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########################################################################
#
# File Name: Element.py
#
#
"""
WWW: http://4suite.com/4DOM e-mail: support@4suite.com
Copyright (c) 2000 Fourthought Inc, USA. All Rights Reserved.
See http://4suite.com/COPYRIGHT for license and copyright information
"""
from DOMImplementation import implementation
from FtNode import FtNode, get_name_pattern
import Event
from xml.dom import Node
from xml.dom import XML_NAMESPACE
from xml.dom import EMPTY_NAMESPACE
from xml.dom import InvalidCharacterErr
from xml.dom import WrongDocumentErr
from xml.dom import InuseAttributeErr
from xml.dom import NotFoundErr
from xml.dom import SyntaxErr
from xml.dom import NamespaceErr
from ext import SplitQName, IsDOMString
class Element(FtNode):
nodeType = Node.ELEMENT_NODE
_allowedChildren = [Node.ELEMENT_NODE,
Node.TEXT_NODE,
Node.COMMENT_NODE,
Node.PROCESSING_INSTRUCTION_NODE,
Node.CDATA_SECTION_NODE,
Node.ENTITY_REFERENCE_NODE
]
def __init__(self, ownerDocument, nodeName, namespaceURI, prefix, localName):
FtNode.__init__(self, ownerDocument, namespaceURI, prefix, localName);
#Set our attributes
self.__dict__['__attributes'] = implementation._4dom_createNamedNodeMap(ownerDocument)
self.__dict__['__nodeName'] = nodeName
### Attribute Methods ###
def _get_tagName(self):
return self.__dict__['__nodeName']
### Methods ###
def getAttribute(self, name):
att = self.attributes.getNamedItem(name)
return att and att.value or ''
def getAttributeNode(self, name):
return self.attributes.getNamedItem(name)
def getElementsByTagName(self, tagName):
nodeList = implementation._4dom_createNodeList()
elements = filter(lambda node, type=Node.ELEMENT_NODE:
node.nodeType == type,
self.childNodes)
for element in elements:
if tagName == '*' or element.tagName == tagName:
nodeList.append(element)
nodeList.extend(list(element.getElementsByTagName(tagName)))
return nodeList
def hasAttribute(self, name):
return self.attributes.getNamedItem(name) is not None
def removeAttribute(self, name):
# Return silently if no node
node = self.attributes.getNamedItem(name)
if node:
self.removeAttributeNode(node)
def removeAttributeNode(self, node):
# NamedNodeMap will raise exception if needed
try:
self.attributes.removeNamedItemNS(node.namespaceURI, node.localName)
except NotFoundErr:
self.attributes.removeNamedItem(node.name)
node._4dom_setOwnerElement(None)
self._4dom_fireMutationEvent('DOMAttrModified',
relatedNode=node,
attrName=node.name,
attrChange=Event.MutationEvent.REMOVAL)
self._4dom_fireMutationEvent('DOMSubtreeModified')
return node
def setAttribute(self, name, value):
if not IsDOMString(value):
raise SyntaxErr()
if not get_name_pattern().match(name):
raise InvalidCharacterErr()
attr = self.attributes.getNamedItem(name)
if attr:
attr.value = value
else:
attr = self.ownerDocument.createAttribute(name)
attr.value = value
self.setAttributeNode(attr)
# the mutation event is fired in Attr.py
def setAttributeNode(self, node):
if node.ownerDocument != self.ownerDocument:
raise WrongDocumentErr()
if node.ownerElement not in (None, self):
