datum-merge
Version:
Simplified diff and merging for deeply nested objects
80 lines (79 loc) • 2.98 kB
JavaScript
import { get, set, toPath, unset } from "lodash-es";
import { deepDiffLow } from "./diff-high";
export function diffToPatchLog(differences, storePrev = false) {
var _a, _b, _c;
const jsonPatch = [];
for (const dif of differences) {
let pointer = asJsonPointer((_a = dif.path) !== null && _a !== void 0 ? _a : []);
switch (dif.kind) {
case "N":
jsonPatch.push({ op: "add", path: pointer, value: dif.rhs });
break;
case "E":
jsonPatch.push({ op: "replace", path: pointer, value: dif.rhs, prev: dif.lhs });
break;
case "D":
jsonPatch.push({ op: "remove", path: pointer, prev: dif.lhs });
break;
case "A":
pointer = `${pointer}/${dif.index}`;
if (((_b = dif.item) === null || _b === void 0 ? void 0 : _b.kind) === 'N') {
jsonPatch.push({ op: "add", path: pointer, value: dif.item.rhs });
}
if (((_c = dif.item) === null || _c === void 0 ? void 0 : _c.kind) === 'D') {
jsonPatch.push({ op: "remove", path: pointer, prev: dif.item.lhs });
}
break;
}
}
if (!storePrev) {
jsonPatch.forEach((p) => delete p.prev);
}
return jsonPatch;
}
export function applyPatchLog(patchLog, target = {}) {
if (!patchLog)
return target;
for (const patchItem of patchLog) {
const difPath = asLodashPath(patchItem.path);
if (patchItem.op === "remove") {
unset(target, difPath);
}
else {
set(target, difPath, patchItem.value);
}
}
return target;
}
export function deepPatchLog(lhsObj, rhsObj, orderInd = false, storePrev = false) {
const differences = deepDiffLow(lhsObj, rhsObj, orderInd);
return !differences ? [] : diffToPatchLog(differences, storePrev);
}
;
function escapePathPart(path) {
if (typeof path === 'number')
return path.toString();
if (typeof path === 'symbol')
return path.toString();
if (path.indexOf('/') === -1 && path.indexOf('~') === -1)
return path;
return path.replace(/~/g, '~0').replace(/\//g, '~1');
}
function unescapePathPart(path) {
return path.replace(/~1/g, '/').replace(/~0/g, '~');
}
function asJsonPointer(path) {
return !(path === null || path === void 0 ? void 0 : path.length) ? ""
: "/" + path.map((s) => escapePathPart(s)).join("/");
}
export function asLodashPath(pointer) {
if (!pointer || !pointer.startsWith("/"))
return [];
const parts = pointer.slice(1).split("/")
.map((s) => unescapePathPart(s));
return !(parts === null || parts === void 0 ? void 0 : parts.length) ? [] : toPath(parts.join("."));
}
export function getValueByPointer(document, pointer) {
return pointer === "" ? document
: get(document, asLodashPath(pointer));
}