1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 'use strict'; 6 7 base.require('base.iteration_helpers'); 8 9 base.exportTo('base', function() { 10 /** 11 * Adds a {@code getInstance} static method that always return the same 12 * instance object. 13 * @param {!Function} ctor The constructor for the class to add the static 14 * method to. 15 */ 16 function addSingletonGetter(ctor) { 17 ctor.getInstance = function() { 18 return ctor.instance_ || (ctor.instance_ = new ctor()); 19 }; 20 } 21 22 function instantiateTemplate(selector) { 23 return document.querySelector(selector).content.cloneNode(true); 24 } 25 26 function tracedFunction(fn, name, opt_this) { 27 function F() { 28 console.time(name); 29 try { 30 fn.apply(opt_this, arguments); 31 } finally { 32 console.timeEnd(name); 33 } 34 } 35 return F; 36 } 37 38 function normalizeException(e) { 39 if (typeof(e) == 'string') { 40 return { 41 message: e, 42 stack: ['<unknown>'] 43 }; 44 } 45 46 return { 47 message: e.message, 48 stack: e.stack ? e.stack : ['<unknown>'] 49 }; 50 } 51 52 function stackTrace() { 53 var stack = new Error().stack + ''; 54 stack = stack.split('\n'); 55 return stack.slice(2); 56 } 57 58 return { 59 addSingletonGetter: addSingletonGetter, 60 61 tracedFunction: tracedFunction, 62 normalizeException: normalizeException, 63 instantiateTemplate: instantiateTemplate, 64 stackTrace: stackTrace 65 }; 66 }); 67 68
