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Guido van Rossum
I'm actually really liking ANTLR! I have a pretty darn good velocity with...
ANTLR at Oracle
Dermot O'Neill Senior Software Engineer ...
The decision to use Antlr and StringTemplate for Oracles next generation...
V3 just seems to 'know' what I want
I'm not an accomplished language developer by any stretch, and with 2.7.6...
Loving v3 of ANTLR
Thanks for the hard work, as a new developer to ANTLR, I've actually wrapped...
Brad Cox; Inventor of Objective-C
Just wanted to take the opportunity to say thanks. ANTLR is a BIG improvement...
Richard Stearns, Co-inventor of LL(k) and...
Because of this book, the average programmer now has easy access to the...
Thanks to all the ANTLR team !
email@example.com Thu Sep 27, 2012 09:11
Just a few words to say that we used ANTLR V3.4 to create our own extension to C99. The baby is healthy and strong (please have a look at : http://melvenn.com/cawen/the-google-benchmark/) thanks to his antlr grammar flavoured feeding-bottles ! We are so happy that you can ask us to send you a photo of us dressed up as the cervidae of your choice !
Thom & Gwen
Antlr for NLP
Mihai Surdeanu Tue Aug 28, 2012 09:29
At Lex Machina (lexmachina.com) we use Antlr for information extraction from legal texts. We ended up implementing layers of grammars (first finding entities, then relations between them) all with Antlr! This architecture is similar to GATE but Antlr is so much faster!
Using ANTLR to build a query parser and translator
Atul Dambalkar (firstname.lastname@example.org) Fri Jul 27, 2012 00:47
We have been using ANTLR to build a query parser and then converting the generated tree into MongoDB query commands. It's been a great experience with ANTLR and it has helped us solve a complicated problem where we could now write SQL like queries to query MongoDB.
ANTLR makes building custom DSLs a breeze
Mukundan Agaram (Enterprise Architect at Delta Dental) Sat Feb 4, 2012 18:10
We used ANTLR to build and parse custom Domain Specific Business Rule Languages that our Dental Subject Matter Experts use to articulate and automate complex business rules of adjudication and processing.
We all benefit from Antlr
Guido Leenders at Invantive Sat Jun 11, 2011 13:04
We have developed a software package that integrates with Microsoft Excel and extends Excel by various features. However, in some complex situations we must look into the Excel formulas and parse them.
Maximus Mon Apr 4, 2011 17:40
Using this to parse a custom lightweight scripting language. It was quick and easy to set up!
so good but so hard
Wang Bin Mon Oct 25, 2010 00:09
I am a graduate from China and just learning your ANTLR. It's good but hard to learn for me.
Guido van Rossum Sat Feb 7, 2009 10:46
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!
Turning PHP into a functional PL
Jeffrey M. Barber Wed Jun 4, 2008 10:53
Antlr v3 is awesome. I used Antlr v2 for several projects, but my latest project is turning PHP into a functional PL. I've got 90% of the translator done and I'm adding new features every day. :)
You Used Ruby to Write WHAT?!
Zed Shaw Tue Mar 4, 2008 12:58
"...using ANTLR, without much fuss I can prototype an entire new language in a weekend and deploy it to just about any computer. It's not completely effortless; I can usually create a small parser for a protocol or mini-language in about a day or two using ANTLR and one book by Terrence [sic] Parr."
Regarding The Definitive ANTLR Reference book
Gevik Babakhani Wed Jun 13, 2007 15:47
Before I got this book, I had to hack my way through various examples and whatever documentation I could find on antlr.org, sometimes resulting more questions than answers. The ANTLR book being an excellent tutorial/reference really helps understand developing solutions using this wonderful tool.
Still using ANTLR after all these years
Ron Ten-Hove Tue May 15, 2007 08:00
I've been using ANTLR since the first SIGPLAN Notices printing of the PCCTS 1.0 user manual, back in 1989. It is still among my favourite tools in my bag of tricks. ANTLR 3 is a big improvement over that first version of PCCTS, but it still is very easy to understand, when compared to things like lex/yacc. Understandability is important when you're designing some mini-language, or crafting a parser for some existing grammar; I don't have time to get a Ph.D in yacc-ology!
