152 lines
3.5 KiB
TypeScript
152 lines
3.5 KiB
TypeScript
import { JsonValue } from "../components/DynamicJsonForm";
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export type JsonObject = { [key: string]: JsonValue };
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/**
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* Updates a value at a specific path in a nested JSON structure
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* @param obj The original JSON value
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* @param path Array of keys/indices representing the path to the value
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* @param value The new value to set
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* @returns A new JSON value with the updated path
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*/
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export function updateValueAtPath(
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obj: JsonValue,
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path: string[],
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value: JsonValue,
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): JsonValue {
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if (path.length === 0) return value;
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if (obj === null || obj === undefined) {
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obj = !isNaN(Number(path[0])) ? [] : {};
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}
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if (Array.isArray(obj)) {
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return updateArray(obj, path, value);
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}
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else if (typeof obj === "object" && obj !== null) {
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return updateObject(obj as JsonObject, path, value);
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}
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else {
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console.error(
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`Cannot update path ${path.join(".")} in non-object/array value:`,
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obj,
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);
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return obj;
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}
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}
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/**
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* Updates an array at a specific path
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*/
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function updateArray(
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array: JsonValue[],
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path: string[],
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value: JsonValue,
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): JsonValue[] {
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const [index, ...restPath] = path;
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const arrayIndex = Number(index);
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if (isNaN(arrayIndex)) {
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console.error(`Invalid array index: ${index}`);
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return array;
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}
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if (arrayIndex < 0) {
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console.error(`Array index out of bounds: ${arrayIndex} < 0`);
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return array;
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}
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let newArray: JsonValue[] = [];
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for (let i = 0; i < array.length; i++) {
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newArray[i] = i in array ? array[i] : null;
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}
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if (arrayIndex >= newArray.length) {
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const extendedArray: JsonValue[] = new Array(arrayIndex).fill(null);
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// Copy over the existing elements (now guaranteed to be dense)
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for (let i = 0; i < newArray.length; i++) {
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extendedArray[i] = newArray[i];
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}
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newArray = extendedArray;
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}
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if (restPath.length === 0) {
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newArray[arrayIndex] = value;
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} else {
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newArray[arrayIndex] = updateValueAtPath(
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newArray[arrayIndex],
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restPath,
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value,
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);
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}
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return newArray;
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}
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/**
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* Updates an object at a specific path
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*/
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function updateObject(
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obj: JsonObject,
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path: string[],
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value: JsonValue,
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): JsonObject {
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const [key, ...restPath] = path;
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// Validate object key
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if (typeof key !== "string") {
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console.error(`Invalid object key: ${key}`);
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return obj;
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}
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const newObj = { ...obj };
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if (restPath.length === 0) {
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newObj[key] = value;
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} else {
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// Ensure key exists
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if (!(key in newObj)) {
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newObj[key] = {};
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}
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newObj[key] = updateValueAtPath(newObj[key], restPath, value);
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}
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return newObj;
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}
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/**
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* Gets a value at a specific path in a nested JSON structure
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* @param obj The JSON value to traverse
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* @param path Array of keys/indices representing the path to the value
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* @param defaultValue Value to return if path doesn't exist
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* @returns The value at the path, or defaultValue if not found
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*/
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export function getValueAtPath(
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obj: JsonValue,
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path: string[],
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defaultValue: JsonValue = null,
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): JsonValue {
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if (path.length === 0) return obj;
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const [first, ...rest] = path;
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if (obj === null || obj === undefined) {
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return defaultValue;
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}
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if (Array.isArray(obj)) {
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const index = Number(first);
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if (isNaN(index) || index < 0 || index >= obj.length) {
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return defaultValue;
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}
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return getValueAtPath(obj[index], rest, defaultValue);
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}
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if (typeof obj === "object" && obj !== null) {
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if (!(first in obj)) {
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return defaultValue;
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}
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return getValueAtPath((obj as JsonObject)[first], rest, defaultValue);
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}
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return defaultValue;
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}
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