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Developer Documentation
- Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
- Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
- PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
/lib/ -> outputrequirementslib.php (source)
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Library functions to facilitate the use of JavaScript in Moodle.
*
* Note: you can find history of this file in lib/ajax/ajaxlib.php
*
* @copyright 2009 Tim Hunt, 2010 Petr Skoda
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @package core
* @category output
*/
defined('MOODLE_INTERNAL') || die();
/**
* This class tracks all the things that are needed by the current page.
*
* Normally, the only instance of this class you will need to work with is the
* one accessible via $PAGE->requires.
*
* Typical usage would be
* <pre>
* $PAGE->requires->js_call_amd('mod_forum/view', 'init');
* </pre>
*
* It also supports obsoleted coding style with/without YUI3 modules.
* <pre>
* $PAGE->requires->js_init_call('M.mod_forum.init_view');
* $PAGE->requires->css('/mod/mymod/userstyles.php?id='.$id); // not overridable via themes!
* $PAGE->requires->js('/mod/mymod/script.js');
* $PAGE->requires->js('/mod/mymod/small_but_urgent.js', true);
* $PAGE->requires->js_function_call('init_mymod', array($data), true);
* </pre>
*
* There are some natural restrictions on some methods. For example, {@link css()}
* can only be called before the <head> tag is output. See the comments on the
* individual methods for details.
*
* @copyright 2009 Tim Hunt, 2010 Petr Skoda
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.0
* @package core
* @category output
*/
class page_requirements_manager {
/**
* @var array List of string available from JS
*/
protected $stringsforjs = array();
/**
* @var array List of get_string $a parameters - used for validation only.
*/
protected $stringsforjs_as = array();
/**
* @var array List of JS variables to be initialised
*/
protected $jsinitvariables = array('head'=>array(), 'footer'=>array());
/**
* @var array Included JS scripts
*/
protected $jsincludes = array('head'=>array(), 'footer'=>array());
/**
* @var array Inline scripts using RequireJS module loading.
*/
protected $amdjscode = array('');
/**
* @var array List of needed function calls
*/
protected $jscalls = array('normal'=>array(), 'ondomready'=>array());
/**
* @var array List of skip links, those are needed for accessibility reasons
*/
protected $skiplinks = array();
/**
* @var array Javascript code used for initialisation of page, it should
* be relatively small
*/
protected $jsinitcode = array();
/**
* @var array of moodle_url Theme sheets, initialised only from core_renderer
*/
protected $cssthemeurls = array();
/**
* @var array of moodle_url List of custom theme sheets, these are strongly discouraged!
* Useful mostly only for CSS submitted by teachers that is not part of the theme.
*/
protected $cssurls = array();
/**
* @var array List of requested event handlers
*/
protected $eventhandlers = array();
/**
* @var array Extra modules
*/
protected $extramodules = array();
/**
* @var array trackes the names of bits of HTML that are only required once
* per page. See {@link has_one_time_item_been_created()},
* {@link set_one_time_item_created()} and {@link should_create_one_time_item_now()}.
*/
protected $onetimeitemsoutput = array();
/**
* @var bool Flag indicated head stuff already printed
*/
protected $headdone = false;
/**
* @var bool Flag indicating top of body already printed
*/
protected $topofbodydone = false;
/**
* @var stdClass YUI PHPLoader instance responsible for YUI3 loading from PHP only
*/
protected $yui3loader;
/**
* @var YUI_config default YUI loader configuration
*/
protected $YUI_config;
/**
* @var array $yuicssmodules
*/
protected $yuicssmodules = array();
/**
* @var array Some config vars exposed in JS, please no secret stuff there
*/
protected $M_cfg;
/**
* @var array list of requested jQuery plugins
*/
protected $jqueryplugins = array();
/**
* @var array list of jQuery plugin overrides
*/
protected $jquerypluginoverrides = array();
/**
* Page requirements constructor.
*/
public function __construct() {
global $CFG;
// You may need to set up URL rewrite rule because oversized URLs might not be allowed by web server.
$sep = empty($CFG->yuislasharguments) ? '?' : '/';
$this->yui3loader = new stdClass();
$this->YUI_config = new YUI_config();
< if (is_https() && !empty($CFG->useexternalyui)) {
< // On HTTPS sites all JS must be loaded from https sites,
< // YUI CDN does not support https yet, sorry.
< $CFG->useexternalyui = 0;
< }
<
// Set up some loader options.
$this->yui3loader->local_base = $CFG->wwwroot . '/lib/yuilib/'. $CFG->yui3version . '/';
$this->yui3loader->local_comboBase = $CFG->wwwroot . '/theme/yui_combo.php'.$sep;
< if (!empty($CFG->useexternalyui)) {
< $this->yui3loader->base = 'http://yui.yahooapis.com/' . $CFG->yui3version . '/';
< $this->yui3loader->comboBase = 'http://yui.yahooapis.com/combo?';
< } else {
$this->yui3loader->base = $this->yui3loader->local_base;
$this->yui3loader->comboBase = $this->yui3loader->local_comboBase;
< }
// Enable combo loader? This significantly helps with caching and performance!
$this->yui3loader->combine = !empty($CFG->yuicomboloading);
$jsrev = $this->get_jsrev();
// Set up JS YUI loader helper object.
$this->YUI_config->base = $this->yui3loader->base;
$this->YUI_config->comboBase = $this->yui3loader->comboBase;
$this->YUI_config->combine = $this->yui3loader->combine;
// If we've had to patch any YUI modules between releases, we must override the YUI configuration to include them.
if (!empty($CFG->yuipatchedmodules) && !empty($CFG->yuipatchlevel)) {
$this->YUI_config->define_patched_core_modules($this->yui3loader->local_comboBase,
$CFG->yui3version,
$CFG->yuipatchlevel,
$CFG->yuipatchedmodules);
}
$configname = $this->YUI_config->set_config_source('lib/yui/config/yui2.js');
$this->YUI_config->add_group('yui2', array(
< // Loader configuration for our 2in3, for now ignores $CFG->useexternalyui.
> // Loader configuration for our 2in3.
'base' => $CFG->wwwroot . '/lib/yuilib/2in3/' . $CFG->yui2version . '/build/',
'comboBase' => $CFG->wwwroot . '/theme/yui_combo.php'.$sep,
'combine' => $this->yui3loader->combine,
'ext' => false,
'root' => '2in3/' . $CFG->yui2version .'/build/',
'patterns' => array(
'yui2-' => array(
'group' => 'yui2',
'configFn' => $configname,
)
)
));
$configname = $this->YUI_config->set_config_source('lib/yui/config/moodle.js');
$this->YUI_config->add_group('moodle', array(
'name' => 'moodle',
'base' => $CFG->wwwroot . '/theme/yui_combo.php' . $sep . 'm/' . $jsrev . '/',
'combine' => $this->yui3loader->combine,
'comboBase' => $CFG->wwwroot . '/theme/yui_combo.php'.$sep,
'ext' => false,
'root' => 'm/'.$jsrev.'/', // Add the rev to the root path so that we can control caching.
'patterns' => array(
'moodle-' => array(
'group' => 'moodle',
'configFn' => $configname,
)
)
));
$this->YUI_config->add_group('gallery', array(
'name' => 'gallery',
'base' => $CFG->wwwroot . '/lib/yuilib/gallery/',
'combine' => $this->yui3loader->combine,
'comboBase' => $CFG->wwwroot . '/theme/yui_combo.php' . $sep,
'ext' => false,
'root' => 'gallery/' . $jsrev . '/',
'patterns' => array(
'gallery-' => array(
'group' => 'gallery',
)
)
));
// Set some more loader options applying to groups too.
if ($CFG->debugdeveloper) {
// When debugging is enabled, we want to load the non-minified (RAW) versions of YUI library modules rather
// than the DEBUG versions as these generally generate too much logging for our purposes.
// However we do want the DEBUG versions of our Moodle-specific modules.
// To debug a YUI-specific issue, change the yui3loader->filter value to DEBUG.
$this->YUI_config->filter = 'RAW';
$this->YUI_config->groups['moodle']['filter'] = 'DEBUG';
// We use the yui3loader->filter setting when writing the YUI3 seed scripts into the header.
$this->yui3loader->filter = $this->YUI_config->filter;
$this->YUI_config->debug = true;
} else {
$this->yui3loader->filter = null;
$this->YUI_config->groups['moodle']['filter'] = null;
$this->YUI_config->debug = false;
}
// Include the YUI config log filters.
if (!empty($CFG->yuilogexclude) && is_array($CFG->yuilogexclude)) {
$this->YUI_config->logExclude = $CFG->yuilogexclude;
}
if (!empty($CFG->yuiloginclude) && is_array($CFG->yuiloginclude)) {
$this->YUI_config->logInclude = $CFG->yuiloginclude;
}
if (!empty($CFG->yuiloglevel)) {
$this->YUI_config->logLevel = $CFG->yuiloglevel;
}
// Add the moodle group's module data.
