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bfe_field.py
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Mon, May 20, 19:53

bfe_field.py
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# -*- coding: utf-8 -*-
##
## $Id$
##
## This file is part of CDS Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 CERN.
##
## CDS Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## CDS Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with CDS Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""BibFormat element - Prints a custom field
"""
__revision__ = "$Id$"
from invenio.bibformat_utils import parse_tag
def format(bfo, tag, limit, instances_separator=" ", subfields_separator=" "):
"""
Prints the given field of a record.
If tag is in range [001, 010], this element assumes
that it accesses a control field. Else it considers it
accesses a data field.
@param tag the tag code of the field that is to be printed
@param instances_separator a separator between instances of field
@param subfields_separator a separator between subfields of an instance
@param limit the maximum number of values to display.
"""
# check if data or control field
p_tag = parse_tag(tag)
if p_tag[0].isdigit() and int(p_tag[0]) in range(0, 11):
return bfo.control_field(tag)
elif p_tag[0].isdigit():
#Get values without subcode. We will filter unneeded subcode later
values = bfo.fields(p_tag[0]+p_tag[1]+p_tag[2])
else:
return ''
out = ""
if limit == "" or (not limit.isdigit()) or limit > len(values):
limit = len(values)
if len(values) > 0 and isinstance(values[0], dict):
x = 0
for instance in values:
filtered_values = [value for (subcode, value) in instance.iteritems()
if p_tag[3] == '' or p_tag[3] == '%' or p_tag[3] == subcode]
if filtered_values:
x += 1
out += subfields_separator.join(filtered_values)
if x >= limit:
break
# Print separator between non-empty instances, and if not last instance
if x < len(values) and filtered_values:
out += instances_separator
else:
out += subfields_separator.join(values[:int(limit)])
return out

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