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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.JsonDiffType = void 0;
exports.isJsonChange = isJsonChange;
exports.jsonDiff = jsonDiff;
exports.walkJsonTree = walkJsonTree;
exports.deepEquals = deepEquals;
var JsonDiffType;
(function (JsonDiffType) {
JsonDiffType["Deleted"] = "JsonPropertyDeleted";
JsonDiffType["Added"] = "JsonPropertyAdded";
JsonDiffType["Modified"] = "JsonPropertyModified";
})(JsonDiffType || (exports.JsonDiffType = JsonDiffType = {}));
function isJsonChange(change) {
return (change.type === JsonDiffType.Added ||
change.type === JsonDiffType.Deleted ||
change.type === JsonDiffType.Modified);
}
function jsonDiff(lhs, rhs) {
const result = [];
const seenInLhs = new Set();
walkJsonTree(lhs, [], (path, lhsValue) => {
seenInLhs.add(hashArray(path));
const rhsValue = getJsonValue(path, rhs);
if (rhsValue === undefined) {
result.push({
type: JsonDiffType.Deleted,
path,
value: {
lhs: lhsValue,
rhs: undefined,
},
});
}
else if (!deepEquals(lhsValue, rhsValue)) {
result.push({
type: JsonDiffType.Modified,
path,
value: {
lhs: lhsValue,
rhs: rhsValue,
},
});
}
return typeof lhsValue === 'object' || Array.isArray(lhsValue);
});
walkJsonTree(rhs, [], (path, rhsValue) => {
const addedInRhs = !seenInLhs.has(hashArray(path));
if (addedInRhs) {
result.push({
type: JsonDiffType.Added,
path,
value: {
lhs: undefined,
rhs: rhsValue,
},
});
}
return typeof rhsValue === 'object' || Array.isArray(rhsValue);
});
return result;
}
// Depth-first walk down JSON tree.
function walkJsonTree(json, currPath, visitor) {
if (!json || typeof json !== 'object') {
return;
}
Object.keys(json).forEach((key) => {
const path = currPath.concat([key]);
const shouldContinue = visitor(path, json[key]);
if (shouldContinue) {
walkJsonTree(json[key], path, visitor);
}
});
}
function hashArray(ary) {
return JSON.stringify(ary);
}
function getJsonValue(path, json) {
let curr = json;
for (const k of path) {
curr = curr[k];
if (curr === undefined) {
break;
}
}
return curr;
}
function deepEquals(a, b) {
if (a === b) {
return true;
}
// Values do not need to be checked for deep equality and the above is false
if (
// Values are different types
typeof a !== typeof b ||
// Values are the same type but not an object or array
(typeof a !== 'object' && !Array.isArray(a)) ||
// Objects are the same type, objects or arrays, but do not have the same number of keys
Object.keys(a).length !== Object.keys(b).length) {
return false;
}
// Values need to be checked for deep equality
return Object.entries(a).reduce((equal, [key, aValue]) => {
// Skip other keys if it is already not equal.
if (!equal) {
return equal;
}
// Traverse the object
return deepEquals(aValue, b[key]);
}, true);
}