$this->YUI_config->add_moodle_metadata();
// Every page should include definition of following modules.
$this->js_module($this->find_module('core_filepicker'));
$this->js_module($this->find_module('core_comment'));
}
/**
* Return the safe config values that get set for javascript in "M.cfg".
*
* @since 2.9
* @return array List of safe config values that are available to javascript.
*/
public function get_config_for_javascript(moodle_page $page, renderer_base $renderer) {
global $CFG;
if (empty($this->M_cfg)) {
$iconsystem = \core\output\icon_system::instance();
// It is possible that the $page->context is null, so we can't use $page->context->id.
$contextid = null;
$contextinstanceid = null;
if (!is_null($page->context)) {
$contextid = $page->context->id;
$contextinstanceid = $page->context->instanceid;
$courseid = $page->course->id;
$coursecontext = context_course::instance($courseid);
}
$this->M_cfg = array(
'wwwroot' => $CFG->wwwroot,
'homeurl' => $page->navigation->action,
'sesskey' => sesskey(),
'sessiontimeout' => $CFG->sessiontimeout,
'sessiontimeoutwarning' => $CFG->sessiontimeoutwarning,
'themerev' => theme_get_revision(),
'slasharguments' => (int)(!empty($CFG->slasharguments)),
'theme' => $page->theme->name,
'iconsystemmodule' => $iconsystem->get_amd_name(),
'jsrev' => $this->get_jsrev(),
'admin' => $CFG->admin,
'svgicons' => $page->theme->use_svg_icons(),
'usertimezone' => usertimezone(),
'courseId' => isset($courseid) ? (int) $courseid : 0,
'courseContextId' => isset($coursecontext) ? $coursecontext->id : 0,
'contextid' => $contextid,
'contextInstanceId' => (int) $contextinstanceid,
'langrev' => get_string_manager()->get_revision(),
'templaterev' => $this->get_templaterev()
);
if ($CFG->debugdeveloper) {
$this->M_cfg['developerdebug'] = true;
}
if (defined('BEHAT_SITE_RUNNING')) {
$this->M_cfg['behatsiterunning'] = true;
}
}
return $this->M_cfg;
}
/**
* Initialise with the bits of JavaScript that every Moodle page should have.
*
* @param moodle_page $page
* @param core_renderer $renderer
*/
protected function init_requirements_data(moodle_page $page, core_renderer $renderer) {
global $CFG;
// Init the js config.
$this->get_config_for_javascript($page, $renderer);
// Accessibility stuff.
$this->skip_link_to('maincontent', get_string('tocontent', 'access'));
// Add strings used on many pages.
$this->string_for_js('confirmation', 'admin');
$this->string_for_js('cancel', 'moodle');
$this->string_for_js('yes', 'moodle');
// Alter links in top frame to break out of frames.
if ($page->pagelayout === 'frametop') {
$this->js_init_call('M.util.init_frametop');
}
// Include block drag/drop if editing is on
if ($page->user_is_editing()) {
$params = array(
< 'courseid' => $page->course->id,
< 'pagetype' => $page->pagetype,
< 'pagelayout' => $page->pagelayout,
< 'subpage' => $page->subpage,
'regions' => $page->blocks->get_regions(),
< 'contextid' => $page->context->id,
> 'pagehash' => $page->get_edited_page_hash(),
);
if (!empty($page->cm->id)) {
$params['cmid'] = $page->cm->id;
}
// Strings for drag and drop.
$this->strings_for_js(array('movecontent',
'tocontent',
'emptydragdropregion'),
'moodle');
$page->requires->yui_module('moodle-core-blocks', 'M.core_blocks.init_dragdrop', array($params), null, true);
> $page->requires->js_call_amd('core_block/edit', 'init', ['pagehash' => $page->get_edited_page_hash()]);
}
// Include the YUI CSS Modules.
$page->requires->set_yuicssmodules($page->theme->yuicssmodules);
}
/**
* Determine the correct JS Revision to use for this load.
*
* @return int the jsrev to use.
*/
public function get_jsrev() {
global $CFG;
if (empty($CFG->cachejs)) {
$jsrev = -1;
} else if (empty($CFG->jsrev)) {
$jsrev = 1;
} else {
$jsrev = $CFG->jsrev;
}
return $jsrev;
}
/**
* Determine the correct Template revision to use for this load.
*
* @return int the templaterev to use.
*/
protected function get_templaterev() {
global $CFG;
if (empty($CFG->cachetemplates)) {
$templaterev = -1;
} else if (empty($CFG->templaterev)) {
$templaterev = 1;
} else {
$templaterev = $CFG->templaterev;
}
return $templaterev;
}
/**
* Ensure that the specified JavaScript file is linked to from this page.
*
* NOTE: This function is to be used in RARE CASES ONLY, please store your JS in module.js file
* and use $PAGE->requires->js_init_call() instead or use /yui/ subdirectories for YUI modules.
*
* By default the link is put at the end of the page, since this gives best page-load performance.
*
* Even if a particular script is requested more than once, it will only be linked
* to once.
*
* @param string|moodle_url $url The path to the .js file, relative to $CFG->dirroot / $CFG->wwwroot.
* For example '/mod/mymod/customscripts.js'; use moodle_url for external scripts
* @param bool $inhead initialise in head
*/
public function js($url, $inhead = false) {
> if ($url == '/question/qengine.js') {
$url = $this->js_fix_url($url);
> debugging('The question/qengine.js has been deprecated. ' .
$where = $inhead ? 'head' : 'footer';
> 'Please use core_question/question_engine', DEBUG_DEVELOPER);
$this->jsincludes[$where][$url->out()] = $url;
> }
}
/**
* Request inclusion of jQuery library in the page.
*
* NOTE: this should not be used in official Moodle distribution!
*
* {@link https://moodledev.io/docs/guides/javascript/jquery}
*/
public function jquery() {
$this->jquery_plugin('jquery');
}
/**
* Request inclusion of jQuery plugin.
*
* NOTE: this should not be used in official Moodle distribution!
*
* jQuery plugins are located in plugin/jquery/* subdirectory,
* plugin/jquery/plugins.php lists all available plugins.
*
* Included core plugins:
* - jQuery UI
*
* Add-ons may include extra jQuery plugins in jquery/ directory,
* plugins.php file defines the mapping between plugin names and
* necessary page includes.
*
* Examples:
* <code>
* // file: mod/xxx/view.php
* $PAGE->requires->jquery();
* $PAGE->requires->jquery_plugin('ui');
* $PAGE->requires->jquery_plugin('ui-css');
* </code>
*
* <code>
* // file: theme/yyy/lib.php
* function theme_yyy_page_init(moodle_page $page) {
* $page->requires->jquery();
* $page->requires->jquery_plugin('ui');
* $page->requires->jquery_plugin('ui-css');
* }
* </code>
*
* <code>
* // file: blocks/zzz/block_zzz.php
* public function get_required_javascript() {
* parent::get_required_javascript();
* $this->page->requires->jquery();
* $page->requires->jquery_plugin('ui');
* $page->requires->jquery_plugin('ui-css');
* }
* </code>
*
* {@link https://moodledev.io/docs/guides/javascript/jquery}
*
* @param string $plugin name of the jQuery plugin as defined in jquery/plugins.php
* @param string $component name of the component
* @return bool success
*/
public function jquery_plugin($plugin, $component = 'core') {
global $CFG;
if ($this->headdone) {
debugging('Can not add jQuery plugins after starting page output!');
return false;
}
if ($component !== 'core' and in_array($plugin, array('jquery', 'ui', 'ui-css'))) {
debugging("jQuery plugin '$plugin' is included in Moodle core, other components can not use the same name.", DEBUG_DEVELOPER);
$component = 'core';
} else if ($component !== 'core' and strpos($component, '_') === false) {
// Let's normalise the legacy activity names, Frankenstyle rulez!
$component = 'mod_' . $component;
}
if (empty($this->jqueryplugins) and ($component !== 'core' or $plugin !== 'jquery')) {
// Make sure the jQuery itself is always loaded first,
// the order of all other plugins depends on order of $PAGE_>requires->.
$this->jquery_plugin('jquery', 'core');
}
if (isset($this->jqueryplugins[$plugin])) {
// No problem, we already have something, first Moodle plugin to register the jQuery plugin wins.
return true;
}
$componentdir = core_component::get_component_directory($component);
if (!file_exists($componentdir) or !file_exists("$componentdir/jquery/plugins.php")) {
debugging("Can not load jQuery plugin '$plugin', missing plugins.php in component '$component'.", DEBUG_DEVELOPER);
return false;
}
$plugins = array();
require("$componentdir/jquery/plugins.php");
if (!isset($plugins[$plugin])) {
debugging("jQuery plugin '$plugin' can not be found in component '$component'.", DEBUG_DEVELOPER);
return false;
}
$this->jqueryplugins[$plugin] = new stdClass();
$this->jqueryplugins[$plugin]->plugin = $plugin;
$this->jqueryplugins[$plugin]->component = $component;
$this->jqueryplugins[$plugin]->urls = array();
foreach ($plugins[$plugin]['files'] as $file) {
if ($CFG->debugdeveloper) {
if (!file_exists("$componentdir/jquery/$file")) {
debugging("Invalid file '$file' specified in jQuery plugin '$plugin' in component '$component'");
continue;
}
$file = str_replace('.min.css', '.css', $file);
$file = str_replace('.min.js', '.js', $file);
}
if (!file_exists("$componentdir/jquery/$file")) {
debugging("Invalid file '$file' specified in jQuery plugin '$plugin' in component '$component'");
continue;
}
if (!empty($CFG->slasharguments)) {
$url = new moodle_url("/theme/jquery.php");
$url->set_slashargument("/$component/$file");
} else {
// This is not really good, we need slasharguments for relative links, this means no caching...
