slate#RemoveNodeOperation TypeScript Examples

The following examples show how to use slate#RemoveNodeOperation. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: transMoveNode.ts    From slate-ot with MIT License 6 votes vote down vote up 
decomposeMove = (
  op: MoveNodeOperation
): [RemoveNodeOperation, InsertNodeOperation] => {
  const rem: RemoveNodeOperation = {
    type: 'remove_node',
    path: op.path.slice(),
    node: { text: '' },
  };

  const ins: InsertNodeOperation = {
    type: 'insert_node',
    path: Path.transform(op.path, op)!,
    node: { text: '' },
  };

  return [rem, ins];
}
Example #2
Source File: transMoveNode.ts    From slate-ot with MIT License 6 votes vote down vote up 
composeMove = (
  rem: RemoveNodeOperation,
  ins: InsertNodeOperation
): MoveNodeOperation => {
  let path = rem.path;
  let newPath = Path.transform(ins.path, {
    ...rem,
    type: 'insert_node',
  })!;

  // this is a trick in slate:
  //   normally moving destination is right BEFORE newPath,
  //   however when the condition holds, it becomes right AFTER newPath
  if (Path.isSibling(path, newPath) && Path.endsBefore(path, newPath)) {
    newPath = Path.previous(newPath);
  }

  return {
    type: 'move_node',
    path,
    newPath,
  };
}
Example #3
Source File: transMoveNode.ts    From slate-ot with MIT License 6 votes vote down vote up 
reverseMove = (
  rem: RemoveNodeOperation,
  ins: InsertNodeOperation
): MoveNodeOperation => {
  let path = ins.path;
  let newPath = Path.transform(rem.path, ins)!;

  if (Path.isSibling(path, newPath) && Path.endsBefore(path, newPath)) {
    newPath = Path.previous(newPath);
  }

  return {
    type: 'move_node',
    path,
    newPath,
  };
}
Example #4
Source File: utils.ts    From slate-ot with MIT License 6 votes vote down vote up 
makeOp = {
  insertText: (
    path: Path,
    offset: number,
    text: string
  ): InsertTextOperation => {
    return {
      type: 'insert_text',
      path,
      offset,
      text,
    };
  },

  removeText: (
    path: Path,
    offset: number,
    text: string
  ): RemoveTextOperation => {
    return {
      type: 'remove_text',
      path,
      offset,
      text,
    };
  },

  insertNode: (path: Path, node: Node): InsertNodeOperation => {
    return {
      type: 'insert_node',
      path,
      node,
    };
  },

  removeNode: (path: Path, node: Node): RemoveNodeOperation => {
    return {
      type: 'remove_node',
      path,
      node,
    };
  },

  splitNode: (path: Path, position: number): SplitNodeOperation => {
    return {
      type: 'split_node',
      path,
      position,
      target: null,
      properties: {},
    };
  },

  mergeNode: (path: Path, position: number): MergeNodeOperation => {
    return {
      type: 'merge_node',
      path,
      position,
      target: null,
      properties: {},
    };
  },

  moveNode: (path: Path, newPath: Path): MoveNodeOperation => {
    return {
      type: 'move_node',
      path,
      newPath,
    };
  },

  setNode: (path: Path, newProperties: Partial<Node>): SetNodeOperation => {
    return {
      type: 'set_node',
      path,
      properties: {},
      newProperties,
    };
  },
}
Example #5
Source File: transMergeNode.ts    From slate-ot with MIT License 4 votes vote down vote up 
transMergeNode = (
  leftOp: MergeNodeOperation,
  rightOp: Operation,
  _side: 'left' | 'right'
): (MergeNodeOperation | MoveNodeOperation | RemoveNodeOperation)[] => {
  switch (rightOp.type) {
    case 'insert_text': {
      if (Path.equals(leftOp.path, Path.next(rightOp.path))) {
        return [
          {
            ...leftOp,
            position: leftOp.position + rightOp.text.length,
          },
        ];
      }

      return [leftOp];
    }

    case 'remove_text': {
      if (Path.equals(leftOp.path, Path.next(rightOp.path))) {
        return [
          {
            ...leftOp,
            position: leftOp.position - rightOp.text.length,
          },
        ];
      }

      return [leftOp];
    }

    case 'insert_node': {
      if (Path.equals(leftOp.path, rightOp.path)) {
        const offset = Text.isText(rightOp.node)
          ? rightOp.node.text.length
          : rightOp.node.children.length;

