[IronPython] mapping C# iterators to Python iterator

[amit]

sorry for the bad indentation
this should be more readable.

class Dummy(object):
        def __init__(self, iterObj):
                self.iterObj = iterObj
                self.index = 0

        def next(self):
            temp = self.index
            if self.index == self.iterObj.Count:
                    raise StopIteration
            self.index = self.index + 1
            return self.iterObj.__getitem__(temp)


class CliClassWrapper(object):         # this is the class wrapper for 
on-the-fly class generation
    __slots__ = ('__cliobj__',)

    def __iter__(self):
        return Dummy(self)                     # this is where I pass 
the object


- Regmee


amit wrote:
> thanks tonnes Dino.
> :)
>
> I did as you said and got it working for ArrayList class.
> Now I am struggling with another issue
> the problem is in the below code wherein I could return ArrayList 
> values with __getitem__
> For other classes say 'Stack' though it wont work because it wont have 
> __getitem__
>
> I think I am missing something here. May be some sort of method 
> invocation to GetEnumerator(), MoveNext(), Current() could help.
>
> class Dummy(object):
>         def __init__(self, iterObj):
>                 self.iterObj = iterObj
>                 self.index = 0
>
>         def next(self):
>             temp = self.index
>             if self.index == self.iterObj.Count:
>                     raise StopIteration
>             self.index = self.index + 1
>             return self.iterObj.__getitem__(temp)
>
>
> class CliClassWrapper(object):         # this is the class wrapper for 
> on-the-fly class generation
>     __slots__ = ('__cliobj__',)
>
>     def __iter__(self):
>         return Dummy(self)                     # this is where I pass 
> the object
>
>
> - Regmee
>
>
> Dino Viehland wrote:
>> To map these to .NET's IEnumerator/IEnumerable you just need to 
>> define __iter__ or __getitem__.  If you define __iter__ you should 
>> return something that is enumerable (implements IEnumerable or has a 
>> next method which we'll call until it throws to stop enumeration).  
>> If you define __getitem__ we'll try and index from 0 to infinity and 
>> stop at an index out of range or stop iteration exception.
>>
>> You explicitly mention "say for ArrayList object" and I'm not sure 
>> what that means - we won't convert an arbitrary enumerable into 
>> another type such as ArrayList.  But we will convert it one of the 
>> enumeration interfaces.  When we pass your object out it'll be 
>> wrapped in one of our 
>> PythonEnumerable/PythonEnumerator/ItemEnumerable/ItemEnumerator classes.
>>
>> -----Original Message-----
>> From: users-bounces at lists.ironpython.com 
>> [mailto:users-bounces at lists.ironpython.com] On Behalf Of amit
>> Sent: Saturday, December 01, 2007 4:15 PM
>> To: users at lists.ironpython.com
>> Subject: [IronPython] mapping C# iterators to Python iterator
>>
>> Hi,
>>
>> I want to know how the "Iterators" in C# can be mapped to those in 
>> Python.
>> What I tried was:
>>
>> say for ArrayList object
>>
>>     def __iter__(self):
>>         self.index = self.Count
>>         return self
>>
>>     def next(self):
>>         if self.index == 0:
>>             raise StopIteration
>>         self.index = self.index - 1
>>         return ??
>>
>> If I am creating python classes dynamically how would I map
>> GetEnumerator() , MoveNext() , Current() , Reset()
>> to python Class so as to make it iterable inside python.
>>
>> --Regmee
>>
>>
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>>   
>
>