$path = realpath("$componentdir/jquery/$file");
if (strpos($path, $CFG->dirroot) === 0) {
$url = $CFG->wwwroot.preg_replace('/^'.preg_quote($CFG->dirroot, '/').'/', '', $path);
// Replace all occurences of backslashes characters in url to forward slashes.
$url = str_replace('\\', '/', $url);
$url = new moodle_url($url);
} else {
// Bad luck, fix your server!
debugging("Moodle jQuery integration requires 'slasharguments' setting to be enabled.");
continue;
}
}
$this->jqueryplugins[$plugin]->urls[] = $url;
}
return true;
}
/**
* Request replacement of one jQuery plugin by another.
*
* This is useful when themes want to replace the jQuery UI theme,
* the problem is that theme can not prevent others from including the core ui-css plugin.
*
* Example:
* 1/ generate new jQuery UI theme and place it into theme/yourtheme/jquery/
* 2/ write theme/yourtheme/jquery/plugins.php
* 3/ init jQuery from theme
*
* <code>
* // file theme/yourtheme/lib.php
* function theme_yourtheme_page_init($page) {
* $page->requires->jquery_plugin('yourtheme-ui-css', 'theme_yourtheme');
* $page->requires->jquery_override_plugin('ui-css', 'yourtheme-ui-css');
* }
* </code>
*
* This code prevents loading of standard 'ui-css' which my be requested by other plugins,
* the 'yourtheme-ui-css' gets loaded only if some other code requires jquery.
*
* {@link https://moodledev.io/docs/guides/javascript/jquery}
*
* @param string $oldplugin original plugin
* @param string $newplugin the replacement
*/
public function jquery_override_plugin($oldplugin, $newplugin) {
if ($this->headdone) {
debugging('Can not override jQuery plugins after starting page output!');
return;
}
$this->jquerypluginoverrides[$oldplugin] = $newplugin;
}
/**
* Return jQuery related markup for page start.
* @return string
*/
protected function get_jquery_headcode() {
if (empty($this->jqueryplugins['jquery'])) {
// If nobody requested jQuery then do not bother to load anything.
// This may be useful for themes that want to override 'ui-css' only if requested by something else.
return '';
}
$included = array();
$urls = array();
foreach ($this->jqueryplugins as $name => $unused) {
if (isset($included[$name])) {
continue;
}
if (array_key_exists($name, $this->jquerypluginoverrides)) {
// The following loop tries to resolve the replacements,
// use max 100 iterations to prevent infinite loop resulting
// in blank page.
$cyclic = true;
$oldname = $name;
for ($i=0; $i<100; $i++) {
$name = $this->jquerypluginoverrides[$name];
if (!array_key_exists($name, $this->jquerypluginoverrides)) {
$cyclic = false;
break;
}
}
if ($cyclic) {
// We can not do much with cyclic references here, let's use the old plugin.
$name = $oldname;
debugging("Cyclic overrides detected for jQuery plugin '$name'");
} else if (empty($name)) {
// Developer requested removal of the plugin.
continue;
} else if (!isset($this->jqueryplugins[$name])) {
debugging("Unknown jQuery override plugin '$name' detected");
$name = $oldname;
} else if (isset($included[$name])) {
// The plugin was already included, easy.
continue;
}
}
$plugin = $this->jqueryplugins[$name];
$urls = array_merge($urls, $plugin->urls);
$included[$name] = true;
}
$output = '';
$attributes = array('rel' => 'stylesheet', 'type' => 'text/css');
foreach ($urls as $url) {
if (preg_match('/\.js$/', $url)) {
$output .= html_writer::script('', $url);
} else if (preg_match('/\.css$/', $url)) {
$attributes['href'] = $url;
$output .= html_writer::empty_tag('link', $attributes) . "\n";
}
}
return $output;
}
/**
< * Returns the actual url through which a script is served.
> * Returns the actual url through which a JavaScript file is served.
*
< * @param moodle_url|string $url full moodle url, or shortened path to script
> * @param moodle_url|string $url full moodle url, or shortened path to script.
> * @throws coding_exception if the given $url isn't a shortened url starting with / or a moodle_url instance.
* @return moodle_url
*/
protected function js_fix_url($url) {
global $CFG;
if ($url instanceof moodle_url) {
> // If the URL is external to Moodle, it won't be handled by Moodle (!).
return $url;
> if ($url->is_local_url()) {
} else if (null !== $url && strpos($url, '/') === 0) {
> $localurl = $url->out_as_local_url();
// Fix the admin links if needed.
> // Check if the URL points to a Moodle PHP resource.
if ($CFG->admin !== 'admin') {
> if (strpos($localurl, '.php') !== false) {
if (strpos($url, "/admin/") === 0) {
> // It's a Moodle PHP resource e.g. a resource already served by the proper Moodle Handler.
$url = preg_replace("|^/admin/|", "/$CFG->admin/", $url);
> return $url;
}
> }
}
> // It's a local resource: we need to further examine it.
if (debugging()) {
> return $this->js_fix_url($url->out_as_local_url(false));
// Check file existence only when in debug mode.
> }
if (!file_exists($CFG->dirroot . strtok($url, '?'))) {
> // The URL is not a Moodle resource.
throw new coding_exception('Attempt to require a JavaScript file that does not exist.', $url);
}
}
if (substr($url, -3) === '.js') {
$jsrev = $this->get_jsrev();
if (empty($CFG->slasharguments)) {
< return new moodle_url('/lib/javascript.php', array('rev'=>$jsrev, 'jsfile'=>$url));
> return new moodle_url('/lib/javascript.php', ['rev' => $jsrev, 'jsfile' => $url]);
} else {
$returnurl = new moodle_url('/lib/javascript.php');
$returnurl->set_slashargument('/'.$jsrev.$url);
return $returnurl;
}
} else {
return new moodle_url($url);
}
} else {
throw new coding_exception('Invalid JS url, it has to be shortened url starting with / or moodle_url instance.', $url);
}
}
/**
* Find out if JS module present and return details.
*
* @param string $component name of component in frankenstyle, ex: core_group, mod_forum
* @return array description of module or null if not found
*/
protected function find_module($component) {
global $CFG, $PAGE;
$module = null;
if (strpos($component, 'core_') === 0) {
// Must be some core stuff - list here is not complete, this is just the stuff used from multiple places
// so that we do nto have to repeat the definition of these modules over and over again.
switch($component) {
case 'core_filepicker':
$module = array('name' => 'core_filepicker',
'fullpath' => '/repository/filepicker.js',
'requires' => array(
'base', 'node', 'node-event-simulate', 'json', 'async-queue', 'io-base', 'io-upload-iframe', 'io-form',
'yui2-treeview', 'panel', 'cookie', 'datatable', 'datatable-sort', 'resize-plugin', 'dd-plugin',
'escape', 'moodle-core_filepicker', 'moodle-core-notification-dialogue'
),
'strings' => array(array('lastmodified', 'moodle'), array('name', 'moodle'), array('type', 'repository'), array('size', 'repository'),
array('invalidjson', 'repository'), array('error', 'moodle'), array('info', 'moodle'),
array('nofilesattached', 'repository'), array('filepicker', 'repository'), array('logout', 'repository'),
array('nofilesavailable', 'repository'), array('norepositoriesavailable', 'repository'),
array('fileexistsdialogheader', 'repository'), array('fileexistsdialog_editor', 'repository'),
array('fileexistsdialog_filemanager', 'repository'), array('renameto', 'repository'),
array('referencesexist', 'repository'), array('select', 'repository')
));
break;
case 'core_comment':
$module = array('name' => 'core_comment',
'fullpath' => '/comment/comment.js',
'requires' => array('base', 'io-base', 'node', 'json', 'yui2-animation', 'overlay', 'escape'),
'strings' => array(array('confirmdeletecomments', 'admin'), array('yes', 'moodle'), array('no', 'moodle'))
);
break;
case 'core_role':
$module = array('name' => 'core_role',
'fullpath' => '/admin/roles/module.js',
'requires' => array('node', 'cookie'));
break;
case 'core_completion':
break;
case 'core_message':
$module = array('name' => 'core_message',
'requires' => array('base', 'node', 'event', 'node-event-simulate'),
'fullpath' => '/message/module.js');
break;
case 'core_group':
$module = array('name' => 'core_group',
'fullpath' => '/group/module.js',
'requires' => array('node', 'overlay', 'event-mouseenter'));
break;
case 'core_question_engine':
$module = array('name' => 'core_question_engine',
'fullpath' => '/question/qengine.js',
'requires' => array('node', 'event'));
break;
case 'core_rating':
$module = array('name' => 'core_rating',
'fullpath' => '/rating/module.js',
'requires' => array('node', 'event', 'overlay', 'io-base', 'json'));
break;
case 'core_dndupload':
$module = array('name' => 'core_dndupload',
'fullpath' => '/lib/form/dndupload.js',
'requires' => array('node', 'event', 'json', 'core_filepicker'),
'strings' => array(array('uploadformlimit', 'moodle'), array('droptoupload', 'moodle'), array('maxfilesreached', 'moodle'),
array('dndenabled_inbox', 'moodle'), array('fileexists', 'moodle'), array('maxbytesfile', 'error'),
array('sizegb', 'moodle'), array('sizemb', 'moodle'), array('sizekb', 'moodle'), array('sizeb', 'moodle'),
array('maxareabytesreached', 'moodle'), array('serverconnection', 'error'),
array('changesmadereallygoaway', 'moodle'), array('complete', 'moodle')
));
break;
}
} else {
if ($dir = core_component::get_component_directory($component)) {
if (file_exists("$dir/module.js")) {
if (strpos($dir, $CFG->dirroot.'/') === 0) {
$dir = substr($dir, strlen($CFG->dirroot));
$module = array('name'=>$component, 'fullpath'=>"$dir/module.js", 'requires' => array());
}
}
}
}
return $module;
}
/**
* Append YUI3 module to default YUI3 JS loader.
