=1)
|
|
Traceback (most recent call last):
|
|
SyntaxError: keyword can't be an expression
|
|
>>> f(x.y=1)
|
|
Traceback (most recent call last):
|
|
SyntaxError: keyword can't be an expression
|
|
|
|
|
|
More set_context():
|
|
|
|
>>> (x for x in x) += 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to generator expression
|
|
>>> None += 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: assignment to keyword
|
|
>>> f() += 1
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to function call
|
|
|
|
|
|
Test continue in finally in weird combinations.
|
|
|
|
continue in for loop under finally should be ok.
|
|
|
|
>>> def test():
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... for abc in range(10):
|
|
... continue
|
|
... print(abc)
|
|
>>> test()
|
|
9
|
|
|
|
Start simple, a continue in a finally should not be allowed.
|
|
|
|
>>> def test():
|
|
... for abc in range(10):
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... continue
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: 'continue' not supported inside 'finally' clause
|
|
|
|
This is essentially a continue in a finally which should not be allowed.
|
|
|
|
>>> def test():
|
|
... for abc in range(10):
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... try:
|
|
... continue
|
|
... except:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: 'continue' not supported inside 'finally' clause
|
|
|
|
>>> def foo():
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... continue
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: 'continue' not supported inside 'finally' clause
|
|
|
|
>>> def foo():
|
|
... for a in ():
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... continue
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: 'continue' not supported inside 'finally' clause
|
|
|
|
>>> def foo():
|
|
... for a in ():
|
|
... try:
|
|
... pass
|
|
... finally:
|
|
... try:
|
|
... continue
|
|
... finally:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: 'continue' not supported inside 'finally' clause
|
|
|
|
>>> def foo():
|
|
... for a in ():
|
|
... try: pass
|
|
... finally:
|
|
... try:
|
|
... pass
|
|
... except:
|
|
... continue
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: 'continue' not supported inside 'finally' clause
|
|
|
|
There is one test for a break that is not in a loop. The compiler
|
|
uses a single data structure to keep track of try-finally and loops,
|
|
so we need to be sure that a break is actually inside a loop. If it
|
|
isn't, there should be a syntax error.
|
|
|
|
>>> try:
|
|
... print(1)
|
|
... break
|
|
... print(2)
|
|
... finally:
|
|
... print(3)
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: 'break' outside loop
|
|
|
|
This should probably raise a better error than a SystemError (or none at all).
|
|
In 2.5 there was a missing exception and an assert was triggered in a debug
|
|
build. The number of blocks must be greater than CO_MAXBLOCKS. SF #1565514
|
|
|
|
>>> while 1:
|
|
... while 2:
|
|
... while 3:
|
|
... while 4:
|
|
... while 5:
|
|
... while 6:
|
|
... while 8:
|
|
... while 9:
|
|
... while 10:
|
|
... while 11:
|
|
... while 12:
|
|
... while 13:
|
|
... while 14:
|
|
... while 15:
|
|
... while 16:
|
|
... while 17:
|
|
... while 18:
|
|
... while 19:
|
|
... while 20:
|
|
... while 21:
|
|
... while 22:
|
|
... break
|
|
Traceback (most recent call last):
|
|
...
|
|
SystemError: too many statically nested blocks
|
|
|
|
Misuse of the nonlocal statement can lead to a few unique syntax errors.
|
|
|
|
>>> def f(x):
|
|
... nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: name 'x' is parameter and nonlocal
|
|
|
|
>>> def f():
|
|
... global x
|
|
... nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: name 'x' is nonlocal and global
|
|
|
|
>>> def f():
|
|
... nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: no binding for nonlocal 'x' found
|
|
|
|
From SF bug #1705365
|
|
>>> nonlocal x
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: nonlocal declaration not allowed at module level
|
|
|
|
TODO(jhylton): Figure out how to test SyntaxWarning with doctest.
|
|
|
|
## >>> def f(x):
|
|
## ... def f():
|
|
## ... print(x)
|
|
## ... nonlocal x
|
|
## Traceback (most recent call last):
|
|
## ...
|
|
## SyntaxWarning: name 'x' is assigned to before nonlocal declaration
|
|
|
|
## >>> def f():
|
|
## ... x = 1
|
|
## ... nonlocal x
|
|
## Traceback (most recent call last):
|
|
## ...
|
|
## SyntaxWarning: name 'x' is assigned to before nonlocal declaration
|
|
|
|
|
|
This tests assignment-context; there was a bug in Python 2.5 where compiling
|
|
a complex 'if' (one with 'elif') would fail to notice an invalid suite,
|
|
leading to spurious errors.