Vertigo Fri Jan 12, 2007 08:01
As of 4:30 yesterday afternoon, my sourceforge project (that must parse Java 1.5 source code) was doomed. As of 4:30 this morning, I believe it has been saved. Though I am a mere newbie, I am looking forward to working with this product.
Loving v3 of ANTLR
Mark Mandel Sun Dec 24, 2006 16:11
Thanks for the hard work, as a new developer to ANTLR, I've actually wrapped my head far faster around v3 in an hour, than I have with a weeks reading into v2. I'm having a blast using ANTLR with ColdFusion. I've written the beginnings of my HQL like syntax for my ColdFusion ORM, and it's been absolutely brilliant. Basically, I generated my Lexer and Parser with it, and my Parser outputs my AST. Rolling my own tree parser is so easy when using the type values as they are found against the Parser already generated by ANTLR. It's just a case of recursively travelling through the AST and doing what I need as I travel down. Honestly, couldn't be easier.
V3 just seems to 'know' what I want
Robert Hill Sat Sep 30, 2006 11:13
I'm not an accomplished language developer by any stretch, and with 2.7.6 I always felt I was fighting it to get it to do what I wanted. But V3 just seems to 'know' what I want ;) It really is awesome, you've done an amazing job with V3!
ANTLR at Oracle
Dermot O'Neill Senior Software Engineer Oracle Mon Jul 31, 2006 10:36
The decision to use Antlr and StringTemplate for Oracles next generation Migration and SQL Developer features was easy due to the fantastic support on the forums, extensive documentation and great tools. In particular, the ability to parse trees and define target languages using StringTemplate, provided the end to end language translation technology we required. Other parser generators left us high and dry with only half the solution.
Andrew Ling Tue May 23, 2006 09:18
We have been using ANTLR for several years. Our company has a few thousand business rules that are written in 4GL, and the number of rules is growing. We use ANTLR to translate them into C# code for excecution. We also use ANTLR to interpret the rules to exract the information we need. This happens nearly every working days here.
Zhang Yelei Wed Apr 5, 2006 02:40
antlr is a great tool that can even be used for event detection. Thank you for creating antlr and so many valuable documentations.
It is great that you joined Academia.
Dmitry Golovashkin Sat Apr 1, 2006 17:47
Firstly you are an exceptional genius in computer science.
anonymous (from email sent to Terence) Wed Feb 22, 2006 11:43
I work for a software shop where in the early day of Java a logging library was developed. It is a long time ago that we wanted to migrate to log4j, but nobody had what it takes to migrate tens of thousands of files to use log4j instead of the hold, clumsy library. The refactoring power of our IDE was not enough to do the job, and manually editing tens of thousands of call sites was out of question. This was a pain for the developers team a long time.
When I came accross ANTLR I thought it could be useful to do the migration. It took 1 day to get use to the tool. Much to my delight, I discovered that ANTLR can generate code in Python, which is a very dynamic language on which I am very productive.
First I was disappointed to discover that to migrate overloaded methods I had to do some type inference, which is not that straightforwards. But then I combined the power of my IDE to refactor overloaded methods into method with unique names and then applied my Python scripts. The results amazed and positively surprised my peers.
Now we no longer have that old annoying libary anymore.
Do yourself a favour
Jose San Leandro Armendariz Tue Jan 24, 2006 08:08
ANTLR allows you to face tasks not easy to accomplish without. Compiler construction theory is not something you can learn as easy as the kind of technologies you may already know. One thing is clear for me: there're some areas of IT which are worth spending time with, and ANTLR is one of them.
Very good tool, all in one approach
Sujeet Banerjee Sun Dec 18, 2005 03:57
This is a very good tool to pick up, even if you don't understand the esoteric texts on compilers or parsers.
We owe our current success in great measure to your work and thought...
Jonathan Malek Wed Dec 7, 2005 09:50
I picked ANTLR for a C# search project with a very large number of simultaneous users. We ran into only one issue under load (the solution to which I believe I found on this list, regarding the eventual failure in a multi-threaded environment of the ASTPair queue), which I was able to fix in source.
The performance is fantastic, and while it is true that the user-base seems very Java-centric, we were able to get a complex grammar in place in a matter of weeks with just one C# developer, and no prior experience in the arcana of parser theory.
