formatter.js

module.exports = (function () {
    var tokenRegex = /\{([^\}]+)\}/g,
        objNotationRegex = /(?:(?:^|\.)(.+?)(?=\[|\.|$|\()|\[('|")(.+?)\2\])(\(\))?/g, // matches .xxxxx or ["xxxxx"] to run over object properties
        replacer = function (all, key, obj) {
            var res = obj;
            key.replace(objNotationRegex, function (all, name, quote, quotedName, isFunc) {
                name = name || quotedName;
                if (res) {
                    if (name in res) {
                        res = res[name];
                    }
                    typeof res == "function" && isFunc && (res = res());
                }
            });
            res = (res == null || res == obj ? all : res) + "";
            return res;
        };
    return function (str, obj) {
        return String(str).replace(tokenRegex, function (all, key) {
            return replacer(all, key, obj);
        });
    };
})();