json-joy/esm/json-patch-ot/transforms/xRemove.js

Collection of libraries for building collaborative editing apps.

import { OpRemove } from '../../json-patch/op';
import { isRoot, isValidIndex, formatJsonPointer, isPathEqual } from '@jsonjoy.com/json-pointer';
import { lowerArrayPath } from './util';
import { operationToOp } from '../../json-patch/codec/json';
export const xRemove = (add, op) => {
    if (isRoot(add.path))
        return null;
    if (isRoot(op.path))
        return op;
    const lastIndex = add.path.length - 1;
    const lastStep = add.path[lastIndex];
    const isLastStepNumberLike = isValidIndex(lastStep);
    if (op instanceof OpRemove && isPathEqual(add.path, op.path) && isLastStepNumberLike)
        return null;
    if (isLastStepNumberLike) {
        const newPath = lowerArrayPath(add.path, op.path);
        const newFrom = op.from ? lowerArrayPath(add.path, op.from) : undefined;
        if (newPath || newFrom) {
            const operation = {
                ...op.toJson(),
                path: newPath ? formatJsonPointer(newPath) : op.path,
            };
            if (newFrom)
                operation.from = newFrom;
            return operationToOp(operation, {});
        }
    }
    return op;
};