json8-patch/lib/unpack.js

JSON Patch toolkit for JavaScript

"use strict";

const ops = Object.create(null);
ops[0] = "add";
ops[1] = "remove";
ops[2] = "replace";
ops[3] = "move";
ops[4] = "copy";
ops[5] = "test";

module.exports = function unpack(packed) {
  const unpacked = [];

  for (let i = 0, l = packed.length; i < l; i++) {
    const p = packed[i];
    const ap = p[0];
    const a = ops[ap];
    const op = { op: a, path: p[1] };

    // add, replace, test
    if (ap === 0 || ap === 2 || ap === 5) op.value = p[2];
    // move, copy
    else if (ap !== 1) op.from = p[2];

    unpacked.push(op);
  }

  return unpacked;
};