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/*!
* Augment mw.loader to facilitate module-level profiling.
*
* @since 1.32
*/
/* global mw */
( function () {
'use strict';
var moduleTimes = Object.create( null );
/**
* Private hooks inserted into mw.loader code if MediaWiki configuration
* `$wgResourceLoaderEnableJSProfiler` is `true`.
*
* To use this data, run `mw.inspect( 'time' )` from the browser console.
* See mw#inspect().
*
* @private
* @class
* @singleton
*/
mw.loader.profiler = {
onExecuteStart: function ( moduleName ) {
var time = performance.now();
if ( moduleTimes[ moduleName ] ) {
throw new Error( 'Unexpected perf record for "' + moduleName + '".' );
}
moduleTimes[ moduleName ] = {
executeStart: time,
executeEnd: null,
scriptStart: null,
scriptEnd: null
};
},
onExecuteEnd: function ( moduleName ) {
var time = performance.now();
moduleTimes[ moduleName ].executeEnd = time;
},
onScriptStart: function ( moduleName ) {
var time = performance.now();
moduleTimes[ moduleName ].scriptStart = time;
},
onScriptEnd: function ( moduleName ) {
var time = performance.now();
moduleTimes[ moduleName ].scriptEnd = time;
},
/**
* For internal use by inspect.reports#time.
*
* @private
* @param {string} moduleName
* @return {Object|null}
* @throws {Error} If the perf record is incomplete.
*/
getProfile: function ( moduleName ) {
var times, key, execute, script, total;
times = moduleTimes[ moduleName ];
if ( !times ) {
return null;
}
for ( key in times ) {
if ( times[ key ] === null ) {
throw new Error( 'Incomplete perf record for "' + moduleName + '".', times );
}
}
execute = times.executeEnd - times.executeStart;
script = times.scriptEnd - times.scriptStart;
total = execute + script;
return {
name: moduleName,
execute: execute,
script: script,
total: total
};
}
};
}() );
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