module.exports = function(functions, tree) {
    functions.functionRegistry.addMultiple({
        e: function (str) {
            return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str.value);
        },
        escape: function (str) {
            return new(tree.Anonymous)(encodeURI(str.value).replace(/=/g, "%3D").replace(/:/g, "%3A").replace(/#/g, "%23").replace(/;/g, "%3B").replace(/\(/g, "%28").replace(/\)/g, "%29"));
        },
        replace: function (string, pattern, replacement, flags) {
            var result = string.value;

            result = result.replace(new RegExp(pattern.value, flags ? flags.value : ''), replacement.value);
            return new(tree.Quoted)(string.quote || '', result, string.escaped);
        },
        '%': function (string /* arg, arg, ...*/) {
            var args = Array.prototype.slice.call(arguments, 1),
                result = string.value;

            for (var i = 0; i < args.length; i++) {
                /*jshint loopfunc:true */
                result = result.replace(/%[sda]/i, function(token) {
                    var value = token.match(/s/i) ? args[i].value : args[i].toCSS();
                    return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
                });
            }
            result = result.replace(/%%/g, '%');
            return new(tree.Quoted)(string.quote || '', result, string.escaped);
        }
    });
};