Rajesh Mon Dec 5, 2005 04:26
It was really amazing using the antlr tool and i have just started to use for message parsing. Really awesome tool i have seen.
ANTLR is a great!
Aleksey Sanin Fri Nov 18, 2005 00:34
We developed a complex event processing platform programmed via an easy to use SQL-based Continuous Computation Language (CCL). ANTLR did a great job for us. Thank you!
Palaniappan Ramanathan Fri Nov 4, 2005 09:53
Its really cool. I thought the grammer for java would be very big.But I did a compiler from a subset of java and ANTLR helped me a lot. And it was pretty eay.
ANTLR 2.x is rock solid
Akhilesh Mritunjai Sun Oct 23, 2005 13:08
I can vouch for it. If you want further assurance, let me say that my career personally depends on ANTLR... and we have taken that decision after a LOT of analysis and study. ANTLR rocks!
ANTLR is backed by more than 2 *decades* of solid work by Terence. He has made a great contribution.
ANTLR is great
Sohail Sun Oct 23, 2005 12:25
I think it really requires understanding the process of writing the tools manually to be able to write antlr. Great job! I am grateful you were able to create this piece of work and I am glad I grew up in the time of antlr and not flex/yacc :D
We owe you a lot (concerning parsing and learning how to do that)
Zoran Bacic Sat Oct 1, 2005 10:32
Some of our engineers have your picture framed and officially blessed with our developer sweat and tears, not far from your two-times-life-size statue in gold, with titan-vanadium accents. Thanks a million for everything.
Congratulations on such a good job
Martin Mamo Sun Sep 25, 2005 11:10
I'm surprised something so good is free. I have just used ANTLR to generate a lexer and parser for a reasonably complex language. My work with it isn't finished, but so far I am very impressed. I'm surprised something so good is free. I can't see how I could have generated an equivalent parser by hand in the same amount of time as I have done with ANTLR.
ZG9K - my online calculator
Jeffrey M. Barber Sat Jul 30, 2005 21:52
I have been wanting to do an online CAS for sometime now. Now, that I will be teaching, I want to data-mine my students so I can maximize my coverage over problems of concern. antlr allowed me to fully specify the grunt of my language so I could rapidly get my expression trees presented online. And, I will save my students cash on an overpriced gameboy.
ANTLR is an extraordinarily capable tool!
Gerald B. Rosenberg, IP Attorney, NewTechLaw Thu Jun 23, 2005 16:06
My current project involves digging out and recognizing a variety of unpredictably located instances of semi-structured text from within natural language documents. Hardly your original design target, but still ANTLR is able to bring structure and precision to this very difficult problem. A concise, declarative, and highly maintainable grammar is far preferable to the classic alternatives of Bayesian inference engines and complex finite state machines. ANTLR's flexibility and capabilities are impressive.
I have to say, a stunningly useful bit of software Terence, Nice one
Robert Hill Thu Jun 9, 2005 10:21
I just love being able to single step into the generated code and see what its doing. The value of human readable code shouldn't be underestimated
Thanks for the great tool
Chris Monsanto Tue Jun 7, 2005 11:27
I'd just like to say I love your tool and can't wait till version 3.0. I've been working on a new programming language in some way, shape or form for around 3 years now and found ANTLR when searching for alternatives to the archaic FLEX/YACC. Thanks for the great tool and I hope work continues on it for a while to come.
ANTLR is great software
Lance Gutteridge Thu May 12, 2005 10:44
I was doing a project that needed a small language (well it was small when it started - isn't that the way). I considered writing my own parser on the basis that the language was simple and I was on a deadline, and I didn't want to take the learning curve hit. (I had used ANTLR some years earlier but I had forgotten most of that). In any event I decided to go with ANTLR. That certainly was the right decision.
I found all kinds of examples on various web sites and I was able to put my language together pretty quickly. It has grown and grown. I am so glad that I decided to go with a real parser instead of some cobbled together Java code that I was thinking of. Making changes to the grammar has been so easy with ANTLR.
ANTLR has saved me from the grunt work of doing all that parsing and let me concentrate on the specific constructs that I want. Thanks Terence et al.
THANKS FOR ANTLR
Bryan Ewbank Sun Feb 6, 2005 04:34
A very powerful tool that has enabled our team to produce much more code in much less time.