* The structure of module array is described at {@link http://developer.yahoo.com/yui/3/yui/}
*
* @param string|array $module name of module (details are autodetected), or full module specification as array
* @return void
*/
public function js_module($module) {
global $CFG;
if (empty($module)) {
throw new coding_exception('Missing YUI3 module name or full description.');
}
if (is_string($module)) {
$module = $this->find_module($module);
}
if (empty($module) or empty($module['name']) or empty($module['fullpath'])) {
throw new coding_exception('Missing YUI3 module details.');
}
$module['fullpath'] = $this->js_fix_url($module['fullpath'])->out(false);
// Add all needed strings.
if (!empty($module['strings'])) {
foreach ($module['strings'] as $string) {
$identifier = $string[0];
$component = isset($string[1]) ? $string[1] : 'moodle';
$a = isset($string[2]) ? $string[2] : null;
$this->string_for_js($identifier, $component, $a);
}
}
unset($module['strings']);
// Process module requirements and attempt to load each. This allows
// moodle modules to require each other.
if (!empty($module['requires'])){
foreach ($module['requires'] as $requirement) {
$rmodule = $this->find_module($requirement);
if (is_array($rmodule)) {
$this->js_module($rmodule);
}
}
}
if ($this->headdone) {
$this->extramodules[$module['name']] = $module;
} else {
$this->YUI_config->add_module_config($module['name'], $module);
}
}
/**
* Returns true if the module has already been loaded.
*
* @param string|array $module
* @return bool True if the module has already been loaded
*/
protected function js_module_loaded($module) {
if (is_string($module)) {
$modulename = $module;
} else {
$modulename = $module['name'];
}
return array_key_exists($modulename, $this->YUI_config->modules) ||
array_key_exists($modulename, $this->extramodules);
}
/**
* Ensure that the specified CSS file is linked to from this page.
*
* Because stylesheet links must go in the <head> part of the HTML, you must call
* this function before {@link get_head_code()} is called. That normally means before
* the call to print_header. If you call it when it is too late, an exception
* will be thrown.
*
* Even if a particular style sheet is requested more than once, it will only
* be linked to once.
*
* Please note use of this feature is strongly discouraged,
* it is suitable only for places where CSS is submitted directly by teachers.
* (Students must not be allowed to submit any external CSS because it may
* contain embedded javascript!). Example of correct use is mod/data.
*
* @param string $stylesheet The path to the .css file, relative to $CFG->wwwroot.
* For example:
* $PAGE->requires->css('mod/data/css.php?d='.$data->id);
*/
public function css($stylesheet) {
global $CFG;
if ($this->headdone) {
throw new coding_exception('Cannot require a CSS file after <head> has been printed.', $stylesheet);
}
if ($stylesheet instanceof moodle_url) {
// ok
} else if (strpos($stylesheet, '/') === 0) {
$stylesheet = new moodle_url($stylesheet);
} else {
throw new coding_exception('Invalid stylesheet parameter.', $stylesheet);
}
$this->cssurls[$stylesheet->out()] = $stylesheet;
}
/**
* Add theme stylesheet to page - do not use from plugin code,
* this should be called only from the core renderer!
*
* @param moodle_url $stylesheet
* @return void
*/
public function css_theme(moodle_url $stylesheet) {
$this->cssthemeurls[] = $stylesheet;
}
/**
* Ensure that a skip link to a given target is printed at the top of the <body>.
*
* You must call this function before {@link get_top_of_body_code()}, (if not, an exception
* will be thrown). That normally means you must call this before the call to print_header.
*
* If you ask for a particular skip link to be printed, it is then your responsibility
* to ensure that the appropriate <a name="..."> tag is printed in the body of the
* page, so that the skip link goes somewhere.
*
* Even if a particular skip link is requested more than once, only one copy of it will be output.
*
* @param string $target the name of anchor this link should go to. For example 'maincontent'.
* @param string $linktext The text to use for the skip link. Normally get_string('skipto', 'access', ...);
*/
public function skip_link_to($target, $linktext) {
if ($this->topofbodydone) {
debugging('Page header already printed, can not add skip links any more, code needs to be fixed.');
return;
}
$this->skiplinks[$target] = $linktext;
}
/**
* !!!DEPRECATED!!! please use js_init_call() if possible
* Ensure that the specified JavaScript function is called from an inline script
* somewhere on this page.
*
* By default the call will be put in a script tag at the
* end of the page after initialising Y instance, since this gives best page-load
* performance and allows you to use YUI3 library.
*
* If you request that a particular function is called several times, then
* that is what will happen (unlike linking to a CSS or JS file, where only
* one link will be output).
*
* The main benefit of the method is the automatic encoding of all function parameters.
*
* @deprecated
*
* @param string $function the name of the JavaScritp function to call. Can
* be a compound name like 'Y.Event.purgeElement'. Can also be
* used to create and object by using a 'function name' like 'new user_selector'.
* @param array $arguments and array of arguments to be passed to the function.
* When generating the function call, this will be escaped using json_encode,
* so passing objects and arrays should work.
* @param bool $ondomready If tru the function is only called when the dom is
* ready for manipulation.
* @param int $delay The delay before the function is called.
*/
public function js_function_call($function, array $arguments = null, $ondomready = false, $delay = 0) {
$where = $ondomready ? 'ondomready' : 'normal';
$this->jscalls[$where][] = array($function, $arguments, $delay);
}
/**
* This function appends a block of code to the AMD specific javascript block executed
* in the page footer, just after loading the requirejs library.
*
* The code passed here can rely on AMD module loading, e.g. require('jquery', function($) {...});
*
* @param string $code The JS code to append.
*/
public function js_amd_inline($code) {
$this->amdjscode[] = $code;
}
/**
* Load an AMD module and eventually call its method.
*
* This function creates a minimal inline JS snippet that requires an AMD module and eventually calls a single
* function from the module with given arguments. If it is called multiple times, it will be create multiple
* snippets.
*
* @param string $fullmodule The name of the AMD module to load, formatted as <component name>/<module name>.
* @param string $func Optional function from the module to call, defaults to just loading the AMD module.
* @param array $params The params to pass to the function (will be serialized into JSON).
*/
public function js_call_amd($fullmodule, $func = null, $params = array()) {
global $CFG;
$modulepath = explode('/', $fullmodule);
$modname = clean_param(array_shift($modulepath), PARAM_COMPONENT);
foreach ($modulepath as $module) {
$modname .= '/' . clean_param($module, PARAM_ALPHANUMEXT);
}
$functioncode = [];
if ($func !== null) {
$func = clean_param($func, PARAM_ALPHANUMEXT);
$jsonparams = array();
foreach ($params as $param) {
$jsonparams[] = json_encode($param);
}
$strparams = implode(', ', $jsonparams);
if ($CFG->debugdeveloper) {
$toomanyparamslimit = 1024;
if (strlen($strparams) > $toomanyparamslimit) {
debugging('Too much data passed as arguments to js_call_amd("' . $fullmodule . '", "' . $func .
'"). Generally there are better ways to pass lots of data from PHP to JavaScript, for example via Ajax, ' .
'data attributes, ... . This warning is triggered if the argument string becomes longer than ' .