# Already an attribute of another Element object.
raise InuseAttributeErr()
old = self.attributes.getNamedItem(node.name)
if old:
self._4dom_fireMutationEvent('DOMAttrModified',
relatedNode=old,
prevValue=old.value,
attrName=old.name,
attrChange=Event.MutationEvent.REMOVAL)
self.attributes.setNamedItem(node)
node._4dom_setOwnerElement(self)
self._4dom_fireMutationEvent('DOMAttrModified',
relatedNode=node,
newValue=node.value,
attrName=node.name,
attrChange=Event.MutationEvent.ADDITION)
self._4dom_fireMutationEvent('DOMSubtreeModified')
return old
### DOM Level 2 Methods ###
def getAttributeNS(self, namespaceURI, localName):
attr = self.attributes.getNamedItemNS(namespaceURI, localName)
return attr and attr.value or ''
def getAttributeNodeNS(self, namespaceURI, localName):
return self.attributes.getNamedItemNS(namespaceURI, localName)
def getElementsByTagNameNS(self, namespaceURI, localName):
if namespaceURI == '':
raise NamespaceErr("Use None instead of '' for empty namespace")
nodeList = implementation._4dom_createNodeList()
elements = filter(lambda node, type=Node.ELEMENT_NODE:
node.nodeType == type,
self.childNodes)
for element in elements:
if ((namespaceURI == '*' or element.namespaceURI == namespaceURI)
and (localName == '*' or element.localName == localName)):
nodeList.append(element)
nodeList.extend(list(element.getElementsByTagNameNS(namespaceURI,
localName)))
return nodeList
def hasAttributeNS(self, namespaceURI, localName):
return self.attributes.getNamedItemNS(namespaceURI, localName) is not None
def removeAttributeNS(self, namespaceURI, localName):
# Silently return if not attribute
node = self.attributes.getNamedItemNS(namespaceURI, localName)
if node:
self.removeAttributeNode(node)
return
def setAttributeNS(self, namespaceURI, qualifiedName, value):
if not IsDOMString(value):
raise SyntaxErr()
if not get_name_pattern().match(qualifiedName):
raise InvalidCharacterErr()
prefix, localName = SplitQName(qualifiedName)
attr = self.attributes.getNamedItemNS(namespaceURI, localName)
if attr:
attr.value = value
else:
attr = self.ownerDocument.createAttributeNS(namespaceURI, qualifiedName)
attr.value = value
self.setAttributeNodeNS(attr)
return
def setAttributeNodeNS(self, node):
if self.ownerDocument != node.ownerDocument:
raise WrongDocumentErr()
if node.ownerElement not in (None, self):
# Already an attribute of another Element object.
raise InuseAttributeErr()
old = self.attributes.getNamedItemNS(node.namespaceURI, node.localName)
if old:
self._4dom_fireMutationEvent('DOMAttrModified',
relatedNode=old,
prevValue=old.value,
attrName=old.name,
attrChange=Event.MutationEvent.REMOVAL)
self.attributes.setNamedItemNS(node)
node._4dom_setOwnerElement(self)
self._4dom_fireMutationEvent('DOMAttrModified',
relatedNode=node,
newValue=node.value,
attrName=node.name,
attrChange=Event.MutationEvent.ADDITION)
self._4dom_fireMutationEvent('DOMSubtreeModified')
return old
### Overridden Methods ###
def __repr__(self):
return "<Element Node at %x: Name='%s' with %d attributes and %d children>" % (
id(self),
self.nodeName,
len(self.attributes),
len(self.childNodes)
)
# Behind the back setting of element's ownerDocument
# Also sets the owner of the NamedNodeMaps
def _4dom_setOwnerDocument(self, newOwner):
self.__dict__['__ownerDocument'] = newOwner
self.__dict__['__attributes']._4dom_setOwnerDocument(newOwner)
### Helper Functions For Cloning ###
def _4dom_clone(self, owner):
e = self.__class__(owner,
self.nodeName,
self.namespaceURI,
self.prefix,
self.localName)
for attr in self.attributes:
clone = attr._4dom_clone(owner)
if clone.localName is None:
e.attributes.setNamedItem(clone)
else:
e.attributes.setNamedItemNS(clone)
clone._4dom_setOwnerElement(e)
return e
def __getinitargs__(self):
return (self.ownerDocument,
self.nodeName,
self.namespaceURI,
self.prefix,
self.localName
)
def __getstate__(self):
return (self.childNodes, self.attributes)
def __setstate__(self, (children, attrs)):
FtNode.__setstate__(self, children)
self.__dict__['__attributes'] = attrs
for attr in attrs:
attr._4dom_setOwnerElement(self)
### Attribute Access Mappings ###
_readComputedAttrs = FtNode._readComputedAttrs.copy()
_readComputedAttrs.update({'tagName':_get_tagName,
})
_writeComputedAttrs = FtNode._writeComputedAttrs.copy()
_writeComputedAttrs.update({
})
# Create the read-only list of attributes
_readOnlyAttrs = filter(lambda k,m=_writeComputedAttrs: not m.has_key(k),
FtNode._readOnlyAttrs + _readComputedAttrs.keys())
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