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Re: [ddlm-group] CIF header

• To: Group finalising DDLm and associated dictionaries <ddlm-group@iucr.org>
• Subject: Re: [ddlm-group] CIF header
• From: James Hester <jamesrhester@gmail.com>
• Date: Tue, 24 Nov 2009 09:45:17 +1100
• In-Reply-To: <4B0AE874.2080701@niehs.nih.gov>
• References: <C730D703.1259A%nick@csse.uwa.edu.au><4B0AE874.2080701@niehs.nih.gov>

Hi all: For the benefit of future readers, could all replies on the
subject of elides please go to the appropriate thread?  This thread is
for the CIF header string.  I will reinitiate the eliding straw poll
over on that thread...

On Tue, Nov 24, 2009 at 6:54 AM, Joe Krahn <krahn@niehs.nih.gov> wrote:
> Nick Spadaccini wrote:
>> What you have presented is not the substance of the difference in
>> approaches. What this shows is by choosing to consider the elide of a
>> terminal character ONLY when that is delimiting character that you get
>> differences in what is returned. James and I could have argued that any "
>> and ' that is elided is skipped. If that were the approach then our
>> algorithm would also be consistent in returning
>>
>> "ab\"cd" -> ab"cd
>> 'ab\"cd' -> ab"cd
>>
>> By the way this is the Python approach to elided terminals.
>>
>> The substance of the differences in the two approaches is what is
>> consistently done with terminating characters within delimited strings and
>> where is it done. We ague it is consistently done by the parser at write and
>> read and the user doesn't need to see it. You say the user is responsible at
>> both ends.
> That has been my argument as well. I don't think it makes any sense for
> the quoting method used by the parser/writer at the I/O level to change
> how the string is encoded. Some people apparently want dictionary
> control at the lowest level, including quote-specific escape sequences.
>
> I think we can compromise to a allow both approaches by avoiding rules
> that define how the conversions are implemented. See my post in the "Use
> of elides in strings" thread.
>
> Joe
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• References:
  • Re: [ddlm-group] CIF header (Nick Spadaccini)
  • Re: [ddlm-group] CIF header (Joe Krahn)

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