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changes.js
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changes.js
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import { Selector } from "turbo_diff/selector"
import { DeleteChange } from "turbo_diff/delete_change"
import { InsertChange } from "turbo_diff/insert_change"
import { ReplaceChange } from "turbo_diff/replace_change"
import { AttributesChange } from "turbo_diff/attributes_change"
import { filterElementAndTextNodes } from "turbo_diff/helpers"
export class Changes {
constructor(fromNode, changes) {
this.fromNode = fromNode
this.changes = changes
this.nodesBySelector = this.groupNodesBySelector(fromNode)
}
apply() {
this.changes.forEach(change => {
this.applyChange(change)
})
return this.fromNode
}
// Private
groupNodesBySelector(rootNode) {
const nodesBySelector = {};
function group(node, selector) {
nodesBySelector[selector] = node
const children = filterElementAndTextNodes(node.childNodes);
for (let i = 0; i < children.length; i++) {
const child = children[i]
const childSelector = `${selector}/${i}`
// if(child.setAttribute)
// child.setAttribute("data-debug-turbo-diff-selector", childSelector)
group(child, childSelector)
}
}
group(rootNode, "0")
return nodesBySelector
}
applyChange(change) {
const selector = new Selector(change.selector)
const targetNode = this.getNodeBySelector(selector.toString())
const parentNode = this.getNodeBySelector(selector.parent.toString())
this.buildChange(change, targetNode, parentNode).apply()
}
buildChange(change, targetNode, parentNode) {
switch (change.type) {
case "replace":
return new ReplaceChange(targetNode, change)
case "insert":
return new InsertChange(parentNode, change)
case "delete":
return new DeleteChange(targetNode, change)
case "attributes":
return new AttributesChange(targetNode, change)
}
throw `Unknown change type: ${change.type}`
}
getNodeBySelector(selector) {
return this.nodesBySelector[selector]
}
}