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<title>Esprima</title>
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<li><a href="index.html">&larr; Home</a></li>
<li><a href="http://github.com/ariya/esprima">Code</a></li>
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<li><a href="http://issues.esprima.org">Issues</a></li>
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<h1>Esprima <small>ECMAScript parsing infrastructure for multipurpose analysis</small></h1>
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<p>Esprima (<a href="http://esprima.org">esprima.org</a>) is an educational
<a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">ECMAScript</a>
(also popularly known as <a href="http://en.wikipedia.org/wiki/JavaScript">JavaScript</a>)
parsing infrastructure for multipurpose analysis. It is also written in ECMAScript.</p>
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<p>Esprima serves as a good basis for various tools such as source modification
(<a href="https://github.com/ariya/esmorph">Esmorph</a>), coverage analyzer
(<a href="https://github.com/itay/node-cover">node-cover</a> and
<a href="https://github.com/coveraje/coveraje">coveraje</a>),
source-to-source compiler (<a href="https://github.com/Yoric/Marv-the-Tinker">Marv</a>),
syntax formatter (<a href="https://github.com/fawek/codepainter">Code Painter</a>),
and code generator (<a href="https://github.com/Constellation/escodegen">escodegen</a>).
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<p>Esprima can be used in a web browser:</p>
<pre>&lt;script src="esprima.js"&gt;&lt;script&gt;</pre>
<p>or in a Node.js application via the package manager:</p>
<pre>npm install esprima</pre>
<p>Esprima parser output is compatible with Mozilla (SpiderMonkey)
<a href="https://developer.mozilla.org/en/SpiderMonkey/Parser_API">Parser API</a>.</p>
<p>A very simple example:</p>
<pre>esprima.parse('var answer=42').body[0].declarations[0].init</pre>
<p>produces the following object:</p>
<pre>{ type: 'Literal', value: 42 }</pre>
<p>Esprima is still in the development, for now please check
<a href="http://wiki.esprima.org">the wiki documentation</a>.</p>
<p>Since it is not comprehensive nor complete, refer to the
<a href="http://issues.esprima.org">issue tracker</a> for
<a href="http://code.google.com/p/esprima/issues/list?q=Defect">known problems</a>
and <a href="http://code.google.com/p/esprima/issues/list?q=Enhancement">future plans</a>.
Esprima is supported on <a href="http://code.google.com/p/esprima/wiki/BrowserCompatibility">many browsers</a>:
IE 6+, Firefox 1+, Safari 3+, Chrome 1+, and Opera 8+.</p>
<p>Feedback and contribution are welcomed! Please join the
<a href="http://groups.google.com/group/esprima">mailing list</a> and read the
<a href="http://code.google.com/p/esprima/wiki/ContributionGuide">contribution guide</a>
for further info.</p>
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<h3>Useful demos</h3>
<ul>
<li><a href="demo/parse.html">Code parser</a></li>
<li><a href="demo/precedence.html">Operator precedence</a></li>
<li><a href="demo/collector.html">Regex collector</a></li>
<li><a href="demo/functiontrace.html">Function tracing</a></li>
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<li><a href="demo/rewrite.html">Source rewrite</a></li>
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<h3>Harness tests</h3>
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<li><a href="test/index.html">Unit tests</a></li>
<li><a href="test/compat.html">Compatibility tests</a></li>
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<li><a href="test/coverage.html">Coverage analysis</a></li>
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<h3>Need for speed</h3>
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<li><a href="test/benchmarks.html">Benchmarks suite</a></li>
<li><a href="test/compare.html">Speed comparison</a></li>
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<div class="footer"><strong>Esprima</strong> is created by
<a href="http://ariya.ofilabs.com/about" target="_blank">Ariya Hidayat</a>. Follow <a href="http://twitter.com/ariyahidayat">@ariyahidayat</a> on Twitter.
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