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| r789 | **Esprima** ([esprima.org](http://esprima.org)) is a high performance, | |||
| standard-compliant [ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm) | ||||
| parser written in ECMAScript (also popularly known as | ||||
| [JavaScript](http://en.wikipedia.org/wiki/JavaScript>JavaScript)). | ||||
| Esprima is created and maintained by [Ariya Hidayat](http://twitter.com/ariyahidayat), | ||||
| with the help of [many contributors](https://github.com/ariya/esprima/contributors). | ||||
| Esprima runs on web browsers (IE 6+, Firefox 1+, Safari 3+, Chrome 1+, Konqueror 4.6+, Opera 8+) as well as | ||||
| [Node.js](http://nodejs.org). | ||||
| ### Features | ||||
| - Full support for [ECMAScript 5.1](http://www.ecma-international.org/publications/standards/Ecma-262.htm)(ECMA-262) | ||||
| - Sensible [syntax tree format](http://esprima.org/doc/index.html#ast) compatible with Mozilla | ||||
| [Parser AST](https://developer.mozilla.org/en/SpiderMonkey/Parser_API) | ||||
| - Heavily tested (> 550 [unit tests](http://esprima.org/test/) with solid 100% statement coverage) | ||||
| - Optional tracking of syntax node location (index-based and line-column) | ||||
| - Experimental support for ES6/Harmony (module, class, destructuring, ...) | ||||
| Esprima is blazing fast (see the [benchmark suite](http://esprima.org/test/benchmarks.html)). | ||||
| It is up to 3x faster than UglifyJS v1 and it is still [competitive](http://esprima.org/test/compare.html) | ||||
| with the new generation of fast parsers. | ||||
| ### Applications | ||||
| Esprima serves as the basis for many popular JavaScript development tools: | ||||
| - Code coverage analysis: [node-cover](https://github.com/itay/node-cover), [Istanbul](https://github.com/yahoo/Istanbul) | ||||
| - Documentation tool: [JFDoc](https://github.com/thejohnfreeman/jfdoc), [JSDuck](https://github.com/senchalabs/jsduck) | ||||
| - Language extension: [LLJS](http://mbebenita.github.com/LLJS/) (low-level JS), | ||||
| [Sweet.js](http://sweetjs.org/) (macro) | ||||
| - ES6/Harmony transpiler: [Six](https://github.com/matthewrobb/six), [Harmonizr](https://github.com/jdiamond/harmonizr) | ||||
| - Eclipse Orion smart editing ([outline view](https://github.com/aclement/esprima-outline), [content assist](http://contraptionsforprogramming.blogspot.com/2012/02/better-javascript-content-assist-in.html)) | ||||
| - Source code modification: [Esmorph](https://github.com/ariya/esmorph), [Code Painter](https://github.com/fawek/codepainter), | ||||
| - Source transformation: [node-falafel](https://github.com/substack/node-falafel), [Esmangle](https://github.com/Constellation/esmangle), [escodegen](https://github.com/Constellation/escodegen) | ||||
| ### Questions? | ||||
| - [Documentation](http://esprima.org/doc) | ||||
| - [Issue tracker](http://issues.esprima.org): [known problems](http://code.google.com/p/esprima/issues/list?q=Defect) | ||||
| and [future plans](http://code.google.com/p/esprima/issues/list?q=Enhancement) | ||||
| - [Mailing list](http://groups.google.com/group/esprima) | ||||
| - [Contribution guide](http://esprima.org/doc/index.html#contribution) | ||||
| Follow [@Esprima](http://twitter.com/Esprima) on Twitter to get the | ||||
| development updates. | ||||
| Feedback and contribution are welcomed! | ||||
| ### License | ||||
| Copyright (C) 2012, 2011 [Ariya Hidayat](http://ariya.ofilabs.com/about) | ||||
| and other contributors. | ||||
| Redistribution and use in source and binary forms, with or without | ||||
| modification, are permitted provided that the following conditions are met: | ||||
| * Redistributions of source code must retain the above copyright | ||||
| notice, this list of conditions and the following disclaimer. | ||||
| * Redistributions in binary form must reproduce the above copyright | ||||
| notice, this list of conditions and the following disclaimer in the | ||||
| documentation and/or other materials provided with the distribution. | ||||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||||
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||||
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||||
| ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY | ||||
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||||
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||||
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | ||||
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||||
| THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||||