I'm glad I chose to start with the best tool that is out there!
Nigel Sheridan-Smith Thu Jan 20, 2005 20:50
Having been using ANTLR for around 6-7 months now, and being able to compare it against other tools such as SableCC, I can tell you that ANTLR is fantastic and a dream to use. It is incredibly flexible and powerful, allowing you to express your grammar in many different ways and providing you with multiple opportunities to insert actions of different kinds - both on the parser itself or the Abstract Syntax Tree with tree parsers. There are plenty of existing grammars available online which can be reused, or they can be used as a starting point for your own work. Additionally, they really help in showing you some of the more intricate detail in how to achieve different things with ANTLR. If you get stuck, there are numerous people on the mailing list who are willing to give you a push in the right direction who are all experts in different aspects - such as the C++/C#/Java generators or particular grammars that have already been created.
ANTLR can take a little bit of time to learn and some of the documentation and tutorials can be either too basic or too heavy (such as the "reference manual"). However, I have found it is worth the effort of learning - if you start out small with a simple, clean grammar (without actions) and then work upwards it becomes very easy to see how it all works. Furthermore, you can examine the highly readable output code understand what is going on. With ANTLR it is easy to overcome many of the common problems with grammars - syntactic and semantic predicates can help in overcoming ambiguities and non-determinisms by testing out different alternatives in "guess mode". Debugging is a breeze with recursive decent parsers, because you simply trace into each rule (as a method). However, it can take a while to run the code through to the exact input that breaks your parser, since rules can be called repeatedly based on different input.
I found that after a while, top-down parsers are highly intuitive. Of course, when I went to switch to a bottom-up parser, it did take a little bit of time to understand the differences. For this reason, it is usually difficult for people to switch between LL and LR parsers the first time. However, doing a little bit of research about the different types of parsers pays off and within under 2-3 hours you should be up and running.
ANTLR also have many features which I haven't used yet - token stream filtering, splitting and multiplexing (for when you need to parse different parts of the file in different ways), AST tree reconstructions (for rewriting/replacing/restructuring text), etc. I can see that many of these features would be handy for different situations, and are not the sort of things that you find in most compiler toolkits.
I did find a few difficult aspects though which might take a while to get your head around - when you have a non-determinism or ambiguity to be resolved, you have to know the grammar really well in order to work out the most appropriate syntactic predicate to resolve it - particularly when the non-determinism involves an alternative that continues within the rule or potentially "exits" the rule. Being able to work out what the next token might be can be challenging in these circumstances. However, ANTLR will consume greedily, so you can at least ignore non-determinisms temporarily until they become problematic. Also, many existing grammars are designed for LR parsers and this (potentially) requires a great deal of left-factoring to reduce conflicting rules and to eliminate left recursion. Whilst this can be a little time-consuming (and confusing with grammars you don't fully comprehend) you are then able to take advantage of some of the benefits - readability of the grammar is greatly improved and complexity is reduced. Furthermore, syntactic and semantic predicates make it very simple to understand how the parser/lexer will react in different situations.
One thing I can recommend though, is to reduce the clutter of your grammar by separating the rules from the actions. I usually tab in about 50 spaces so that all the actions are aligned on the right-hand side of the screen and the rules are still readable on the left. Furthermore, I also usually have a copy of the grammar that doesn't have actions - just the rules themselves. This makes it much easier for someone else to come in and maintain/modify your work.
Currently I have been using ANTLR with the Hibernate object-relational bridge to store the parsed text files into a relational database. The best way I have found of doing this is to generate Java classes containing all the contents to match your grammar (i.e. a Abstract Syntax Tree with concrete java objects). This can be time-consuming compared to SableCC's code generation, but you can limit the number of classes to exactly what you need rather than a class for each and every rule. Using actions in the parser, you can instantiate the java classes and then fill in the details as you encounter each token. I have been using the getter and setter methods that are required by Hibernate. Then I create the XML file required by Hibernate and "save" the top level constructs/classes. Hibernate takes care of the rest! The two pieces of software work really well together.
I am really looking forward to ANTLR 3.x - from what I have read from Terence's blogs and the recent workshop, it promises to remove many of the remaining issues, such as left recursion and LL(*) parsing, multi-lingual errors and some of the performance issues that have been brought up on the list. It also sounds like it will have some very nifty features - like "channels" for parsing multiple streams of tokens from the same file.
