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

ShowDiff plugin for @atlaskit/editor-core

/**
 * Groups adjacent changes to reduce visual fragmentation in diffs.
 * Merges consecutive insertions and deletions that are close together.
 */
export function optimizeChanges(changes) {
  if (changes.length <= 1) {
    return changes;
  }
  const optimized = [];
  let current = {
    ...changes[0]
  };
  for (let i = 1; i < changes.length; i++) {
    const next = changes[i];

    // Check if changes are adjacent or very close (within 2 positions)
    const isAdjacent = next.fromB <= current.toB + 2;
    if (isAdjacent) {
      current = {
        fromA: current.fromA,
        toA: Math.max(current.toA, next.toA),
        fromB: current.fromB,
        toB: Math.max(current.toB, next.toB),
        deleted: [...current.deleted, ...next.deleted],
        inserted: [...current.inserted, ...next.inserted]
      };
    } else {
      optimized.push(current);
      current = {
        ...next
      };
    }
  }
  optimized.push(current);
  return optimized;
}