}
/**
- * Recursively resolves dependencies and detects circular references
+ * Resolves dependencies and detects circular references.
+ *
+ * @param module String Name of the top-level module whose dependencies shall be
+ * resolved and sorted.
+ * @param resolved Array Returns a topological sort of the given module and its
+ * dependencies, such that later modules depend on earlier modules. The array
+ * contains the module names. If the array contains already some module names,
+ * this function appends its result to the pre-existing array.
+ * @param unresolved Object [optional] Hash used to track the current dependency
+ * chain; used to report loops in the dependency graph.
+ * @throws Error if any unregistered module or a dependency loop is encountered
*/
- function recurse( module, resolved, unresolved ) {
+ function sortDependencies( module, resolved, unresolved ) {
var n, deps, len;
if ( registry[module] === undefined ) {
registry[module].dependencies = [registry[module].dependencies];
}
}
+ if ( $.inArray( module, resolved ) !== -1 ) {
+ // Module already resolved; nothing to do.
+ return;
+ }
+ // unresolved is optional, supply it if not passed in
+ if ( !unresolved ) {
+ unresolved = {};
+ }
// Tracks down dependencies
deps = registry[module].dependencies;
len = deps.length;
for ( n = 0; n < len; n += 1 ) {
if ( $.inArray( deps[n], resolved ) === -1 ) {
- if ( $.inArray( deps[n], unresolved ) !== -1 ) {
+ if ( unresolved[deps[n]] ) {
throw new Error(
'Circular reference detected: ' + module +
' -> ' + deps[n]
}
// Add to unresolved
- unresolved[unresolved.length] = module;
- recurse( deps[n], resolved, unresolved );
- // module is at the end of unresolved
- unresolved.pop();
+ unresolved[module] = true;
+ sortDependencies( deps[n], resolved, unresolved );
+ delete unresolved[module];
}
}
resolved[resolved.length] = module;
}
/**
- * Gets a list of module names that a module depends on in their proper dependency order
+ * Gets a list of module names that a module depends on in their proper dependency
+ * order.
*
* @param module string module name or array of string module names
* @return list of dependencies, including 'module'.
* @throws Error if circular reference is detected
*/
function resolve( module ) {
- var modules, m, deps, n, resolved;
+ var m, resolved;
// Allow calling with an array of module names
if ( $.isArray( module ) ) {
- modules = [];
+ resolved = [];
for ( m = 0; m < module.length; m += 1 ) {
- deps = resolve( module[m] );
- for ( n = 0; n < deps.length; n += 1 ) {
- modules[modules.length] = deps[n];
- }
+ sortDependencies( module[m], resolved );
}
- return modules;
+ return resolved;
}
if ( typeof module === 'string' ) {
resolved = [];
- recurse( module, resolved, [] );
+ sortDependencies( module, resolved );
return resolved;
}
}
/**
- * Automatically executes jobs and modules which are pending with satistifed dependencies.
+ * Determine whether all dependencies are in state 'ready', which means we may
+ * execute the module or job now.
+ *
+ * @param dependencies Array dependencies (module names) to be checked.
*
- * This is used when dependencies are satisfied, such as when a module is executed.
+ * @return Boolean true if all dependencies are in state 'ready', false otherwise
*/
- function handlePending( module ) {
- var j, r;
+ function allReady( dependencies ) {
+ return filter( 'ready', dependencies ).length === dependencies.length;
+ }
- try {
- // Run jobs whose dependencies have just been met
- for ( j = 0; j < jobs.length; j += 1 ) {
- if ( compare(
- filter( 'ready', jobs[j].dependencies ),
- jobs[j].dependencies ) )
- {
- var callback = jobs[j].ready;
- jobs.splice( j, 1 );
- j -= 1;
- if ( $.isFunction( callback ) ) {
- callback();
+ /**
+ * Log a message to window.console, if possible. Useful to force logging of some
+ * errors that are otherwise hard to detect, even if mw.log is not available. (I.e.,
+ * this logs also if not in debug mode.)
+ *
+ * @param msg String text for the log entry
+ * @param e Error [optional] to also log.