        return [
          leftOp, // merge the inserted node
          {
            ...leftOp, // merge the original node
            position: leftOp.position + offset,
          },
        ];
      }

      if (Path.isParent(Path.previous(leftOp.path), rightOp.path)) {
        return [
          {
            ...leftOp,
            position: leftOp.position + 1,
          },
        ];
      }

      return <MergeNodeOperation[]>pathTransform(leftOp, rightOp);
    }

    case 'remove_node': {
      if (Path.isParent(Path.previous(leftOp.path), rightOp.path)) {
        return [
          {
            ...leftOp,
            position: leftOp.position - 1,
          },
        ];
      }

      const path = Path.transform(leftOp.path, rightOp);
      const prevPath = Path.transform(Path.previous(leftOp.path), rightOp);

      if (path && prevPath) {
        return [
          {
            ...leftOp,
            path,
          },
        ];
      }

      // conflicting ops, we have to discard merge
      // for now we simply remove the merged node
      else if (!path && prevPath) {
        return [
          {
            ...rightOp,
            path: prevPath,
          },
        ];
      } else if (path && !prevPath) {
        return [
          {
            ...rightOp,
            path,
          },
        ];
      }

      // both to-merge nodes are removed
      else {
        return [];
      }
    }

    case 'split_node': {
      if (Path.equals(leftOp.path, rightOp.path)) {
        return [
          leftOp,
          {
            ...leftOp,
            position: leftOp.position + rightOp.position,
          },
        ];
      }

      if (Path.equals(Path.previous(leftOp.path), rightOp.path)) {
        return [
          {
            ...leftOp,
            path: Path.next(leftOp.path),
            position: leftOp.position - rightOp.position,
          },
        ];
      }

      if (Path.isParent(Path.previous(leftOp.path), rightOp.path)) {
        return [
          {
            ...leftOp,
            position: leftOp.position + 1,
          },
        ];
      }

      const path = Path.transform(leftOp.path, rightOp)!;

      // conflicting ops, we choose to discard split
      if (path[path.length - 1] === 0) {
        return [
          {
            ...rightOp,
            type: 'merge_node',
            path: Path.next(rightOp.path),
          },
          leftOp,
        ];
      }

      return <MergeNodeOperation[]>pathTransform(leftOp, rightOp);
    }

    case 'merge_node': {
      if (Path.equals(leftOp.path, rightOp.path)) {
        return [];
      }

      if (Path.equals(Path.previous(leftOp.path), rightOp.path)) {
        return [
          {
            ...leftOp,
            path: Path.previous(leftOp.path),
            position: leftOp.position + rightOp.position,
          },
        ];
      }

      if (Path.isParent(Path.previous(leftOp.path), rightOp.path)) {
        return [
          {
            ...leftOp,
            position: leftOp.position - 1,
          },
        ];
      }

      return <MergeNodeOperation[]>pathTransform(leftOp, rightOp);
    }

    case 'move_node': {
      if (Path.equals(rightOp.path, rightOp.newPath)) {
        return [leftOp];
      }

      const path = leftOp.path;
      const prevPath = Path.previous(path);

      const newPath = Path.transform(path, rightOp)!;
      const newPrevPath = Path.transform(prevPath, rightOp)!;

      // Ops conflict with each other, discard merge.
      //   Note that the merge-and-split node cannot keep properties,
      //   so we have to remove it.
      if (!Path.equals(newPath, Path.next(newPrevPath))) {
        return [
          {
            type: 'remove_node',
            path: newPath,
            node: { text: '' },
          },
        ];
      }

      let position = leftOp.position;

      // only src path is leftOp's child
      if (Path.isParent(prevPath, rightOp.path)) {
        position--;
      }

      // only dst path is leftOp's child
      if (Path.isParent(prevPath, rightOp.newPath)) {
        position++;
      }

      return [
        {
          ...leftOp,
          path: newPath,
          position,
        },
      ];
    }

