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Diffstat (limited to '')
| -rw-r--r-- | third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/flight/lib/utils.js | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/flight/lib/utils.js b/third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/flight/lib/utils.js new file mode 100644 index 0000000000..31af777348 --- /dev/null +++ b/third_party/webkit/PerformanceTests/Speedometer/resources/flightjs-example-app/components/flight/lib/utils.js @@ -0,0 +1,236 @@ +// ========================================== +// Copyright 2013 Twitter, Inc +// Licensed under The MIT License +// http://opensource.org/licenses/MIT +// ========================================== + +"use strict"; + +define( + + [], + + function () { + + var arry = []; + var DEFAULT_INTERVAL = 100; + + var utils = { + + isDomObj: function(obj) { + return !!(obj.nodeType || (obj === window)); + }, + + toArray: function(obj, from) { + return arry.slice.call(obj, from); + }, + + // returns new object representing multiple objects merged together + // optional final argument is boolean which specifies if merge is recursive + // original objects are unmodified + // + // usage: + // var base = {a:2, b:6}; + // var extra = {b:3, c:4}; + // merge(base, extra); //{a:2, b:3, c:4} + // base; //{a:2, b:6} + // + // var base = {a:2, b:6}; + // var extra = {b:3, c:4}; + // var extraExtra = {a:4, d:9}; + // merge(base, extra, extraExtra); //{a:4, b:3, c:4. d: 9} + // base; //{a:2, b:6} + // + // var base = {a:2, b:{bb:4, cc:5}}; + // var extra = {a:4, b:{cc:7, dd:1}}; + // merge(base, extra, true); //{a:4, b:{bb:4, cc:7, dd:1}} + // base; //{a:2, b:6} + + merge: function(/*obj1, obj2,....deepCopy*/) { + // unpacking arguments by hand benchmarked faster + var l = arguments.length, + i = 0, + args = new Array(l + 1); + for (; i < l; i++) args[i + 1] = arguments[i]; + + if (l === 0) { + return {}; + } + + //start with empty object so a copy is created + args[0] = {}; + + if (args[args.length - 1] === true) { + //jquery extend requires deep copy as first arg + args.pop(); + args.unshift(true); + } + + return $.extend.apply(undefined, args); + }, + + // updates base in place by copying properties of extra to it + // optionally clobber protected + // usage: + // var base = {a:2, b:6}; + // var extra = {c:4}; + // push(base, extra); //{a:2, b:6, c:4} + // base; //{a:2, b:6, c:4} + // + // var base = {a:2, b:6}; + // var extra = {b: 4 c:4}; + // push(base, extra, true); //Error ("utils.push attempted to overwrite 'b' while running in protected mode") + // base; //{a:2, b:6} + // + // objects with the same key will merge recursively when protect is false + // eg: + // var base = {a:16, b:{bb:4, cc:10}}; + // var extra = {b:{cc:25, dd:19}, c:5}; + // push(base, extra); //{a:16, {bb:4, cc:25, dd:19}, c:5} + // + push: function(base, extra, protect) { + if (base) { + Object.keys(extra || {}).forEach(function(key) { + if (base[key] && protect) { + throw Error("utils.push attempted to overwrite '" + key + "' while running in protected mode"); + } + + if (typeof base[key] == "object" && typeof extra[key] == "object") { + //recurse + this.push(base[key], extra[key]); + } else { + //no protect, so extra wins + base[key] = extra[key]; + } + }, this); + } + + return base; + }, + + isEnumerable: function(obj, property) { + return Object.keys(obj).indexOf(property) > -1; + }, + + //build a function from other function(s) + //util.compose(a,b,c) -> a(b(c())); + //implementation lifted from underscore.js (c) 2009-2012 Jeremy Ashkenas + compose: function() { + var funcs = arguments; + + return function() { + var args = arguments; + + for (var i = funcs.length-1; i >= 0; i--) { + args = [funcs[i].apply(this, args)]; + } + + return args[0]; + }; + }, + + // Can only unique arrays of homogeneous primitives, e.g. an array of only strings, an array of only booleans, or an array of only numerics + uniqueArray: function(array) { + var u = {}, a = []; + + for (var i = 0, l = array.length; i < l; ++i) { + if (u.hasOwnProperty(array[i])) { + continue; + } + + a.push(array[i]); + u[array[i]] = 1; + } + + return a; + }, + + debounce: function(func, wait, immediate) { + if (typeof wait != 'number') { + wait = DEFAULT_INTERVAL; + } + + var timeout, result; + + return function() { + var context = this, args = arguments; + var later = function() { + timeout = null; + if (!immediate) { + result = func.apply(context, args); + } + }; + var callNow = immediate && !timeout; + + clearTimeout(timeout); + timeout = setTimeout(later, wait); + + if (callNow) { + result = func.apply(context, args); + } + + return result; + }; + }, + + throttle: function(func, wait) { + if (typeof wait != 'number') { + wait = DEFAULT_INTERVAL; + } + + var context, args, timeout, throttling, more, result; + var whenDone = this.debounce(function(){ + more = throttling = false; + }, wait); + + return function() { + context = this; args = arguments; + var later = function() { + timeout = null; + if (more) { + result = func.apply(context, args); + } + whenDone(); + }; + + if (!timeout) { + timeout = setTimeout(later, wait); + } + + if (throttling) { + more = true; + } else { + throttling = true; + result = func.apply(context, args); + } + + whenDone(); + return result; + }; + }, + + countThen: function(num, base) { + return function() { + if (!--num) { return base.apply(this, arguments); } + }; + }, + + delegate: function(rules) { + return function(e, data) { + var target = $(e.target), parent; + + Object.keys(rules).forEach(function(selector) { + if ((parent = target.closest(selector)).length) { + data = data || {}; + data.el = parent[0]; + return rules[selector].apply(this, [e, data]); + } + }, this); + }; + } + + }; + + return utils; + } +); |