dhtml/src/client/span.ts at main · tombl/dhtml

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import { assert } from '../shared.ts'

export interface Span {

readonly _start: Node

readonly _end: Node

}

export function create_span_into(parent: Node): Span {

return { _start: parent.appendChild(new Text()), _end: parent.appendChild(new Text()) }

}

export function create_span_after(node: Node): Span {

assert(node.parentNode !== null)

return {

_start: node.parentNode.insertBefore(new Text(), node.nextSibling),

_end: node.parentNode.insertBefore(new Text(), node.nextSibling!.nextSibling),

}

export function insert_node(span: Span, node: Node): void {

span._end.parentNode!.insertBefore(node, span._end)

}

export function extract_contents(span: Span): DocumentFragment {

const fragment = document.createDocumentFragment()

let node = span._start.nextSibling

for (;;) {

assert(node)

if (node === span._end) break

const next = node.nextSibling

fragment.appendChild(node)

node = next

}

return fragment

}

export function delete_contents(span: Span): void {