@atlaskit/editor-plugin-show-diff/dist/es2019/pm-plugins/calculateDiff/markAwareTokenEncoder.js

ShowDiff plugin for @atlaskit/editor-core

import { encodeCharacterWithMarks } from './encodeCharacterWithMarks';

/** Mirrors the library's private (unexported) `typeID` so node-end tokens match. */
const typeID = type => {
  const cache = type.schema.cached.changeSetIDs || (type.schema.cached.changeSetIDs = Object.create(null));
  let id = cache[type.name];
  if (id == null) {
    cache[type.name] = id = Object.keys(type.schema.nodes).indexOf(type.name) + 1;
  }
  return id;
};

/**
 * The library default encoder plus mark folding on text characters.
 *
 * Deliberately narrower than `attrAwareTokenEncoder`: node-start tokens keep the library default
 * and do not fold in diffable attributes, which `getAttrChangeRanges` already reports for every
 * diff type. The NCS version-history path also uses `attrAwareTokenEncoder` so main diff calculation
 * detects attribute-only node replacements.
 */
export const markAwareTokenEncoder = {
  encodeCharacter: (char, marks) => encodeCharacterWithMarks(char, marks),
  encodeNodeStart: node => node.type.name,
  encodeNodeEnd: node => -typeID(node.type),
  compareTokens: (a, b) => a === b
};