scxml-dynamic-name-match-transition-selector.js

//   Copyright 2011-2012 Jacob Beard, INFICON, and other SCION contributors
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

"use strict";

var eventNameReCache = {};

function eventNameToRe(name) {
    return new RegExp("^" + (name.replace(/\./g, "\\.")) + "(\\.[0-9a-zA-Z]+)*$");
}

function retrieveEventRe(name) {
    return eventNameReCache[name] ? eventNameReCache[name] : eventNameReCache[name] = eventNameToRe(name);
}

function nameMatch(t, eventNames) {
    var tEvents = t.events;
    var f = 
        tEvents.indexOf("*") > -1 ? 
            function() { return true; } : 
            function(name) {
                return tEvents.filter(function(tEvent){
                    return retrieveEventRe(tEvent).test(name);
                }).length;
            };
    return eventNames.filter(f).length;
}

module.exports = function(state, eventNames, evaluator) {
    return state.transitions.filter(function(t){
        return (!t.events || nameMatch(t,eventNames)) && (!t.cond || evaluator(t));
    });
};