$toomanyparamslimit . ' characters.', DEBUG_DEVELOPER);
}
}
$functioncode[] = "amd.{$func}({$strparams});";
}
$functioncode[] = "M.util.js_complete('{$modname}');";
$initcode = implode(' ', $functioncode);
$js = "M.util.js_pending('{$modname}'); require(['{$modname}'], function(amd) {{$initcode}});";
$this->js_amd_inline($js);
}
/**
* Creates a JavaScript function call that requires one or more modules to be loaded.
*
* This function can be used to include all of the standard YUI module types within JavaScript:
* - YUI3 modules [node, event, io]
* - YUI2 modules [yui2-*]
* - Moodle modules [moodle-*]
* - Gallery modules [gallery-*]
*
* Before writing new code that makes extensive use of YUI, you should consider it's replacement AMD/JQuery.
* @see js_call_amd()
*
* @param array|string $modules One or more modules
* @param string $function The function to call once modules have been loaded
* @param array $arguments An array of arguments to pass to the function
* @param string $galleryversion Deprecated: The gallery version to use
* @param bool $ondomready
*/
public function yui_module($modules, $function, array $arguments = null, $galleryversion = null, $ondomready = false) {
if (!is_array($modules)) {
$modules = array($modules);
}
if ($galleryversion != null) {
debugging('The galleryversion parameter to yui_module has been deprecated since Moodle 2.3.');
}
$jscode = 'Y.use('.join(',', array_map('json_encode', convert_to_array($modules))).',function() {'.js_writer::function_call($function, $arguments).'});';
if ($ondomready) {
$jscode = "Y.on('domready', function() { $jscode });";
}
$this->jsinitcode[] = $jscode;
}
/**
* Set the CSS Modules to be included from YUI.
*
* @param array $modules The list of YUI CSS Modules to include.
*/
public function set_yuicssmodules(array $modules = array()) {
$this->yuicssmodules = $modules;
}
/**
* Ensure that the specified JavaScript function is called from an inline script
* from page footer.
*
* @param string $function the name of the JavaScritp function to with init code,
* usually something like 'M.mod_mymodule.init'
* @param array $extraarguments and array of arguments to be passed to the function.
* The first argument is always the YUI3 Y instance with all required dependencies
* already loaded.
* @param bool $ondomready wait for dom ready (helps with some IE problems when modifying DOM)
* @param array $module JS module specification array
*/
public function js_init_call($function, array $extraarguments = null, $ondomready = false, array $module = null) {
$jscode = js_writer::function_call_with_Y($function, $extraarguments);
if (!$module) {
// Detect module automatically.
if (preg_match('/M\.([a-z0-9]+_[^\.]+)/', $function, $matches)) {
$module = $this->find_module($matches[1]);
}
}
$this->js_init_code($jscode, $ondomready, $module);
}
/**
* Add short static javascript code fragment to page footer.
* This is intended primarily for loading of js modules and initialising page layout.
* Ideally the JS code fragment should be stored in plugin renderer so that themes
* may override it.
*
* @param string $jscode
* @param bool $ondomready wait for dom ready (helps with some IE problems when modifying DOM)
* @param array $module JS module specification array
*/
public function js_init_code($jscode, $ondomready = false, array $module = null) {
$jscode = trim($jscode, " ;\n"). ';';
$uniqid = html_writer::random_id();
$startjs = " M.util.js_pending('" . $uniqid . "');";
$endjs = " M.util.js_complete('" . $uniqid . "');";
if ($module) {
$this->js_module($module);
$modulename = $module['name'];
$jscode = "$startjs Y.use('$modulename', function(Y) { $jscode $endjs });";
}
if ($ondomready) {
$jscode = "$startjs Y.on('domready', function() { $jscode $endjs });";
}
$this->jsinitcode[] = $jscode;
}
/**
* Make a language string available to JavaScript.
*
* All the strings will be available in a M.str object in the global namespace.
* So, for example, after a call to $PAGE->requires->string_for_js('course', 'moodle');
* then the JavaScript variable M.str.moodle.course will be 'Course', or the
* equivalent in the current language.
*
* The arguments to this function are just like the arguments to get_string
* except that $component is not optional, and there are some aspects to consider
* when the string contains {$a} placeholder.
*
* If the string does not contain any {$a} placeholder, you can simply use
* M.str.component.identifier to obtain it. If you prefer, you can call
* M.util.get_string(identifier, component) to get the same result.
*
* If you need to use {$a} placeholders, there are two options. Either the
* placeholder should be substituted in PHP on server side or it should
* be substituted in Javascript at client side.
*
* To substitute the placeholder at server side, just provide the required
* value for the placeholder when you require the string. Because each string
* is only stored once in the JavaScript (based on $identifier and $module)
* you cannot get the same string with two different values of $a. If you try,
* an exception will be thrown. Once the placeholder is substituted, you can
* use M.str or M.util.get_string() as shown above:
*
* // Require the string in PHP and replace the placeholder.
* $PAGE->requires->string_for_js('fullnamedisplay', 'moodle', $USER);
* // Use the result of the substitution in Javascript.
* alert(M.str.moodle.fullnamedisplay);
*
* To substitute the placeholder at client side, use M.util.get_string()
* function. It implements the same logic as {@link get_string()}:
*
* // Require the string in PHP but keep {$a} as it is.
* $PAGE->requires->string_for_js('fullnamedisplay', 'moodle');
* // Provide the values on the fly in Javascript.
* user = { firstname : 'Harry', lastname : 'Potter' }
* alert(M.util.get_string('fullnamedisplay', 'moodle', user);
*
* If you do need the same string expanded with different $a values in PHP
* on server side, then the solution is to put them in your own data structure
* (e.g. and array) that you pass to JavaScript with {@link data_for_js()}.
*
* @param string $identifier the desired string.
* @param string $component the language file to look in.
* @param mixed $a any extra data to add into the string (optional).
*/
public function string_for_js($identifier, $component, $a = null) {
if (!$component) {
throw new coding_exception('The $component parameter is required for page_requirements_manager::string_for_js().');
}
if (isset($this->stringsforjs_as[$component][$identifier]) and $this->stringsforjs_as[$component][$identifier] !== $a) {
throw new coding_exception("Attempt to re-define already required string '$identifier' " .
"from lang file '$component' with different \$a parameter?");
}
if (!isset($this->stringsforjs[$component][$identifier])) {
$this->stringsforjs[$component][$identifier] = new lang_string($identifier, $component, $a);
$this->stringsforjs_as[$component][$identifier] = $a;
}
}
/**
* Make an array of language strings available for JS.
*
* This function calls the above function {@link string_for_js()} for each requested
* string in the $identifiers array that is passed to the argument for a single module
* passed in $module.
*
* <code>
* $PAGE->requires->strings_for_js(array('one', 'two', 'three'), 'mymod', array('a', null, 3));
*
* // The above is identical to calling:
*
* $PAGE->requires->string_for_js('one', 'mymod', 'a');
* $PAGE->requires->string_for_js('two', 'mymod');
* $PAGE->requires->string_for_js('three', 'mymod', 3);
* </code>
*
* @param array $identifiers An array of desired strings
* @param string $component The module to load for
* @param mixed $a This can either be a single variable that gets passed as extra
* information for every string or it can be an array of mixed data where the
* key for the data matches that of the identifier it is meant for.
*
*/
public function strings_for_js($identifiers, $component, $a = null) {
foreach ($identifiers as $key => $identifier) {
if (is_array($a) && array_key_exists($key, $a)) {
$extra = $a[$key];
} else {
$extra = $a;
}
$this->string_for_js($identifier, $component, $extra);
}
}
/**
* !!!!!!DEPRECATED!!!!!! please use js_init_call() for everything now.
*
* Make some data from PHP available to JavaScript code.
*
* For example, if you call
* <pre>
* $PAGE->requires->data_for_js('mydata', array('name' => 'Moodle'));
* </pre>
* then in JavsScript mydata.name will be 'Moodle'.
*
* @deprecated
* @param string $variable the the name of the JavaScript variable to assign the data to.
* Will probably work if you use a compound name like 'mybuttons.button[1]', but this
* should be considered an experimental feature.
* @param mixed $data The data to pass to JavaScript. This will be escaped using json_encode,
* so passing objects and arrays should work.
* @param bool $inhead initialise in head
* @return void
*/
public function data_for_js($variable, $data, $inhead=false) {
$where = $inhead ? 'head' : 'footer';
$this->jsinitvariables[$where][] = array($variable, $data);
}
/**
* Creates a YUI event handler.
*
* @param mixed $selector standard YUI selector for elements, may be array or string, element id is in the form "#idvalue"
* @param string $event A valid DOM event (click, mousedown, change etc.)
* @param string $function The name of the function to call
* @param array $arguments An optional array of argument parameters to pass to the function
*/
public function event_handler($selector, $event, $function, array $arguments = null) {
$this->eventhandlers[] = array('selector'=>$selector, 'event'=>$event, 'function'=>$function, 'arguments'=>$arguments);
}
/**
* Returns code needed for registering of event handlers.
