PEG.js
nearley
| PEG.js | nearley | |
|---|---|---|
| 8 | 3 | |
| 4,755 | 3,548 | |
| 0.0% | - | |
| 0.0 | 0.0 | |
| over 2 years ago | 8 months ago | |
| JavaScript | JavaScript | |
| MIT License | MIT License |
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PEG.js
- Peg.js: Parser Generator for JavaScript
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How do you start your own programming language?
Here's a javascript library that lets you generate your own language that compiles to Javascript. https://pegjs.org/ It's a compiler generator. You can either use the command line tool and feed it your grammar (You have to write that) and use the generated parser.js which can then run your program, or use peg.js as a dependency and generate your parser at run time before feeding it your program.
- My first Vue app - Subtitle offset editor
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Deno in 2022
The library they're having trouble with is the most common parser generator in javascript, peg.js, which has about 80% of the market
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UX mockups with TEXT (markdown)
Currently, I have only POC the grammar and language and parser are created using https://pegjs.org/
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PEG Parsers: sometimes more appropriate than Regex
In past blog posts, where I've written about PEG, I've used Parsimonious in Python, such as three of my solutions to the 2020 Advent Of Code challenges (here, (here)[https://dev.to/meseta/advent-of-code-day-18-finally-using-peg-grammar-in-python-in-the-way-it-s-supposed-to-3253], and (here)[https://dev.to/meseta/advent-of-code-day-19-abusing-peg-grammar-in-python-the-way-it-s-not-supposed-to-2beg]). This time, because the rest of the website is javascript, I will be using PEG.js instead to avoid adding an extra programming language to the codebase.
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Formal Logic Rules for a computer-assisted RPG
Update: I started writing a grammar for this language in PEG using PEG.js. This was super fun, I'll take a stab at an interpreter next, that should be much harder.
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I'd like to ask you guys a question, how or in what way is a Programming Language made?
I was going to post the same thing. This really helped me understand the concepts better back in the day. They also have examples for some popular languages on their github: https://github.com/pegjs/pegjs/tree/master/examples
nearley
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Writing a C compiler in 500 lines of Python
While I suspect I would learn more writing a tokenizer and parsing logic myself I find grammars much easier to read and maintain.
ANTLR is pretty good and is supported across several languages and something I had previously used for some quick Elasticsearch query syntax munging in Python. It also means you can often start from an already existing grammar.
The JS version of ANTLR didn't seem to work for me so for the SQL/JSONPath stuff ended up using the Moo lever and Nearly parser which was rather pleasant. https://nearley.js.org
- Parser generators vs. handwritten parsers: surveying major languages in 2021
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Applicative Parsing
Parsers in nearley.js [1] are written in a very readable EBNF-like DSL; then they get desugared down to a JS file that's a lot like your snippet.
[1] https://github.com/kach/nearley
What are some alternatives?
peggy - Peggy: Parser generator for JavaScript
Jison - Bison in JavaScript.
Chevrotain - Parser Building Toolkit for JavaScript
js-yaml - JavaScript YAML parser and dumper. Very fast.
markdown-it - Markdown parser, done right. 100% CommonMark support, extensions, syntax plugins & high speed
xml2js - XML to JavaScript object converter.
parse5 - HTML parsing/serialization toolset for Node.js. WHATWG HTML Living Standard (aka HTML5)-compliant.
csv-parser - Streaming csv parser inspired by binary-csv that aims to be faster than everyone else
neat-csv - Fast CSV parser