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# $Header: /var/local/cvsroot/4Suite/Ft/Xml/XPointer/__init__.py,v 1.11 2005/04/03 04:14:16 jkloth Exp $
"""
Module for XPointer processing
Copyright 2005 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
### Exceptions ###
from Ft import FtException
class XPtrException(FtException):
INTERNAL_ERROR = 1
SYNTAX_ERROR = 2
RESOURCE_ERROR = 3
SUB_RESOURCE_ERROR = 4
def __init__(self, errorCode, *args):
FtException.__init__(self, errorCode, MessageSource.g_errorMessages, args)
return
import MessageSource
### Convenience Functions ###
def SelectUri(uri, contextNode=None, nss=None):
"""
Parses the document with the given URI, and returns the node
corresponding to the XPointer given in the fragment of the URI.
uri must be an absolute URI reference. If it doesn't have a
fragment, returns the root node.
contextNode, if given, is the original XPointer context node
(e.g., from the referring document, if any; accessible in the
XPointer via the 'here' function).
nss is a set of explicit namespace mappings for use when evaluating
the XPointer (e.g., when the xmlns scheme isn't being used).
"""
from Ft.Lib.Uri import SplitFragment, PercentDecode
try:
from xml.sax.saxlib import SAXException
except ImportError:
from xml.sax import SAXException
from Ft.Xml import Domlette
base, fragment = SplitFragment(uri)
if fragment is None:
return reader.fromUri(base)
fragment = PercentDecode(fragment)
try:
doc = Domlette.NonvalidatingReader.parseUri(base)
except FtException:
# Already handled somewhere else
raise
except SAXException, exc:
raise XPtrException(XPtrException.RESOURCE_ERROR, str(exc))
except Exception, exc:
import traceback
traceback.print_exc()
raise XPtrException(XPtrException.INTERNAL_ERROR, str(exc))
return SelectNode(doc, fragment, nss, contextNode)
def SelectNode(doc, xpointer, nss=None, contextNode=None):
"""
Given a valid DOM node, evaluates an XPointer against it.
contextNode, if given, is the original XPointer context node
(e.g., from the referring document, if any; accessible in the
XPointer via the 'here' function).
nss is a set of explicit namespace mappings for use when evaluating
the XPointer (e.g., when the xmlns scheme isn't being used).
"""
parser = XPointerParser.new()
try:
xptr = parser.parse(xpointer)
except SyntaxError, exc:
raise XPtrException(XPtrException.SYNTAX_ERROR, str(exc))
except Exception, exc:
import traceback
traceback.print_exc()
raise XPtrException(XPtrException.INTERNAL_ERROR, str(exc))
context = XPtrContext.XPtrContext(doc, 1, 1, contextNode or doc, nss or {})
return xptr.select(context)
import XPointerParserc as XPointerParser
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