vzcode/dist/ot.js

Multiplayer code editor system

// Operational Transformation (OT) utilities.
// This file is the central point where the OT types are imported.
// Localized to one file so it's easy to change it in future.
import OTJSON1Presence from 'sharedb-client-browser/dist/ot-json1-presence-umd.cjs';
import jsondiff from 'json0-ot-diff';
import { diff_match_patch as DiffMatchPatch, DIFF_DELETE, DIFF_INSERT, DIFF_EQUAL, } from '@dmsnell/diff-match-patch';
// Attach the constants to the class as static properties for compatibility with json0-ot-diff
DiffMatchPatch.DIFF_DELETE = DIFF_DELETE;
DiffMatchPatch.DIFF_INSERT = DIFF_INSERT;
DiffMatchPatch.DIFF_EQUAL = DIFF_EQUAL;
const diffMatchPatch = DiffMatchPatch;
export const { json1Presence, textUnicode } = OTJSON1Presence;
// The OT type used throughout the codebase.
export const otType = json1Presence.type;
// Applies an OT op to an object.
export const apply = otType.apply;
export const diff = (a, b) => jsondiff(a, b, diffMatchPatch, json1Presence, textUnicode);