mirror of https://github.com/python/cpython
627 lines
19 KiB
Python
627 lines
19 KiB
Python
"""This module tests SyntaxErrors.
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Here's an example of the sort of thing that is tested.
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>>> def f(x):
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... global x
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Traceback (most recent call last):
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SyntaxError: name 'x' is parameter and global
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The tests are all raise SyntaxErrors. They were created by checking
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each C call that raises SyntaxError. There are several modules that
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raise these exceptions-- ast.c, compile.c, future.c, pythonrun.c, and
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symtable.c.
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The parser itself outlaws a lot of invalid syntax. None of these
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errors are tested here at the moment. We should add some tests; since
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there are infinitely many programs with invalid syntax, we would need
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to be judicious in selecting some.
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The compiler generates a synthetic module name for code executed by
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doctest. Since all the code comes from the same module, a suffix like
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[1] is appended to the module name, As a consequence, changing the
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order of tests in this module means renumbering all the errors after
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it. (Maybe we should enable the ellipsis option for these tests.)
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In ast.c, syntax errors are raised by calling ast_error().
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Errors from set_context():
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>>> obj.None = 1
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> None = 1
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Traceback (most recent call last):
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SyntaxError: can't assign to keyword
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>>> f() = 1
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Traceback (most recent call last):
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SyntaxError: can't assign to function call
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>>> del f()
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Traceback (most recent call last):
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SyntaxError: can't delete function call
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>>> a + 1 = 2
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Traceback (most recent call last):
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SyntaxError: can't assign to operator
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>>> (x for x in x) = 1
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Traceback (most recent call last):
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SyntaxError: can't assign to generator expression
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>>> 1 = 1
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Traceback (most recent call last):
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SyntaxError: can't assign to literal
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>>> "abc" = 1
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Traceback (most recent call last):
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SyntaxError: can't assign to literal
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>>> b"" = 1
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Traceback (most recent call last):
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SyntaxError: can't assign to literal
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>>> `1` = 1
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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If the left-hand side of an assignment is a list or tuple, an illegal
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expression inside that contain should still cause a syntax error.
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This test just checks a couple of cases rather than enumerating all of
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them.
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>>> (a, "b", c) = (1, 2, 3)
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Traceback (most recent call last):
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SyntaxError: can't assign to literal
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>>> [a, b, c + 1] = [1, 2, 3]
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Traceback (most recent call last):
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SyntaxError: can't assign to operator
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>>> a if 1 else b = 1
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Traceback (most recent call last):
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SyntaxError: can't assign to conditional expression
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From compiler_complex_args():
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>>> def f(None=1):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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From ast_for_arguments():
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>>> def f(x, y=1, z):
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... pass
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Traceback (most recent call last):
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SyntaxError: non-default argument follows default argument
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>>> def f(x, None):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> def f(*None):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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>>> def f(**None):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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From ast_for_funcdef():
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>>> def None(x):
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... pass
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Traceback (most recent call last):
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SyntaxError: invalid syntax
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From ast_for_call():
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>>> def f(it, *varargs):
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... return list(it)
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>>> L = range(10)
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>>> f(x for x in L)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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>>> f(x for x in L, 1)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized if not sole argument
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>>> f(x for x in L, y for y in L)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized if not sole argument
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>>> f((x for x in L), 1)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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>>> f(i0, i1, i2, i3, i4, i5, i6, i7, i8, i9, i10, i11,
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... i12, i13, i14, i15, i16, i17, i18, i19, i20, i21, i22,
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... i23, i24, i25, i26, i27, i28, i29, i30, i31, i32, i33,
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... i34, i35, i36, i37, i38, i39, i40, i41, i42, i43, i44,
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... i45, i46, i47, i48, i49, i50, i51, i52, i53, i54, i55,
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... i56, i57, i58, i59, i60, i61, i62, i63, i64, i65, i66,
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... i67, i68, i69, i70, i71, i72, i73, i74, i75, i76, i77,
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... i78, i79, i80, i81, i82, i83, i84, i85, i86, i87, i88,
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... i89, i90, i91, i92, i93, i94, i95, i96, i97, i98, i99,
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... i100, i101, i102, i103, i104, i105, i106, i107, i108,
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... i109, i110, i111, i112, i113, i114, i115, i116, i117,
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... i118, i119, i120, i121, i122, i123, i124, i125, i126,
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... i127, i128, i129, i130, i131, i132, i133, i134, i135,
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... i136, i137, i138, i139, i140, i141, i142, i143, i144,
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... i145, i146, i147, i148, i149, i150, i151, i152, i153,
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... i154, i155, i156, i157, i158, i159, i160, i161, i162,
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... i163, i164, i165, i166, i167, i168, i169, i170, i171,
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... i172, i173, i174, i175, i176, i177, i178, i179, i180,
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... i181, i182, i183, i184, i185, i186, i187, i188, i189,
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... i190, i191, i192, i193, i194, i195, i196, i197, i198,
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... i199, i200, i201, i202, i203, i204, i205, i206, i207,
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... i208, i209, i210, i211, i212, i213, i214, i215, i216,
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... i217, i218, i219, i220, i221, i222, i223, i224, i225,
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... i226, i227, i228, i229, i230, i231, i232, i233, i234,
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... i235, i236, i237, i238, i239, i240, i241, i242, i243,
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... i244, i245, i246, i247, i248, i249, i250, i251, i252,
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... i253, i254, i255)
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Traceback (most recent call last):
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SyntaxError: more than 255 arguments
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The actual error cases counts positional arguments, keyword arguments,
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and generator expression arguments separately. This test combines the
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three.
