Viewing file:  XPointer.py (3.12 KB) -rw-r--r--
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########################################################################
#
# File Name: XPointer.py
#
# Docs: http://docs.4suite.org/XPointer/XPointer.py.html
#
"""
A Parsed Token that represents a list of XPointers
WWW: http://4suite.org/XPointer 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.dom import Node
from Ft.Xml.XPath import Util
from Ft.Xml.XPointer import XPtrException
class BareName:
def __init__(self, name):
self.name = name
def select(self, context):
doc = context.node.rootNode
if hasattr(doc, 'getElementById'):
element = doc.getElementById(self.name)
else:
# May raise ValueError
element = Util.GetElementById(doc, self.name)
if not element:
raise XPtrException(XPtrException.SUB_RESOURCE_ERROR)
return element
def pprint(self, indent=''):
print indent + str(self)
def __str__(self):
return '<BareName at %x: %s>' % (id(self), self.name)
def __repr__(self):
return self.name
class ChildSequence:
def __init__(self, sequence):
if type(sequence[0]) != type(1):
self.bareName = sequence[0]
self.sequence = sequence[1:]
else:
self.bareName = None
self.sequence = sequence
def select(self, context):
if self.bareName:
node = self.bareName.select(context)
else:
node = context.node.rootNode
for index in self.sequence:
elements = filter(lambda child:
child.nodeType == Node.ELEMENT_NODE,
node.childNodes)
try:
node = elements[index-1]
except IndexError:
raise XPtrException(XPtrException.SUB_RESOURCE_ERROR)
return node
def pprint(self, indent=''):
print indent + str(self)
def __str__(self):
return '<ChildSequence at %x: %s>' % (id(self), repr(self))
def __repr__(self):
result = self.bareName and repr(self.bareName) or ''
for index in self.sequence:
result = result + '/%d' % index
return result
class FullXPtr:
def __init__(self, parts):
self.parts = parts
def select(self, context):
for part in self.parts:
node_set = part.evaluate(context)
if len(node_set) == 1:
return node_set[0]
elif node_set:
# The scheme found more than 1 node
raise XPtrException(XPtrException.SUB_RESOURCE_ERROR)
# Nothing found, try the next one
# No schemes found an node
raise XPtrException(XPtrException.SUB_RESOURCE_ERROR)
def pprint(self, indent=''):
print indent + str(self)
for part in self.parts:
part.pprint(indent + ' ')
def __str__(self):
return '<FullXPtr at %x: %s>' % (id(self), repr(self))
def __repr__(self):
return ' '.join(map(lambda p: repr(p), self.parts))
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