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Sort.py
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Wed, Jun 5, 14:15

Sort.py
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# This file is part of pybliographer
#
# Copyright (C) 1998-2006 Frederic GOBRY
# Email : gobry@pybliographer.org
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""
Definition of the sort language.
Sorting according to fields A (ascending) and B (descending) can be
written::
OrderBy ('A') & OrderBy ('B', asc = False)
"""
def compare (a, b):
for (sa, va), (sb, vb) in zip (a, b):
r = cmp (va, vb)
if r: return r * sa
return 0
class _Base (object):
def __and__ (self, other):
return _Seq (self, other)
class _Seq (_Base):
def __init__ (self, a, b):
self.a = a
self.b = b
return
def cmp_key (self, rec):
return self.a.cmp_key (rec) + self.b.cmp_key (rec)
class OrderBy (_Base):
def __init__ (self, field, asc = True):
self.field = field
if asc: self.asc = +1
else: self.asc = -1
return
def cmp_key (self, rec):
try:
parts = [ x.sort () for x in rec [self.field] ]
except KeyError:
parts = []
return (self.asc, parts),

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