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basicelement.go
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basicelement.go
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package dom
type BasicElement struct {
basicNode
attributes basicNamedNodeMap
name Name
}
var _ Element = &BasicElement{}
// Returns a boolean value indicating whether or not the two nodes are
// the same (that is, they reference the same object).
func (el *BasicElement) IsSameNode(node Node) bool { return node == el }
func (el *BasicElement) IsEqualNode(node Node) bool {
el2, ok := node.(*BasicElement)
if !ok {
return false
}
if el.name != el2.name {
return false
}
if len(el.attributes.attrs) != len(el2.attributes.attrs) {
return false
}
for _, attr := range el.attributes.attrs {
attr2, ok := el2.attributes.mapAttrs[attr.name.Name]
if !ok {
return false
}
if !attr.IsEqualNode(attr2) {
return false
}
}
return isEqualNode(el, el2)
}
// Returns HTML uppercased qualified name
func (el *BasicElement) GetNodeName() string { return el.getQName() }
// Returns ELEMENT_NODE
func (el *BasicElement) GetNodeType() NodeType { return ELEMENT_NODE }
func (el *BasicElement) getQName() string {
return el.name.QName()
}
func (el *BasicElement) GetQName() Name {
return el.name
}
// Returns a String with the name of the tag for the given element.
func (el *BasicElement) GetTagName() string {
return el.name.QName()
}
// Returns a string representing the namespace prefix of the element,
// or "" if no prefix is specified.
func (el *BasicElement) GetPrefix() string {
return el.name.Prefix
}
// A string representing the local part of the qualified name of the
// element.
func (el *BasicElement) GetLocalName() string {
return el.name.Local
}
// Accepts a namespace URI as an argument and returns a boolean value
// with a value of true if the namespace is the default namespace on
// the given node or false if not.
func (el *BasicElement) IsDefaultNamespace(uri string) bool {
if len(uri) == 0 {
return false
}
return el.LookupNamespaceURI("") == uri
}
// // The namespace URI of the element, or "" if it is no namespace.}
// func (el *BasicElement) GetNamespaceURI() string {
// return el.space
// }
func (el *BasicElement) GetFirstElementChild() Element {
return nextElementSibling(el.GetFirstChild())
}
func (el *BasicElement) GetLastElementChild() Element {
return prevElementSibling(el.GetLastChild())
}
func (el *BasicElement) GetNextElementSibling() Element {
return nextElementSibling(el.GetNextSibling())
}
func (el *BasicElement) GetPreviousElementSibling() Element {
return prevElementSibling(el.GetPreviousSibling())
}
// Returns a string containing the prefix for a given namespace
// URI, if present, and "" if not. When multiple prefixes are
// possible, the result is implementation-dependent.
func (el *BasicElement) LookupPrefix(uri string) string {
if el.name.Space == uri && len(el.name.Prefix) > 0 {
return el.name.Prefix
}
for _, attr := range el.attributes.attrs {
if attr.name.Prefix == xmlnsPrefix && attr.value == uri {
return attr.name.Local
}
}
if el.parent == nil {
return ""
}
if _, ok := el.parent.(*BasicDocument); ok {
return ""
}
return el.parent.LookupPrefix(uri)
}
// Accepts a prefix and returns the namespace URI associated with it
// on the given node if found (and "" if not). Supplying "" for
// the prefix will return the default namespace.
func (el *BasicElement) LookupNamespaceURI(prefix string) string {
switch prefix {
case xmlPrefix:
return xmlURL
case xmlnsPrefix:
return xmlnsURL
}
if len(el.name.Space) > 0 && el.name.Prefix == prefix {
return el.name.Space
}
for _, attr := range el.attributes.attrs {
if attr.name.Space == xmlnsURL {
if attr.name.Prefix == xmlnsPrefix && attr.name.Local == prefix {
return attr.value
}
if len(prefix) == 0 && len(attr.name.Prefix) == 0 && attr.name.Local == xmlnsPrefix {
return attr.value
}
}
}
if el.parent == nil {
return ""
}
if _, ok := el.parent.(*BasicDocument); ok {
return ""
}
return el.parent.LookupNamespaceURI(prefix)
}
func nextElementSibling(start Node) Element {
if start == nil {
return nil
}
for trc := start; trc != nil; trc = trc.GetNextSibling() {
if el, ok := trc.(Element); ok {
return el
}
}
return nil
}
func prevElementSibling(start Node) Element {
if start == nil {
return nil
}
for trc := start; trc != nil; trc = trc.GetPreviousSibling() {
if el, ok := trc.(Element); ok {
return el
}
}
return nil
}
// Removes the element from the children list of its parent.
func (el *BasicElement) Remove() {
detachChild(el.GetParentNode(), el)
}
func (el *BasicElement) GetAttributes() NamedNodeMap {
return &BasicNamedNodeMap{
owner: el,
}
}
// // GetID() string
// Retrieves the value of the named attribute from the current node
// and returns it as a string.
func (el *BasicElement) GetAttribute(name string) (string, bool) {
attr := el.GetAttributeNode(name)
if attr == nil {
return "", false
}
return attr.GetValue(), true
}
// Returns an array of attribute names from the current element.
func (el *BasicElement) GetAttributeNames() []string {
ret := make([]string, el.attributes.GetLength())
for i := 0; i < len(ret); i++ {
ret[i] = el.attributes.attrs[i].name.QName()
}
return ret
}
// Retrieves the node representation of the named attribute from the
// current node and returns it as an Attr.
