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<!DOCTYPE html>
<html lang="en">
<head>
<!--# include file="/templates/header.html" -->
<title>The Egison Programming Language</title>
<meta content="The Egison Programming Language" name="title">
<!--# include file="/templates/console-css.html" -->
</head>
<body>
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<h1>The Egison Programming Language</h1>
<h2 style="margin-bottom:20px;"> - Express Intuition Directly with Essentially New Syntax -</h2>
<p>
Egison is a programming language that features extensible efficient non-linear pattern matching with backtracking for non-free data types.<br/>
We can directly represent pattern matching for a wide range of data types including lists, multisets, sets, trees, graphs, and mathematical expressions.<br/>
Egison makes programming dramatically simple!
</p>
<textarea id="egison-program" class="haskell-code"><!--# include file="/source/sample/demo1.egi" --></textarea>
<div class="container marketing" style="color:#5a5a5a; font-size:14px; line-height:1.428571429; padding-left:0px; padding-right:0px;">
<div class="col-lg-4" style="padding:0px;">
<div class="left-col-lg-4">
<h2><i class="fa fa-key"></i> Pattern-Match-Oriented</h2>
<p>
Egison proposes a new paradigm <strong>pattern-match-oriented</strong>.
The combination of <strong>all of the following features</strong> enables intuitive powerful pattern matching.
</p>
<ul>
<li>Efficiency of the backtracking algoirthm for non-linear patterns</li>
<li>Extensibility of pattern matching</li>
<li>Polymorphisim in patterns</li>
<!--
<li>Pattern matching with lexical scoping</li>
-->
</ul>
<p>
<!--<a class="btn btn-default btn-primary" href="/concept.html" role="button">Concept of Egison Pattern Matching (5 mins)</a>-->
<a class="btn btn-default btn-github" href="https://arxiv.org/abs/1808.10603.pdf" role="button" target="_blank">Egison Pattern-Matching Paper</a>
</p>
</div>
</div><!-- /.col-lg-4 -->
<div class="col-lg-4" style="padding:0px;">
<div class="middle-col-lg-4">
<h2><i class="fa fa-table"></i> Computer Algebra System</h2>
<p>
Egison allows programmers to use <strong>tensor index notation</strong> including the support for <strong>differential forms</strong>.<br/>
Egison introduces two types of parameters, scalar and tensor parameters, and a set of simple index reduction rules for that.
</p>
<!--
<p>
When a tensor is provided to a scalar parameter, the function is applied to each component of the tensor.
When a tensor is provided to a tensor parameter, the function treats the tensor argument as a whole.
</p>
-->
<p>
<a class="btn btn-default btn-primary" href="https://www.egison.org/math/riemann-curvature-tensor-of-S2.html" role="button">Demo: Riemann Curvature Tensor of `S^2` »</a>
<!--
<a class="btn btn-default btn-primary" href="/concept2.html" role="button">Concept of Egison as CAS (5 mins)</a>
-->
<a class="btn btn-default btn-github" href="https://arxiv.org/pdf/1702.06343.pdf" role="button" target="_blank">Egison Tensor Paper</a>
</p>
</div>
</div><!-- /.col-lg-4 -->
<div class="col-lg-4" style="padding:0px;">
<div class="right-col-lg-4">
<h2><i class="fa fa-flask"></i> Online Demonstrations</h2>
<p>
Please try Egison's original features.
