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stressTest.js
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stressTest.js
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var stressTest = (function () {
var baselineName = '__STRESSTESTBASELINE__',
whitespace = /\s+/,
Object_keys = Object.keys || function (obj) {
var ret = [];
for (var i in obj) if (obj.hasOwnProperty(i)) ret.push(i);
return ret;
},
forEach = Array.prototype.forEach || function (func) {
for (var i = 0, ii = this.length; i < ii; i++) {
func.call(this, this[i], i, this);
}
},
filter = Array.prototype.filter || function (func) {
var ret = [];
forEach.call(this, function (ii) {
if (func(ii)) ret.push(ii);
});
return ret;
}, indexOf = Array.prototype.indexOf || function(item){
for(var i = 0, ii = this.length; i<ii; i++){
if(this[i]===item)
return i;
}
return -1;
};
function style(elm, props){
forEach.call(Object_keys(props),
function (ii) {
try {
var name = ii.replace(/\-([a-z])/ig, function(a, l){ return l.toUpperCase() });
var value = props[ii];
elm.style[name] = typeof value == 'number' && name != 'zIndex' ? (value + 'px') : value;
} catch(x) { }
}
);
}
function indexElements(state) {
var all = state.all || getChildren(document), ret = {};
forEach.call(all, function (elm) {
if (elm.className && !elm.toString().match(/svg/i)) {
forEach.call(
filter.call(elm.className.split(whitespace), function (n) { return n.length > 0; }),
function (n) {
if (!ret['.'+n]) ret['.'+n] = [];
ret['.'+n].push(elm);
});
} else if(elm.id) {
if (!ret['#'+elm.id]) ret['#'+elm.id] = [];
ret['#'+elm.id].push(elm);
}
});
return ret;
}
function getChildren(elm, tagName) {
if(!tagName) tagName = '*';
if (typeof elm.length != 'undefined') {
var all = []; //, ret = [], hash = {};
forEach.call(elm, function (ii) {
forEach.call(getChildren(ii, tagName), function(ce){
all.push(ce);
});
});
//need a way to make sure the list is distinct
return all; //ret;
}
var tags = tagName.split(' ');
if(tags.length > 1){
var all = [];
forEach.call(tags, function (ii) {
forEach.call(getChildren(elm, ii), function(ce){
all.push(ce);
});
});
return all;
}
return elm.all && tagName == '*' ? elm.all : elm.getElementsByTagName(tagName);
}
/*var l = 0;
function log(){
var args = [l++];
args.push.apply(args, arguments);
console.log.apply(console, args);
}*/
//var fid = 0;
function bind(elm, name, func) {
var parts = name.split('.'),
_func = !elm.attachEvent ? func : function(){ func.call(elm, window.event); };
if (!elm.__events) elm.__events = {};
if (!elm.__events[name]) elm.__events[name] = [];
//if(!func.id) func.id = fid++;
//log('binding',parts, func, func.id);
elm.__events[name].push(_func);
if (elm.attachEvent) elm.attachEvent('on' + parts[0], _func);
else if (elm.addEventListener) elm.addEventListener(parts[0], _func, true);
}
function unbind(elm, name, func) {
if (!func && elm.__events && elm.__events[name]) {
var evnts = [], existing = elm.__events[name];
evnts.push.apply(evnts, existing);
existing.slice(existing.length);
forEach.call(evnts, function (ii) {
unbind(elm, name, ii);
});
} else {
var parts = name.split('.');
if (elm.detachEvent) elm.detachEvent('on' + parts[0], func);
else if (elm.removeEventListener) {
//log('unbinding', parts, func, func.id);
elm.removeEventListener(parts[0], func, true);
}
if (elm.__events && elm.__events[name]) {
var i = indexOf.call(elm.__events[name], func);
if (i > -1) elm.__events[name].splice(i, 1);
}
}
elm = null;
}
function removeClass(elms, className) {
forEach.call(elms, function (ii) {
if(!ii) return;
ii.className = distinct(
filter.call(
(ii.className || '').split(whitespace),
function (jj) { return jj != className; }
)
).join(' ');
});
}
function distinct(arr) {
var hash = {};
forEach.call(arr, function (ii) {
hash[ii] = true;
});
return Object_keys(hash);
}
function addClass(elms, className) {
forEach.call(elms, function (ii) {
