Method backspace

packages/editor/src/context/selection.ts:326–371

()

  @action
  backspace() {
    if (this.isSingleNode()) {
      this.deleteSelectedNode()
      return
    }

    const deleteCursor = this.cursor
    // If there's a line cursor start, and the preceeding line is empty, delete that line (can be tree child)
    const lineStartCursors = this.cursorMap.getLineStartCursorsForCursorPosition(this.cursor)

    for (const startCursor of lineStartCursors) {
      if (!startCursor.listBlock.allowDelete()) {
        continue
      }
      const unindentTarget = startCursor.listBlock.getUnindentTarget(startCursor.index)
      if (unindentTarget) {
        startCursor.listBlock.childSet.removeChild(startCursor.index)
        const newlineNode = getBlankFillForCategory(unindentTarget.listBlock.childSet.nodeCategory)
        unindentTarget.listBlock.childSet.insertNode(newlineNode, unindentTarget.index)
        return
      }

      if (startCursor.index !== 0 && startCursor.listBlock.allowDelete()) {
        const prevLine = startCursor.listBlock.nodes[startCursor.index - 1]
        if (prevLine.node.isEmpty()) {
          startCursor.listBlock.childSet.removeChild(startCursor.index - 1)
          return
        }
      }
      if (
        startCursor.index < startCursor.listBlock.nodes.length &&
        startCursor.listBlock.nodes[startCursor.index].node.isEmpty() &&
        startCursor.listBlock.allowDelete()
      ) {
        const [leftCursor, isCursor] = this.cursorMap.getCursorLeftOfPosition(deleteCursor)
        startCursor.listBlock.childSet.removeChild(startCursor.index)
        this.placeCursorPosition(leftCursor, isCursor, true)
        return
      }
    }

    this.moveCursorLeft()
    if (this.isSingleNode()) {
      this.deleteSelectedNode()
    }
  }

  replaceOrWrapSelectedNode(node: SplootNode) {
    if (this.isSingleNode()) {