def parent_child(args, parentName, childName, findDescendant=False):
if len(args) != 1: raise XPathContext.FunctionNumArgs()
if len(args[0]) != 1: raise XPathContext.FunctionArgType(1,"xbrl:" + parentName)
parent = args[0][0]
if isinstance(parent,ModelObject) and \
parent.localName == parentName and parent.namespaceURI == XbrlConst.xbrli:
if childName.startswith('@'):
return parent.get(childName[1:])
elif childName == 'text()':
return XmlUtil.textNotStripped(parent)
elif childName == 'strip-text()':
return XmlUtil.text(parent)
elif findDescendant:
return XmlUtil.descendant(parent, XbrlConst.xbrli, childName)
else:
return XmlUtil.child(parent, XbrlConst.xbrli, childName)
raise XPathContext.FunctionArgType(1,"xbrl:" + parentName)