</p>
<ul>
<li>Pattern Matching</li>
<ul>
<li><a href="https://www.egison.org/demonstrations/poker-hands.html">Poker Hands</a></li>
<li><a href="https://www.egison.org/demonstrations/mahjong.html">Mahjong</a></li>
<li><a href="https://www.egison.org/demonstrations/primes.html">Twin Primes</a></li>
</ul>
<li>Computer Algebra System</li>
<ul>
<li><a href="https://www.egison.org/math/riemann-curvature-tensor-of-S2.html">Riemann Curvature Tensor of `S^2`</a></li>
<li><a href="https://www.egison.org/math/hodge-minkowski.html">Hodge Operator of Minkowski Space</a></li>
<li><a href="https://www.egison.org/math/hodge-laplacian-polar.html">Hodge Laplacian of Polar Coordinates</a></li>
</ul>
</ul>
</div>
</div><!-- /.col-lg-4 -->
</div>
</div>
</div>
<div class="container marketing">
<div class="row">
<div style="border-radius: 10px; background-color:#f5f5f5; border: 2px solid #222; margin-bottom:20px; padding: 10px; margin-left:15px; margin-right:15px;">
<b>[2020/04/13]</b> We've released Egison version 4.0.0!<br/>
<b>[2019/12/02]</b> <a href="/download/pmo-paper.pdf" target="_blank">Paper on pattern-match-oriented programming</a> has been accepted to <Programming> 2020!<br/>
<b>[2018/08/13]</b> <a href="https://arxiv.org/abs/1808.10603" target="_blank">Paper on the design of Egison pattern matching</a> has been accepted to APLAS 2018!<br/>
</div>
</div>
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<h2><i class="fa fa-download"></i> Installation</h2>
<a class="btn btn-default btn-github btn-lg" href="/getting-started/getting-started-mac.html" role="button" target="_blank">Mac OS X</a>
<a class="btn btn-default btn-github btn-lg" href="/getting-started/getting-started-linux.html" role="button" target="_blank">Linux</a>
<a class="btn btn-default btn-github btn-lg" href="/getting-started/getting-started-windows.html" role="button" target="_blank">Windows</a>
<h2><i class="fa fa-newspaper-o"></i> Egison Cheat Sheet</h2>
<p>
Please refer <a href="/cheatsheet.html">this cheat sheet</a> when you write Egison programs.
</p>
<a href="/cheatsheet.html"><img width="100%" src="/images/cheatsheet.png" style="border:2px;"/></a>
</div>
<div class="col-lg-6" style="border: 2px solid #222; background-color:#f5f5f5; border-radius: 10px; padding-bottom:10px;">
<h2><i class="fa fa-book"></i> Documentations</h2>
<div class="col-lg-6">
<p>
<ul>
<li>Egison User's Manual</li>
<ul>
<!--# include file="/templates/manual.html" -->
</ul>
</ul>
</p>
</div>
<div class="col-lg-6">
<p>
<ul>
<li>Egison Developer's Manual</li>
<ul>
<li><a href="/manual/mechanism.html">Pattern Matching Mechanism</a></li>
</ul>
<li>Egison Paper</li>
<ul>
<li><a href="https://arxiv.org/abs/1808.10603.pdf" target="_blank">Pattern-Matching Paper</a></li>
<li><a href="https://arxiv.org/pdf/1702.06343.pdf" target="_blank">Tensor Paper</a></li>
</ul>
<li>Others</li>
<ul>
<li><a href="/cheatsheet.html">Egison Cheat Sheet</a></li>
<li><a href="/quick.html">Egison Quick Reference</a></li>
</ul>
</ul>
</p>
</div>
</div>
<div class="col-lg-6">
<h2><i class="fa fa-tree"></i> Try Egison Online</h2>
<a target="_blank" href="http://console.egison.org">
<div id="console" style="height: 120px; border-radius: 5px; background-color:#222; padding: 0px; margin-bottom: 10px;"><div style="top: 0px; left: 0px; right: 0px; bottom: 0px; position: absolute; overflow: auto;"><pre class="jqconsole jqconsole-blurred" style="margin: 0px; position: relative; min-height: 100%; box-sizing: border-box;"><span class="jqconsole-header"><span class="">Online Egison Interprter Version 3.3.8 (C) 2011-2014 Satoshi Egi
Welcome to Egison Interpreter!
</span></span><span class="jqconsole-output"><span class="">** Information **
We are supporting Emacs key bindings to move cursor.
