* @param {string} module Module name to execute
*/
function execute( module ) {
- var key, value, media, i, urls, cssHandle, checkCssHandles, runScript,
- cssHandlesRegistered = false;
+ var key, value, media, i, urls, cssHandle, siteDeps, siteDepErr, runScript,
+ cssPending = 0;
if ( !hasOwn.call( registry, module ) ) {
throw new Error( 'Module has not been registered yet: ' + module );
mw.templates.set( module, registry[ module ].templates );
}
- // Make sure we don't run the scripts until all stylesheet insertions have completed.
- ( function () {
- var pending = 0;
- checkCssHandles = function () {
- var ex, dependencies;
- // cssHandlesRegistered ensures we don't take off too soon, e.g. when
- // one of the cssHandles is fired while we're still creating more handles.
- if ( cssHandlesRegistered && pending === 0 && runScript ) {
- if ( module === 'user' ) {
- // Implicit dependency on the site module. Not real dependency because
- // it should run after 'site' regardless of whether it succeeds or fails.
- // Note: This is a simplified version of mw.loader.using(), inlined here
- // as using() depends on jQuery (T192623).
- try {
- dependencies = resolve( [ 'site' ] );
- } catch ( e ) {
- ex = e;
- runScript();
- }
- if ( ex === undefined ) {
- enqueue( dependencies, runScript, runScript );
- }
- } else {
- runScript();
- }
- runScript = undefined; // Revoke
+ // Adding of stylesheets is asynchronous via addEmbeddedCSS().
+ // The below function uses a counting semaphore to make sure we don't call
+ // runScript() until after this module's stylesheets have been inserted
+ // into the DOM.
+ cssHandle = function () {
+ // Increase semaphore, when creating a callback for addEmbeddedCSS.
+ cssPending++;
+ return function () {
+ var runScriptCopy;
+ // Decrease semaphore, when said callback is invoked.
+ cssPending--;
+ if ( cssPending === 0 ) {
+ // Paranoia:
+ // This callback is exposed to addEmbeddedCSS, which is outside the execute()
+ // function and is not concerned with state-machine integrity. In turn,
+ // addEmbeddedCSS() actually exposes stuff further into the browser (rAF).
+ // If increment and decrement callbacks happen in the wrong order, or start
+ // again afterwards, then this branch could be reached multiple times.
+ // To protect the integrity of the state-machine, prevent that from happening
+ // by making runScript() cannot be called more than once. We store a private
+ // reference when we first reach this branch, then deference the original, and
+ // call our reference to it.
+ runScriptCopy = runScript;
+ runScript = undefined;
+ runScriptCopy();
}
};
- cssHandle = function () {
- var check = checkCssHandles;
- pending++;
- return function () {
- if ( check ) {
- pending--;
- check();
- check = undefined; // Revoke
- }
- };
- };
- }() );
+ };
// Process styles (see also mw.loader.implement)
// * back-compat: { <media>: css }
}
}
- // End profiling of execute()-self before we call checkCssHandles(),
- // which (sometimes asynchronously) calls runScript(), which we want
- // to measure separately without overlap.
+ // End profiling of execute()-self before we call runScript(),
+ // which we want to measure separately without overlap.
$CODE.profileExecuteEnd();
- // Kick off.
- cssHandlesRegistered = true;
- checkCssHandles();
+ if ( module === 'user' ) {
+ // Implicit dependency on the site module. Not a real dependency because it should
+ // run after 'site' regardless of whether it succeeds or fails.
+ // Note: This is a simplified version of mw.loader.using(), inlined here because
+ // mw.loader.using() is part of mediawiki.base (depends on jQuery; T192623).
+ try {
+ siteDeps = resolve( [ 'site' ] );
+ } catch ( e ) {
+ siteDepErr = e;
+ runScript();
+ }
+ if ( siteDepErr === undefined ) {
+ enqueue( siteDeps, runScript, runScript );
+ }
+ } else if ( cssPending === 0 ) {
+ // Regular module without styles
+ runScript();
+ }
+ // else: runScript will get called via cssHandle()
}
function sortQuery( o ) {
dépôts / lhc / web / wiklou.git / blobdiff