Current File : //www/varak.net/wiki.varak.net/resources/src/mediawiki.inspect.js
/*!
* The mediawiki.inspect module.
*
* @author Ori Livneh
* @since 1.22
*/
/* eslint-disable no-console */
( function () {
// mw.inspect is a singleton class with static methods
// that itself can also be invoked as a function (mediawiki.base/mw#inspect).
// In JavaScript, that is implemented by starting with a function,
// and subsequently setting additional properties on the function object.
/**
* Tools for inspecting page composition and performance.
*
* @class mw.inspect
* @singleton
*/
var inspect = mw.inspect,
byteLength = require( 'mediawiki.String' ).byteLength,
hasOwn = Object.prototype.hasOwnProperty;
function sortByProperty( array, prop, descending ) {
var order = descending ? -1 : 1;
return array.sort( function ( a, b ) {
if ( a[ prop ] === undefined || b[ prop ] === undefined ) {
// Sort undefined to the end, regardless of direction
return a[ prop ] !== undefined ? -1 : b[ prop ] !== undefined ? 1 : 0;
}
return a[ prop ] > b[ prop ] ? order : a[ prop ] < b[ prop ] ? -order : 0;
} );
}
function humanSize( bytes ) {
var i,
units = [ '', ' KiB', ' MiB', ' GiB', ' TiB', ' PiB' ];
if ( !$.isNumeric( bytes ) || bytes === 0 ) { return bytes; }
for ( i = 0; bytes >= 1024; bytes /= 1024 ) { i++; }
// Maintain one decimal for kB and above, but don't
// add ".0" for bytes.
return bytes.toFixed( i > 0 ? 1 : 0 ) + units[ i ];
}
/**
* Return a map of all dependency relationships between loaded modules.
*
* @return {Object} Maps module names to objects. Each sub-object has
* two properties, 'requires' and 'requiredBy'.
*/
inspect.getDependencyGraph = function () {
var modules = inspect.getLoadedModules(),
graph = {};
modules.forEach( function ( moduleName ) {
var dependencies = mw.loader.moduleRegistry[ moduleName ].dependencies || [];
if ( !hasOwn.call( graph, moduleName ) ) {
graph[ moduleName ] = { requiredBy: [] };
}
graph[ moduleName ].requires = dependencies;
dependencies.forEach( function ( depName ) {
if ( !hasOwn.call( graph, depName ) ) {
graph[ depName ] = { requiredBy: [] };
}
graph[ depName ].requiredBy.push( moduleName );
} );
} );
return graph;
};
/**
* Calculate the byte size of a ResourceLoader module.
*
* @param {string} moduleName The name of the module
* @return {number|null} Module size in bytes or null
*/
inspect.getModuleSize = function ( moduleName ) {
var module = mw.loader.moduleRegistry[ moduleName ],
args, i, size;
if ( module.state !== 'ready' ) {
return null;
}
if ( !module.style && !module.script ) {
return 0;
}
function getFunctionBody( func ) {
return String( func )
// To ensure a deterministic result, replace the start of the function
// declaration with a fixed string. For example, in Chrome 55, it seems
// V8 seemingly-at-random decides to sometimes put a line break between
// the opening brace and first statement of the function body. T159751.
.replace( /^\s*function\s*\([^)]*\)\s*{\s*/, 'function(){' )
.replace( /\s*}\s*$/, '}' );
}
// Based on the load.php response for this module.
// For example: `mw.loader.implement("example", function(){}, {"css":[".x{color:red}"]});`
// @see mw.loader.store.set().
args = [
moduleName,
module.script,
module.style,
module.messages,
module.templates
];
// Trim trailing null or empty object, as load.php would have done.
// @see ResourceLoader::makeLoaderImplementScript and ResourceLoader::trimArray.
i = args.length;
while ( i-- ) {
if ( args[ i ] === null || ( $.isPlainObject( args[ i ] ) && $.isEmptyObject( args[ i ] ) ) ) {
args.splice( i, 1 );
} else {
break;
}
}
size = 0;
for ( i = 0; i < args.length; i++ ) {
if ( typeof args[ i ] === 'function' ) {
size += byteLength( getFunctionBody( args[ i ] ) );
} else {
size += byteLength( JSON.stringify( args[ i ] ) );
}
}
return size;
};
/**
* Given CSS source, count both the total number of selectors it
* contains and the number which match some element in the current
* document.
*
* @param {string} css CSS source
* @return {Object} Selector counts
* @return {number} return.selectors Total number of selectors
* @return {number} return.matched Number of matched selectors
*/
inspect.auditSelectors = function ( css ) {
var selectors = { total: 0, matched: 0 },
style = document.createElement( 'style' );
style.textContent = css;
document.body.appendChild( style );
// eslint-disable-next-line no-restricted-properties
$.each( style.sheet.cssRules, function ( index, rule ) {
selectors.total++;
// document.querySelector() on prefixed pseudo-elements can throw exceptions
// in Firefox and Safari. Ignore these exceptions.
// https://bugs.webkit.org/show_bug.cgi?id=149160
// https://bugzilla.mozilla.org/show_bug.cgi?id=1204880
try {
if ( document.querySelector( rule.selectorText ) !== null ) {
selectors.matched++;
}
} catch ( e ) {}
} );
document.body.removeChild( style );
return selectors;
};
/**
* Get a list of all loaded ResourceLoader modules.
