// CreateFragment returns a DocumentFragment with the given html dom
func CreateFragment(html string) *js.Object {
//if we are not in a browser,panic
panicBrowserDetect()
//we need to use innerhtml but DocumentFragments dont have that so we use
//a discardable div
// div := doc.CreateElement("div")
div := jsutils.CreateElement("div")
//build up the html right in the div
jsutils.SetInnerHTML(div, html)
//unwrap all the special Text UnknownELement we are using
// jsutils.UnWrapSpecialTextElements(div)
//create the document fragment
fragment := jsutils.CreateDocumentFragment()
//add the nodes from the div into the fragment
nodes := jsutils.ChildNodeList(div)
jsutils.AppendChild(fragment, nodes...)
//unwrap all the special Text UnknownELement we are using
// jsutils.UnWrapSpecialTextElements(fragment)
return fragment
}
// Patch takes a dom string and creates a documentfragment from it and patches a existing dom element that is supplied. This algorithim only ever goes one-level deep, its not performant
// WARNING: this method is specifically geared to dealing with the haiku.Tree dom generation
func Patch(fragment, live *js.Object, onlyReplace bool) {
if !live.Call("hasChildNodes").Bool() {
// if the live element is actually empty, then just append the fragment which
// actually appends the nodes within it efficiently
jsutils.AppendChild(live, fragment)
return
}
// log.Printf("doing patching")
// shadowNodes := fragment.ChildNodes()
shadowNodes := jsutils.ChildNodeList(fragment)
liveNodes := jsutils.ChildNodeList(live)
// FIXED: instead of going through the children which may be many,
// liveNodes := fragment.ChildNodes()
// log.Printf("patchtree will now add: \n%+s", shadowNodes)
patchloop:
for n, node := range shadowNodes {
if node == nil || node == js.Undefined {
continue
}
// switch node.Get("constructor") {
// case js.Global.Get("Node"):
// elem := node
if node.Get("constructor") == js.Global.Get("Text") {
// log.Printf("text %+s %s %s %d", node, node.Get("nodeName"), node.Get("innerText"), node.Get("nodeType").Int())
if _, empty := jsutils.EmptyTextNode(node); empty {
jsutils.AppendChild(live, node)
continue patchloop
}
var liveNodeAt *js.Object
if n < len(liveNodes) {
liveNodeAt = liveNodes[n]
}
if liveNodeAt == nil || liveNodeAt == js.Undefined {
jsutils.AppendChild(live, node)
} else {
jsutils.InsertBefore(live, liveNodeAt, node)
}
continue patchloop
}
//get the tagname
tagname := jsutils.GetTag(node)
// log.Printf("Working with tag %s -> %+s", tagname, nchildren)
// get the basic attrs
var id, hash, class, uid string
// do we have 'id' attribute? if so its a awesome chance to simplify
if jsutils.HasAttribute(node, "id") {
id = jsutils.GetAttribute(node, "id")
}
if jsutils.HasAttribute(node, "class") {
id = jsutils.GetAttribute(node, "class")
}
// lets check for the hash and uid, incase its a pure template based script
if jsutils.HasAttribute(node, "hash") {
hash = jsutils.GetAttribute(node, "hash")
}
if jsutils.HasAttribute(node, "uid") {
uid = jsutils.GetAttribute(node, "uid")
}
// if tagname == "tmlview" {
// frstchild := node.()
// frstchild.
// }
// if we have no id,class, uid or hash, we digress to bad approach of using Node.IsEqualNode
if allEmpty(id, hash, uid) {
// log.Printf("adding since hash,id,uid are empty")
AddNodeIfNone(live, node)
continue patchloop
}
// eliminate which ones are empty and try to use the non empty to get our target
if allEmpty(hash, uid) {
// is the id empty also then we know class is not or vise-versa
if allEmpty(id) {
// log.Printf("adding since class")
// class is it and we only want those that match narrowing our set
no := jsutils.QuerySelectorAll(live, class)
// if none found we add else we replace
if len(no) <= 0 {
jsutils.AppendChild(live, node)
} else {
// check the available sets and replace else just add it
AddNodeIfNoneInList(live, no, node)
}
} else {
// id is it and we only want one
// log.Printf("adding since id")
no := jsutils.QuerySelector(live, fmt.Sprintf("#%s", id))
// if none found we add else we replace
if no == nil || no != js.Undefined {
jsutils.AppendChild(live, node)
} else {
jsutils.ReplaceNode(live, node, no)
}
}
continue patchloop
}
// lets use our unique id to check for the element if it exists
sel := fmt.Sprintf(`%s[uid='%s']`, strings.ToLower(tagname), uid)
// we know hash and uid are not empty so we kick ass the easy way
target := jsutils.QuerySelector(live, sel)
// log.Printf("textElem %s -> %s -> %s : target -> %+s", node, node.Get("tagName"), sel, target)
// if we are nil then its a new node add it and return
if target == nil || target == js.Undefined {
jsutils.AppendChild(live, node)
continue patchloop
}
if onlyReplace {
jsutils.ReplaceNode(live, node, target)
continue patchloop
}
//if we are to be removed then remove the target
if jsutils.HasAttribute(node, "haikuRemoved") {
// log.Printf("removed node: %+s", node)
// target.ParentNode().RemoveChild(target)
jsutils.RemoveChild(target, target)
continue patchloop
}
// if the target hash is exactly the same with ours skip it
if jsutils.GetAttribute(target, "hash") == hash {
continue patchloop
}
nchildren := jsutils.ChildNodeList(node)
// log.Printf("Checking size of children %s %d", sel, len(nchildren))
//if the new node has no children, then just replace it
// if len(elem.ChildNodes()) <= 0 {
if len(nchildren) <= 0 {
// live.ReplaceChild(node, target)
jsutils.ReplaceNode(live, node, target)
continue patchloop
}
//here we are not be removed and we do have kids
//cleanout all the targets text-nodes
jsutils.CleanAllTextNode(target)
//so we got this dude, are we already one level deep ? if so swap else
// run through the children with Patch
// if level >= 1 {
// live.ReplaceChild(node, target)
attrs := jsutils.Attributes(node)
for key, value := range attrs {
jsutils.SetAttribute(target, key, value)
}
children := jsutils.ChildNodeList(target)
// log.Printf("checking targets children %+s %d", target, len(children))
if len(children) <= 1 {
jsutils.SetInnerHTML(target, "")
jsutils.AppendChild(target, nchildren...)
// for _, enode := range nchildren {
// target.AppendChild(enode)
// }
continue patchloop
}
Patch(node, target, onlyReplace)
// }
// default:
// // add it if its not an element
// jsutils.AppendChild(live, node)
// live.AppendChild(node)
// }
}
}