+ */
+ function log( msg, e ) {
+ if ( window.console && typeof window.console.log === 'function' ) {
+ console.log( msg );
+ if ( e ) {
+ console.log( e );
+ }
+ }
+ }
+
+ /**
+ * A module has entered state 'ready', 'error', or 'missing'. Automatically update pending jobs
+ * and modules that depend upon this module. if the given module failed, propagate the 'error'
+ * state up the dependency tree; otherwise, execute all jobs/modules that now have all their
+ * dependencies satisfied. On jobs depending on a failed module, run the error callback, if any.
+ *
+ * @param module String name of module that entered one of the states 'ready', 'error', or 'missing'.
+ */
+ function handlePending( module ) {
+ var j, job, hasErrors, m, stateChange;
+
+ // Modules.
+ if ( $.inArray( registry[module].state, ['error', 'missing'] ) !== -1 ) {
+ // If the current module failed, mark all dependent modules also as failed.
+ // Iterate until steady-state to propagate the error state upwards in the
+ // dependency tree.
+ do {
+ stateChange = false;
+ for ( m in registry ) {
+ if ( $.inArray( registry[m].state, ['error', 'missing'] ) === -1 ) {
+ if ( filter( ['error', 'missing'], registry[m].dependencies ).length > 0 ) {
+ registry[m].state = 'error';
+ stateChange = true;
+ }
}
}
- }
- // Execute modules whose dependencies have just been met
- for ( r in registry ) {
- if ( registry[r].state === 'loaded' ) {
- if ( compare(
- filter( ['ready'], registry[r].dependencies ),
- registry[r].dependencies ) )
- {
- execute( r );
+ } while ( stateChange );
+ }
+
+ // Execute all jobs whose dependencies are either all satisfied or contain at least one failed module.
+ for ( j = 0; j < jobs.length; j += 1 ) {
+ hasErrors = filter( ['error', 'missing'], jobs[j].dependencies ).length > 0;
+ if ( hasErrors || allReady( jobs[j].dependencies ) ) {
+ // All dependencies satisfied, or some have errors
+ job = jobs[j];
+ jobs.splice( j, 1 );
+ j -= 1;
+ try {
+ if ( hasErrors ) {
+ throw new Error ("Module " + module + " failed.");
+ } else {
+ if ( $.isFunction( job.ready ) ) {
+ job.ready();
+ }
+ }
+ } catch ( e ) {
+ if ( $.isFunction( job.error ) ) {
+ try {
+ job.error( e, [module] );
+ } catch ( ex ) {
+ // A user-defined operation raised an exception. Swallow to protect
+ // our state machine!
+ log( 'mw.loader::handlePending> Exception thrown by job.error()', ex );
+ }
}
}
}
- } catch ( e ) {
- // Run error callbacks of jobs affected by this condition
- for ( j = 0; j < jobs.length; j += 1 ) {
- if ( $.inArray( module, jobs[j].dependencies ) !== -1 ) {
- if ( $.isFunction( jobs[j].error ) ) {
- jobs[j].error( e, module );
- }
- jobs.splice( j, 1 );
- j -= 1;
+ }
+
+ if ( registry[module].state === 'ready' ) {
+ // The current module became 'ready'. Recursively execute all dependent modules that are loaded
+ // and now have all dependencies satisfied.
+ for ( m in registry ) {
+ if ( registry[m].state === 'loaded' && allReady( registry[m].dependencies ) ) {
+ execute( m );
}
}
- throw e;
}
}
/**
* Adds a script tag to the DOM, either using document.write or low-level DOM manipulation,
- * depending on whether document-ready has occured yet and whether we are in async mode.
+ * depending on whether document-ready has occurred yet and whether we are in async mode.
*
* @param src String: URL to script, will be used as the src attribute in the script tag
* @param callback Function: Optional callback which will be run when the script is done
*
* @param module string module name to execute
*/
- function execute( module, callback ) {
+ function execute( module ) {
var style, media, i, script, markModuleReady, nestedAddScript;
if ( registry[module] === undefined ) {
markModuleReady = function() {
registry[module].state = 'ready';
handlePending( module );
- if ( $.isFunction( callback ) ) {
- callback();
- }
};
nestedAddScript = function ( arr, callback, async, i ) {
// Recursively call addScript() in its own callback
} catch ( e ) {
// This needs to NOT use mw.log because these errors are common in production mode
// and not in debug mode, such as when a symbol that should be global isn't exported
- if ( window.console && typeof window.console.log === 'function' ) {
- console.log( 'mw.loader::execute> Exception thrown by ' + module + ': ' + e.message );
- console.log( e );
- }
+ log('mw.loader::execute> Exception thrown by ' + module + ': ' + e.message, e);
registry[module].state = 'error';
+ handlePending( module );
}
}
}
currReqBase = $.extend( { 'version': formatVersionNumber( maxVersion ) }, reqBase );
+ // For user modules append a user name to the request.
