Viewing file:  ParsedPredicateList.py (2.42 KB) -rw-r--r--
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########################################################################
#
# File Name: ParsedPredicateList.py
#
#
"""
A Parsed Token that represents a predicate list.
WWW: http://4suite.org/XPATH e-mail: support@4suite.org
Copyright (c) 2000-2001 Fourthought Inc, USA. All Rights Reserved.
See http://4suite.org/COPYRIGHT for license and copyright information
"""
from xml.xpath import Conversions
import types
NumberTypes = [types.IntType, types.LongType, types.FloatType]
class ParsedPredicateList:
def __init__(self, preds):
if type(preds) == type(()):
preds = list(preds)
elif not type(preds) == type([]):
raise "Invalid Predicates: ",str(preds)
self._predicates = preds
self._length = len(preds)
def append(self,pred):
self._predicates.append(pred)
self._length = self._length + 1
def filter(self, nodeList, context, reverse):
if self._length:
state = context.copyNodePosSize()
for pred in self._predicates:
size = len(nodeList)
ctr = 0
current = nodeList
nodeList = []
for node in current:
position = (reverse and size - ctr) or (ctr + 1)
context.setNodePosSize((node, position, size))
res = pred.evaluate(context)
if type(res) in NumberTypes:
# This must be separate to prevent falling into
# the boolean check.
if res == position:
nodeList.append(node)
elif Conversions.BooleanValue(res):
nodeList.append(node)
ctr = ctr + 1
context.setNodePosSize(state)
return nodeList
def __getitem__(self, index):
return self._predicates[index]
def __len__(self):
return self._length
def pprint(self, indent=''):
print indent + str(self)
for pred in self._predicates:
pred.pprint(indent + ' ')
def __str__(self):
return '<PredicateList at %x: %s>' % (
id(self),
repr(self) or '(empty)',
)
def __repr__(self):
return reduce(lambda result, pred:
result + '[%s]' % repr(pred),
self._predicates,
''
)
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