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<h2>What is ANTLR?</h2>

<p><strong>ANTLR</strong> (ANother Tool for Language Recognition) is a
powerful parser generator for reading, processing, executing, or
translating structured text or binary files. It's widely used to build
languages, tools, and frameworks.  From a grammar, ANTLR generates a
parser that can build and walk parse trees.</p>

<font size=3><p><i>Looking for <a href="http://www.antlr3.org">ANTLR v3</a>?</i></p></font>
<div id="terence"><img src="images/terence.jpg" alt="terence" />
<strong>Terence Parr</strong> is the maniac behind ANTLR and has been
working on language tools since 1989. He is a professor of computer
science at the <a href="http://www.cs.usfca.edu/~parrt">University of San Francisco</a>.
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	<li id="tab-sa"><a href="javascript:void">Samples</a></li>
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<h2 id="hd-sa">Samples</h2>
<h2 id="hd-qs">Quick Start

<br>
<font size=2>See <a href="https://theantlrguy.atlassian.net/wiki/display/ANTLR4/Getting+Started+with+ANTLR+v4">Getting Started with ANTLR v4</a></font>
</h2>

<div class="screen" id="quickstart">

	<div class="slide">
OS X
<pre>
<span class="dollar">$</span> <span class="cmd">cd</span> /usr/local/lib
<span class="dollar">$</span> <span class="cmd">sudo curl</span> -O http://www.antlr.org/download/antlr-4.2.2-complete.jar
<span class="dollar">$</span> <span class="cmd">export</span> <span class="equals">CLASSPATH=</span><span class="path">".:/usr/local/lib/antlr-4.2.2-complete.jar:$CLASSPATH"</span>
<span class="dollar">$</span> <span class="cmd">alias</span> <span class="equals">antlr4=</span><span class="path">'java -jar /usr/local/lib/antlr-4.2.2-complete.jar'</span>
<span class="dollar">$</span> <span class="cmd">alias</span> <span class="equals">grun=</span><span class="path">'java org.antlr.v4.runtime.misc.TestRig'</span>
</pre>
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<div class="slide">
LINUX
<pre>
<span class="dollar">$</span> <span class="cmd">cd</span> /usr/local/lib
<span class="dollar">$</span> <span class="cmd">wget</span> http://antlr.org/download/antlr-4.2.2-complete.jar
<span class="dollar">$</span> <span class="cmd">export</span> <span class="equals">CLASSPATH=</span><span class="path">".:/usr/local/lib/antlr-4.2.2-complete.jar:$CLASSPATH"</span>
<span class="dollar">$</span> <span class="cmd">alias</span> <span class="equals">antlr4=</span><span class="path">'java -jar /usr/local/lib/antlr-4.2.2-complete.jar'</span>
<span class="dollar">$</span> <span class="cmd">alias</span> <span class="equals">grun=</span><span class="path">'java org.antlr.v4.runtime.misc.TestRig'</span>
</pre>
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<div class="slide">
Windows
<ol>
<li>Download <a href="http://antlr.org/download/antlr-4.2.2-complete.jar">http://antlr.org/download/antlr-4.2.2-complete.jar</a>.

<li>Add antlr4-complete.jar to CLASSPATH, either:
<ul>
<li>Permanently: Using System Properties dialog > Environment variables > Create or append to CLASSPATH variable
<li>Temporarily, at command line:<br>
<pre>
SET CLASSPATH=.;C:\Javalib\antlr4-complete.jar;%CLASSPATH%
</pre>
</ul>

<li>Create batch commands for ANTLR Tool, TestRig in dir in PATH
<pre>
 antlr4.bat: java org.antlr.v4.Tool %*
 grun.bat:   java org.antlr.v4.runtime.misc.TestRig %*
</pre>
</ol>
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	<div class="slide">
		
		<pre class="pre3">
grammar Expr;		
prog:	(expr NEWLINE)* ;
expr:	expr ('*'|'/') expr
    |	expr ('+'|'-') expr
    |	INT
    |	'(' expr ')'
    ;
NEWLINE : [\r\n]+ ;
INT     : [0-9]+ ;
</pre>
		
		<pre class="pre3">
$ antlr4 Expr.g4
$ javac Expr*.java
$ grun Expr prog -gui
100+2*34
^D
		</pre>
		
		<pre class="pre3">
<img src="images/sample3.png" alt="sample3" width="130"/>
		</pre>
		
		
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	<div class="slide"><code>Linux</code></div>
	<div class="slide"><code>Mac</code></div>
	
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	<h2>Latest News</h2>
	
<a class="twitter-timeline" href="https://twitter.com/the_antlr_guy" data-widget-id="373882077285871616">Tweets by @the_antlr_guy</a>
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<h2><a href="testimonials.html">Testimonials</a></h2>	

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	<div class="testimonial">
Kudos. I'm actually really liking ANTLR! I have a pretty darn good
velocity with a rapid prototyping project I am doing in my Google 20%
time. For example, I just discovered a feature in rewrite rules that
does exactly what I need (referencing previous rule ASTs, p. 174 in
your book). It took me about 5 minutes to get this to work and remove
an ugly wart from my grammar. Hats off!
<strong>Guido van Rossum, Inventor of Python</strong>
	</div>

	<div class="testimonial">
ANTLR is an exceptionally powerful and flexible tool for parsing
formal languages. At Twitter, we use it exclusively for query parsing
in Twitter search. Our grammars are clean and concise, and the
generated code is efficient and stable. The <a href="http://pragprog.com/book/tpantlr2/the-definitive-antlr-4-reference">book</a> is our go-to
reference for ANTLR v4 -- engaging writing, clear descriptions and
practical examples all in one place.
<strong>Samuel Luckenbill, Senior Manager of Search Infrastructure, Twitter, inc.</strong>
	</div>

	<div class="testimonial">
Just wanted to take the opportunity to say thanks. ANTLR is a BIG
improvement over yacc/lex, and your support for it most
commendable. Managed to get my tired old brain around it in a
day. Nice work!
<strong>Brad Cox, Inventor of Objective-C</strong>
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<div class="col3" id="resources">
<h2>Resources</h2>	

<a href="http://pragprog.com/book/tpantlr2/the-definitive-antlr-4-reference"><img src="images/tpantlr2.jpg"
width=110></a>
<a href="http://pragprog.com/book/tpdsl/language-implementation-patterns"><img src="images/tpdsl.jpg"
width=110></a>

<br><br><a href="https://theantlrguy.atlassian.net/wiki/display/ANTLR4/Getting+Started+with+ANTLR+v4">Getting started with ANTLR v4</a>

<br><br><a href="https://theantlrguy.atlassian.net/wiki/display/ANTLR4/ANTLR+4+Documentation">ANTLR
Documentation</a>

<br><br><a href="/api">Runtime API Doc</a>
<br><br><a href="https://github.com/antlr/antlr4">Browse source tree (github)</a>

<br><br><a href="https://theantlrguy.atlassian.net/wiki/display/ANTLR4/ANTLR+v4+FAQ">Frequently Asked Questions</a>


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