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########################################################################
#
# File Name: Element.py
#
# Documentation: http://docs.4suite.com/4DOM/Element.py.html
#
"""
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
import Event
from xml.dom import Node
from xml.dom import XML_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 ext import SplitQName, IsDOMString
import re, string
#FIXME: should allow combining characters: fix when Python gets Unicode
g_namePattern = re.compile('[a-zA-Z_:][\w\.\-_:]*\Z')
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
if node.namespaceURI is None:
self.attributes.removeNamedItem(node.name)
else:
self.attributes.removeNamedItemNS(node.namespaceURI, node.localName)
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 g_namePattern.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 != None:
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):
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) != 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 g_namePattern.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 != None:
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(self)
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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