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Re: RFC: rough draft of Python-style generators for elisp
From: |
Daniel Colascione |
Subject: |
Re: RFC: rough draft of Python-style generators for elisp |
Date: |
Tue, 27 Nov 2012 15:24:19 -0600 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
On 11/27/12 9:31 AM, Burton Samograd wrote:
> Daniel Colascione <address@hidden> 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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