'use strict'; /**

* @module JSONStream
*/

/**

* Module dependencies.
*/

var Base = require('./base'); var constants = require('../runner').constants; var EVENT_TEST_PASS = constants.EVENT_TEST_PASS; var EVENT_TEST_FAIL = constants.EVENT_TEST_FAIL; var EVENT_RUN_BEGIN = constants.EVENT_RUN_BEGIN; var EVENT_RUN_END = constants.EVENT_RUN_END;

/**

* Expose `JSONStream`.
*/

exports = module.exports = JSONStream;

/**

* Constructs a new `JSONStream` reporter instance.
*
* @public
* @class
* @memberof Mocha.reporters
* @extends Mocha.reporters.Base
* @param {Runner} runner - Instance triggers reporter actions.
* @param {Object} [options] - runner options
*/

function JSONStream(runner, options) {

Base.call(this, runner, options);

var self = this;
var total = runner.total;

runner.once(EVENT_RUN_BEGIN, function() {
  writeEvent(['start', {total: total}]);
});

runner.on(EVENT_TEST_PASS, function(test) {
  writeEvent(['pass', clean(test)]);
});

runner.on(EVENT_TEST_FAIL, function(test, err) {
  test = clean(test);
  test.err = err.message;
  test.stack = err.stack || null;
  writeEvent(['fail', test]);
});

runner.once(EVENT_RUN_END, function() {
  writeEvent(['end', self.stats]);
});

}

/**

* Mocha event to be written to the output stream.
* @typedef {Array} JSONStream~MochaEvent
*/

/**

* Writes Mocha event to reporter output stream.
*
* @private
* @param {JSONStream~MochaEvent} event - Mocha event to be output.
*/

function writeEvent(event) {

process.stdout.write(JSON.stringify(event) + '\n');

}

/**

* Returns an object literal representation of `test`
* free of cyclic properties, etc.
*
* @private
* @param {Test} test - Instance used as data source.
* @return {Object} object containing pared-down test instance data
*/

function clean(test) {

return {
  title: test.title,
  fullTitle: test.fullTitle(),
  duration: test.duration,
  currentRetry: test.currentRetry()
};

}

JSONStream.description = 'newline delimited JSON events';