// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Set to true when the Document is loaded IFF "test=true" is in the query
// string.
var isTest = false;
// Set to true when loading a "Release" NaCl module, false when loading a
// "Debug" NaCl module.
var isRelease = true;
// Javascript module pattern:
// see http://en.wikipedia.org/wiki/Unobtrusive_JavaScript#Namespaces
// In essence, we define an anonymous function which is immediately called and
// returns a new object. The new object contains only the exported definitions;
// all other definitions in the anonymous function are inaccessible to external
// code.
var common = (function() {
function isHostToolchain(tool) {
return tool == 'win' || tool == 'linux' || tool == 'mac';
}
/**
* Return the mime type for NaCl plugin.
*
* @param {string} tool The name of the toolchain, e.g. "glibc", "newlib" etc.
* @return {string} The mime-type for the kind of NaCl plugin matching
* the given toolchain.
*/
function mimeTypeForTool(tool) {
// For NaCl modules use application/x-nacl.
var mimetype = 'application/x-nacl';
if (isHostToolchain(tool)) {
// For non-NaCl PPAPI plugins use the x-ppapi-debug/release
// mime type.
if (isRelease)
mimetype = 'application/x-ppapi-release';
else
mimetype = 'application/x-ppapi-debug';
} else if (tool == 'pnacl') {
mimetype = 'application/x-pnacl';
}
return mimetype;
}
/**
* Check if the browser supports NaCl plugins.
*
* @param {string} tool The name of the toolchain, e.g. "glibc", "newlib" etc.
* @return {bool} True if the browser supports the type of NaCl plugin
* produced by the given toolchain.
*/
function browserSupportsNaCl(tool) {
// Assume host toolchains always work with the given browser.
// The below mime-type checking might not work with
// --register-pepper-plugins.
if (isHostToolchain(tool)) {
return true;
}
var mimetype = mimeTypeForTool(tool);
return navigator.mimeTypes[mimetype] !== undefined;
}
/**
* Inject a script into the DOM, and call a callback when it is loaded.
*
* @param {string} url The url of the script to load.
* @param {Function} onload The callback to call when the script is loaded.
* @param {Function} onerror The callback to call if the script fails to load.
*/
function injectScript(url, onload, onerror) {
var scriptEl = document.createElement('script');
scriptEl.type = 'text/javascript';
scriptEl.src = url;
scriptEl.onload = onload;
if (onerror) {
scriptEl.addEventListener('error', onerror, false);
}
document.head.appendChild(scriptEl);
}
/**
* Run all tests for this example.
*
* @param {Object} moduleEl The module DOM element.
*/
function runTests(moduleEl) {
console.log('runTests()');
common.tester = new Tester();
// All NaCl SDK examples are OK if the example exits cleanly; (i.e. the
// NaCl module returns 0 or calls exit(0)).
//
// Without this exception, the browser_tester thinks that the module
// has crashed.
common.tester.exitCleanlyIsOK();
common.tester.addAsyncTest('loaded', function(test) {
test.pass();
});
if (typeof window.addTests !== 'undefined') {
window.addTests();
}
common.tester.waitFor(moduleEl);
common.tester.run();
}
/**
* Create the Native Client <embed> element as a child of the DOM element
* named "listener".
*
* @param {string} name The name of the example.
* @param {string} tool The name of the toolchain, e.g. "glibc", "newlib" etc.
* @param {string} path Directory name where .nmf file can be found.
* @param {number} width The width to create the plugin.
* @param {number} height The height to create the plugin.
* @param {Object} attrs Dictionary of attributes to set on the module.
*/
function createNaClModule(name, tool, path, width, height, attrs) {
var moduleEl = document.createElement('embed');
moduleEl.setAttribute('name', 'nacl_module');
moduleEl.setAttribute('id', 'nacl_module');
moduleEl.setAttribute('width', width);
moduleEl.setAttribute('height', height);
moduleEl.setAttribute('path', path);
moduleEl.setAttribute('src', path + '/' + name + '.nmf');
// Add any optional arguments
if (attrs) {
for (var key in attrs) {
moduleEl.setAttribute(key, attrs[key]);
}
}
var mimetype = mimeTypeForTool(tool);
moduleEl.setAttribute('type', mimetype);
// The <EMBED> element is wrapped inside a <DIV>, which has both a 'load'
// and a 'message' event listener attached. This wrapping method is used
// instead of attaching the event listeners directly to the <EMBED> element
// to ensure that the listeners are active before the NaCl module 'load'
// event fires.
var listenerDiv = document.getElementById('listener');
listenerDiv.appendChild(moduleEl);
// Request the offsetTop property to force a relayout. As of Apr 10, 2014
// this is needed if the module is being loaded on a Chrome App's
// background page (see crbug.com/350445).
