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/*
const obj1 = {a: 4, b: 5};
const obj2 = {a: 3, b: 5};
const obj3 = {a: 4, c: 5};
diff(obj1, obj2);
[
{ "op": "replace", "path": ['a'], "value": 3 }
]
diff(obj2, obj3);
[
{ "op": "remove", "path": ['b'] },
{ "op": "replace", "path": ['a'], "value": 4 }
{ "op": "add", "path": ['c'], "value": 5 }
]
// using converter to generate jsPatch standard paths
// see http://jsonpatch.com
import {diff, jsonPatchPathConverter} from 'just-diff'
diff(obj1, obj2, jsonPatchPathConverter);
[
{ "op": "replace", "path": '/a', "value": 3 }
]
diff(obj2, obj3, jsonPatchPathConverter);
[
{ "op": "remove", "path": '/b' },
{ "op": "replace", "path": '/a', "value": 4 }
{ "op": "add", "path": '/c', "value": 5 }
]
// arrays
const obj4 = {a: 4, b: [1, 2, 3]};
const obj5 = {a: 3, b: [1, 2, 4]};
const obj6 = {a: 3, b: [1, 2, 4, 5]};
diff(obj4, obj5);
[
{ "op": "replace", "path": ['a'], "value": 3 }
{ "op": "replace", "path": ['b', 2], "value": 4 }
]
diff(obj5, obj6);
[
{ "op": "add", "path": ['b', 3], "value": 5 }
]
// nested paths
const obj7 = {a: 4, b: {c: 3}};
const obj8 = {a: 4, b: {c: 4}};
const obj9 = {a: 5, b: {d: 4}};
diff(obj7, obj8);
[
{ "op": "replace", "path": ['b', 'c'], "value": 4 }
]
diff(obj8, obj9);
[
{ "op": "replace", "path": ['a'], "value": 5 }
{ "op": "remove", "path": ['b', 'c']}
{ "op": "add", "path": ['b', 'd'], "value": 4 }
]
*/
function diff(obj1, obj2, pathConverter) {
if (!obj1 || typeof obj1 != 'object' || !obj2 || typeof obj2 != 'object') {
throw new Error('both arguments must be objects or arrays');
}
pathConverter ||
(pathConverter = function(arr) {
return arr;
});
function getDiff(obj1, obj2, basePath, diffs) {
var obj1Keys = Object.keys(obj1);
var obj1KeysLength = obj1Keys.length;
var obj2Keys = Object.keys(obj2);
var obj2KeysLength = obj2Keys.length;
var path;
for (var i = 0; i < obj1KeysLength; i++) {
var key = Array.isArray(obj1) ? Number(obj1Keys[i]) : obj1Keys[i];
if (!(key in obj2)) {
path = basePath.concat(key);
diffs.remove.push({
op: 'remove',
path: pathConverter(path),
});
}
}
for (var i = 0; i < obj2KeysLength; i++) {
var key = Array.isArray(obj2) ? Number(obj2Keys[i]) : obj2Keys[i];
var obj1AtKey = obj1[key];
var obj2AtKey = obj2[key];
if (!(key in obj1)) {
path = basePath.concat(key);
var obj2Value = obj2[key];
diffs.add.push({
op: 'add',
path: pathConverter(path),
value: obj2Value,
});
} else if (obj1AtKey !== obj2AtKey) {
if (
Object(obj1AtKey) !== obj1AtKey ||
Object(obj2AtKey) !== obj2AtKey
) {
path = pushReplace(path, basePath, key, diffs, pathConverter, obj2);
} else {
if (
!Object.keys(obj1AtKey).length &&
!Object.keys(obj2AtKey).length &&
String(obj1AtKey) != String(obj2AtKey)
) {
path = pushReplace(path, basePath, key, diffs, pathConverter, obj2);
} else {
getDiff(obj1[key], obj2[key], basePath.concat(key), diffs);
}
}
}
}
return diffs;
}
const finalDiffs = getDiff(obj1, obj2, [], {remove: [], replace: [], add: []});
return finalDiffs.remove
.reverse()
.concat(finalDiffs.replace)
.concat(finalDiffs.add);
}
function pushReplace(path, basePath, key, diffs, pathConverter, obj2) {
path = basePath.concat(key);
diffs.replace.push({
op: 'replace',
path: pathConverter(path),
value: obj2[key],
});
return path;
}
function jsonPatchPathConverter(arrayPath) {
return [''].concat(arrayPath).join('/');
}
export {diff, jsonPatchPathConverter};
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