    // set_node
    default:
      return <MergeNodeOperation[]>pathTransform(leftOp, rightOp);
  }
}
Example #6
Source File: transMoveNode.ts    From slate-ot with MIT License 4 votes vote down vote up 
transMoveNode = (
  leftOp: MoveNodeOperation,
  rightOp: Operation,
  side: 'left' | 'right'
): (MoveNodeOperation | RemoveNodeOperation | SplitNodeOperation)[] => {
  if (Path.equals(leftOp.path, leftOp.newPath)) {
    return [];
  }

  let [lr, li] = decomposeMove(leftOp);

  switch (rightOp.type) {
    case 'insert_node': {
      let [l] = xTransformMxN([lr, li], [rightOp], side);

      return [
        composeMove(<RemoveNodeOperation>l[0], <InsertNodeOperation>l[1]),
      ];
    }

    case 'remove_node': {
      let [l] = xTransformMxN([lr, li], [rightOp], side);

      // normal case
      if (l.length === 2) {
        return [
          {
            ...leftOp,
            ...composeMove(
              <RemoveNodeOperation>l[0],
              <InsertNodeOperation>l[1]
            ),
          },
        ];
      }

      // leftOp moves a branch into the removed zone
      else if (l.length === 1 && l[0].type === 'remove_node') {
        return [l[0]];
      }

      // leftOp moves a branch out of the removed zone
      // we choose NOT to keep it
      else if (l.length === 1 && l[0].type === 'insert_node') {
        return [];
      }

      // l.length === 0, move within the removed zone
      else {
        return [];
      }
    }

    case 'split_node': {
      const after: boolean =
        Path.isSibling(leftOp.path, leftOp.newPath) &&
        Path.endsBefore(leftOp.path, leftOp.newPath);

      // the split nodes have to move separately
      if (Path.equals(leftOp.path, rightOp.path)) {
        const newPath = Path.transform(leftOp.newPath, rightOp)!;
        // the split nodes are moved AFTER newPath
        if (after) {
          return [
            {
              ...leftOp, // move first node
              newPath,
            },
            {
              ...leftOp, // move second node
              newPath,
            },
          ];
        }

        // the split nodes are moved BEFORE newPath
        else {
          const firstMove: MoveNodeOperation = {
            ...leftOp, // move second node
            path: Path.next(leftOp.path),
            newPath,
          };

          const secondMove: MoveNodeOperation = {
            ...leftOp, // move first node
            path: Path.transform(leftOp.path, firstMove)!,
            newPath: Path.previous(Path.transform(newPath, firstMove)!),
          };

          return [firstMove, secondMove];
        }
      }

      let newPath = Path.transform(leftOp.newPath, rightOp)!;

      // the newPath is between the split nodes
      // note that it is impossible for newPath == rightOp.path
      if (Path.equals(newPath, Path.next(rightOp.path)) && !after) {
        newPath = rightOp.path;
      }

      // a tricky case:
      //   when after is true, and the splitOp separated path and newPath
      //   to no-longer be siblings, the after becomes false
      //   in this case we should move one step after
      else if (after && !Path.isSibling(leftOp.path, newPath)) {
        newPath = Path.next(newPath);
      }

      // finally, the normal case
      return [
        {
          ...leftOp,
          path: Path.transform(leftOp.path, rightOp)!,
          newPath,
        },
      ];
    }

    case 'merge_node': {
      let path = rightOp.path;
      let prevPath = Path.previous(path);

      path = Path.transform(path, leftOp)!;
      prevPath = Path.transform(prevPath, leftOp)!;

      // ops conflict with each other, discard merge
      // Note that the merge-and-split node cannot keep properties,
      //   so we have to remove it.
      if (!Path.equals(path, Path.next(prevPath))) {
        return [
          {
            ...rightOp,
            type: 'split_node',
            path: Path.previous(rightOp.path),
          },
          leftOp,
          {
            type: 'remove_node',
            path,
            node: { text: '' },
          },
        ];
      }

      // a tricky case:
      //   if leftOp.path is a child of rightOp.prevPath,
      //   and leftOp.newPath is a child of rightOp.path.
      //   intentionally, leftOp wants to insert BEFORE leftOp.newPath;
      //   but after merging, leftOp's path and newPath become siblings.
      //   the move dst turns out to be AFTER the transformed newPath.
      //   therefore we should move one step ahead
      if (
        Path.isParent(Path.previous(rightOp.path), leftOp.path) &&
        Path.isParent(rightOp.path, leftOp.newPath)
      ) {
        return [
          {
            ...leftOp,
            path: Path.transform(leftOp.path, rightOp)!,
            newPath: Path.previous(Path.transform(leftOp.newPath, rightOp)!),
          },
        ];
      }

      return [
        {
          ...leftOp,
          path: Path.transform(leftOp.path, rightOp)!,
          newPath: Path.transform(leftOp.newPath, rightOp)!,
        },
      ];
    }

    case 'move_node': {
      // the other side didn't do anything
      if (Path.equals(rightOp.path, rightOp.newPath)) {
        return [leftOp];
      }

      let [rr, ri] = decomposeMove(rightOp);

      let [l, r] = xTransformMxN([lr, li], [rr, ri], side);

