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/*!
* Tools for inspecting page composition and performance.
*
* @author Ori Livneh
* @since 1.22
*/
/*jshint devel:true */
( function ( mw, $ ) {
function sortByProperty( array, prop, descending ) {
var order = descending ? -1 : 1;
return array.sort( function ( a, b ) {
return a[prop] > b[prop] ? order : a[prop] < b[prop] ? -order : 0;
} );
}
/**
* @class mw.inspect
* @singleton
*/
var inspect = {
/**
* 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
*/
getModuleSize: function ( moduleName ) {
var module = mw.loader.moduleRegistry[ moduleName ],
payload = 0;
if ( mw.loader.getState( moduleName ) !== 'ready' ) {
return null;
}
if ( !module.style && !module.script ) {
return null;
}
// Tally CSS
if ( module.style && $.isArray( module.style.css ) ) {
$.each( module.style.css, function ( i, stylesheet ) {
payload += $.byteLength( stylesheet );
} );
}
// Tally JavaScript
if ( $.isFunction( module.script ) ) {
payload += $.byteLength( module.script.toString() );
}
return payload;
},
/**
* 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 Selector counts
* @return {number} return.selectors Total number of selectors
* @return {number} return.matched Number of matched selectors
*/
auditSelectors: function ( css ) {
var selectors = { total: 0, matched: 0 },
style = document.createElement( 'style' ),
sheet, rules;
style.textContent = css;
document.body.appendChild( style );
// Standards-compliant browsers use .sheet.cssRules, IE8 uses .styleSheet.rules…
sheet = style.sheet || style.styleSheet;
rules = sheet.cssRules || sheet.rules;
$.each( rules, function ( index, rule ) {
selectors.total++;
if ( document.querySelector( rule.selectorText ) !== null ) {
selectors.matched++;
}
} );
document.body.removeChild( style );
return selectors;
},
/**
* Get a list of all loaded ResourceLoader modules.
*
* @return {Array} List of module names
*/
getLoadedModules: function () {
return $.grep( mw.loader.getModuleNames(), 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.
*/
dumpTable: function ( data ) {
try {
// Bartosz made me put this here.
if ( window.opera ) { throw window.opera; }
// 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.
console.table.call( console, data );
return;
} catch (e) {}
try {
console.log( $.toJSON( data, null, 2 ) );
return;
} catch (e) {}
mw.log( data );
},
/**
* Generate and print one more reports. When invoked with no arguments,
* print all reports.
*
* @param {string...} [reports] Report names to run, or unset to print
* all available reports.
*/
runReports: function () {
var reports = arguments.length > 0 ?
Array.prototype.slice.call( arguments ) :
$.map( inspect.reports, function ( v, k ) { return k; } );
$.each( reports, function ( index, name ) {
inspect.dumpTable( inspect.reports[name]() );
} );
},
/**
* @class mw.inspect.reports
* @singleton
*/
reports: {
/**
* Generate a breakdown of all loaded modules and their size in
* kilobytes. Modules are ordered from largest to smallest.
*/
size: function () {
// Map each module to a descriptor object.
var modules = $.map( inspect.getLoadedModules(), 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.
$.each( modules, function ( i, module ) {
module.size = module.size > 1024 ?
( module.size / 1024 ).toFixed( 2 ) + ' KB' :
( module.size !== null ? module.size + ' B' : null );
} );
return modules;
},
/**
* For each module with styles, count the number of selectors, and
* count how many match against some element currently in the DOM.
*/
css: function () {
var modules = [];
$.each( inspect.getLoadedModules(), function ( index, 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;
},
}
};
if ( mw.config.get( 'debug' ) ) {
mw.log( 'mw.inspect: reports are not available in debug mode.' );
}
mw.inspect = inspect;
}( mediaWiki, jQuery ) );
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