// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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var common = require('./common');
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var assert = require('assert');
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var events = require('../');
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var test = require('tape');
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function expect(expected) {
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var actual = [];
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test.onFinish(function() {
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var sortedActual = actual.sort();
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var sortedExpected = expected.sort();
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assert.strictEqual(sortedActual.length, sortedExpected.length);
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for (var index = 0; index < sortedActual.length; index++) {
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var value = sortedActual[index];
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assert.strictEqual(value, sortedExpected[index]);
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}
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});
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function listener(name) {
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actual.push(name);
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}
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return common.mustCall(listener, expected.length);
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}
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{
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var ee = new events.EventEmitter();
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var noop = common.mustNotCall();
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ee.on('foo', noop);
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ee.on('bar', noop);
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ee.on('baz', noop);
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ee.on('baz', noop);
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var fooListeners = ee.listeners('foo');
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var barListeners = ee.listeners('bar');
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var bazListeners = ee.listeners('baz');
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ee.on('removeListener', expect(['bar', 'baz', 'baz']));
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ee.removeAllListeners('bar');
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ee.removeAllListeners('baz');
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var listeners = ee.listeners('foo');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 1);
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assert.strictEqual(listeners[0], noop);
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listeners = ee.listeners('bar');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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listeners = ee.listeners('baz');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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// After calling removeAllListeners(),
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// the old listeners array should stay unchanged.
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assert.strictEqual(fooListeners.length, 1);
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assert.strictEqual(fooListeners[0], noop);
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assert.strictEqual(barListeners.length, 1);
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assert.strictEqual(barListeners[0], noop);
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assert.strictEqual(bazListeners.length, 2);
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assert.strictEqual(bazListeners[0], noop);
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assert.strictEqual(bazListeners[1], noop);
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// After calling removeAllListeners(),
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// new listeners arrays is different from the old.
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assert.notStrictEqual(ee.listeners('bar'), barListeners);
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assert.notStrictEqual(ee.listeners('baz'), bazListeners);
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}
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{
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var ee = new events.EventEmitter();
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ee.on('foo', common.mustNotCall());
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ee.on('bar', common.mustNotCall());
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// Expect LIFO order
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ee.on('removeListener', expect(['foo', 'bar', 'removeListener']));
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ee.on('removeListener', expect(['foo', 'bar']));
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ee.removeAllListeners();
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var listeners = ee.listeners('foo');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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listeners = ee.listeners('bar');
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assert.ok(Array.isArray(listeners));
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assert.strictEqual(listeners.length, 0);
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}
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{
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var ee = new events.EventEmitter();
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ee.on('removeListener', common.mustNotCall());
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// Check for regression where removeAllListeners() throws when
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// there exists a 'removeListener' listener, but there exists
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// no listeners for the provided event type.
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assert.doesNotThrow(function () { ee.removeAllListeners(ee, 'foo') });
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}
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{
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var ee = new events.EventEmitter();
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var expectLength = 2;
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ee.on('removeListener', function() {
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assert.strictEqual(expectLength--, this.listeners('baz').length);
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});
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ee.on('baz', common.mustNotCall());
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ee.on('baz', common.mustNotCall());
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ee.on('baz', common.mustNotCall());
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assert.strictEqual(ee.listeners('baz').length, expectLength + 1);
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ee.removeAllListeners('baz');
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assert.strictEqual(ee.listeners('baz').length, 0);
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}
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{
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var ee = new events.EventEmitter();
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assert.strictEqual(ee, ee.removeAllListeners());
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}
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{
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var ee = new events.EventEmitter();
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ee._events = undefined;
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assert.strictEqual(ee, ee.removeAllListeners());
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}
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