* @return string JS code
*/
protected function get_event_handler_code() {
$output = '';
foreach ($this->eventhandlers as $h) {
$output .= js_writer::event_handler($h['selector'], $h['event'], $h['function'], $h['arguments']);
}
return $output;
}
/**
* Get the inline JavaScript code that need to appear in a particular place.
* @param bool $ondomready
* @return string
*/
protected function get_javascript_code($ondomready) {
$where = $ondomready ? 'ondomready' : 'normal';
$output = '';
if ($this->jscalls[$where]) {
foreach ($this->jscalls[$where] as $data) {
$output .= js_writer::function_call($data[0], $data[1], $data[2]);
}
if (!empty($ondomready)) {
$output = " Y.on('domready', function() {\n$output\n});";
}
}
return $output;
}
/**
* Returns js code to be executed when Y is available.
* @return string
*/
protected function get_javascript_init_code() {
if (count($this->jsinitcode)) {
return implode("\n", $this->jsinitcode) . "\n";
}
return '';
}
/**
* Returns js code to load amd module loader, then insert inline script tags
* that contain require() calls using RequireJS.
* @return string
*/
protected function get_amd_footercode() {
global $CFG;
$output = '';
// We will cache JS if cachejs is not set, or it is true.
$cachejs = !isset($CFG->cachejs) || $CFG->cachejs;
$jsrev = $this->get_jsrev();
$jsloader = new moodle_url('/lib/javascript.php');
$jsloader->set_slashargument('/' . $jsrev . '/');
$requirejsloader = new moodle_url('/lib/requirejs.php');
$requirejsloader->set_slashargument('/' . $jsrev . '/');
$requirejsconfig = file_get_contents($CFG->dirroot . '/lib/requirejs/moodle-config.js');
// No extension required unless slash args is disabled.
$jsextension = '.js';
if (!empty($CFG->slasharguments)) {
$jsextension = '';
}
$minextension = '.min';
if (!$cachejs) {
$minextension = '';
}
$requirejsconfig = str_replace('[BASEURL]', $requirejsloader, $requirejsconfig);
$requirejsconfig = str_replace('[JSURL]', $jsloader, $requirejsconfig);
$requirejsconfig = str_replace('[JSMIN]', $minextension, $requirejsconfig);
$requirejsconfig = str_replace('[JSEXT]', $jsextension, $requirejsconfig);
$output .= html_writer::script($requirejsconfig);
if ($cachejs) {
$output .= html_writer::script('', $this->js_fix_url('/lib/requirejs/require.min.js'));
} else {
$output .= html_writer::script('', $this->js_fix_url('/lib/requirejs/require.js'));
}
// First include must be to a module with no dependencies, this prevents multiple requests.
$prefix = <<<EOF
M.util.js_pending("core/first");
require(['core/first'], function() {
EOF;
if (during_initial_install()) {
// Do not run a prefetch during initial install as the DB is not available to service WS calls.
$prefetch = '';
} else {
$prefetch = "require(['core/prefetch'])\n";
}
$suffix = <<<EOF
M.util.js_complete("core/first");
});
EOF;
$output .= html_writer::script($prefix . $prefetch . implode(";\n", $this->amdjscode) . $suffix);
return $output;
}
/**
* Returns basic YUI3 CSS code.
*
* @return string
*/
protected function get_yui3lib_headcss() {
global $CFG;
$yuiformat = '-min';
if ($this->yui3loader->filter === 'RAW') {
$yuiformat = '';
}
$code = '';
if ($this->yui3loader->combine) {
if (!empty($this->yuicssmodules)) {
$modules = array();
foreach ($this->yuicssmodules as $module) {
$modules[] = "$CFG->yui3version/$module/$module-min.css";
}
$code .= '<link rel="stylesheet" type="text/css" href="'.$this->yui3loader->comboBase.implode('&', $modules).'" />';
}
$code .= '<link rel="stylesheet" type="text/css" href="'.$this->yui3loader->local_comboBase.'rollup/'.$CFG->yui3version.'/yui-moodlesimple' . $yuiformat . '.css" />';
} else {
if (!empty($this->yuicssmodules)) {
foreach ($this->yuicssmodules as $module) {
$code .= '<link rel="stylesheet" type="text/css" href="'.$this->yui3loader->base.$module.'/'.$module.'-min.css" />';
}
}
$code .= '<link rel="stylesheet" type="text/css" href="'.$this->yui3loader->local_comboBase.'rollup/'.$CFG->yui3version.'/yui-moodlesimple' . $yuiformat . '.css" />';
}
if ($this->yui3loader->filter === 'RAW') {
$code = str_replace('-min.css', '.css', $code);
} else if ($this->yui3loader->filter === 'DEBUG') {
$code = str_replace('-min.css', '.css', $code);
}
return $code;
}
/**
* Returns basic YUI3 JS loading code.
*
* @return string
*/
protected function get_yui3lib_headcode() {
global $CFG;
$jsrev = $this->get_jsrev();
$yuiformat = '-min';
if ($this->yui3loader->filter === 'RAW') {
$yuiformat = '';
}
$format = '-min';
if ($this->YUI_config->groups['moodle']['filter'] === 'DEBUG') {
$format = '-debug';
}
$rollupversion = $CFG->yui3version;
if (!empty($CFG->yuipatchlevel)) {
$rollupversion .= '_' . $CFG->yuipatchlevel;
}
$baserollups = array(
'rollup/' . $rollupversion . "/yui-moodlesimple{$yuiformat}.js",
);
if ($this->yui3loader->combine) {
return '<script src="' .
$this->yui3loader->local_comboBase .
implode('&', $baserollups) .
'"></script>';
} else {
$code = '';
foreach ($baserollups as $rollup) {
$code .= '<script src="'.$this->yui3loader->local_comboBase.$rollup.'"></script>';
}
return $code;
}
}
/**
* Returns html tags needed for inclusion of theme CSS.
*
* @return string
*/
protected function get_css_code() {
// First of all the theme CSS, then any custom CSS
// Please note custom CSS is strongly discouraged,
// because it can not be overridden by themes!
// It is suitable only for things like mod/data which accepts CSS from teachers.
$attributes = array('rel'=>'stylesheet', 'type'=>'text/css');
// Add the YUI code first. We want this to be overridden by any Moodle CSS.
$code = $this->get_yui3lib_headcss();
// This line of code may look funny but it is currently required in order
// to avoid MASSIVE display issues in Internet Explorer.
// As of IE8 + YUI3.1.1 the reference stylesheet (firstthemesheet) gets
// ignored whenever another resource is added until such time as a redraw
// is forced, usually by moving the mouse over the affected element.
$code .= html_writer::tag('script', '/** Required in order to fix style inclusion problems in IE with YUI **/', array('id'=>'firstthemesheet', 'type'=>'text/css'));
$urls = $this->cssthemeurls + $this->cssurls;
foreach ($urls as $url) {
$attributes['href'] = $url;
$code .= html_writer::empty_tag('link', $attributes) . "\n";
// This id is needed in first sheet only so that theme may override YUI sheets loaded on the fly.
unset($attributes['id']);
}
return $code;
}
/**
* Adds extra modules specified after printing of page header.
*
* @return string
*/
protected function get_extra_modules_code() {
if (empty($this->extramodules)) {
return '';
}
return html_writer::script(js_writer::function_call('M.yui.add_module', array($this->extramodules)));
}
/**
* Generate any HTML that needs to go inside the <head> tag.
*
* Normally, this method is called automatically by the code that prints the
* <head> tag. You should not normally need to call it in your own code.
*
* @param moodle_page $page
* @param core_renderer $renderer
* @return string the HTML code to to inside the <head> tag.
*/
public function get_head_code(moodle_page $page, core_renderer $renderer) {
global $CFG;
// Note: the $page and $output are not stored here because it would
// create circular references in memory which prevents garbage collection.
$this->init_requirements_data($page, $renderer);
$output = '';
// Add all standard CSS for this page.
$output .= $this->get_css_code();
// Set up the M namespace.
$js = "var M = {}; M.yui = {};\n";
// Capture the time now ASAP during page load. This minimises the lag when
// we try to relate times on the server to times in the browser.
// An example of where this is used is the quiz countdown timer.
$js .= "M.pageloadstarttime = new Date();\n";
// Add a subset of Moodle configuration to the M namespace.
$js .= js_writer::set_variable('M.cfg', $this->M_cfg, false);
// Set up global YUI3 loader object - this should contain all code needed by plugins.
// Note: in JavaScript just use "YUI().use('overlay', function(Y) { .... });",
// this needs to be done before including any other script.
$js .= $this->YUI_config->get_config_functions();
$js .= js_writer::set_variable('YUI_config', $this->YUI_config, false) . "\n";
$js .= "M.yui.loader = {modules: {}};\n"; // Backwards compatibility only, not used any more.
