Re: Deleting a subfield using MARC::Record

Edward Summers wrote:
> 
> On Apr 29, 2006, at 10:31 AM, Mark Jordan wrote:
>>  Maybe other people should verify the usefulness of a delete subfield 
>> function before anyone does anything about it, though. Would a half 
>> dozen +1 votes from perl4libers validate its usefulness?
> 
> Yes it would...but to get the changes out on CPAN we'd all need to 
> convince Mike O'Regan who holds the keys to MARC-Record on CPAN. Right 
> now the version on CPAN is not the latest version that's available in 
> CVS on SourceForge. I think Mike has some performance concerns about the 
> Unicode handling code in v2.0, since MARC::Record is used in some of his 
> time critical applications. Hopefully we can benchmark v1.38 and v2.0 
> sometime and get the latest code pushed out to CPAN if things look OK. 
> Or if this is not an option there is always the possibility of creating 
> a MARC::Record2 on CPAN. That would be kind of ugly for backwards 
> compatibility though.

OK -- here's the call for a vote. All interested perl4lib members are 
encouraged to participate by emailing the list.

Proposal: Incorporate the functions for deleting specific subfields into 
MARC-Record v2.0, based on examples Ed supplies below.

Process: +1 = Yes for Proposal, anything else = No and must be 
accompanied by reasons not to incorporate these features into v2.0.

Deadline: Midnight (Greenwich/UTC), Thursday May 4.


Mark

> 
> At any rate if you are open to using the latest/greatest code from 
> SourceForge there is nothing stopping us from getting a delete_subfield 
> method working.
> 
>> $field->delete_subfield('a', 0);
> 
> In the interests of flexibility how about using hash key/value pairs? 
> Here's what I'm thinking:
> 
> # delete all subfield u
> $field->delete_subfield(code => 'u');
> 
> # delete first two subfield u
> $field->delete_subfield(code => 'u', count => 2);
> 
> # delete all subfield u that have 'zombo.com' in them
> $field->delete_subfield(code => 'u', match = qr/zombo\.com/);
> 
> # delete only the first subfield u that has 'zombo.com' in it
> $field->delete_subfield(code => 'u', match => qr/zombo\.com', count => 1);
> 
> # delete any subfield with a value that matches 'zombo.com'
> $field->delete_subfield(match => qr/zombo\.com/);
> 
> So effectively there is AND boolean logic between any options that are 
> supplied. If this looks good I've got some code that does it and some 
> tests committed in SourceForge for you to take a look at [1]. I'm open 
> to suggestions on renaming parameters, etc... Here are the basics for 
> checking out the code if you haven't done it before.
> 
>      cvs -d:pserver:[email protected]:/cvsroot/marcpm login
> 
>      cvs -z3 -d:pserver:[email protected]:/cvsroot/marcpm co 
> -P marc-record
> 
> //Ed
> 
> [1] http://sourceforge.net/cvs/?group_id=1254