workflow-4-node/lib/es6/hosting/instanceIdParser.js

Workflow 4 Node is a .NET Workflow Foundation like framework for Node.js. The goal is to reach feature equivalence and beyond.

/* jshint -W054*/
"use strict";

let _ = require("lodash");
let is = require("../common/is");

function InstanceIdParser() {
    this._cache = {};
}

InstanceIdParser.prototype.parse = function (path, obj) {
    if (!obj) {
        throw new Error("Argument 'obj' expected.");
    }
    if (!_.isString(path)) {
        throw new TypeError("Argument 'path' is not a string.");
    }

    let parser = this._cache[path];
    if (_.isUndefined(parser)) {
        this._cache[path] = parser = this._createParser(path);
    }

    return parser.call(obj);
};

InstanceIdParser.prototype._createParser = function (path) {
    if (path.indexOf("this") !== 0) {
        if (path[0] === "[") {
            path = "this" + path;
        }
        else {
            path = "this." + path;
        }
    }

    return new Function("return (" + path + ").toString();");
};

module.exports = InstanceIdParser;