$js = $this->YUI_config->update_header_js($js);
$output .= html_writer::script($js);
// Add variables.
if ($this->jsinitvariables['head']) {
$js = '';
foreach ($this->jsinitvariables['head'] as $data) {
list($var, $value) = $data;
$js .= js_writer::set_variable($var, $value, true);
}
$output .= html_writer::script($js);
}
// Mark head sending done, it is not possible to anything there.
$this->headdone = true;
return $output;
}
/**
* Generate any HTML that needs to go at the start of the <body> tag.
*
* Normally, this method is called automatically by the code that prints the
* <head> tag. You should not normally need to call it in your own code.
*
* @param renderer_base $renderer
* @return string the HTML code to go at the start of the <body> tag.
*/
public function get_top_of_body_code(renderer_base $renderer) {
global $CFG;
// First the skip links.
$output = $renderer->render_skip_links($this->skiplinks);
// Include the Polyfills.
$output .= html_writer::script('', $this->js_fix_url('/lib/polyfills/polyfill.js'));
// YUI3 JS needs to be loaded early in the body. It should be cached well by the browser.
$output .= $this->get_yui3lib_headcode();
// Add hacked jQuery support, it is not intended for standard Moodle distribution!
$output .= $this->get_jquery_headcode();
// Link our main JS file, all core stuff should be there.
$output .= html_writer::script('', $this->js_fix_url('/lib/javascript-static.js'));
// All the other linked things from HEAD - there should be as few as possible.
if ($this->jsincludes['head']) {
foreach ($this->jsincludes['head'] as $url) {
$output .= html_writer::script('', $url);
}
}
// Then the clever trick for hiding of things not needed when JS works.
$output .= html_writer::script("document.body.className += ' jsenabled';") . "\n";
$this->topofbodydone = true;
return $output;
}
/**
* Generate any HTML that needs to go at the end of the page.
*
* Normally, this method is called automatically by the code that prints the
* page footer. You should not normally need to call it in your own code.
*
* @return string the HTML code to to at the end of the page.
*/
public function get_end_code() {
global $CFG;
$output = '';
// Set the log level for the JS logging.
$logconfig = new stdClass();
$logconfig->level = 'warn';
if ($CFG->debugdeveloper) {
$logconfig->level = 'trace';
}
$this->js_call_amd('core/log', 'setConfig', array($logconfig));
// Add any global JS that needs to run on all pages.
$this->js_call_amd('core/page_global', 'init');
$this->js_call_amd('core/utility');
// Call amd init functions.
$output .= $this->get_amd_footercode();
// Add other requested modules.
$output .= $this->get_extra_modules_code();
$this->js_init_code('M.util.js_complete("init");', true);
// All the other linked scripts - there should be as few as possible.
if ($this->jsincludes['footer']) {
foreach ($this->jsincludes['footer'] as $url) {
$output .= html_writer::script('', $url);
}
}
// Add all needed strings.
// First add core strings required for some dialogues.
$this->strings_for_js(array(
'confirm',
'yes',
'no',
'areyousure',
'closebuttontitle',
'unknownerror',
'error',
'file',
'url',
// TODO MDL-70830 shortforms should preload the collapseall/expandall strings properly.
'collapseall',
'expandall',
), 'moodle');
$this->strings_for_js(array(
'debuginfo',
'line',
'stacktrace',
), 'debug');
$this->string_for_js('labelsep', 'langconfig');
if (!empty($this->stringsforjs)) {
$strings = array();
foreach ($this->stringsforjs as $component=>$v) {
foreach($v as $indentifier => $langstring) {
$strings[$component][$indentifier] = $langstring->out();
}
}
$output .= html_writer::script(js_writer::set_variable('M.str', $strings));
}
// Add variables.
if ($this->jsinitvariables['footer']) {
$js = '';
foreach ($this->jsinitvariables['footer'] as $data) {
list($var, $value) = $data;
$js .= js_writer::set_variable($var, $value, true);
}
$output .= html_writer::script($js);
}
$inyuijs = $this->get_javascript_code(false);
$ondomreadyjs = $this->get_javascript_code(true);
$jsinit = $this->get_javascript_init_code();
$handlersjs = $this->get_event_handler_code();
// There is a global Y, make sure it is available in your scope.
$js = "(function() {{$inyuijs}{$ondomreadyjs}{$jsinit}{$handlersjs}})();";
$output .= html_writer::script($js);
return $output;
}
/**
* Have we already output the code in the <head> tag?
*
* @return bool
*/
public function is_head_done() {
return $this->headdone;
}
/**
* Have we already output the code at the start of the <body> tag?
*
* @return bool
*/
public function is_top_of_body_done() {
return $this->topofbodydone;
}
/**
* Should we generate a bit of content HTML that is only required once on
* this page (e.g. the contents of the modchooser), now? Basically, we call
* {@link has_one_time_item_been_created()}, and if the thing has not already
* been output, we return true to tell the caller to generate it, and also
* call {@link set_one_time_item_created()} to record the fact that it is
* about to be generated.
*
* That is, a typical usage pattern (in a renderer method) is:
* <pre>
* if (!$this->page->requires->should_create_one_time_item_now($thing)) {
* return '';
* }
* // Else generate it.
* </pre>
*
* @param string $thing identifier for the bit of content. Should be of the form
* frankenstyle_things, e.g. core_course_modchooser.
* @return bool if true, the caller should generate that bit of output now, otherwise don't.
*/
public function should_create_one_time_item_now($thing) {
if ($this->has_one_time_item_been_created($thing)) {
return false;
}
$this->set_one_time_item_created($thing);
return true;
}
/**
* Has a particular bit of HTML that is only required once on this page
* (e.g. the contents of the modchooser) already been generated?
*
* Normally, you can use the {@link should_create_one_time_item_now()} helper
* method rather than calling this method directly.
*
* @param string $thing identifier for the bit of content. Should be of the form
* frankenstyle_things, e.g. core_course_modchooser.
* @return bool whether that bit of output has been created.
*/
public function has_one_time_item_been_created($thing) {
return isset($this->onetimeitemsoutput[$thing]);
}
/**
* Indicate that a particular bit of HTML that is only required once on this
* page (e.g. the contents of the modchooser) has been generated (or is about to be)?
*
* Normally, you can use the {@link should_create_one_time_item_now()} helper
* method rather than calling this method directly.
*
* @param string $thing identifier for the bit of content. Should be of the form
* frankenstyle_things, e.g. core_course_modchooser.
*/
public function set_one_time_item_created($thing) {
if ($this->has_one_time_item_been_created($thing)) {
throw new coding_exception($thing . ' is only supposed to be ouput ' .
'once per page, but it seems to be being output again.');
}
return $this->onetimeitemsoutput[$thing] = true;
}
}
/**
* This class represents the YUI configuration.
*
* @copyright 2013 Andrew Nicols
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
* @since Moodle 2.5
* @package core
* @category output
*/
class YUI_config {
/**
* These settings must be public so that when the object is converted to json they are exposed.
* Note: Some of these are camelCase because YUI uses camelCase variable names.
*
* The settings are described and documented in the YUI API at:
* - http://yuilibrary.com/yui/docs/api/classes/config.html
* - http://yuilibrary.com/yui/docs/api/classes/Loader.html
*/
public $debug = false;
public $base;
public $comboBase;
public $combine;
public $filter = null;
public $insertBefore = 'firstthemesheet';
public $groups = array();
public $modules = array();
> /** @var array The log sources that should be not be logged. */
> public $logInclude = [];
/**
> /** @var array Tog sources that should be logged. */
* @var array List of functions used by the YUI Loader group pattern recognition.
> public $logExclude = [];
*/
> /** @var string The minimum log level for YUI logging statements. */
protected $jsconfigfunctions = array();
> public $logLevel;
/**
* Create a new group within the YUI_config system.
*
* @param String $name The name of the group. This must be unique and
* not previously used.
* @param Array $config The configuration for this group.
* @return void
*/
public function add_group($name, $config) {
if (isset($this->groups[$name])) {
throw new coding_exception("A YUI configuration group for '{$name}' already exists. To make changes to this group use YUI_config->update_group().");
}
$this->groups[$name] = $config;
}
/**
* Update an existing group configuration
*
* Note, any existing configuration for that group will be wiped out.
* This includes module configuration.
*
* @param String $name The name of the group. This must be unique and
* not previously used.
* @param Array $config The configuration for this group.
* @return void
*/
public function update_group($name, $config) {
if (!isset($this->groups[$name])) {
throw new coding_exception('The Moodle YUI module does not exist. You must define the moodle module config using YUI_config->add_module_config first.');
}
$this->groups[$name] = $config;
}
/**
* Set the value of a configuration function used by the YUI Loader's pattern testing.
*
* Only the body of the function should be passed, and not the whole function wrapper.
*
* The JS function your write will be passed a single argument 'name' containing the
* name of the module being loaded.
*
* @param $function String the body of the JavaScript function. This should be used i
* @return String the name of the function to use in the group pattern configuration.