      // normal case
      if (l.length === 2) {
        return [
          composeMove(<RemoveNodeOperation>l[0], <InsertNodeOperation>l[1]),
        ];
      }

      // handling conflict
      if (r.length === 1) {
        // must have l.length === 1 && l[0].type === r[0].type)
        return side === 'left' ? [reverseMove(rr, ri), leftOp] : [];
      }

      // for the rest we have r.length === 2
      if (l.length === 0) {
        l[0] = {
          type: 'remove_node',
          path: ri.path.concat(lr.path.slice(rr.path.length)),
          node: { text: '' },
        };
        l[1] = {
          type: 'insert_node',
          path: ri.path.concat(li.path.slice(rr.path.length)),
          node: { text: '' },
        };
      }

      // for the rest we have l.length === 1
      else if (l[0].type === 'remove_node') {
        l[1] = {
          type: 'insert_node',
          path: (<InsertNodeOperation>r[1]).path.concat(
            li.path.slice((<RemoveNodeOperation>r[0]).path.length)
          ),
          node: { text: '' },
        };
      }

      // for the rest we have l[0].type === 'insert_node'
      else {
        l[1] = l[0];
        l[0] = {
          type: 'remove_node',
          path: ri.path.concat(lr.path.slice(rr.path.length)),
          node: { text: '' },
        };
      }

      return [
        composeMove(<RemoveNodeOperation>l[0], <InsertNodeOperation>l[1]),
      ];
    }

    // insert_text
    // remove_text
    // set_node
    default:
      return [leftOp];
  }
}
Example #7
Source File: transRemoveNode.ts    From slate-ot with MIT License 4 votes vote down vote up 
transRemoveNode = (
  leftOp: RemoveNodeOperation,
  rightOp: Operation,
  side: 'left' | 'right'
): (RemoveNodeOperation | SplitNodeOperation)[] => {
  switch (rightOp.type) {
    case 'split_node': {
      if (Path.equals(leftOp.path, rightOp.path)) {
        // should remove the target node && the split node
        //   however, after removing the target node,
        //   the split node becomes the same path.
        // TODO: node within op should be split.
        return [leftOp, leftOp];
      }

      return <RemoveNodeOperation[]>pathTransform(leftOp, rightOp);
    }

    case 'merge_node': {
      // One of the to-merge nodes are removed, we have to discard merging.
      // It might be better to keep the unremoved node,
      //   but it is tricky to keep properties by merge-and-split,
      //   therefore we choose to remove the entired merged node
      if (
        Path.equals(leftOp.path, Path.previous(rightOp.path)) ||
        Path.equals(leftOp.path, rightOp.path)
      ) {
        return [
          {
            ...leftOp,
            path: Path.previous(rightOp.path),
          },
        ];
      }

      return <RemoveNodeOperation[]>pathTransform(leftOp, rightOp);
    }

    case 'move_node': {
      if (Path.equals(rightOp.path, rightOp.newPath)) {
        return [leftOp];
      }

      let [rr, ri] = decomposeMove(rightOp);
      let [l, r] = xTransformMxN([leftOp], [rr, ri], side);

      // leftOp removes a node within the moved zone
      // ri must have survived and not been changed
      // we use ri's path to compute the true path to remove
      if (l.length === 0) {
        return [
          {
            ...leftOp,
            path: ri.path.concat(leftOp.path.slice(rr.path.length)),
          },
        ];
      }

      // now we have l.length === 1
      // in most cases we can return, but to be consist with move-remove
      // we need to handle the case that rightOp moved a branch out
      if (r.length === 1 && r[0].type === 'insert_node') {
        l = [
          ...l,
          {
            type: 'remove_node',
            path: r[0].path,
            node: { text: '' },
          },
        ];
      }

      return <RemoveNodeOperation[]>l;
    }

    // insert_text
    // remove_text
    // insert_node
    // remove_node
    // set_node
    default:
      return <RemoveNodeOperation[]>pathTransform(leftOp, rightOp);
  }
}