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# $Header: /var/local/cvsroot/4Suite/Ft/Xml/Lib/__init__.py,v 1.5 2004/08/28 21:54:15 mbrown Exp $
"""
Functions, classes, modules that support Ft.Xml (4XML, Domlette, etc.)
Copyright 2004 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
import os
from xml.dom import Node
from Ft.Xml import XML_NAMESPACE
__all__ = ['Language']
def Language(node):
"""
This function returns the language property of the given instance of
xml.dom.Node, based on xml:lang attributes present on the node or
its ancestors. If no xml:lang attribute is present, returns None.
The language code, if any, is returned as an uppercase string.
"""
while node:
if node.nodeType == Node.DOCUMENT_NODE:
break
elif hasattr(node, 'hasAttributeNS') and node.hasAttributeNS(XML_NAMESPACE, 'lang'):
# found an xml:lang
value = node.getAttributeNS(XML_NAMESPACE, 'lang')
if value:
#Remove suffix if there is one (why?)
#index = value.find('-')
#if index != -1:
# value = value[:index]
value = value.upper()
# u'' -> None because XML 1.0 3rd Edition says xml:lang=""
# undefines the language. RDF/XML Syntax (Revised) agrees.
return value or None
else:
# go on to next ancestor
node = node.nodeType == Node.ATTRIBUTE_NODE and \
node.ownerElement or node.parentNode
# reached a Document node without finding an xml:lang
return None
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