moduleEl.offsetTop;
// Host plugins don't send a moduleDidLoad message. We'll fake it here.
var isHost = isHostToolchain(tool);
if (isHost) {
window.setTimeout(function() {
moduleEl.readyState = 1;
moduleEl.dispatchEvent(new CustomEvent('loadstart'));
moduleEl.readyState = 4;
moduleEl.dispatchEvent(new CustomEvent('load'));
moduleEl.dispatchEvent(new CustomEvent('loadend'));
}, 100); // 100 ms
}
// This is code that is only used to test the SDK.
if (isTest) {
var loadNaClTest = function() {
injectScript('nacltest.js', function() {
runTests(moduleEl);
});
};
// Try to load test.js for the example. Whether or not it exists, load
// nacltest.js.
injectScript('test.js', loadNaClTest, loadNaClTest);
}
}
/**
* Add the default "load" and "message" event listeners to the element with
* id "listener".
*
* The "load" event is sent when the module is successfully loaded. The
* "message" event is sent when the naclModule posts a message using
* PPB_Messaging.PostMessage() (in C) or pp::Instance().PostMessage() (in
* C++).
*/
function attachDefaultListeners() {
var listenerDiv = document.getElementById('listener');
listenerDiv.addEventListener('load', moduleDidLoad, true);
listenerDiv.addEventListener('message', handleMessage, true);
listenerDiv.addEventListener('error', handleError, true);
listenerDiv.addEventListener('crash', handleCrash, true);
if (typeof window.attachListeners !== 'undefined') {
window.attachListeners();
}
}
/**
* Called when the NaCl module fails to load.
*
* This event listener is registered in createNaClModule above.
*/
function handleError(event) {
// We can't use common.naclModule yet because the module has not been
// loaded.
var moduleEl = document.getElementById('nacl_module');
updateStatus('ERROR [' + moduleEl.lastError + ']');
}
/**
* Called when the Browser can not communicate with the Module
*
* This event listener is registered in attachDefaultListeners above.
*/
function handleCrash(event) {
if (common.naclModule.exitStatus == -1) {
updateStatus('CRASHED');
} else {
updateStatus('EXITED [' + common.naclModule.exitStatus + ']');
}
if (typeof window.handleCrash !== 'undefined') {
window.handleCrash(common.naclModule.lastError);
}
}
/**
* Called when the NaCl module is loaded.
*
* This event listener is registered in attachDefaultListeners above.
*/
function moduleDidLoad() {
common.naclModule = document.getElementById('nacl_module');
updateStatus('RUNNING');
if (typeof window.moduleDidLoad !== 'undefined') {
window.moduleDidLoad();
}
}
/**
* Hide the NaCl module's embed element.
*
* We don't want to hide by default; if we do, it is harder to determine that
* a plugin failed to load. Instead, call this function inside the example's
* "moduleDidLoad" function.
*
*/
function hideModule() {
// Setting common.naclModule.style.display = "None" doesn't work; the
// module will no longer be able to receive postMessages.
common.naclModule.style.height = '0';
}
/**
* Remove the NaCl module from the page.
*/
function removeModule() {
common.naclModule.parentNode.removeChild(common.naclModule);
common.naclModule = null;
}
/**
* Return true when |s| starts with the string |prefix|.
*
* @param {string} s The string to search.
* @param {string} prefix The prefix to search for in |s|.
*/
function startsWith(s, prefix) {
// indexOf would search the entire string, lastIndexOf(p, 0) only checks at
// the first index. See: http://stackoverflow.com/a/4579228
return s.lastIndexOf(prefix, 0) === 0;
}
/** Maximum length of logMessageArray. */
var kMaxLogMessageLength = 20;
/** An array of messages to display in the element with id "log". */
var logMessageArray = [];
/**
* Add a message to an element with id "log".
*
* This function is used by the default "log:" message handler.
*
* @param {string} message The message to log.
*/
function logMessage(message) {
logMessageArray.push(message);
if (logMessageArray.length > kMaxLogMessageLength)
logMessageArray.shift();
document.getElementById('log').textContent = logMessageArray.join('\n');
console.log(message);
}
/**
*/
var defaultMessageTypes = {
'alert': alert,
'log': logMessage
};
/**
* Called when the NaCl module sends a message to JavaScript (via
* PPB_Messaging.PostMessage())
*
* This event listener is registered in createNaClModule above.
*
* @param {Event} message_event A message event. message_event.data contains
* the data sent from the NaCl module.