+ if ( group === "user" && mw.config.get( 'wgUserName' ) !== null ) {
+ currReqBase.user = mw.config.get( 'wgUserName' );
+ }
currReqBaseLength = $.param( currReqBase ).length;
async = true;
// We may need to split up the request to honor the query string length limit,
if ( registry[module] !== undefined && registry[module].script !== undefined ) {
throw new Error( 'module already implemented: ' + module );
}
- // Mark module as loaded
- registry[module].state = 'loaded';
// Attach components
registry[module].script = script;
registry[module].style = style;
registry[module].messages = msgs;
- // Execute or queue callback
- if ( compare(
- filter( ['ready'], registry[module].dependencies ),
- registry[module].dependencies ) )
- {
- execute( module );
+ // The module may already have been marked as erroneous
+ if ( $.inArray( registry[module].state, ['error', 'missing'] ) === -1 ) {
+ registry[module].state = 'loaded';
+ if ( allReady( registry[module].dependencies ) ) {
+ execute( module );
+ }
}
},
}
// Resolve entire dependency map
dependencies = resolve( dependencies );
- // If all dependencies are met, execute ready immediately
- if ( compare( filter( ['ready'], dependencies ), dependencies ) ) {
+ if ( allReady( dependencies ) ) {
+ // Run ready immediately
if ( $.isFunction( ready ) ) {
ready();
}
- }
- // If any dependencies have errors execute error immediately
- else if ( filter( ['error'], dependencies ).length ) {
+ } else if ( filter( ['error', 'missing'], dependencies ).length ) {
+ // Execute error immediately if any dependencies have errors
if ( $.isFunction( error ) ) {
- error( new Error( 'one or more dependencies have state "error"' ),
+ error( new Error( 'one or more dependencies have state "error" or "missing"' ),
dependencies );
}
- }
- // Since some dependencies are not yet ready, queue up a request
- else {
+ } else {
+ // Not all dependencies are ready: queue up a request
request( dependencies, ready, error );
}
},
* be assumed if loading a URL, and false will be assumed otherwise.
*/
load: function ( modules, type, async ) {
- var filtered, m;
+ var filtered, m, module;
// Validate input
if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
// an array of unrelated modules, whereas the modules passed to
// using() are related and must all be loaded.
for ( filtered = [], m = 0; m < modules.length; m += 1 ) {
- if ( registry[modules[m]] !== undefined ) {
- filtered[filtered.length] = modules[m];
+ module = registry[modules[m]];
+ if ( module !== undefined ) {
+ if ( $.inArray( module.state, ['error', 'missing'] ) === -1 ) {
+ filtered[filtered.length] = modules[m];
+ }
}
}
+ if (filtered.length === 0) {
+ return;
+ }
// Resolve entire dependency map
filtered = resolve( filtered );
- // If all modules are ready, nothing dependency be done
- if ( compare( filter( ['ready'], filtered ), filtered ) ) {
+ // If all modules are ready, nothing to be done
+ if ( allReady( filtered ) ) {
return;
}
- // If any modules have errors
- if ( filter( ['error'], filtered ).length ) {
+ // If any modules have errors: also quit.
+ if ( filter( ['error', 'missing'], filtered ).length ) {
return;
}
- // Since some modules are not yet ready, queue up a request
+ // Since some modules are not yet ready, queue up a request.
request( filtered, null, null, async );
- return;
},
/**
if ( registry[module] === undefined ) {
mw.loader.register( module );
}
- if ( state === 'ready' && registry[module].state !== state) {
+ if ( $.inArray(state, ['ready', 'error', 'missing']) !== -1
+ && registry[module].state !== state ) {
// Make sure pending modules depending on this one get executed if their
// dependencies are now fulfilled!
registry[module].state = state;
dépôts / lhc / web / wiklou.git / blobdiff