func (el *BasicElement) GetAttributeNode(name string) Attr {
return el.attributes.GetNamedItemNS("", name)
}
// Retrieves the node representation of the attribute with the
// specified name and namespace, from the current node and returns
// it as an Attr.
func (el *BasicElement) GetAttributeNodeNS(uri, name string) Attr {
return el.attributes.GetNamedItemNS(uri, name)
}
// Retrieves the value of the attribute with the specified
// namespace and name from the current node and returns it as a
// string.
func (el *BasicElement) GetAttributeNS(uri string, name string) (string, bool) {
attr := el.GetAttributeNodeNS(uri, name)
if attr == nil {
return "", false
}
return attr.GetValue(), true
}
// Returns a boolean value indicating if the element has the
// specified attribute or not.
func (el *BasicElement) HasAttribute(name string) bool {
return el.GetAttributeNode(name) != nil
}
// Returns a boolean value indicating if the element has the
// specified attribute, in the specified namespace, or not.
func (el *BasicElement) HasAttributeNS(uri string, name string) bool {
return el.GetAttributeNodeNS(uri, name) != nil
}
// Removes the named attribute from the current node.
func (el *BasicElement) RemoveAttribute(name string) {
el.attributes.RemoveNamedItemNS("", name)
}
// Removes the node representation of the named attribute from the
// current node.
func (el *BasicElement) RemoveAttributeNode(attr Attr) {
if attr.GetParentElement() == el {
el.attributes.removeAttr(attr)
}
}
// Removes the attribute with the specified name and namespace, from
// the current node.
func (el *BasicElement) RemoveAttributeNS(uri string, name string) {
el.attributes.RemoveNamedItemNS(uri, name)
}
// Sets the value of a named attribute of the current node.
func (el *BasicElement) SetAttribute(name string, value string) {
existing := el.attributes.GetNamedItemNS("", name)
if existing != nil {
existing.SetValue(value)
return
}
attr := el.ownerDocument.CreateAttribute(name)
attr.SetValue(value)
el.attributes.setNamedItemNS(el, attr)
}
// Sets the value of the attribute with the specified name and
// namespace, from the current node.
func (el *BasicElement) SetAttributeNS(prefix, uri, name string, value string) {
existing := el.attributes.GetNamedItemNS(uri, name)
if existing != nil {
existing.SetValue(value)
return
}
attr := el.ownerDocument.CreateAttributeNS(prefix, uri, name)
attr.SetValue(value)
el.attributes.setNamedItemNS(el, attr)
}
// Sets the node representation of the named attribute from the
// current node.
func (el *BasicElement) SetAttributeNode(attr Attr) {
el.attributes.setNamedItemNS(el, attr)
}
// Sets the node representation of the attribute with the specified
// name and namespace, from the current node.
func (el *BasicElement) SetAttributeNodeNS(attr Attr) {
el.attributes.setNamedItemNS(el, attr)
}
func (el *BasicElement) InsertBefore(newNode, referenceNode Node) Node {
if err := validatePreInsertion(newNode, el, referenceNode, "InsertBefore"); err != nil {
panic(err)
}
return insertBefore(el, newNode, referenceNode)
}
// Append newNode as a child of node
func (el *BasicElement) AppendChild(newNode Node) Node {
if err := validatePreInsertion(newNode, el, nil, "AppendChild"); err != nil {
panic(err)
}
return insertBefore(el, newNode, nil)
}
// Remove child from node
func (el *BasicElement) RemoveChild(child Node) {
if child.GetParentNode() != el {
panic(ErrDOM{
Typ: NOT_FOUND_ERR,
Msg: "Wrong parent",
Op: "RemoveChild",
})
}
detachChild(el, child)
}
func (el *BasicElement) Normalize() {
// Combine all text nodes
for childNode := el.GetFirstChild(); childNode != nil; {
childNode.Normalize()
text, ok := childNode.(*BasicText)
if !ok {
childNode = childNode.GetNextSibling()
continue
}
// This is a text node. Combine with the next text node
nextNode := text.GetNextSibling()
for {
if nextNode == nil {
childNode = nil
break
}
nextText, ok := nextNode.(*BasicText)
if !ok {
childNode = nextNode
break
}
text.text += nextText.text
nextNode = nextText.GetNextSibling()
detachChild(el, nextText)
}
}
}
func (el *BasicElement) CloneNode(deep bool) Node {
return el.cloneNode(el.ownerDocument, deep)
}
func (el *BasicElement) cloneNode(owner Document, deep bool) Node {
newElement := owner.CreateElement("").(*BasicElement)
newElement.name = el.name
for _, attr := range el.attributes.attrs {
newAttr := attr.cloneNode(owner, deep).(*BasicAttr)
newElement.attributes.setNamedItemNS(newElement, newAttr)
}
if deep {
for child := el.GetFirstChild(); child != nil; child = child.GetNextSibling() {
newEl := child.cloneNode(owner, deep)
newElement.AppendChild(newEl)
}
}
return newElement
}
func (el *BasicElement) getNamespaceInfo() (defaultNS string, definedPrefixes map[string]string) {
for _, attr := range el.attributes.attrs {
if len(attr.name.Space) == 0 && attr.name.Local == xmlnsPrefix {
defaultNS = attr.value
} else if attr.name.Space == xmlnsURL {
if definedPrefixes == nil {
definedPrefixes = make(map[string]string)
}
definedPrefixes[attr.name.Local] = attr.value
}
}
return
}