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>>> f(i0, i1, i2, i3, i4, i5, i6, i7, i8, i9, i10, i11,
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... i12, i13, i14, i15, i16, i17, i18, i19, i20, i21, i22,
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... i23, i24, i25, i26, i27, i28, i29, i30, i31, i32, i33,
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... i34, i35, i36, i37, i38, i39, i40, i41, i42, i43, i44,
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... i45, i46, i47, i48, i49, i50, i51, i52, i53, i54, i55,
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... i56, i57, i58, i59, i60, i61, i62, i63, i64, i65, i66,
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... i67, i68, i69, i70, i71, i72, i73, i74, i75, i76, i77,
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... i78, i79, i80, i81, i82, i83, i84, i85, i86, i87, i88,
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... i89, i90, i91, i92, i93, i94, i95, i96, i97, i98, i99,
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... i100, i101, i102, i103, i104, i105, i106, i107, i108,
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... i109, i110, i111, i112, i113, i114, i115, i116, i117,
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... i118, i119, i120, i121, i122, i123, i124, i125, i126,
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... i127, i128, i129, i130, i131, i132, i133, i134, i135,
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... i136, i137, i138, i139, i140, i141, i142, i143, i144,
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... i145, i146, i147, i148, i149, i150, i151, i152, i153,
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... i154, i155, i156, i157, i158, i159, i160, i161, i162,
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... i163, i164, i165, i166, i167, i168, i169, i170, i171,
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... i172, i173, i174, i175, i176, i177, i178, i179, i180,
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... i181, i182, i183, i184, i185, i186, i187, i188, i189,
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... i190, i191, i192, i193, i194, i195, i196, i197, i198,
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... i199, i200, i201, i202, i203, i204, i205, i206, i207,
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... i208, i209, i210, i211, i212, i213, i214, i215, i216,
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... i217, i218, i219, i220, i221, i222, i223, i224, i225,
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... i226, i227, i228, i229, i230, i231, i232, i233, i234,
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... i235, i236, i237, i238, i239, i240, i241, i242, i243,
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... (x for x in i244), i245, i246, i247, i248, i249, i250, i251,
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... i252=1, i253=1, i254=1, i255=1)
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Traceback (most recent call last):
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SyntaxError: more than 255 arguments
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>>> f(lambda x: x[0] = 3)
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Traceback (most recent call last):
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SyntaxError: lambda cannot contain assignment
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The grammar accepts any test (basically, any expression) in the
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keyword slot of a call site. Test a few different options.
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>>> f(x()=2)
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Traceback (most recent call last):
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SyntaxError: keyword can't be an expression
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>>> f(a or b=1)
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Traceback (most recent call last):
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SyntaxError: keyword can't be an expression
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>>> f(x.y=1)
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Traceback (most recent call last):
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SyntaxError: keyword can't be an expression
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More set_context():
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>>> (x for x in x) += 1
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Traceback (most recent call last):
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SyntaxError: can't assign to generator expression
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>>> None += 1
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Traceback (most recent call last):
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SyntaxError: can't assign to keyword
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>>> f() += 1
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Traceback (most recent call last):
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SyntaxError: can't assign to function call
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Test continue in finally in weird combinations.
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continue in for loop under finally should be ok.
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>>> def test():
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... try:
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... pass
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... finally:
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... for abc in range(10):
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... continue
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... print(abc)
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>>> test()
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9
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Start simple, a continue in a finally should not be allowed.
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>>> def test():
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... for abc in range(10):
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... try:
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... pass
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... finally:
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... continue
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Traceback (most recent call last):
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...
