arcsecond
esprima
arcsecond | esprima | |
---|---|---|
4 | 8 | |
545 | 6,962 | |
- | 0.0% | |
0.0 | 0.0 | |
3 months ago | about 1 year ago | |
TypeScript | TypeScript | |
- | BSD 2-clause "Simplified" License |
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arcsecond
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Reverse engineering a proprietary USB control driver for a mechanical keyboard and building an open source equivalent
I've been working pretty hard for the last couple of years to bring a lot of these capabilities to JS/TS. Arcsecond (and it's binary extension) is a general library for parsing, which can easily take a block of memory and convert it to a workable data structure (even when that data structure is some kind of contextual union). You can use construct-js to (re)build an arbitrary byte buffer from structured data, making use of operators for sizeof and pointers.
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[Task] Convert a zero dependency 4 file typescript library into Es6 JavaScript $25
I basically need what the title says. I found a library called arcsecond that is open sourced and I want to be able to use it in a Google Apps Script environment. The environment supports ES6, so I'd like to compile all of the files into one ES6 Javascript file, with no imports.
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Practical parsing with Flex and Bison
Parser combinators are great. I also built and maintain arcsecond, which is a parser combinator library for TypeScript and JavaScript.
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construct-js: A library for creating byte level data structures written in TypeScript
It is indeed! I'm planning on adding some parsing capabilities as well (just like in python construct) - but I've actually written a much more general purpose tool for that call arcsecond which allows for defining binary and text parsers declarative.
esprima
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ESLint: under the hood
Focusing again on ESLint, the parser used by the linter is called Espree. This is an in-house parser built by the ESLint folks to fully support ECMAScript 6 and JSX on top of the already existing Esprima. The Espree module provide APIs for both tokenization and parsing that you can easily test out.
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Why you don’t need TypeScript
For TypeScript we have used AST transforms from their compiler API, and for plain JavaScript we did a similar thing using ESPrima. This helped us implement some simple optimizations like stream fusion (combining .filter and .map into a single operation) or avoiding extra object allocations in vector math, which led to nice performance improvements in code that does heavy computation (we process large amounts of data on the server and store results of physics simulations).
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Algorithm to simplify a 100-variable Boolean expression?
I used ESPrima, but any parser would do in this case. I then wrote a simple function to extract all "atomic" non-boolean expressions from it.
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How to make your own programming language in JavaScript
AST is an acronym for Abstract Syntax Tree. It's the way to represent code in a format that tools can understand. Usually in form of tree data structure. We will use AST in the format of an Esprima, which is a JavaScript parser that outputs AST.
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What the heck is an Abstract Syntax Tree (AST) ?
esprima
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Abstract Syntax Trees: They're Actually Used Everywhere -- But What Are They?
Create an AST: Esprima
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We Switched from Webpack to Vite
The thread was originally about CRA vs Vite size on disk (or implicitly, if we're applying it to real world applications, network cost in CI job startup times). And like I said, surrogate pairs don't apply to ASCII.
See this[0] for reference. Note how the first byte must fall within a certain range in order to signal being a surrogate pair. This fact is taken advantage of by JS parsers to make parsing of ASCII code faster by special casing that range, since checking for a valid character in the entire unicode range is quite a bit more expensive[1].
[0] https://github.com/jquery/esprima/blob/0911ad869928fd218371b...
[1] https://github.com/jquery/esprima/blob/0911ad869928fd218371b...
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How to create your own language that compile to JavaScript
If you want to learn more about parsing, reading the code of an actual recursive parser might be a better idea. Esprima is a decent place to start if you're interested in JS grammar. Then you can look at the babel handbook to learn more about AST transformations. From there, the literature gets quite a bit more heavy. If you get this far and are willing to push further, you'll probably want to grab yourself a copy of the dragon book at a minimum.
What are some alternatives?
construct-js - 🛠️A library for creating byte level data structures.
estree - The ESTree Spec
parser-demo - Good source layout with Flex and Bison
babel-handbook - :blue_book: A guided handbook on how to use Babel and how to create plugins for Babel.
arcsecond-binary - Binary parsers for arcsecond!
estraverse - ECMAScript JS AST traversal functions
esbuild-loader - Webpack loader for esbuild: Speed up your build ⚡️
escodegen - ECMAScript code generator
vite-plugin-vue2 - Vue2 plugin for Vite
Visual Studio Code - Visual Studio Code
vike - 🔨 Like Next.js / Nuxt but as do-one-thing-do-it-well Vite plugin.
jscodeshift - A JavaScript codemod toolkit.