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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Why Use ANTLR?</title>
<meta name="keywords" content="language translation, languages, tree parser, parsing, parser generator, template, engine, template engine, code instrumentation, Java, Python, C Sharp, C#, C++, Terence Parr, ANTLR, translation, code generation, templates, model-view-controller, MVC, strict separation, function language, StringTemplate" />
<meta name="description" content="ANTLR: ANother Tool for Language Recognition, (formerly PCCTS) is a language tool that provides a framework for constructing recognizers, compilers, and translators from grammatical descriptions containing Java, C#, C++, or Python actions." />
<meta name="description" content="StringTemplate: a Java template engine used for any application generating text such as language translators and dynamic web sites; available in C# and Python as well." />
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Description: StringTemplate is a template engine used for any application generating text such as language translators and dynamic web sites.
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Support StringTemplate, ANTLR Project by making a donation! Terence often pays for things like the antlr.org server, conference travel, and this site design (that alone cost US$1000). Buy him a beer and pizza remotely ;)
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<br><font size=4><strong>Why Use ANTLR?</strong></font><br><br>
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[Here is a blog where people discuss the process of <a href="http://www.beust.com/weblog/archives/000145.html"><b>picking up ANTLR for the first time</b></a>.]
<br><br>I've been building parsers and translators since 1984. Naturally I
built all my initial translators by hand with recursive-descent
parsers. Eventually I wanted a tool that automated parser
construction, but I hated <tt>yacc</tt>-like tools because they
generated a table full of integers instead of human-readable code.
Further, LR-based technology was much harder to understand than
the intuitively obviously LL-based recursive-descent parsers. ANTLR
grew out of my desire to automate exactly what I did by hand. Over
the years, I've added features such as tree parsing that are also
derived from actual experience building large translators.
<br><br> ANTLR's popularity comes down to the fact that it satisfies
the following fundamental requirements. Programmers want to use
tools:
<ol>
<li>that employ mechanisms they understand,
<li>that are sufficiently powerful to solve their problem,
<li>that are flexible,
<li>that automate tedious tasks, and
<li>that generate output that is easily folded into their
application.
</ol>
ANTLR has a consistent syntax for specifying lexers, parsers, and tree
parsers.
<br><br> Explaining why tree parsers are useful is difficult until you
have some experience building translators, nonetheless, ANTLR is one
of the few language tools that lets you apply grammatical structure to
trees.
<br><br>ANTLR generates powerful recognizers with it semantic and syntactic predicates. Plus PCCTS/ANTLR was the first widely-used parser generator to employ k>1 lookahead. My PhD dissertation provided an efficient means of computing the necessary lookahead (k>1 was previously thought to be only of theoretical interest due to its exponential cost). Be careful of other tools that allow you to use more than one symbol of lookahead; some tools can't tell you when there are problems with your grammar when k>1.
<br><br> I actively support and improve ANTLR (for over a decade now)
as does the large user community. By using ANTLR, you can be certain
that you are not betting your project on a "dead" tool. Many academic
and industry projects use ANTLR. Do a <a
href="http://www.google.com/search?q=antlr"><b>google search for
ANTLR</b></a> and you'll see a few hundred thousand hits. Do a <a
href="http://www.google.com/search?q=%22parser+generator%22"><b>google
search for "parser generator"</b></a> and you're likely to see ANTLR
shown first. Also note that there are over 5000 downloads a month of
the ANTLR package.
<br><br>
There are existing grammars available for many languages. If you
don't see it on this site, ask the antlr-interest list and somebody
may have what you need. ANTLR modes for emacs, Eclipse, and other
IDEs are also available.
<br><br>
ANTLR currently generates Java, C#, C++, and Python (as of 2.7.5).
<br><br>
ANTLR has pretty flexible and decent error handling.
<br><br>ANTLR comes with complete source code unlike many other systems and
has absolutely no restrictions on its use. I have placed it totally
in the public domain.
<br><br>
For an in depth look comparing ANTLR to other parser generators, see
this <a
href="http://www.bearcave.com/software/antlr/antlr_expr.html"><b>page
by Ian Kaplan</b></a>.
<br><br> I'm working like crazy on a completely new version and
tirelessly help people out on the mailing list and directly via
email.
<br><br>
Finally, you should use ANTLR because I'm an all around nice guy and
I'm kind to old people. ;)
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