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� ��Wc @ sv d Z d d l Z d d l Z d d l Z d d l m Z d e j f d � � YZ d � Z e d k rr e � n d S( s�< 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 local and global (<doctest test.test_syntax[0]>, line 1) 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): File "<doctest test.test_syntax[1]>", line 1 SyntaxError: cannot assign to None >>> None = 1 Traceback (most recent call last): File "<doctest test.test_syntax[2]>", line 1 SyntaxError: cannot assign to None 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): File "<doctest test.test_syntax[3]>", line 1 SyntaxError: can't assign to () >>> f() = 1 Traceback (most recent call last): File "<doctest test.test_syntax[4]>", line 1 SyntaxError: can't assign to function call >>> del f() Traceback (most recent call last): File "<doctest test.test_syntax[5]>", line 1 SyntaxError: can't delete function call >>> a + 1 = 2 Traceback (most recent call last): File "<doctest test.test_syntax[6]>", line 1 SyntaxError: can't assign to operator >>> (x for x in x) = 1 Traceback (most recent call last): File "<doctest test.test_syntax[7]>", line 1 SyntaxError: can't assign to generator expression >>> 1 = 1 Traceback (most recent call last): File "<doctest test.test_syntax[8]>", line 1 SyntaxError: can't assign to literal >>> "abc" = 1 Traceback (most recent call last): File "<doctest test.test_syntax[8]>", line 1 SyntaxError: can't assign to literal >>> `1` = 1 Traceback (most recent call last): File "<doctest test.test_syntax[10]>", line 1 SyntaxError: can't assign to repr 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): File "<doctest test.test_syntax[11]>", line 1 SyntaxError: can't assign to literal >>> [a, b, c + 1] = [1, 2, 3] Traceback (most recent call last): File "<doctest test.test_syntax[12]>", line 1 SyntaxError: can't assign to operator >>> a if 1 else b = 1 Traceback (most recent call last): File "<doctest test.test_syntax[13]>", line 1 SyntaxError: can't assign to conditional expression From compiler_complex_args(): >>> def f(None=1): ... pass Traceback (most recent call last): File "<doctest test.test_syntax[14]>", line 1 SyntaxError: cannot assign to None From ast_for_arguments(): >>> def f(x, y=1, z): ... pass Traceback (most recent call last): File "<doctest test.test_syntax[15]>", line 1 SyntaxError: non-default argument follows default argument >>> def f(x, None): ... pass Traceback (most recent call last): File "<doctest test.test_syntax[16]>", line 1 SyntaxError: cannot assign to None >>> def f(*None): ... pass Traceback (most recent call last): File "<doctest test.test_syntax[17]>", line 1 SyntaxError: cannot assign to None >>> def f(**None): ... pass Traceback (most recent call last): File "<doctest test.test_syntax[18]>", line 1 SyntaxError: cannot assign to None From ast_for_funcdef(): >>> def None(x): ... pass Traceback (most recent call last): File "<doctest test.test_syntax[19]>", line 1 SyntaxError: cannot assign to None 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): File "<doctest test.test_syntax[23]>", line 1 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): File "<doctest test.test_syntax[25]>", line 1 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): File "<doctest test.test_syntax[26]>", line 1 SyntaxError: more than 255 arguments >>> f(lambda x: x[0] = 3) Traceback (most recent call last): File "<doctest test.test_syntax[27]>", line 1 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): File "<doctest test.test_syntax[28]>", line 1 SyntaxError: keyword can't be an expression >>> f(a or b=1) Traceback (most recent call last): File "<doctest test.test_syntax[29]>", line 1 SyntaxError: keyword can't be an expression >>> f(x.y=1) Traceback (most recent call last): File "<doctest test.test_syntax[30]>", line 1 SyntaxError: keyword can't be an expression More set_context(): >>> (x for x in x) += 1 Traceback (most recent call last): File "<doctest test.test_syntax[31]>", line 1 SyntaxError: can't assign to generator expression >>> None += 1 Traceback (most recent call last): File "<doctest test.test_syntax[32]>", line 1 SyntaxError: cannot assign to None >>> f() += 1 Traceback (most recent call last): File "<doctest test.test_syntax[33]>", line 1 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): ... File "<doctest test.test_syntax[36]>", line 6 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): ... File "<doctest test.test_syntax[37]>", line 6 SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... try: ... pass ... finally: ... continue Traceback (most recent call last): ... File "<doctest test.test_syntax[38]>", line 5 SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... for a in (): ... try: ... pass ... finally: ... continue Traceback (most recent call last): ... File "<doctest test.test_syntax[39]>", line 6 SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... for a in (): ... try: ... pass ... finally: ... try: ... continue ... finally: ... pass Traceback (most recent call last): ... File "<doctest test.test_syntax[40]>", line 7 SyntaxError: 'continue' not supported inside 'finally' clause >>> def foo(): ... for a in (): ... try: pass ... finally: ... try: ... pass ... except: ... continue Traceback (most recent call last): ... File "<doctest test.test_syntax[41]>", line 8 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): ... File "<doctest test.test_syntax[42]>", line 3 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 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): ... File "<doctest test.test_syntax[44]>", line 2 SyntaxError: can't assign to function call >>> if 1: ... pass ... elif 1: ... x() = 1 Traceback (most recent call last): ... File "<doctest test.test_syntax[45]>", line 4 SyntaxError: can't assign to function call >>> if 1: ... x() = 1 ... elif 1: ... pass ... else: ... pass Traceback (most recent call last): ... File "<doctest test.test_syntax[46]>", line 2 SyntaxError: can't assign to function call >>> if 1: ... pass ... elif 1: ... x() = 1 ... else: ... pass Traceback (most recent call last): ... File "<doctest test.test_syntax[47]>", line 4 SyntaxError: can't assign to function call >>> if 1: ... pass ... elif 1: ... pass ... else: ... x() = 1 Traceback (most recent call last): ... File "<doctest test.test_syntax[48]>", line 6 SyntaxError: can't assign to function call >>> f(a=23, a=234) Traceback (most recent call last): ... File "<doctest test.test_syntax[49]>", line 1 SyntaxError: keyword argument repeated >>> del () Traceback (most recent call last): ... File "<doctest test.test_syntax[50]>", line 1 SyntaxError: can't delete () >>> {1, 2, 3} = 42 Traceback (most recent call last): ... File "<doctest test.test_syntax[50]>", line 1 SyntaxError: can't assign to literal Corner-case that used to crash: >>> def f(*xx, **__debug__): pass Traceback (most recent call last): SyntaxError: cannot assign to __debug__ i����N( t test_supportt SyntaxTestCasec B st e Z d d d d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z RS( s <testcase>t execc C s� y t | | | � Wn~ t k r� } | rS t | | � rS | j d | j � n t j | t | � � } | d k r� | j d | | f � q� n X| j d � d S( s 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). s SyntaxError is not a %ss %s did not contain '%r's# compile() did not raise SyntaxErrorN( t compilet SyntaxErrort isinstancet failt __name__t ret searcht strt None( t selft codet errtextt filenamet modet subclasst errt mo( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt _check_error� s c C s | j d d � d S( Ns def f((x)=23): passs parenthesized arg with default( R ( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_paren_arg_with_default s c C s | j d d � d S( Ns f() = 1t assign( R ( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_assign_call s c C s | j d d � d S( Ns del f()t delete( R ( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_assign_del s c C sO t j d d d � } t j d d d t � | j | d � t j j d � d S( Ns (?m)^ *:t s� :def error(a): : global a # SyntaxError :def warning(): : b = 1 : global b # SyntaxWarning :t actiont ignoret categoryt globali ( R t subt warningst filterwarningst SyntaxWarningR t filterst pop( R t source( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_global_err_then_warn s c C s | j d d � d S( Nt breaks outside loop( R ( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_break_outside_loop s c C s) t j d d d � } | j | d � d S( Ns (?m)^ *:R sn :def foo(x): : def bar(): : print x : del x :s nested scope( R R R ( R R% ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_delete_deref s c C s | j d d d t �d S( Ns foo() bar() s unexpected indentR ( R t IndentationError( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_unexpected_indent$ s c C s | j d d d t �d S( Ns if 1: foo()s expected an indented blockR ( R R* ( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_no_indent( s c C s | j d d d t �d S( Ns if 1: foo() bar()s unindent does not match .* levelR ( R R* ( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_bad_outdent, s c C s | j d d � d S( Ns int(base=10, '2')s non-keyword arg( R ( R ( ( si /builddir/build/BUILDROOT/imh-python-2.7.12-1.el7.x86_64/opt/imh-python/lib/python2.7/test/test_syntax.pyt test_kwargs_last1 s N( R t __module__R R R R R R& R( R) R+ R, R- R. 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