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OMetaJS is a JavaScript implementation of the OMeta, an object-oriented language for pattern matching.

This is a node.js module for developing and using such pattern matching grammars.

$ curl http://npmjs.org/install.sh | sh

$ [sudo] npm install ometajs -g

Note: If you are using ometajs programatically you should not install it globally.

$ cd /path/to/your/project
$ npm install ometajs

$ ometajs2js --help

Usage:
  ometajs2js [OPTIONS] [ARGS]


Options:
  -h, --help : Help
  -v, --version : Version
  -i INPUT, --input=INPUT : Input file (default: stdin)
  -o OUTPUT, --output=OUTPUT : Output file (default: stdout)
  --root=ROOT : Path to root module (default: ometajs)

ometajs2js will take input *.ometajs file and produce CommonJS compatible javascript file.

Also you may require('*.ometajs') files directly without compilation. (OmetaJS is patching require.extensions as CoffeeScript does).

var ometajs = require('ometajs');

var ast = ometajs.BSJSParser.matchAll('var x = 1', 'topLevel'),
    code = ometajs.BSJSTranslator.matchAll([ast], 'trans');

Example

ometa Simple {
  top = [#simple] -> 'ok'
}

More information about OmetaJS syntax.

Fast prototyping and building your own parser/language. Processing/traversing complex AST.

Some projects that are using this:

• XJST
• ShmakoWiki
• OmetaHighlighter

To study OmetaJS or ask questions about it's core you can try to reach out original repository author Alessandro Warth or me.

Here is documented code.

• Alessandro Warth
• Takashi Yamamiya
• Sergey Berezhnoy
• Nikita Vasilyev
• Fedor Indutny