wasm tools

This commit is contained in:
gutmet 2023-03-04 18:24:14 +01:00
parent c19893df11
commit ed46142b44

104
wasm/wasm.go Normal file
View File

@ -0,0 +1,104 @@
package wasm
import (
"strconv"
"syscall/js"
)
type Node struct {
tag string
id string
attrs []*Attribute
children []*Node
jsElement js.Value
innerText string
}
type Attribute struct {
Name string
Value string
}
func document(document js.Value) *Node {
return &Node{jsElement: document}
}
func (n *Node) createElement(document js.Value) {
var el = document.Call("createElement", n.tag)
el.Call("setAttribute", "id", n.id)
for _, attr := range n.attrs {
el.Call("setAttribute", attr.Name, attr.Value)
}
n.jsElement = el
}
func (n *Node) AppendChild(child *Node) {
if child.tag != "" {
n.children = append(n.children, child)
n.jsElement.Call("appendChild", child.jsElement)
} else {
n.jsElement.Set("innerText", child.innerText)
}
}
func (n *Node) GetChildren() []*Node {
return n.children
}
func (n *Node) ReplaceChildren(newChildren []*Node) {
n.children = newChildren
for {
child := n.jsElement.Get("firstChild")
if child.IsNull() {
break
}
n.jsElement.Call("removeChild", child)
}
for _, child := range n.children {
n.AppendChild(child)
}
}
type NodeFactory struct {
document *Node
idCounter int64
root *Node
}
func NewNodeFactory(jsDocument js.Value) *NodeFactory {
var f = &NodeFactory{document: document(jsDocument), idCounter: 0}
f.setRoot()
return f
}
func (f *NodeFactory) setRoot() {
var rootElement = f.document.jsElement.Get("firstElementChild")
if rootElement.IsNull() {
f.root = f.NewNode("html")
} else {
f.root = &Node{tag: "html", jsElement: rootElement}
f.document.AppendChild(f.root)
}
}
func (f *NodeFactory) Root() *Node {
return f.root
}
func (f *NodeFactory) NewBody() *Node {
var body = f.NewNode("body")
f.root.AppendChild(body)
return body
}
func (f *NodeFactory) NewNode(tag string, attributes ...*Attribute) *Node {
var id = f.idCounter
f.idCounter++
var n = &Node{tag: tag, id: strconv.FormatInt(id, 10), attrs: attributes}
n.createElement(f.document.jsElement)
return n
}
func (f *NodeFactory) NewTextNode(text string) *Node {
return &Node{innerText: text}
}