Re: RFC: rough draft of Python-style generators for elisp

[Daniel Colascione <dancol@dancol.org>]

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On 11/27/12 9:31 AM, Burton Samograd wrote:
> Daniel Colascione <dancol@dancol.org> writes:
> 
>> Over at https://github.com/dcolascione/elisp-generators, I have a
>> pure-elisp implementation of Python-style generators for elisp.
>> Perhaps the feature is best illustrate by example:
>>
>> (defgenerator mygen (i)
>>   (yield 1)
>>   (yield i)
>>   (yield 3))
>>
>> (let ((gen (mygen 100)))
>>   (list  (funcall gen)
>>          (funcall gen)
>>          (funcall gen)))
>>
>> -> (1 100 3)
>>
>> Yields can appear in arbitrary code:
>>
>> (defgenerator mygen2 (lim)
>>   (loop for x from 0 to lim do (yield x)))
>>
>> The package works by rewriting elisp into continuation-passing form
>> and closing over the resulting continuations with a driver loop that
>> transitions from one continuation-state to the next. After the last
>> yield, the facility signals generator-ended.
>>
>> Please take a look. It'd be nice if there were cl-loop extensions to
>> iterate over the things, and if generators were available with regular
>> defun the way yield is available with regular "def" in Python.
> 
> When I try and byte-compile your package I get the following:

Thanks for trying the package. I've updated it to use pcase, and I
fixed the compilation issues by side effect. A few warnings about
unused lexical variables remain, but I'm convinced these warnings are
spurious.

Please let me know if you have any other problems.


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