javascript string match automata. (tobefixed)

automata.js

var string_automata = function (string) {
    var length = string.length;
    var init = string[0];
    var automata = [];
    automata[0][init] = [1];

    // var get_state_by_id = function (id) {
    //     return automata[id];
    // }
    
    var update_next_state = function (input, cur_id) {
        if (cur_id === length) {
            return true;
        }

        var cur_state = automata[cur_id];
        var next_list = [];
        if (!cur_state[input]) {
            return [0];
        }

        cur_state[input].forEach (function (i) {
            if (automata[i][input]) {
                next_list.concat (automata[i][input]);
            }
        });
        
        if (input === init) {
            next_list.push(1)
        }
        
        next_list.push(cur_id+2);
        automata[cur_id+1][input] = new_list;
        return false
    };
};