Jison issues discuss 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 Jison can be installed for Node using npm Using npm: npm install jison -g Usage from the command line Clone the github repository for examples: git clone git://github.com/zaach/jison.git cd jison/examples Now you're ready to generate some parsers: jison calculator.jison This will generate calculator.js in your current working directory. This file can be used to parse an input file, like so: echo "2^32 / 1024" > testcalc node calculator.js testcalc This will print out 4194304. Full cli option list: Usage: jison [file] [lexfile] [options] file file containing a grammar lexfile file containing a lexical grammar Options: -j, --json force jison to expect a grammar in JSON format -o FILE, --outfile FILE Filename and base module name of the generated parser -t, --debug Debug mode -m TYPE, --module-type TYPE The type of module to generate (commonjs, amd, js) -p TYPE, --parser-type TYPE The type of algorithm to use for the parser (lr0, slr, lalr, lr) -V, --version print version and exit Usage from a CommonJS module You can generate parsers programatically from JavaScript as well. Assuming Jison is in your commonjs environment's load path: // mygenerator.js var Parser = require("jison").Parser; // a grammar in JSON var 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 var parser = new Parser(grammar); // generate source, ready to be written to disk var parserSource = parser.generate(); // you can also use the parser directly from memory // returns true parser.parse("adfe34bc e82a"); // throws lexical error parser.parse("adfe34bc zxg"); 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.