nathan

~ function(exp) {
    function Rule(name, symbols, postprocess) {
        this.name = name;
        this.symbols = symbols;
        this.postprocess = postprocess || function(a){return a};
    }
    Rule.prototype.getStartState = function(location) {
        return new State(this, 0, location);
    }
    function State(rule, expect, reference) {