pvdz’s gists

pvdz / gist:9121613

Created February 20, 2014 19:41

for-in rewrite rules.

	// var version, can only have one var with a limited initializer
	// can safely reuse the new var because it can't have side effects
	for (var key=init in o) stmt;
	// =>
	var key = init, _γ_keys = [], _γ_expro = expr;
	for (key in _γ_expro) _γ_keys.push(key);
	while (_γ_keys.length) if (expro.hasOwnProperty(key = _γ_keys.shift())) stmt;

	// non-var version, lhs can be any single expression
	// we have to create our own temp var because lhs is not "safe"

pvdz / gist:9121615

Created February 20, 2014 19:41

for-in rewrite rules.

	// var version, can only have one var with a limited initializer
	// can safely reuse the new var because it can't have side effects
	for (var key=init in o) stmt;
	// =>
	var key = init, _γ_keys = [], _γ_expro = expr;
	for (key in _γ_expro) _γ_keys.push(key);
	while (_γ_keys.length) if (expro.hasOwnProperty(key = _γ_keys.shift())) stmt;

	// non-var version, lhs can be any single expression
	// we have to create our own temp var because lhs is not "safe"

pvdz / gist:9890540

Created March 31, 2014 11:44

random golf example

	var q = Math,
	r = 2 * q.PI,
	w = q.sin,
	x = q.pow,
	y = q.max,
	Q = q.sqrt;

	// =>

	var q=Math,w=q.sin,x=q.pow,y=q.max,Q=q.sqrt,r=2*q.PI;

pvdz / gist:75079c33184499910319

Created June 9, 2014 23:47

	function this_tok_mustBeString(str, nextIsExpr){
	if (this_tok_getLastValue() === str) return this_tok_next(nextIsExpr);
	this_tok_throwSyntaxError('Expecting current value to be ['+str+'] is ['+this_tok_getLastValue()+']');
	}

	==>

	var this_tok_returnIsYield = false;
	function this_tok_mustBeString(str, nextIsExpr){
	var tag = 'start';

pvdz / gist:51ef6936eef0dc87a19d

Created June 11, 2014 00:05

	function this_par_parseCatch(inFunction, inLoop, inSwitch, labelSet){
	if (this_tok_nextPuncIfString('catch')) {
	var type = this_tok_mustBeNum(0x28, false);

	if (type === 13) {
	if (this_par_isReservedIdentifier(false)) this_tok_throwSyntaxError('Catch scope var name is reserved');
	this_tok_next(false);
	} else {
	this_tok_throwSyntaxError('Missing catch scope variable');
	}

pvdz / gist:15a1765d2127b693e040

Created June 11, 2014 18:20

Silly example to add numbers to 5, before processing

	var yielding = false;
	function this_makeFive(n){
	if (n === 3) return this_addOne(n)+1;
	else if (n === 1) return this_addThree(n)+1;
	else throw 'invalid input, can only hand 1 and 3';
	}

	function this_addThree(n){
	return this_addOne(n) + 2;
	}

pvdz / gist:1b75c28f3a5adfca11a5

Created June 11, 2014 18:21

Silly example to add numbers to 5, after processing, beautified (ugly artifacts left in intentionally because, well, idc)

	var yielding = false;
	function this_makeFive(n){
	var step = 1;
	var v1, v0;
	var f1, f0;
	return function(){
	while (true) {
	switch (step) {
	case 1:
	if (n === 3);

pvdz / gist:f33a51dc7189d98efe23

Created July 3, 2014 10:31

Right now the sub is never fired. If you uncomment the first line, both subs are fired.

	// PubSub.subscribe('foo', function(name, value) {});
	PubSub.publish('foo', 'bar');
	PubSub.subscribe('foo', function(name, value) {});

pvdz / animworker.js

Last active August 29, 2015 14:07

Creating animated gif. Demonstrates web worker lag after some frames unless respawned. For other deps see https://github.com/antimatter15/jsgif

	importScripts('gifencoder/LZWEncoder.js', 'gifencoder/NeuQuant.js', 'gifencoder/GIFEncoder.js');

	self.onmessage = function(event) {
	//console.log("message!");
	//alert("message");
	//self.postMessage(event.data);

	var frame_index = event.data.frame_index;
	var frame_length = event.data.frame_length;
	var height = event.data.height;

pvdz / gist:3cccc4f36c8319e09bb7

Created January 29, 2015 20:18

JS1k 2015 bare shim. This is loaded in an iframe dynamically. You can opt for an empty DOM during submit, a 2d canvas, or a webgl canvas. You can also specify max canvas width/height during submit, defaults to 100%. If empty, `a`, `c`, and `g` will obviously not exist. `top.reload()` replaces the iframe containing your demo with a new instance, …

	<!doctype html>
	<html style="margin: 0; padding: 0; border: 0; width: 100%; height: 100%;">
	<head>
	<meta charset="utf-8">
	</head>
	<body style="margin: 0; padding: 0; border: 0; width: 100%; height: 100%;">
	<canvas style="display: block; width: WIDTHpx; height: HEIGHTpx;" width="WIDTH" height="HEIGHT"></canvas>
	<script>
	// shim...
	var a = canvas;

Peter van der Zee pvdz