web-ui-pack/helpers/nestedProperty.js

Web package with UI elements

const nestedProperty = {
    parsePath(path) {
        const keys = [];
        const isArray = [];
        let start = 0;
        for (let i = 0; i < path.length; i++) {
            const c = path[i];
            const isNextArr = c === "[";
            if (isNextArr || c === ".") {
                if (i > start) {
                    keys.push(path.substring(start, i));
                    isArray.push(isNextArr);
                }
                if (isNextArr) {
                    const close = path.indexOf("]", i);
                    keys.push(path.substring(i + 1, close));
                    isArray.push(false);
                    i = close;
                }
                start = i + 1;
            }
        }
        if (start < path.length) {
            keys.push(path.substring(start));
            isArray.push(false);
        }
        return [keys, isArray];
    },
    set(obj, path, value) {
        if (!path) {
            return obj;
        }
        const result = obj;
        const [propKeys, isArray] = nestedProperty.parsePath(path);
        let key = propKeys[0];
        for (let i = 0; i < propKeys.length - 1; key = propKeys[++i]) {
            if (!obj[key]) {
                obj[key] = (isArray[i] ? [] : {});
            }
            obj = obj[key];
        }
        obj[key] = value;
        return result;
    },
    get(obj, path, out) {
        if (!path) {
            return undefined;
        }
        const [propKeys] = nestedProperty.parsePath(path);
        let next = obj;
        for (let i = 0; i < propKeys.length; ++i) {
            if (next == null) {
                break;
            }
            const key = propKeys[i];
            if (out != null) {
                out.hasProp = key in next;
            }
            next = next[key];
        }
        return next;
    },
};
export default nestedProperty;