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traversalTracker.js
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traversalTracker.js
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/* jslint node: true */
'use strict';
/**
* Creates an instance of TraversalTracker
*
* @constructor
*/
function TraversalTracker() {
this.events = {};
}
TraversalTracker.prototype.startTracking = function(event, cb) {
var callbacks = (this.events[event] || (this.events[event] = []));
if (callbacks.indexOf(cb) < 0) {
callbacks.push(cb);
}
};
TraversalTracker.prototype.stopTracking = function(event, cb) {
var callbacks = this.events[event];
if (callbacks) {
var index = callbacks.indexOf(cb);
if (index >= 0) {
callbacks.splice(index, 1);
}
}
};
TraversalTracker.prototype.emit = function(event) {
var args = Array.prototype.slice.call(arguments, 1);
var callbacks = this.events[event];
if (callbacks) {
callbacks.forEach(function(cb) {
cb.apply(this, args);
});
}
};
TraversalTracker.prototype.auto = function(event, cb, innerBlock) {
this.startTracking(event, cb);
innerBlock();
this.stopTracking(event, cb);
};
module.exports = TraversalTracker;