PEG.js - Grammar language

PEG.js is an open source grammar language created in 2010 by David Majda.

#181on PLDB

14Years Old

72Repos

Download source code:

git clone https://github.com/pegjs/pegjs

PEG.js is a simple parser generator for JavaScript that produces fast parsers with excellent error reporting. You can use it to process complex data or computer languages and build transformers, interpreters, compilers and other tools easily.

Tags: grammarLanguage
PEG.js is developed on GitHub and has 4,802 stars
There are at least 72 PEG.js repos on GitHub
Early development of PEG.js happened in https://github.com/pegjs
PEG.js compiles to JavaScript
PEG.js is written in JavaScript, Markdown, CSS, JSON, TypeScript, HTML, YAML
The Google BigQuery Public Dataset GitHub snapshot shows 63 users using PEG.js in 63 repos on GitHub

Example from the web:

start
 = additive

additive
  = left:multiplicative "+" right:additive { return left + right; }
  / multiplicative

multiplicative
  = left:primary "*" right:multiplicative { return left * right; }
  / primary

primary
  = integer
  / "(" additive:additive ")" { return additive; }

integer "integer"
  = digits:[0-9]+ { return parseInt(digits.join(""), 10); }

Language features

Feature	Supported	Example	Token
Comments	✓	// A comment
MultiLine Comments	✓	/* A comment */	/* */
Line Comments	✓	// A comment	//
Semantic Indentation	X