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SyntaxError: 'continue' not supported inside 'finally' clause
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This is essentially a continue in a finally which should not be allowed.
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>>> def test():
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... for abc in range(10):
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... try:
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... pass
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... finally:
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... try:
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... continue
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... except:
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... pass
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Traceback (most recent call last):
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...
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SyntaxError: 'continue' not supported inside 'finally' clause
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>>> def foo():
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... try:
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... pass
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... finally:
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... continue
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Traceback (most recent call last):
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...
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SyntaxError: 'continue' not supported inside 'finally' clause
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>>> def foo():
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... for a in ():
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... try:
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... pass
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... finally:
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... continue
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Traceback (most recent call last):
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...
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SyntaxError: 'continue' not supported inside 'finally' clause
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>>> def foo():
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... for a in ():
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... try:
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... pass
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... finally:
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... try:
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... continue
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... finally:
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... pass
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Traceback (most recent call last):
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...
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SyntaxError: 'continue' not supported inside 'finally' clause
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>>> def foo():
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... for a in ():
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... try: pass
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... finally:
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... try:
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... pass
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... except:
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... continue
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Traceback (most recent call last):
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...
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SyntaxError: 'continue' not supported inside 'finally' clause
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There is one test for a break that is not in a loop. The compiler
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uses a single data structure to keep track of try-finally and loops,
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so we need to be sure that a break is actually inside a loop. If it
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isn't, there should be a syntax error.
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>>> try:
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... print(1)
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... break
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... print(2)
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... finally:
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... print(3)
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Traceback (most recent call last):
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...
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SyntaxError: 'break' outside loop
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This raises a SyntaxError, it used to raise a SystemError.
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Context for this change can be found on issue #27514
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In 2.5 there was a missing exception and an assert was triggered in a debug
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build. The number of blocks must be greater than CO_MAXBLOCKS. SF #1565514
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>>> while 1:
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... while 2:
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... while 3:
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... while 4:
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... while 5:
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... while 6:
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... while 8:
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... while 9:
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... while 10:
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... while 11:
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... while 12:
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... while 13:
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... while 14:
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... while 15:
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... while 16:
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... while 17:
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... while 18:
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... while 19:
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... while 20:
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... while 21:
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... while 22:
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... break
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Traceback (most recent call last):
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...
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SyntaxError: too many statically nested blocks
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Misuse of the nonlocal and global statement can lead to a few unique syntax errors.
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>>> def f():
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... x = 1
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... global x
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Traceback (most recent call last):
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...
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SyntaxError: name 'x' is assigned to before global declaration
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>>> def f():
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... x = 1
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... def g():
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... print(x)
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... nonlocal x
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Traceback (most recent call last):
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...
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SyntaxError: name 'x' is used prior to nonlocal declaration
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>>> def f(x):
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... nonlocal x
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Traceback (most recent call last):
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...
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SyntaxError: name 'x' is parameter and nonlocal
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>>> def f():
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... global x
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... nonlocal x
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Traceback (most recent call last):
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...
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SyntaxError: name 'x' is nonlocal and global
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>>> def f():
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... nonlocal x
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Traceback (most recent call last):
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...
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SyntaxError: no binding for nonlocal 'x' found
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From SF bug #1705365
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>>> nonlocal x
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Traceback (most recent call last):
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...
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SyntaxError: nonlocal declaration not allowed at module level
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TODO(jhylton): Figure out how to test SyntaxWarning with doctest.
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## >>> def f(x):
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## ... def f():
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## ... print(x)
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## ... nonlocal x
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## Traceback (most recent call last):
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## ...
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## SyntaxWarning: name 'x' is assigned to before nonlocal declaration
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## >>> def f():
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## ... x = 1
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## ... nonlocal x
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## Traceback (most recent call last):
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## ...
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## SyntaxWarning: name 'x' is assigned to before nonlocal declaration
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From https://bugs.python.org/issue25973
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>>> class A:
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... def f(self):
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... nonlocal __x
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Traceback (most recent call last):
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...
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SyntaxError: no binding for nonlocal '_A__x' found
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This tests assignment-context; there was a bug in Python 2.5 where compiling
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a complex 'if' (one with 'elif') would fail to notice an invalid suite,
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leading to spurious errors.
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>>> if 1:
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... x() = 1
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... elif 1:
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... pass
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Traceback (most recent call last):
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...
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SyntaxError: can't assign to function call
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>>> if 1:
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... pass
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... elif 1:
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... x() = 1
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Traceback (most recent call last):
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...
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SyntaxError: can't assign to function call
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>>> if 1:
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... x() = 1
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... elif 1:
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... pass
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... else:
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... pass
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Traceback (most recent call last):
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...