if(!ii) return;
var classes = (ii.className || '').split(' ');
classes.push(className);
ii.className = distinct(classes).join(' ');
});
}
function removeSelector(elms, selector){
var which = selector.substr(0, 1);
selector = selector.substr(1);
if(which === '.') removeClass(elms, selector);
else if(which === '#') forEach.call(elms, function(elm){ elm.attributes.removeNamedItem('id'); });
}
function addSelector(elms, selector){
var which = selector.substr(0, 1);
selector = selector.substr(1);
if(which === '.') addClass(elms, selector);
else if(which === '#') forEach.call(elms, function(elm){ elm.id = selector; });
}
function testSelector(selector, state, finished) {
var elms = state.elms[selector] || [];
removeSelector(elms, selector);
if(state.beforeTest) state.beforeTest({ elms: elms, selector: selector });
stress(state, state.times, function (time) {
addSelector(elms, selector);
if (selector == baselineName) {
state.baseTime = time;
} else {
state.results[selector] = {
length: elms.length,
children: getChildren(elms).length,
time: time,
delta: time - state.baseTime
};
if(state.afterTest) {
state.afterTest({ elms: elms, selector: selector, result: state.results[selector] });
}
}
finished(selector, time);
});
}
function stress(state, times, finish) {
var now = +new Date,
lock = false,
work = state.work || function () {
lock = false;
window.scrollTo(0, times % 2 === 0 ? 100 : 0);
//log(times, 'scrolling', times % 2 === 0 ? 'down' : 'up');
};
times *= 2; //each test consists of scrolling down, and then back up
bind(window, 'scroll.stressTest', function () {
if(lock) return; //prevent multiple events
lock = true;
if (--times > 0 && !state.cancel) {
//log('again!');
setTimeout(work, 0);
} else {
setTimeout(function(){
//Safari can't unbind from within the bound function
unbind(window, 'scroll.stressTest');
finish((+new Date) - now);
}, 0);
}
});
work();
}
function extend (a, b, copy) {
b = b || {};
forEach.call(Object_keys(a), function(key){
if(copy || !b.hasOwnProperty(key))
b[key] = a[key];
});
return b;
}
function stressTest(state) {
state = extend({
times: 0, beforeTest: null, afterTest: null,
elms: indexElements(state.all), results: {}, finish: null
}, state);
//the first test scrolls down
window.scrollTo(0, 0);
var queue = state.queue = Object_keys(state.elms),
testfinish = function (className, time) {
if (queue.length > 0 && !state.cancel) {
testSelector(queue.shift(), state, testfinish);
} else {
unbind(document, 'keydown.stressTest');
if (state.finish) state.finish();
}
};
bind(document, 'keydown.stressTest', function (e) {
if (e.keyCode == 27) state.cancel = true;
});
/* figure out how many tests to run */
state.times = 15;
testSelector(baselineName, state, function (c, time) {
state.times = Math.round(15*3/time*750); //each selector should take at least 750ms*3 to run
testSelector(baselineName, state, testfinish);
});
}
function formatNumber(number, leading, trailing){
leading = leading || 0;
trailing = trailing || 2;
var parts = (number+'.').split('.');
while(parts[0].length<leading) parts[0] = '0' + parts[0];
if(trailing < 1) parts[1] = '';
else if(parts[1].length > trailing) parts[1] = parts[1].substr(0, trailing);
else while(parts[1].length < trailing) parts[1] += '0';
return parts[0] + (parts[1].length > 0 ? ('.' + parts[1]) : '');
}
function showReport(state, report){
var log = '<table><thead><tr><th>Selector</th><th># Elms.</th><th># Child.</th><th> </th><th>Delta</th><th>Total</th></tr></thead>',
all = Object_keys(state.results),
worst = all.sort(function (a, b) {
return state.results[a].time - state.results[b].time;
}).slice(0, 20);
forEach.call(worst, function (ii) {
log += '<tr><td>Removing <strong style="font:12px monospace">' + ii +
'</strong></td><td style="text-align:right; font:12px monospace">' + state.results[ii].length + '</td><td style="text-align:right; font:12px monospace">' + state.results[ii].children +