*****************
</span></span><span class="jqconsole-prompt "><span></span><span><span>> </span><span></span><span class="jqconsole-cursor" style="color: transparent; display: inline; z-index: 0; position: absolute;"> </span><span style="position: relative;"></span></span><span></span></span></pre><div style="position: absolute; width: 1px; height: 0px; overflow: hidden; left: 5px; top: 80px;"><textarea wrap="off" autocapitalize="off" autocorrect="off" spellcheck="false" autocomplete="off" style="position: absolute; width: 2px;"></textarea></div></div></div>
</a>
<a class="btn btn-default btn-primary" href="http://console.egison.org" role="button" target="_blank">Online Egison Interpreter</a>
<a class="btn btn-default btn-primary" href="/try.html" role="button" target="_blank">Online Egison Tutorial</a>
<a class="btn btn-default btn-primary" href="https://www.egison.org/demonstrations/poker-hands.html" role="button">Online Demonstrations »</a>
</div>
</div>
-->
<div class="row">
<div class="col-lg-12">
<h2><i class="fa fa-file-text-o"></i> Papers on Egison</h2>
<ol reversed="reversed" style="font-size: medium">
<li>Satoshi Egi and Yuichi Nishiwaki: <a target="_blank" href="https://www.egison.org/download/pmo-paper.pdf">Functional Programming in Pattern-Match-Oriented Programming Style</a>, <i>The Art, Science, and Engineering of Programming, 2020, Vol. 4, Issue 3, Article 7</i></li>
<li>Satoshi Egi: <a target="_blank" href="https://arxiv.org/abs/1911.04631">Scheme Macros for Non-linear Pattern Matching with Backtracking for Non-free Data Types</a>, <i>The Scheme and Functional Programming Workshop 2019</i></li>
<li>Satoshi Egi and Yuichi Nishiwaki: <a target="_blank" href="https://arxiv.org/abs/1808.10603">Non-linear Pattern Matching with Backtracking for Non-free Data Types</a>, <i>APLAS 2018 - Asian Symposium on Programming Languages and Systems</i></li>
<li>Satoshi Egi: <a target="_blank" href="https://arxiv.org/abs/1809.03252">Loop Patterns: Extension of Kleene Star Operator for More Expressive Pattern Matching against Arbitrary Data Structures</a>, <i>The Scheme and Functional Programming Workshop 2018</i></li>
<li>Satoshi Egi: <a target="_blank" href="https://arxiv.org/abs/1702.06343">Scalar and Tensor Parameters for Importing Tensor Index Notation including Einstein Summation Notation</a>, <i>The Scheme and Functional Programming Workshop 2017</i></li>
</ol>
</div>
</div>
<hr class="divider">
<div class="row">
<div class="col-lg-3">
<h3><i class="fa fa-eye"></i> Aims</h3>
<p>
We aim at <strong>intuitive representation of algorithms</strong> and <strong>formalization of human recognitions</strong>.<br/>
We believe this is the shortest way to the <strong>artificial intelligence</strong>.
</p>
</div><!-- /.col-lg-3 -->
<div class="col-lg-3">
<h3><i class="fa fa-github-square"></i> Open-Source</h3>
<p>
Developed and maintained on <a href="https://github.com/egison/egison" target="_blank">GitHub</a> by the community.
License is <a href="https://github.com/egison/egison/blob/master/LICENSE" target="_blank">MIT</a>.
</p>
<iframe src="https://ghbtns.com/github-btn.html?user=egison&repo=egison&type=watch&count=true" height="30" width="118" frameborder="0" scrolling="0" style="width:100px; height: 30px;" allowTransparency="true"></iframe>
<iframe src="https://ghbtns.com/github-btn.html?user=egison&repo=egison&type=fork&count=true" height="30" width="118" frameborder="0" scrolling="0" style="width:100px; height: 30px;" allowTransparency="true"></iframe>
</div><!-- /.col-lg-3 -->
<div class="col-lg-3">
<h3><i class="icon-haskell"></i> Haskell</h3>
<p>
Egison is written in <a href="http://www.haskell.org" target="_blank">Haskell</a> and being distributed as a <a href="http://hackage.haskell.org/package/egison" target="_blank">Hackage package</a>.<br/>
Egison inherits a lot of features from Haskell.
