[IronPython] [python] Re: Missing Compiler Flag

[Michael Foord]

Dino Viehland wrote:
> BTW the fix for this finally got checked in today (and therefore will be in the next release).  We don't yet pass all of test_codeop but we now pass half of it - we still have some issues w/ test_incomplete and test_valid.  But the flag is respected and appears to be doing the right thing now.
>   
That's really great news Dino. Thanks!

> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Dino Viehland
> Sent: Friday, September 21, 2007 4:20 PM
> To: Discussion of IronPython
> Subject: Re: [IronPython] [python] Re: Missing Compiler Flag
>
> Awesome, thanks for tracking this down.  I'll probably take a look at this next week.  This might have also provided some insight into how the Python command line works - so maybe that can be improved as a well (I just fixed a couple of those bugs but I'm sure we've got more lurking out there).
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
> Sent: Friday, September 21, 2007 3:05 PM
> To: Discussion of IronPython
> Subject: Re: [IronPython] [python] Re: Missing Compiler Flag
>
> Michael Foord wrote:
>   
>> Hello Dino,
>>
>> I think I've got it. With this flag set, the compile function will
>> return None *if* an indented line would be valid.
>>
>>     
>
> *so*... compile only returns a code object if the source code is
> complete. An indented code block is only complete when there is a dedent
> that completes the block.
>
> PyCF_DONT_IMPLY_DEDENT is a 'parser flag' which says "don't imply a
> dedent at the end of a block until we actually get an explicit dedent".
>
> All the best,
>
> Michael
> http://www.ironpython.info/
>
>
>
>
>   
>> This allows the interactive interpreter to decide which prompt to
>> present the user with (and whether to execute the code it has buffered
>> or to wait for more input).
>>
>> For example (from CPython):
>>
>> PyCF_DONT_IMPLY_DEDENT = 0x200
>> def _compile(source, filename, symbol):
>>     return compile(source, filename, symbol, PyCF_DONT_IMPLY_DEDENT)
>>
>> source = 'def x():\n    print x'
>> print _compile(source, 'test', 'single')
>> None
>>
>> Without the flag set returns a code object.
>>
>> There is similar code in the DLRConsole but it uses
>> "Microsoft.Scripting.SourceCodeUnit" which isn't present in 2.0a4.
>>
>> All the best,
>>
>> Michael
>> http://www.ironpython.info/
>>
>>
>> Dino Viehland wrote:
>>
>>     
>>> Ok, I closed 12908 as a dup.  If there's no info on it we can always try reverse engineering it (or see if test_codeop fails when we just ignore the flag instead of throwing - that might be the simplest thing to do).
>>>
>>> -----Original Message-----
>>> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
>>> Sent: Friday, September 21, 2007 1:23 PM
>>> To: Discussion of IronPython
>>> Subject: Re: [IronPython] [python] Re: Missing Compiler Flag
>>>
>>> Dino Viehland wrote:
>>>
>>>
>>>       
>>>> Strangely it doesn't seem to be in the documentation for compile() either :(
>>>>
>>>> Do you know what this option does by any chance :) ?
>>>>
>>>> I've opened bug #12908
>>>>
>>>>
>>>>         
>>> Great - it can go with 12907. :-)
>>>
>>> It is  something to do with dedenting. ;-)
>>>
>>> I can't find much about it on the intarwebz. It is defined in
>>> pythonrun.h and seems to be used in pythonrun.c and it is involved with
>>> parsing which makes sense.
>>>
>>> I'll try asking around. *sigh*
>>>
>>> Michael Foord
>>> http://www.manning.com/foord
>>>
>>>
>>>
>>>       
>>>> (http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=12908) so we at least have it tracked...
>>>>
>>>> -----Original Message-----
>>>> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
>>>> Sent: Friday, September 21, 2007 12:57 PM
>>>> To: Discussion of IronPython
>>>> Subject: [IronPython] Missing Compiler Flag
>>>>
>>>> Hello all,
>>>>
>>>> There's another problem with the interactive interpreter in IronPython
>>>> (it affects the ability to use the code standard library module).
>>>>
>>>> The PyCF_DONT_IMPLY_DEDENT compiler flag is not recognised in IronPython.
>>>>
>>>> The flag is defined in the 'codeop' standard library module:
>>>>
>>>> PyCF_DONT_IMPLY_DEDENT = 0x200          # Matches pythonrun.h
>>>>
>>>> Attempting to use this in IronPython:
>>>>
>>>>  >>> compile('print x', 'test', 'single', 0x200, 1)
>>>> Traceback (most recent call last):
>>>>   File , line 0, in <stdin>##1
>>>>   File , line 0, in Compile##4
>>>> ValueError: unrecognized flags
>>>>
>>>> Without this flag the code module can't recognize blocks of code with
>>>> several indented lines. :-(
>>>>
>>>> All the best,
>>>>
>>>>
>>>> Michael Foord
>>>> http://www.manning.com/foord
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>>>>
>>>>         
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