*/
function handleMessage(message_event) {
if (typeof message_event.data === 'string') {
for (var type in defaultMessageTypes) {
if (defaultMessageTypes.hasOwnProperty(type)) {
if (startsWith(message_event.data, type + ':')) {
func = defaultMessageTypes[type];
func(message_event.data.slice(type.length + 1));
return;
}
}
}
}
if (typeof window.handleMessage !== 'undefined') {
window.handleMessage(message_event);
return;
}
logMessage('Unhandled message: ' + message_event.data);
}
/**
* Called when the DOM content has loaded; i.e. the page's document is fully
* parsed. At this point, we can safely query any elements in the document via
* document.querySelector, document.getElementById, etc.
*
* @param {string} name The name of the example.
* @param {string} tool The name of the toolchain, e.g. "glibc", "newlib" etc.
* @param {string} path Directory name where .nmf file can be found.
* @param {number} width The width to create the plugin.
* @param {number} height The height to create the plugin.
* @param {Object} attrs Optional dictionary of additional attributes.
*/
function domContentLoaded(name, tool, path, width, height, attrs) {
// If the page loads before the Native Client module loads, then set the
// status message indicating that the module is still loading. Otherwise,
// do not change the status message.
updateStatus('Page loaded.');
if (!browserSupportsNaCl(tool)) {
updateStatus(
'Browser does not support NaCl (' + tool + '), or NaCl is disabled');
} else if (common.naclModule == null) {
updateStatus('Creating embed: ' + tool);
// We use a non-zero sized embed to give Chrome space to place the bad
// plug-in graphic, if there is a problem.
width = typeof width !== 'undefined' ? width : 200;
height = typeof height !== 'undefined' ? height : 200;
attachDefaultListeners();
createNaClModule(name, tool, path, width, height, attrs);
} else {
// It's possible that the Native Client module onload event fired
// before the page's onload event. In this case, the status message
// will reflect 'SUCCESS', but won't be displayed. This call will
// display the current message.
updateStatus('Waiting.');
}
}
/** Saved text to display in the element with id 'statusField'. */
var statusText = 'NO-STATUSES';
/**
* Set the global status message. If the element with id 'statusField'
* exists, then set its HTML to the status message as well.
*
* @param {string} opt_message The message to set. If null or undefined, then
* set element 'statusField' to the message from the last call to
* updateStatus.
*/
function updateStatus(opt_message) {
if (opt_message) {
statusText = opt_message;
}
var statusField = document.getElementById('statusField');
if (statusField) {
statusField.innerHTML = statusText;
}
}
// The symbols to export.
return {
/** A reference to the NaCl module, once it is loaded. */
naclModule: null,
attachDefaultListeners: attachDefaultListeners,
domContentLoaded: domContentLoaded,
createNaClModule: createNaClModule,
hideModule: hideModule,
removeModule: removeModule,
logMessage: logMessage,
updateStatus: updateStatus
};
}());
// Listen for the DOM content to be loaded. This event is fired when parsing of
// the page's document has finished.
document.addEventListener('DOMContentLoaded', function() {
var body = document.body;
// The data-* attributes on the body can be referenced via body.dataset.
if (body.dataset) {
var loadFunction;
if (!body.dataset.customLoad) {
loadFunction = common.domContentLoaded;
} else if (typeof window.domContentLoaded !== 'undefined') {
loadFunction = window.domContentLoaded;
}
// From https://developer.mozilla.org/en-US/docs/DOM/window.location
var searchVars = {};
if (window.location.search.length > 1) {
var pairs = window.location.search.substr(1).split('&');
for (var key_ix = 0; key_ix < pairs.length; key_ix++) {
var keyValue = pairs[key_ix].split('=');
searchVars[unescape(keyValue[0])] =
keyValue.length > 1 ? unescape(keyValue[1]) : '';
}
}
if (loadFunction) {
var toolchains = body.dataset.tools.split(' ');
var configs = body.dataset.configs.split(' ');
var attrs = {};
if (body.dataset.attrs) {
var attr_list = body.dataset.attrs.split(' ');
for (var key in attr_list) {
var attr = attr_list[key].split('=');
var key = attr[0];
var value = attr[1];
attrs[key] = value;
}
}
var tc = toolchains.indexOf(searchVars.tc) !== -1 ?
searchVars.tc : toolchains[0];
// If the config value is included in the search vars, use that.
// Otherwise default to Release if it is valid, or the first value if
// Release is not valid.
if (configs.indexOf(searchVars.config) !== -1)
var config = searchVars.config;
else if (configs.indexOf('Release') !== -1)
var config = 'Release';
else
var config = configs[0];
var pathFormat = body.dataset.path;
var path = pathFormat.replace('{tc}', tc).replace('{config}', config);
isTest = searchVars.test === 'true';
isRelease = path.toLowerCase().indexOf('release') != -1;
loadFunction(body.dataset.name, tc, path, body.dataset.width,
body.dataset.height, attrs);
}
}
});
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