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SyntaxError: can't assign to function call
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>>> if 1:
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... pass
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... elif 1:
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... x() = 1
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... else:
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... pass
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Traceback (most recent call last):
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...
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SyntaxError: can't assign to function call
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>>> if 1:
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... pass
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... elif 1:
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... pass
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... else:
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... x() = 1
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Traceback (most recent call last):
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...
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SyntaxError: can't assign to function call
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Make sure that the old "raise X, Y[, Z]" form is gone:
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>>> raise X, Y
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Traceback (most recent call last):
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...
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SyntaxError: invalid syntax
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>>> raise X, Y, Z
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Traceback (most recent call last):
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...
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SyntaxError: invalid syntax
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>>> f(a=23, a=234)
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Traceback (most recent call last):
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...
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SyntaxError: keyword argument repeated
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>>> {1, 2, 3} = 42
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Traceback (most recent call last):
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SyntaxError: can't assign to literal
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Corner-cases that used to fail to raise the correct error:
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>>> def f(*, x=lambda __debug__:0): pass
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Traceback (most recent call last):
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SyntaxError: assignment to keyword
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>>> def f(*args:(lambda __debug__:0)): pass
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Traceback (most recent call last):
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SyntaxError: assignment to keyword
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>>> def f(**kwargs:(lambda __debug__:0)): pass
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Traceback (most recent call last):
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SyntaxError: assignment to keyword
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>>> with (lambda *:0): pass
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Traceback (most recent call last):
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SyntaxError: named arguments must follow bare *
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Corner-cases that used to crash:
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>>> def f(**__debug__): pass
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Traceback (most recent call last):
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SyntaxError: assignment to keyword
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>>> def f(*xx, __debug__): pass
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Traceback (most recent call last):
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SyntaxError: assignment to keyword
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"""
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import re
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import unittest
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import warnings
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from test import support
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class SyntaxTestCase(unittest.TestCase):
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def _check_error(self, code, errtext,
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filename="<testcase>", mode="exec", subclass=None, lineno=None, offset=None):
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"""Check that compiling code raises SyntaxError with errtext.
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errtest is a regular expression that must be present in the
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test of the exception raised. If subclass is specified it
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is the expected subclass of SyntaxError (e.g. IndentationError).
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"""
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try:
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compile(code, filename, mode)
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except SyntaxError as err:
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if subclass and not isinstance(err, subclass):
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self.fail("SyntaxError is not a %s" % subclass.__name__)
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mo = re.search(errtext, str(err))
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if mo is None:
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self.fail("SyntaxError did not contain '%r'" % (errtext,))
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self.assertEqual(err.filename, filename)
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if lineno is not None:
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self.assertEqual(err.lineno, lineno)
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if offset is not None:
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self.assertEqual(err.offset, offset)
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else:
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self.fail("compile() did not raise SyntaxError")
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def test_assign_call(self):
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self._check_error("f() = 1", "assign")
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def test_assign_del(self):
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self._check_error("del f()", "delete")
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def test_global_err_then_warn(self):
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# Bug #763201: The SyntaxError raised for one global statement
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# shouldn't be clobbered by a SyntaxWarning issued for a later one.
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source = """if 1:
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def error(a):
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global a # SyntaxError
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def warning():
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b = 1
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global b # SyntaxWarning
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"""
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warnings.filterwarnings(action='ignore', category=SyntaxWarning)
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self._check_error(source, "global")
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warnings.filters.pop(0)
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def test_break_outside_loop(self):
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self._check_error("break", "outside loop")
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def test_unexpected_indent(self):
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self._check_error("foo()\n bar()\n", "unexpected indent",
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subclass=IndentationError)
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def test_no_indent(self):
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self._check_error("if 1:\nfoo()", "expected an indented block",
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subclass=IndentationError)
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def test_bad_outdent(self):
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self._check_error("if 1:\n foo()\n bar()",
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"unindent does not match .* level",
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subclass=IndentationError)
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def test_kwargs_last(self):
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self._check_error("int(base=10, '2')",
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"positional argument follows keyword argument")
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def test_kwargs_last2(self):
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self._check_error("int(**{base: 10}, '2')",
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"positional argument follows "
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"keyword argument unpacking")
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def test_kwargs_last3(self):
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self._check_error("int(**{base: 10}, *['2'])",
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"iterable argument unpacking follows "
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"keyword argument unpacking")
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def test_main():
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support.run_unittest(SyntaxTestCase)
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from test import test_syntax
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support.run_doctest(test_syntax, verbosity=True)
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if __name__ == "__main__":
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test_main()
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