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/*global coverage, ENABLE_PERFORMANCE, NODE_ENV*/
/*eslint no-console:0*/
/** @jsx h */
let { h, Component, render } = require(NODE_ENV==='production' ? '../../dist/preact.min.js' : '../../src/preact');
const MULTIPLIER = ENABLE_PERFORMANCE ? (coverage ? 5 : 1) : 999999;
let now = typeof performance!=='undefined' && performance.now ? () => performance.now() : () => +new Date();
function loop(iter, time) {
let start = now(),
count = 0;
while ( now()-start < time ) {
count++;
iter();
}
return count;
}
function benchmark(iter, callback) {
let a = 0;
function noop() {
try { a++; } finally { a += Math.random(); }
}
// warm
for (let i=3; i--; ) noop(), iter();
let count = 5,
time = 200,
passes = 0,
noops = loop(noop, time),
iterations = 0;
function next() {
iterations += loop(iter, time);
setTimeout(++passes===count ? done : next, 10);
}
function done() {
let ticks = Math.round(noops / iterations * count),
hz = iterations / count / time * 1000,
message = `${hz|0}/s (${ticks} ticks)`;
callback({ iterations, noops, count, time, ticks, hz, message });
}
next();
}
describe('performance', function() {
let scratch;
this.timeout(10000);
before( () => {
if (coverage) {
console.warn('WARNING: Code coverage is enabled, which dramatically reduces performance. Do not pay attention to these numbers.');
}
scratch = document.createElement('div');
(document.body || document.documentElement).appendChild(scratch);
});
beforeEach( () => {
scratch.innerHTML = '';
});
after( () => {
scratch.parentNode.removeChild(scratch);
scratch = null;
});
it('should rerender without changes fast', done => {
let jsx = (
<div class="foo bar" data-foo="bar" p={2}>
<header>
<h1 class="asdf">a {'b'} c {0} d</h1>
<nav>
<a href="/foo">Foo</a>
<a href="/bar">Bar</a>
</nav>
</header>
<main>
<form onSubmit={()=>{}}>
<input type="checkbox" checked={true} />
<input type="checkbox" checked={false} />
<fieldset>
<label><input type="radio" checked /></label>
<label><input type="radio" /></label>
</fieldset>
<button-bar>
<button style="width:10px; height:10px; border:1px solid #FFF;">Normal CSS</button>
<button style="top:0 ; right: 20">Poor CSS</button>
<button style="invalid-prop:1;padding:1px;font:12px/1.1 arial,sans-serif;" icon>Poorer CSS</button>
<button style={{ margin:0, padding:'10px', overflow:'visible' }}>Object CSS</button>
</button-bar>
</form>
</main>
</div>
);
let root;
benchmark( () => {
root = render(jsx, scratch, root);
}, ({ ticks, message }) => {
console.log(`PERF: empty diff: ${message}`);
expect(ticks).to.be.below(350 * MULTIPLIER);
done();
});
});
it('should rerender repeated trees fast', done => {
class Header extends Component {
render() {
return (
<header>
<h1 class="asdf">a {'b'} c {0} d</h1>
<nav>
<a href="/foo">Foo</a>
<a href="/bar">Bar</a>
</nav>
</header>
);
}
}
class Form extends Component {
render() {
return (
<form onSubmit={()=>{}}>
<input type="checkbox" checked={true} />
<input type="checkbox" checked={false} />
<fieldset>
<label><input type="radio" checked /></label>
<label><input type="radio" /></label>
</fieldset>
<ButtonBar />
</form>
);
}
}
class ButtonBar extends Component {
render() {
return (
<button-bar>
<Button style="width:10px; height:10px; border:1px solid #FFF;">Normal CSS</Button>
<Button style="top:0 ; right: 20">Poor CSS</Button>
<Button style="invalid-prop:1;padding:1px;font:12px/1.1 arial,sans-serif;" icon>Poorer CSS</Button>
<Button style={{ margin:0, padding:'10px', overflow:'visible' }}>Object CSS</Button>
</button-bar>
);
}
}
class Button extends Component {
render(props) {
return <button {...props} />;
}
}
class Main extends Component {
render() {
return <Form />;
}
}
class Root extends Component {
render() {
return (
<div class="foo bar" data-foo="bar" p={2}>
<Header />
<Main />
</div>
);
}
}
class Empty extends Component {
render() {
return <div />;
}
}
class Parent extends Component {
render({ child:C }) {
return <C />;
}
}
let root;
benchmark( () => {
root = render(<Parent child={Root} />, scratch, root);
root = render(<Parent child={Empty} />, scratch, root);
}, ({ ticks, message }) => {
console.log(`PERF: repeat diff: ${message}`);
expect(ticks).to.be.below(2000 * MULTIPLIER);
done();
});
});
it('should construct large VDOM trees fast', done => {
const FIELDS = [];
for (let i=100; i--; ) FIELDS.push((i*999).toString(36));
let out = [];
function digest(vnode) {
out.push(vnode);
out.length = 0;
}
benchmark( () => {
digest(
<div class="foo bar" data-foo="bar" p={2}>
<header>
<h1 class="asdf">a {'b'} c {0} d</h1>
<nav>
<a href="/foo">Foo</a>
<a href="/bar">Bar</a>
</nav>
</header>
<main>
<form onSubmit={()=>{}}>
<input type="checkbox" checked />
<input type="checkbox" />
<fieldset>
{ FIELDS.map( field => (
<label>
{field}:
<input placeholder={field} />
</label>
)) }
</fieldset>
<button-bar>
<button style="width:10px; height:10px; border:1px solid #FFF;">Normal CSS</button>
<button style="top:0 ; right: 20">Poor CSS</button>
<button style="invalid-prop:1;padding:1px;font:12px/1.1 arial,sans-serif;" icon>Poorer CSS</button>
<button style={{ margin:0, padding:'10px', overflow:'visible' }}>Object CSS</button>
</button-bar>
</form>
</main>
</div>
);
}, ({ ticks, message }) => {
console.log(`PERF: large VTree: ${message}`);
expect(ticks).to.be.below(2000 * MULTIPLIER);
done();
});
});
});
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