/** @file Observes a JSInterpreter and logs to the designated browser console. */

var Observer = require('./Observer');

/**

* Observer responsible for logging to the provided browser console when

* the interpreter it is observing raises log-worthy events.

* @constructor

* @implements LogTarget

* @param {Console} window console API

*/

var JsInterpreterLogger = (module.exports = function (outputConsole) {

/** @private {Console} */

this.outputConsole_ = outputConsole;

/** @private {Observer} */

this.observer_ = new Observer();

});

/**

* Attach the logger to a particular JSInterpreter instance.

* @param {JSInterpreter} jsInterpreter

*/

JsInterpreterLogger.prototype.attachTo = function (jsInterpreter) {

this.observer_.observe(jsInterpreter.onExecutionWarning, this.log.bind(this));

};

/**

* Detach the logger from whatever interpreter instance it is currently

* attached to, unregistering handlers.

* Safe to call when the logger is already detached.

*/

JsInterpreterLogger.prototype.detach = function () {

this.observer_.unobserveAll();

};

/**

* Log to the console object we were constructed with.

* @param {*} arguments...

* @see Console.log

*/

JsInterpreterLogger.prototype.log = function () {

if (!IN_UNIT_TEST && this.outputConsole_ && this.outputConsole_.log) {

this.outputConsole_.log.apply(this.outputConsole_, arguments);

}

};

/**

* Clear the console object we were constructed with

* @see Console.clear

*/

JsInterpreterLogger.prototype.clear = function () {

if (!IN_UNIT_TEST && this.outputConsole_ && this.outputConsole_.clear) {

this.outputConsole_.clear();

}

};