nearley
PEG.js
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nearley | PEG.js | |
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3 | 8 | |
3,538 | 4,726 | |
- | 1.0% | |
0.0 | 0.0 | |
7 months ago | over 2 years ago | |
JavaScript | JavaScript | |
MIT License | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
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
PEG.js
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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.
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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
What are some alternatives?
peggy - Peggy: Parser generator for JavaScript
Jison - Bison in JavaScript.
js-yaml - JavaScript YAML parser and dumper. Very fast.
Chevrotain - Parser Building Toolkit for JavaScript
markdown-it - Markdown parser, done right. 100% CommonMark support, extensions, syntax plugins & high speed
csv-parser - Streaming csv parser inspired by binary-csv that aims to be faster than everyone else
ohm - A library and language for building parsers, interpreters, compilers, etc.
parse-json - Parse JSON with more helpful errors
xml2js - XML to JavaScript object converter.