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S2.py
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Wed, Jan 8, 05:53

S2.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.
#
"""
(Data structures for stage 2 of the formatter)
"""
from Pyblio.Format.S3 import Tag
from Pyblio.Format.Base import Missing
def T(*args):
return Tag('t', args, {})
class Text(object):
def __init__(self, t):
self.t = t
return
def __call__(self, record):
return unicode(self.t)
def __repr__(self):
return "S2.Text(%r)" % self.t
class Sum(object):
def __init__(self, a, b):
self.a = a
self.b = b
return
def __call__(self, record):
# The sum fails if one of the two members fails
return T(self.a(record), self.b(record))
def __repr__(self):
return "S2.Sum(%r, %r)" % (self.a, self.b)
class Or(object):
def __init__(self, a, b):
self.a = a
self.b = b
return
def __call__(self, record):
# Return b except if a is defined
try:
return self.a(record)
except Missing:
return self.b(record)
def __repr__(self):
return "S2.Or(%r, %r)" % (self.a, self.b)
class Join(object):
def __init__(self, middle, last, children):
self.middle = middle
self.last = last
self.children = children
return
def __call__(self, record):
middle = self.middle(record)
last = self.last(record)
ls = []
for arg in self.children:
if isinstance (arg, (str, unicode)):
ls.append (arg)
continue
try: v = arg(record)
except Missing: continue
if isinstance (v, (list, tuple)):
ls.extend(v)
else:
ls.append (v)
if len(ls) == 0:
raise Missing('empty join')
f = [ls.pop (0)]
while ls:
l = ls.pop (0)
if ls: f.append(middle)
else: f.append(last)
f.append(l)
return T(*f)
def __repr__(self):
return "S2.Join(%r, %r, %r)" % (
self.middle, self.last, self.children)
class Switch(object):
def __init__(self, fetch, switch, default):
self.fetch = fetch
self.switch = switch
self.default = default
return
def __call__(self, record):
try:
txo = self.fetch(record)
except (KeyError, IndexError), msg:
if self.default:
c = self.default
else:
raise Missing('no such attribute in record: %s' % str(msg))
else:
c = self.switch.get(txo, self.default)
if not c:
raise Missing('unsupported switch case')
return c(record)

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