@textback/notification-widget/src/libraries/t.js

TODO: Give a short introduction of your project. Let this section explain the objectives or the motivation behind this project.

// local-scoped modification of https://github.com/jasonmoo/t.js
var blockregex = /\{\{(([@!]?)(.+?))\}\}(([\s\S]+?)(\{\{:\1\}\}([\s\S]+?))?)\{\{\/\1\}\}/g,
    valregex = /\{\{([=%])(.+?)\}\}/g;

function t(template) {
    this.t = template;
}

function scrub(val) {
    return new Option(val).innerHTML.replace(/"/g,""");
}

function get_value(vars, key) {
    var parts = key.split('.');
    while (parts.length) {
        if (!(parts[0] in vars)) {
            return false;
        }
        vars = vars[parts.shift()];
    }
    return vars;
}

function render(fragment, vars) {
    return fragment
        .replace(blockregex, function(_, __, meta, key, inner, if_true, has_else, if_false) {

            var val = get_value(vars,key), temp = "", i;

            if (!val) {

                // handle if not
                if (meta == '!') {
                    return render(inner, vars);
                }
                // check for else
                if (has_else) {
                    return render(if_false, vars);
                }

                return "";
            }

            // regular if
            if (!meta) {
                return render(if_true, vars);
            }

            // process array/obj iteration
            if (meta == '@') {
                // store any previous vars
                // reuse existing vars
                _ = vars._key;
                __ = vars._val;
                for (i in val) {
                    if (val.hasOwnProperty(i)) {
                        vars._key = i;
                        vars._val = val[i];
                        temp += render(inner, vars);
                    }
                }
                vars._key = _;
                vars._val = __;
                return temp;
            }

        })
        .replace(valregex, function(_, meta, key) {
            var val = get_value(vars,key);

            if (val || val === 0) {
                return meta == '%' ? scrub(val) : val;
            }
            return "";
        });
}

t.prototype.render = function (vars) {
    return render(this.t, vars);
};

export default t;