|
|
|
|
>>> if 1:
|
|
... x() = 1
|
|
... elif 1:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: can't assign to function call
|
|
|
|
>>> if 1:
|
|
... pass
|
|
... elif 1:
|
|
... x() = 1
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: can't assign to function call
|
|
|
|
>>> if 1:
|
|
... x() = 1
|
|
... elif 1:
|
|
... pass
|
|
... else:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: can't assign to function call
|
|
|
|
>>> if 1:
|
|
... pass
|
|
... elif 1:
|
|
... x() = 1
|
|
... else:
|
|
... pass
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: can't assign to function call
|
|
|
|
>>> if 1:
|
|
... pass
|
|
... elif 1:
|
|
... pass
|
|
... else:
|
|
... x() = 1
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: can't assign to function call
|
|
|
|
Make sure that the old "raise X, Y[, Z]" form is gone:
|
|
>>> raise X, Y
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: invalid syntax
|
|
>>> raise X, Y, Z
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: invalid syntax
|
|
|
|
|
|
>>> f(a=23, a=234)
|
|
Traceback (most recent call last):
|
|
...
|
|
SyntaxError: keyword argument repeated
|
|
|
|
>>> del ()
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't delete ()
|
|
|
|
>>> {1, 2, 3} = 42
|
|
Traceback (most recent call last):
|
|
SyntaxError: can't assign to literal
|
|
|
|
Corner-cases that used to fail to raise the correct error:
|
|
|
|
>>> def f(*, x=lambda __debug__:0): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: assignment to keyword
|
|
|
|
>>> def f(*args:(lambda __debug__:0)): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: assignment to keyword
|
|
|
|
>>> def f(**kwargs:(lambda __debug__:0)): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: assignment to keyword
|
|
|
|
>>> with (lambda *:0): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: named arguments must follow bare *
|
|
|
|
Corner-cases that used to crash:
|
|
|
|
>>> def f(**__debug__): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: assignment to keyword
|
|
|
|
>>> def f(*xx, __debug__): pass
|
|
Traceback (most recent call last):
|
|
SyntaxError: assignment to keyword
|
|
|
|
"""
|
|
|
|
import re
|
|
import unittest
|
|
import warnings
|
|
|
|
from test import support
|
|
|
|
class SyntaxTestCase(unittest.TestCase):
|
|
|
|
def _check_error(self, code, errtext,
|
|
filename="<testcase>", mode="exec", subclass=None):
|
|
"""Check that compiling code raises SyntaxError with errtext.
|
|
|
|
errtest is a regular expression that must be present in the
|
|
test of the exception raised. If subclass is specified it
|
|
is the expected subclass of SyntaxError (e.g. IndentationError).
|
|
"""
|
|
try:
|
|
compile(code, filename, mode)
|
|
except SyntaxError as err:
|
|
if subclass and not isinstance(err, subclass):
|
|
self.fail("SyntaxError is not a %s" % subclass.__name__)
|
|
mo = re.search(errtext, str(err))
|
|
if mo is None:
|
|
self.fail("SyntaxError did not contain '%r'" % (errtext,))
|
|
else:
|
|
self.fail("compile() did not raise SyntaxError")
|
|
|
|
def test_assign_call(self):
|
|
self._check_error("f() = 1", "assign")
|
|
|
|
def test_assign_del(self):
|
|
self._check_error("del f()", "delete")
|
|
|
|
def test_global_err_then_warn(self):
|
|
# Bug tickler: The SyntaxError raised for one global statement
|
|
# shouldn't be clobbered by a SyntaxWarning issued for a later one.
|
|
source = """if 1:
|
|
def error(a):
|
|
global a # SyntaxError
|
|
def warning():
|
|
b = 1
|
|
global b # SyntaxWarning
|
|
"""
|
|
warnings.filterwarnings(action='ignore', category=SyntaxWarning)
|
|
self._check_error(source, "global")
|
|
warnings.filters.pop(0)
|
|
|
|
def test_break_outside_loop(self):
|
|
self._check_error("break", "outside loop")
|
|
|
|
def test_unexpected_indent(self):
|
|
self._check_error("foo()\n bar()\n", "unexpected indent",
|
|
subclass=IndentationError)
|
|
|
|
def test_no_indent(self):
|
|
self._check_error("if 1:\nfoo()", "expected an indented block",
|
|
subclass=IndentationError)
|
|
|
|
def test_bad_outdent(self):
|
|
self._check_error("if 1:\n foo()\n bar()",
|
|
"unindent does not match .* level",
|
|
subclass=IndentationError)
|
|
|
|
def test_kwargs_last(self):
|
|
self._check_error("int(base=10, '2')", "non-keyword arg")
|
|
|
|
def test_main():
|
|
support.run_unittest(SyntaxTestCase)
|
|
from test import test_syntax
|
|
support.run_doctest(test_syntax, verbosity=True)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|