All in all, its an amazing tool. Thanks for Terence, Ric and many others who have made it available for all to use!
A Pleasure To Use
Wolfgang Haefelinger Thu Oct 28, 2004 23:39
This tool, antlr, is kind of pleasure to use. I still remember headaches I had when trying to teach lex/yacc ASN.1 couple of years ago.
Thanks for making antlr available.
giuliano carlini Fri Oct 22, 2004 16:37
It is a VERY useful tool, head and shoulders above what I've had to use before!
Thanks for ANTLR!
Achim Westermann Wed Oct 20, 2004 12:02
Many times I was able to get quick results for tricky tasks and was able to stand out in front of colleaques and supervisors thanks to ANTLR.
ANTLR is the most flexible and powerful parser generator that I know of
Thierry Miceli, creator of Ref++ Tue Jun 22, 2004 13:35
After trying several alternatives to write or generate a C++ language parser for my C++ refactoring tool (Ref++), I discovered ANTLR. Only with ANTLR I was able to create an usable and reliable parser. Thanks a lot for this great tool.
Corey O'Brien Wed May 26, 2004 10:06
ANTLR is a most impressive and powerful parser, and very easy to use. From the moment I installed the tool until the first working prototype of my utility, it took me a little less than three hours to parse caption strings from Delphi .DFM files into an XML format. As a student who gave my compiler construction professor aneurysms in college, this strikes me as particularly impressive. I humbly believe, however, that it reflects better on the straightforward nature of the tool than on my skills. Most of all I want to put in a testimonial for Terence. What a nice fellow! I found him to be a very friendly, approachable, and helpful resource when I was trying to solve a problem with the TokenStreamRewriteEngine. It was dropping whitespace from the output because I forgot to comment out the call to $setType(Token.SKIP).
ANTLR serves the whole range of developers
Oliver Zeigermann Mon Oct 27, 2003 19:34
Due to the lack of complexity ANTLR allows the beginner to write parsers in very short time, while it gives the full power to the advanced user. That's way I chose ANTLR for my XPA XML transformation framwork. ANTLR's community is unmatched by any other I know, and antlr.org is highly informative.
VB to C# translator
Jack Porterfield, CEO Immunicode Sat Oct 25, 2003 18:19
... we feel that antlr has been a tremendous and critical help to us. Thank you.
Developed makup language parser with ANTLR on .NET
Soumen Sarkar Thu Oct 9, 2003 19:51
Developed a custom markup language (like XML) parser on .NET platform with ANTLR/C#. This parser is being used in many countries over the world. I would say ANTLR is a great product and a very vibrant supportive community. The synergy makes it a very powerful tool to solve a wide vareity of problems.
Arnar Birgisson Wed Oct 8, 2003 18:22
I just love ANTLR! I have been using lex/yacc for quite a few projects, and LL-predicated lexing opens up a whole new world of possibilities.
As I have mentioned before, I am taking (or have taken) courses in compiler design and programming language theory. Discovering ANTLR has helped in making me seriously thinking about aquiring a masters degree specializing in this field of CS.
Reading posts on the antlr-interest as well as contemplating on the problems posted there has given me just as much of an understandnig on the practical side of my studies as all the lectures combined, and seeing ANTLR in action solving compicated problems (somtimes context-dependent) makes me appreciate it greatly.
A big hand for Terence and all the others involved in ANTLR's design and implementation!
Lutz Hamel, Technical Manager, Thinking Machines Corp. Sat Jun 14, 2003 09:15
It is not often that a mature discipline like the field of compiler construction is shaken by a new and fundamental contribution. However, it is already clear that the technology underlying PCCTS, pred-LL(k) language recognition, has made such a fundamental contribution manifesting itself in one of the most readable parser specifications for the C++ language in the industry. Therefore, this book is required reading for anybody considering a serious programming language implementation project.
Frank DeRemer, inventor of SLR and LALR grammars and parsers; Co-Founder and President of MetaWare Inc. Sat Jun 14, 2003 09:15
This is a book after my own heart: practical! I agree with the author:
"Programmers want to use tools
 that employ mechanisms they understand,
 that are sufficiently powerful to solve their problem,
 that are flexible,
 that automate tedious tasks, and
 that generate output that is easily folded into their application.
