Function restore

codejar.ts:221–285

(pos: Position)

  }

  function restore(pos: Position) {
    const s = getSelection()
    let startNode: Node | undefined, startOffset = 0
    let endNode: Node | undefined, endOffset = 0

    if (!pos.dir) pos.dir = '->'
    if (pos.start < 0) pos.start = 0
    if (pos.end < 0) pos.end = 0

    // Flip start and end if the direction reversed
    if (pos.dir == '<-') {
      const {start, end} = pos
      pos.start = end
      pos.end = start
    }

    let current = 0

    visit(editor, el => {
      if (el.nodeType !== Node.TEXT_NODE) return

      const len = (el.nodeValue || '').length
      if (current + len > pos.start) {
        if (!startNode) {
          startNode = el
          startOffset = pos.start - current
        }
        if (current + len > pos.end) {
          endNode = el
          endOffset = pos.end - current
          return 'stop'
        }
      }
      current += len
    })

    if (!startNode) startNode = editor, startOffset = editor.childNodes.length
    if (!endNode) endNode = editor, endOffset = editor.childNodes.length

    // Flip back the selection
    if (pos.dir == '<-') {
      [startNode, startOffset, endNode, endOffset] = [endNode, endOffset, startNode, startOffset]
    }

    {
      // If nodes not editable, create a text node.
      const startEl = uneditable(startNode)
      if (startEl) {
        const node = document.createTextNode('')
        startEl.parentNode?.insertBefore(node, startEl)
        startNode = node
        startOffset = 0
      }
      const endEl = uneditable(endNode)
      if (endEl) {
        const node = document.createTextNode('')
        endEl.parentNode?.insertBefore(node, endEl)
        endNode = node