Jison (remastered)

This is a fork of Jison parser generator by Zach Carter.

The difference:

• Removed web site sources
• Removed CLI & bundling. Those things may back in the future but in a brand new way
• Removed generator methods except generateModule
• Refactored to use ES6+ features, remove redundant abstractions, minor bug fixes
• Features:
  • Added support for function patterns in lexer
  • Added packTable option for parser generateModule() method (parser.generateModule("esm", { packTable: "advanced" })), to employ a more sophisticated approach for packing BNF table, this is useful for large tables to reduce tens of kilobytes down to just a few kilobytes

An API for creating parsers in JavaScript

Jison generates bottom-up parsers in JavaScript. Its API is similar to Bison's, hence the name. It supports many of Bison's major features, plus some of its own. If you are new to parser generators such as Bison, and Context-free Grammars in general, a good introduction is found in the Bison manual. If you already know Bison, Jison should be easy to pickup.

Briefly, Jison takes a JSON encoded grammar or Bison style grammar and outputs a JavaScript file capable of parsing the language described by that grammar. You can then use the generated script to parse inputs and accept, reject, or perform actions based on the input.

Installation

    npm install @lahmatiy/jison

Usage

// mygenerator.js
const { Parser } = require('jison');

// a grammar in JSON
const grammar = {
    lex: {
        rules: [
           ['\\s+', '/* skip whitespace */'],
           ['[a-f0-9]+', 'return "HEX";']
        ]
    },

    bnf: {
        hex_strings: [
            'hex_strings HEX', 'HEX'
        ]
    }
};

// `grammar` can also be a string that uses jison's grammar format
const parser = new Parser(grammar);

// now you can use the parser directly from memory
// returns true
parser.parse("adfe34bc e82a");

// throws lexical error
parser.parse("adfe34bc zxg");

// ... or generate source code of parser
const parserSource = parser.generateModule();

More Documentation

For more information on creating grammars and using the generated parsers, read the documentation.

How to contribute

See CONTRIBUTING.md for contribution guidelines, how to run the tests, etc.

Projects using Jison

View them on the wiki, or add your own.

Contributors

Githubbers

Special thanks to Jarred Ligatti, Manuel E. Bermúdez

License

Copyright (c) 2009-2014 Zachary Carter

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.