This book is intended as a reference, not as a textbook or how-to book on language translation. [regarding PCCTS and associated book, the C/C++ version of ANTLR].
Richard Stearns, Co-inventor of LL(k) and recent awardee of Turing award Sat Jun 14, 2003 09:14
Because of this book, the average programmer now has easy access to the power and flexibility of top-down parsing. The ANTLR and SORCERER tools it describes should be useful for those writing any kind of a translator, including those writing sophisticated compilers. The book will be useful as a tutorial, a reference guide, and an educational tool. I recommend it highly. [regarding PCCTS and associated book, the C/C++ version of ANTLR]
Jay Levitt, Chief Mail Systems Architect, America Online, Inc. Sat Jun 14, 2003 09:12
I'm writing an anti-spam engine using an ANTLR-parsed configuration language. This engine will run on the backbone of AOL, handling more than a thousand e-mails per second. You don't get much more production than that.
So far, the support I've seen on ANTLR, from both Terence and the ANTLR community, has far exceeded what I've seen elsewhere - both for other open-source software like GNU, for which we pay beaucoup bucks for a "support contract" from a major open-source vendor, and proprietary software such as operating systems from vendors with which we have many-million-dollar relationships.
I haven't seen a problem during development that I couldn't solve within 24 hours. And, as others have echoed, most problems with ANTLR do occur at the development stage; if your grammar gets past the parser generator, it should run just fine.
I'd call ANTLR a keeper.
Ian Kaplan Sat Jun 14, 2003 09:11
As far as I can tell, there are only a few people in the world who know as much about parser generator design as Terence. [Check out Ian's ANTLR page http://www.bearcave.com/software/antlr]
Brad Cox; Inventor of Objective-C Sun Jun 1, 2003 12:00
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!
anonymous Sat Mar 1, 2003 11:00
Just wanted to let you know I think ANTLR is great. I didn't know ANY THING about parsers etc. In three days since downloading your application and documentation i have been able to use it at my work to scan and parse documents, transform database queries into documents, etc. the potential for this thing is unlimited !! I even started writing my own mini web template processing. This makes everything so easy! with this tool a programmer should be able to do anything
John Lam Tue Jul 16, 2002 00:00
Joe Kraska Wed Jan 30, 2002 11:12
I just wanted to say _thank you_. Your work with ANTLR is truly something to be proud of. Unlike most pieces of software, where the more you get to know it, the more you grow to see its faults, ANTLR continues to impress. Every time I go back to the manuals, having worked a bit more, and therefore able to absorb more, I find a work which is intuitive and designed just right. Awesome job.
Victor Tseng Wed Jul 12, 2000 11:01
I would like to thank you and all other ANTLR guys for doing a such nice job!
David Pollak Wed Jul 5, 2000 00:00
I've just finished reading the docs for ANTLR. It's one of the best thought out pieces of software I've seen in years. You're one frickin' smart guy.
Mike Barnett Fri Jun 16, 2000 09:02
I am very happy with Antlr and the C++ code it generates. The support has been tremendous; the suggestions and help on this list [antlr interest list] incredibly useful.
Eric Dumas Thu Jun 15, 2000 13:48
Antlr is reliable, small, multi-os and quick. The fact you get the source is great because you can furthermore understand what's going on. We use antlr in a massive multi-threaded and distributed application (for production purpose), and it is working perfectly.
Bernhard Damberger Fri Dec 17, 1999 10:57
I think antlr is a great tool! I have been using it in its various forms since 1995, and consistently find my self doing stuff that I wouldn't have thought possible. I am not sucking up...its just a plain simple fact.
Alessandro Bottoni Wed Dec 1, 1999 10:00
ANTLR is simply FANTASTIC!
Thomas Schumacher Mon Oct 11, 1999 15:47
I'd like to thank Terence and his supporters for this great tool: It is really fun to use ANTLR!
David King Thu Aug 12, 1999 15:32
I was struggling to write an OFX parser by hand, and then I discovered ANTLR. In 1 day, I learned ANTLR and wrote a parser, which had taken me over 1 week to code manually. The meta language is very intuitive and I made a lot of use of the TreeParser feature. It is rare to find such a well-engineered tool.