*
* @return {Array} List of module names
*/
inspect.getLoadedModules = function () {
return mw.loader.getModuleNames().filter( function ( module ) {
return mw.loader.getState( module ) === 'ready';
} );
};
/**
* Print tabular data to the console, using console.table, console.log,
* or mw.log (in declining order of preference).
*
* @param {Array} data Tabular data represented as an array of objects
* with common properties.
*/
inspect.dumpTable = function ( data ) {
try {
// Use Function.prototype#call to force an exception on Firefox,
// which doesn't define console#table but doesn't complain if you
// try to invoke it.
// eslint-disable-next-line no-useless-call
console.table.call( console, data );
return;
} catch ( e ) {}
try {
console.log( JSON.stringify( data, null, 2 ) );
} catch ( e ) {}
};
/**
* Generate and print reports.
*
* When invoked without arguments, prints all available reports.
*
* @param {...string} [reports] One or more of "size", "css", "store", or "time".
*/
inspect.runReports = function () {
var reports = arguments.length > 0 ?
Array.prototype.slice.call( arguments ) :
Object.keys( inspect.reports );
reports.forEach( function ( name ) {
if ( console.group ) {
console.group( 'mw.inspect ' + name + ' report' );
} else {
console.log( 'mw.inspect ' + name + ' report' );
}
inspect.dumpTable( inspect.reports[ name ]() );
if ( console.group ) {
console.groupEnd( 'mw.inspect ' + name + ' report' );
}
} );
};
/**
* Perform a string search across the JavaScript and CSS source code
* of all loaded modules and return an array of the names of the
* modules that matched.
*
* @param {string|RegExp} pattern String or regexp to match.
* @return {Array} Array of the names of modules that matched.
*/
inspect.grep = function ( pattern ) {
if ( typeof pattern.test !== 'function' ) {
pattern = new RegExp( mw.RegExp.escape( pattern ), 'g' );
}
return inspect.getLoadedModules().filter( function ( moduleName ) {
var module = mw.loader.moduleRegistry[ moduleName ];
// Grep module's JavaScript
if ( typeof module.script === 'function' && pattern.test( module.script.toString() ) ) {
return true;
}
// Grep module's CSS
if (
$.isPlainObject( module.style ) && Array.isArray( module.style.css ) &&
pattern.test( module.style.css.join( '' ) )
) {
// Module's CSS source matches
return true;
}
return false;
} );
};
/**
* @private
* @class mw.inspect.reports
* @singleton
*/
inspect.reports = {
/**
* Generate a breakdown of all loaded modules and their size in
* kilobytes. Modules are ordered from largest to smallest.
*
* @return {Object[]} Size reports
*/
size: function () {
// Map each module to a descriptor object.
var modules = inspect.getLoadedModules().map( function ( module ) {
return {
name: module,
size: inspect.getModuleSize( module )
};
} );
// Sort module descriptors by size, largest first.
sortByProperty( modules, 'size', true );
// Convert size to human-readable string.
modules.forEach( function ( module ) {
module.sizeInBytes = module.size;
module.size = humanSize( module.size );
} );
return modules;
},
/**
* For each module with styles, count the number of selectors, and
* count how many match against some element currently in the DOM.
*
* @return {Object[]} CSS reports
*/
css: function () {
var modules = [];
inspect.getLoadedModules().forEach( function ( name ) {
var css, stats, module = mw.loader.moduleRegistry[ name ];
try {
css = module.style.css.join();
} catch ( e ) { return; } // skip
stats = inspect.auditSelectors( css );
modules.push( {
module: name,
allSelectors: stats.total,
matchedSelectors: stats.matched,
percentMatched: stats.total !== 0 ?
( stats.matched / stats.total * 100 ).toFixed( 2 ) + '%' : null
} );
} );
sortByProperty( modules, 'allSelectors', true );
return modules;
},
/**
* Report stats on mw.loader.store: the number of localStorage
* cache hits and misses, the number of items purged from the
* cache, and the total size of the module blob in localStorage.
*
* @return {Object[]} Store stats
*/
store: function () {
var raw, stats = { enabled: mw.loader.store.enabled };
if ( stats.enabled ) {
$.extend( stats, mw.loader.store.stats );
try {
raw = localStorage.getItem( mw.loader.store.getStoreKey() );
stats.totalSizeInBytes = byteLength( raw );
stats.totalSize = humanSize( byteLength( raw ) );
} catch ( e ) {}
}
return [ stats ];
},
/**
* Generate a breakdown of all loaded modules and their time
* spent during initialisation (measured in milliseconds).
*
* This timing data is collected by mw.loader.profiler.
*
* @return {Object[]} Table rows
*/
time: function () {
var modules;
if ( !mw.loader.profiler ) {
mw.log.warn( 'mw.inspect: The time report requires $wgResourceLoaderEnableJSProfiler.' );
return [];
}
modules = inspect.getLoadedModules()
.map( function ( moduleName ) {
return mw.loader.profiler.getProfile( moduleName );
} )
.filter( function ( perf ) {
// Exclude modules that reached "ready" state without involvement from mw.loader.
// This is primarily styles-only as loaded via <link rel="stylesheet">.
return perf !== null;
} );
// Sort by total time spent, highest first.
sortByProperty( modules, 'total', true );
// Add human-readable strings
modules.forEach( function ( module ) {
module.totalInMs = module.total;
module.total = module.totalInMs.toLocaleString() + ' ms';
} );
return modules;
}
};
if ( mw.config.get( 'debug' ) ) {
mw.log( 'mw.inspect: reports are not available in debug mode.' );
}
}() );
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