*/
public function set_config_function($function) {
$configname = 'yui' . (count($this->jsconfigfunctions) + 1) . 'ConfigFn';
if (isset($this->jsconfigfunctions[$configname])) {
throw new coding_exception("A YUI config function with this name already exists. Config function names must be unique.");
}
$this->jsconfigfunctions[$configname] = $function;
return '@' . $configname . '@';
}
/**
* Allow setting of the config function described in {@see set_config_function} from a file.
* The contents of this file are then passed to set_config_function.
*
* When jsrev is positive, the function is minified and stored in a MUC cache for subsequent uses.
*
* @param $file The path to the JavaScript function used for YUI configuration.
* @return String the name of the function to use in the group pattern configuration.
*/
public function set_config_source($file) {
global $CFG;
$cache = cache::make('core', 'yuimodules');
// Attempt to get the metadata from the cache.
$keyname = 'configfn_' . $file;
$fullpath = $CFG->dirroot . '/' . $file;
if (!isset($CFG->jsrev) || $CFG->jsrev == -1) {
$cache->delete($keyname);
$configfn = file_get_contents($fullpath);
} else {
$configfn = $cache->get($keyname);
if ($configfn === false) {
require_once($CFG->libdir . '/jslib.php');
$configfn = core_minify::js_files(array($fullpath));
$cache->set($keyname, $configfn);
}
}
return $this->set_config_function($configfn);
}
/**
* Retrieve the list of JavaScript functions for YUI_config groups.
*
* @return String The complete set of config functions
*/
public function get_config_functions() {
$configfunctions = '';
foreach ($this->jsconfigfunctions as $functionname => $function) {
$configfunctions .= "var {$functionname} = function(me) {";
$configfunctions .= $function;
$configfunctions .= "};\n";
}
return $configfunctions;
}
/**
* Update the header JavaScript with any required modification for the YUI Loader.
*
* @param $js String The JavaScript to manipulate.
* @return String the modified JS string.
*/
public function update_header_js($js) {
// Update the names of the the configFn variables.
// The PHP json_encode function cannot handle literal names so we have to wrap
// them in @ and then replace them with literals of the same function name.
foreach ($this->jsconfigfunctions as $functionname => $function) {
$js = str_replace('"@' . $functionname . '@"', $functionname, $js);
}
return $js;
}
/**
* Add configuration for a specific module.
*
* @param String $name The name of the module to add configuration for.
* @param Array $config The configuration for the specified module.
* @param String $group The name of the group to add configuration for.
* If not specified, then this module is added to the global
* configuration.
* @return void
*/
public function add_module_config($name, $config, $group = null) {
if ($group) {
if (!isset($this->groups[$name])) {
throw new coding_exception('The Moodle YUI module does not exist. You must define the moodle module config using YUI_config->add_module_config first.');
}
if (!isset($this->groups[$group]['modules'])) {
$this->groups[$group]['modules'] = array();
}
$modules = &$this->groups[$group]['modules'];
} else {
$modules = &$this->modules;
}
$modules[$name] = $config;
}
/**
* Add the moodle YUI module metadata for the moodle group to the YUI_config instance.
*
* If js caching is disabled, metadata will not be served causing YUI to calculate
* module dependencies as each module is loaded.
*
* If metadata does not exist it will be created and stored in a MUC entry.
*
* @return void
*/
public function add_moodle_metadata() {
global $CFG;
if (!isset($this->groups['moodle'])) {
throw new coding_exception('The Moodle YUI module does not exist. You must define the moodle module config using YUI_config->add_module_config first.');
}
if (!isset($this->groups['moodle']['modules'])) {
$this->groups['moodle']['modules'] = array();
}
$cache = cache::make('core', 'yuimodules');
if (!isset($CFG->jsrev) || $CFG->jsrev == -1) {
$metadata = array();
$metadata = $this->get_moodle_metadata();
$cache->delete('metadata');
} else {
// Attempt to get the metadata from the cache.
if (!$metadata = $cache->get('metadata')) {
$metadata = $this->get_moodle_metadata();
$cache->set('metadata', $metadata);
}
}
// Merge with any metadata added specific to this page which was added manually.
$this->groups['moodle']['modules'] = array_merge($this->groups['moodle']['modules'],
$metadata);
}
/**
* Determine the module metadata for all moodle YUI modules.
*
* This works through all modules capable of serving YUI modules, and attempts to get
* metadata for each of those modules.
*
* @return Array of module metadata
*/
private function get_moodle_metadata() {
$moodlemodules = array();
// Core isn't a plugin type or subsystem - handle it seperately.
if ($module = $this->get_moodle_path_metadata(core_component::get_component_directory('core'))) {
$moodlemodules = array_merge($moodlemodules, $module);
}
// Handle other core subsystems.
$subsystems = core_component::get_core_subsystems();
foreach ($subsystems as $subsystem => $path) {
if (is_null($path)) {
continue;
}
if ($module = $this->get_moodle_path_metadata($path)) {
$moodlemodules = array_merge($moodlemodules, $module);
}
}
// And finally the plugins.
$plugintypes = core_component::get_plugin_types();
foreach ($plugintypes as $plugintype => $pathroot) {
$pluginlist = core_component::get_plugin_list($plugintype);
foreach ($pluginlist as $plugin => $path) {
if ($module = $this->get_moodle_path_metadata($path)) {
$moodlemodules = array_merge($moodlemodules, $module);
}
}
}
return $moodlemodules;
}
/**
* Helper function process and return the YUI metadata for all of the modules under the specified path.
*
* @param String $path the UNC path to the YUI src directory.
* @return Array the complete array for frankenstyle directory.
*/
private function get_moodle_path_metadata($path) {
// Add module metadata is stored in frankenstyle_modname/yui/src/yui_modname/meta/yui_modname.json.
$baseyui = $path . '/yui/src';
$modules = array();
if (is_dir($baseyui)) {
$items = new DirectoryIterator($baseyui);
foreach ($items as $item) {
if ($item->isDot() or !$item->isDir()) {
continue;
}
$metafile = realpath($baseyui . '/' . $item . '/meta/' . $item . '.json');
if (!is_readable($metafile)) {
continue;
}
$metadata = file_get_contents($metafile);
$modules = array_merge($modules, (array) json_decode($metadata));
}
}
return $modules;
}
/**
* Define YUI modules which we have been required to patch between releases.
*
* We must do this because we aggressively cache content on the browser, and we must also override use of the
* external CDN which will serve the true authoritative copy of the code without our patches.
*
* @param String combobase The local combobase
* @param String yuiversion The current YUI version
* @param Int patchlevel The patch level we're working to for YUI
* @param Array patchedmodules An array containing the names of the patched modules
* @return void
*/
public function define_patched_core_modules($combobase, $yuiversion, $patchlevel, $patchedmodules) {
// The version we use is suffixed with a patchlevel so that we can get additional revisions between YUI releases.
$subversion = $yuiversion . '_' . $patchlevel;
if ($this->comboBase == $combobase) {
// If we are using the local combobase in the loader, we can add a group and still make use of the combo
// loader. We just need to specify a different root which includes a slightly different YUI version number
// to include our patchlevel.
$patterns = array();
$modules = array();
foreach ($patchedmodules as $modulename) {
// We must define the pattern and module here so that the loader uses our group configuration instead of
// the standard module definition. We may lose some metadata provided by upstream but this will be
// loaded when the module is loaded anyway.
$patterns[$modulename] = array(
'group' => 'yui-patched',
);
$modules[$modulename] = array();
}
// Actually add the patch group here.
$this->add_group('yui-patched', array(
'combine' => true,
'root' => $subversion . '/',
'patterns' => $patterns,
'modules' => $modules,
));
} else {
// The CDN is in use - we need to instead use the local combobase for this module and override the modules
// definition. We cannot use the local base - we must use the combobase because we cannot invalidate the
// local base in browser caches.
$fullpathbase = $combobase . $subversion . '/';
foreach ($patchedmodules as $modulename) {
$this->modules[$modulename] = array(
'fullpath' => $fullpathbase . $modulename . '/' . $modulename . '-min.js'
);
}
}
}
}
/**
* Invalidate all server and client side template caches.
*/
function template_reset_all_caches() {
global $CFG;
$next = time();
if (isset($CFG->templaterev) and $next <= $CFG->templaterev and $CFG->templaterev - $next < 60 * 60) {
// This resolves problems when reset is requested repeatedly within 1s,
// the < 1h condition prevents accidental switching to future dates
// because we might not recover from it.
$next = $CFG->templaterev + 1;
}
set_config('templaterev', $next);
}
/**
* Invalidate all server and client side JS caches.
*/
function js_reset_all_caches() {
global $CFG;
$next = time();
if (isset($CFG->jsrev) and $next <= $CFG->jsrev and $CFG->jsrev - $next < 60*60) {
// This resolves problems when reset is requested repeatedly within 1s,
// the < 1h condition prevents accidental switching to future dates
// because we might not recover from it.
$next = $CFG->jsrev+1;
}
set_config('jsrev', $next);
}
