########################################################################
#
# File Name:   ParsedAbbreviatedAbsoluteLocationPath.py
#
#
"""
A parsed token for an abreviated absolute location path.
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 ParsedNodeTest
from xml.xpath import ParsedPredicateList
from xml.xpath import ParsedStep
from xml.xpath import ParsedAxisSpecifier

LOOKAHEAD_OPTIMIZERS = {
    }

class ParsedAbbreviatedAbsoluteLocationPath:
    def __init__(self,rel):
        self._rel = rel
        nt = ParsedNodeTest.ParsedNodeTest('node', '')
        ppl = ParsedPredicateList.ParsedPredicateList([])
        pas = ParsedAxisSpecifier.ParsedAxisSpecifier('descendant-or-self')
        self._step = ParsedStep.ParsedStep(pas, nt, ppl)
        return

    def evaluate(self, context):
        origState = context.copyNodePosSize()

        root = context.node.ownerDocument or context.node
        context.setNodePosSize((root,1,1))
        rt = self._step.select(context)
        res = []
        l = len(rt)
        
        sub_rt = []
        for ctr in range(l):
            n = rt[ctr]
            context.setNodePosSize((n,ctr+1,l))
            sub_rt.extend(self._rel.select(context))

        if sub_rt and hasattr(sub_rt[0], 'ownerElement'):
            result = sub_rt
        else:
            result = filter(lambda x, compare=sub_rt: x in compare, rt)

        context.setNodePosSize(origState)
        return result
    select = evaluate
    
    def pprint(self, indent=''):
        print indent + str(self)
        self._step.pprint(indent + '  ')
        self._rel.pprint(indent + '  ')

    def __str__(self):
        return '<AbbreviatedAbsoluteLocationPath at %x: %s>' % (
            id(self),
            repr(self)
            )

    def __repr__(self):
        return '/%s/%s' % (repr(self._step), repr(self._rel))
        