</p>
</div><!-- /.col-lg-3 -->
<div class="col-lg-3">
<h3><i class="fa fa-globe"></i> Related Projects</h3>
<p>Extending other languages to access Egison pattern matching!</p>
<ul>
<li>GHC Extension (on going)</li>
<li><a href="https://github.com/egison/egison-haskell" target="_blank">Template Haskell implementation</a></li>
<li><a href="https://github.com/egison/egison-scheme" target="_blank">Scheme macros</a></li>
<li><a href="https://github.com/zeptometer/egison-common-lisp" target="_blank">Common Lisp macros</a></li>
<li><a href="https://github.com/egison/egison-ruby" target="_blank">Ruby implementation</a></li>
</ul>
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<hr class="divider">
<div class="row">
<div class="col-lg-3">
<h3><i class="fa fa-question-circle"></i> FAQ</h3>
<ul>
<!--# include file="/templates/faq.html" -->
</ul>
<p><a class="btn btn-default btn-primary" href="/faq.html" role="button">View Answers »</a></p>
</div><!-- /.col-lg-3 -->
<div class="col-lg-3">
<h3><i class="fa fa-trophy"></i> Media</h3>
<ul>
<li><a href="http://www.infoworld.com/slideshow/146094/not-the-usual-suspects-10-plucky-programming-languages-the-rise-240677" target="_blank">InfoWorld article "Not the usual suspects: 10 plucky programming languages on the rise" <i class="fa fa-external-link"></i></a></li>
<li><a href="https://www.ipsj.or.jp/award/softwarejapan_award.html" target="_blank">IPSJ Software Japan Award (Japanese) <i class="fa fa-external-link"></i></a></li>
<li><a href="https://codeiq.jp/magazine/tag/egison/" target="_blank">Egi's Serial Publication on CodeIQ MAGAZINE (Japanese) <i class="fa fa-external-link"></i></a></li>
</ul>
</div><!-- /.col-lg-3 -->
<div class="col-lg-3">
<h3><i class="icon-satellite"></i> Links</h3>
<ul>
<li><a href="http://rit.rakuten.co.jp/index_en.html" target="_blank">Rakuten Institute of Technology <i class="fa fa-external-link"></i></a></li>
<li><a href="https://www.ipa.go.jp/english/humandev/index.html" target="_blank">IPA: IT Human Resources Development <i class="fa fa-external-link"></i></a></li>
<li><a href="http://hagi.is.s.u-tokyo.ac.jp" target="_blank">Hagiya Laboratory in University of Tokyo <i class="fa fa-external-link"></i></a></li>
</ul>
</div><!-- /.col-lg-3 -->
<div class="col-lg-3">
<h3><i class="fa fa-comments"></i> Community</h3>
<p>
We have <a href="/community.html#mailing-list">a mailing list</a>!<br/>
Egison on
<!-- <a href="https://kiwiirc.com/client/irc.freenode.net/#egison" target="_blank">Freenode</a>, -->
<a href="https://twitter.com/Egison_Lang" target="_blank">Twitter</a>,
<a href="https://plus.google.com/100607965943061517334" rel="publisher" target="_blank">Google+</a>,
<a href="https://www.facebook.com/egison.lang" target="_blank">Facebook</a>,
<a href="https://github.com/egison" target="_blank">GitHub</a>,
<a href="http://rosettacode.org/wiki/Category:Egison" target="_blank">Rosseta Code</a>,
<a href="https://hn.algolia.com/?q=egison#!/story/forever/prefix/0/egison%20-edison%20-elison%20-egibson" target="_blank">Hacker News</a>,
and <a href="http://www.reddit.com/domain/egison.org/" target="_blank">Reddit</a>.
Please check them!
</p>
<p>
<a href="https://twitter.com/Egison_Lang" class="twitter-follow-button" data-show-count="false" target="_blank">Follow @Egison_Lang</a>
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