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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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This manual (22 January 2015) is for GNU Bison (version
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<title>Bison 3.0.4: Introduction</title>

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<body lang="en">
<a name="Introduction"></a>
<div class="header">
<p>
Next: <a href="Conditions.html#Conditions" accesskey="n" rel="next">Conditions</a>, Previous: <a href="index.html#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Terms.html#Index-of-Terms" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Introduction-1"></a>
<h2 class="unnumbered">Introduction</h2>
<a name="index-introduction"></a>

<p><em>Bison</em> is a general-purpose parser generator that converts an
annotated context-free grammar into a deterministic LR or generalized
LR (GLR) parser employing LALR(1) parser tables.  As an experimental
feature, Bison can also generate IELR(1) or canonical LR(1) parser
tables.  Once you are proficient with Bison, you can use it to develop
a wide range of language parsers, from those used in simple desk
calculators to complex programming languages.
</p>
<p>Bison is upward compatible with Yacc: all properly-written Yacc
grammars ought to work with Bison with no change.  Anyone familiar
with Yacc should be able to use Bison with little trouble.  You need
to be fluent in C or C++ programming in order to use Bison or to
understand this manual.  Java is also supported as an experimental
feature.
</p>
<p>We begin with tutorial chapters that explain the basic concepts of
using Bison and show three explained examples, each building on the
last.  If you don&rsquo;t know Bison or Yacc, start by reading these
chapters.  Reference chapters follow, which describe specific aspects
of Bison in detail.
</p>
<p>Bison was written originally by Robert Corbett.  Richard Stallman made
it Yacc-compatible.  Wilfred Hansen of Carnegie Mellon University
added multi-character string literals and other features.  Since then,
Bison has grown more robust and evolved many other new features thanks
to the hard work of a long list of volunteers.  For details, see the
<samp>THANKS</samp> and <samp>ChangeLog</samp> files included in the Bison
distribution.
</p>
<p>This edition corresponds to version 3.0.4 of Bison.
</p>



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