joannangx/visionaria_app

'use strict';
var isObj = require('is-obj');

module.exports.get = function (obj, path) {
    if (!isObj(obj) || typeof path !== 'string') {
        return obj;
    }

    var pathArr = getPathSegments(path);

    for (var i = 0; i < pathArr.length; i++) {
        var descriptor = Object.getOwnPropertyDescriptor(obj, pathArr[i]) || Object.getOwnPropertyDescriptor(Object.prototype, pathArr[i]);
        if (descriptor && !descriptor.enumerable) {
            return;
        }

        obj = obj[pathArr[i]];

        if (obj === undefined || obj === null) {
            // `obj` is either `undefined` or `null` so we want to stop the loop, and
            // if this is not the last bit of the path, and
            // if it did't return `undefined`
            // it would return `null` if `obj` is `null`
            // but we want `get({foo: null}, 'foo.bar')` to equal `undefined` not `null`
            if (i !== pathArr.length - 1) {
                return undefined;
            }

            break;
        }
    }

    return obj;
};

module.exports.set = function (obj, path, value) {
    if (!isObj(obj) || typeof path !== 'string') {
        return;
    }

    var pathArr = getPathSegments(path);

    for (var i = 0; i < pathArr.length; i++) {
        var p = pathArr[i];

        if (!isObj(obj[p])) {
            obj[p] = {};
        }

        if (i === pathArr.length - 1) {
            obj[p] = value;
        }

        obj = obj[p];
    }
};

module.exports.delete = function (obj, path) {
    if (!isObj(obj) || typeof path !== 'string') {
        return;
    }

    var pathArr = getPathSegments(path);

    for (var i = 0; i < pathArr.length; i++) {
        var p = pathArr[i];

        if (i === pathArr.length - 1) {
            delete obj[p];
            return;
        }

        obj = obj[p];
    }
};

module.exports.has = function (obj, path) {
    if (!isObj(obj) || typeof path !== 'string') {
        return false;
    }

    var pathArr = getPathSegments(path);

    for (var i = 0; i < pathArr.length; i++) {
        obj = obj[pathArr[i]];

        if (obj === undefined) {
            return false;
        }
    }

    return true;
};

function getPathSegments(path) {
    var pathArr = path.split('.');
    var parts = [];

    for (var i = 0; i < pathArr.length; i++) {
        var p = pathArr[i];

        while (p[p.length - 1] === '\\' && pathArr[i + 1] !== undefined) {
            p = p.slice(0, -1) + '.';
            p += pathArr[++i];
        }

        parts.push(p);
    }

    return parts;
}