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// from https://x.com/Cody_J_Bennett/status/1818025947565584873
// demo https://jsfiddle.net/cbenn/Las0poyu

import * as THREE from "three";
import Stats from "three/addons/libs/stats.module.js";
import { OrbitControls } from "three/addons/controls/OrbitControls.js";
import { GLTFLoader } from "three/addons/loaders/GLTFLoader.js";
import { mergeVertices } from "three/addons/utils/BufferGeometryUtils.js";

THREE.ShaderChunk.skinning_pars_vertex =

yelouafi

In this tutorial we're going to build a set of parser combinators.

What is a parser combinator?

We'll answer the above question in 2 steps.

1. What is a parser?
2. and, what is a parser combinator?

So first question: What is parser?

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Algebraic Effects in JavaScript part 1 - continuations and control transfer

This is the first post of a series about Algebraic Effects and Handlers.

There are 2 ways to approach this topic:

• Denotational: explain Algebraic Effects in terms of their meaning in mathematics/Category theory
• Operational: explain the mechanic of Algebraic Effects by showing how they operate under a chosen runtime environment

Both approaches are valuables and give different insights on the topic. However, not everyone (including me), has the prerequisites to grasp the concepts of Category theory and Abstract Algebra. On the other hand, the operational approach is accessible to a much wider audience of programmers even if it doesn't provide the full picture.

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// We model the call stack using a linked list of Generators
// Each Generator has a _return field pointing back to its parent

function stepGen(gen, arg) {
    const {done, value} = gen.next(arg)
    if(done) {        
        if(gen._return) {
            stepGen(gen._return, value)
        }

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var $jscomp = $jscomp || {};
$jscomp.scope = {};
$jscomp.arrayIteratorImpl = function (h) {
  var n = 0;
  return function () {
    return n < h.length ? { done: false, value: h[n++] } : { done: true };
  };
};
$jscomp.arrayIterator = function (h) {
  return { next: $jscomp.arrayIteratorImpl(h) };

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Algebraic Effects in JavaScript part 4 - Implementing Algebraic Effects and Handlers

This is the final part of a series about Algebraic Effects and Handlers.

• Part 1 : continuations and control transfer
• Part 2 : Capturing continuations with Generators
• Part 3 : Delimited continuations
• Part 4 : Implementing Algebraic Effects and handlers

So we've come to the core topic. The reality is that we've already covered most of it in the previous parts. Especially, in the third part, where we saw delimited continuations at work.

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Algebraic Effects in JavaScript part 2 - Capturing continuations with Generators

This is the second part of a series about Algebraic Effects and Handlers.

• Part 1 : continuations and control transfer
• Part 2 : Capturing continuations with Generators
• Part 3 : Delimited continuations
• Part 4 : Algebraic Effects and handlers

Note: initially I planned a 3-part series, but since the current post on undelimited continuations ended up taking

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Algebraic Effects in JavaScript part 3 - Delimited Continuations

This is the third part of a series about Algebraic Effects and Handlers.

• Part 1 : continuations and control transfer
• Part 2 : Capturing continuations with Generators
• Part 3 : Delimited continuations
• Part 4 : Algebraic Effects and handlers

In the preceding parts, we introduced the notions of continuations and control transfer. We saw how to capture the current

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function isGenerator(x) {
  return x != null && typeof x.next === "function"
}

function isFrame(x) {
  return x != null && x._type_ === 'call_frame'
}

function call(genFunc, ...args) {

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/*
The MIT License (MIT)

Copyright (c) 2014 

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is