'</td><td style="text-align:right">' + (state.results[ii].delta < 0 ? '<span style="color:red">saves</span>' : '<span style="color:green">adds</span>') +
'</td><td style="text-align:right; font:12px monospace">' + formatNumber(Math.abs(state.results[ii].delta)/state.times) + 'ms</td><td style="text-align:right; font:12px monospace">' +
formatNumber(state.results[ii].time/state.times) + 'ms</td></tr>\n';
});
log += '</table><hr/><table><tr><td style="text-align:right">Selectors Tested:</td><td style="font:12px monospace">' + all.length + '</td></tr>' +
'<tr><td style="text-align:right">Baseline Time:</td><td style="font:12px monospace">' + formatNumber(state.baseTime/state.times) + 'ms</td></tr>' +
'<tr><td style="text-align:right">Num. Tests:</td><td style="font:12px monospace">' + state.times + '</td></tr>';
if(filter.call(all, function(cn){
return state.results[cn].time <= 15;
}).length) {
log += '<tr><td style="color:red; text-align:right;font-weight:bold">Warning:</td><td>Increase the number<br />of tests to get more<br />accurate results</td></tr>';
}
report.innerHTML = log + '</table>';
forEach.call(
getChildren(report, 'td th'),
function (td) {
style(td, {
padding: 1,
verticalAlign: 'top',
whiteSpace: 'nowrap',
fontSize: 12
});
}
);
}
stressTest.bind = bind;
stressTest.unbind = unbind;
stressTest.bookmarklet = function () {
if(stressTest.report) stressTest.report.close();
//var num = prompt('How many tests would you like to run (# stress tests per selector)?', 5);
//if (num > 0) {
var reportHolder = document.createElement('iframe'),
block = document.createElement('iframe');
extend({
//name: 'report' + Math.random().toString().substr(2),
scrolling: 'no',
frameBorder: 'no'
}, reportHolder, true);
document.body.appendChild(reportHolder);
reportHolder.doc = reportHolder.contentDocument || reportHolder.contentWindow.document;
reportHolder.doc.write('<html><head></head><body></body></html>');
reportHolder.doc.close();
var report = reportHolder.doc.createElement('div'),
close = reportHolder.doc.createElement('a'),
state = {
//times: num,
finish: function(){
if(this.cancel) reportHolder.close();
else showReport(this, report);
},
beforeTest: function(e) {
var l = this.queue.length;
report.innerHTML = 'Testing <strong>' + e.selector +
'</strong><br/>' + l + ' test' + (l===1?'':'s') + ' remain';
},
all: getChildren(document)
};
reportHolder.resize = function(){
var body = reportHolder.doc.body;
style(reportHolder, {
width: body.scrollWidth,
height: body.scrollHeight
});
}
setInterval(reportHolder.resize, 100);
var zIndex = 0;
forEach.call(state.all, function(elm){
var z = parseInt(elm.style.zIndex, 10);
if(!isNaN(z) && z > zIndex) zIndex = z;
});
zIndex += 99999;
style(reportHolder, {
position: 'fixed', top: 10, right: 10,
zIndex: zIndex,
background: 'white', padding: 2,
border: 'solid 2px #aaa',
width: 200, height: 40,
borderRadius: 4, boxShadow: '0 0 8px #eee'
});
style(reportHolder.doc.body, {
'font': '12px Helvetica,Arials,sans-serif',
color: '#444'
});
style(report, { whiteSpace: 'nowrap' });
close.innerHTML = '×';
style(close, {
position: 'absolute', top: 0, right: 0,
textDecoration: 'none', fontWeight: 'bold',
cursor: 'pointer', color: 'red',
fontSize: '1.3em', lineHeight: 8
});
reportHolder.close = function(){
reportHolder.parentNode.removeChild(reportHolder);
block.parentNode.removeChild(block);
unbind(close, 'click');
stressTest.report = null;
state.cancel = true;
};
bind(close, 'click', reportHolder.close);
style(block, {
height: window.screen.height * 2,
width: window.screen.width,
position: 'absolute', top: 0, left: 0,
visible: 'hidden',
zIndex: zIndex - 1
});
document.body.appendChild(block);
reportHolder.doc.body.appendChild(close);
reportHolder.doc.body.appendChild(report);
stressTest.report = reportHolder;
stressTest(state);
//}
}
return stressTest;
})();