A well paced and structured book that covers the tasks, technologies and theory required to create your own language parsers.
The book very cleverly and deliberately dovetails with the information that is already in the public domain for ANTLR; it highlights the fact that it is possible to produce a printed publication for a predominantly "live" web based tool that is more than worth the cost and effort to obtain it. There are numerous links back to the "live" documentation on the tool's web site should the reader wish to delve or involve themselves further with the topic being discussed. These do not detract from the information in the book or serve as padding - they point the reader to the best source of the information and work to help the reader gain a better understanding of the subject.
The style of the writing is also at the right level; having read through two revisions of the "Dragon" book and other very technical language processing theory books at university I am well aware of just how dry and academic the subject matter can be. This is avoided with a clear focus on what you need to do without a full discussion of the theory behind it. Those sections that deal with the theoretical background of how ANTLR does what it does are carefully quarantined in their own section and clearly indicated that they are quite difficult. This structure means that anyone reading the book can happily understand how to manipulate ANTLR to do what they need without being put off with pages of very dry and complex algorithms.
Given that ANTLR can generate parsers in a wide range of languages now, I would personally liked to have seen some of the examples use them, perhaps C/C++. I am more at home with Python & C/C++ than some of the Java examples used; offsetting that are the facts that obviously Java is the author's chosen first language and the consistency that having all of the examples in the same language achieves.
The range of the topics covered is again well thought out and well structured to lead the reader through the subject matter; a fact I suppose you should expect as the author is now a professor and has undoubtedly spent many an hour lecturing to undergraduates.
Table of contents
The Definitive ANTLR Reference : Building Domain-Specific Languages Ch 1. Getting Started with ANTLR Ch 2. The Nature of Computer Languages Ch 3. A Quick Tour for the Impatient Ch 4. ANTLR Grammars Ch 5. ANTLR Grammar-Level Options Ch 6. Attributes and Actions Ch 7. Tree Construction Ch 8. Tree Grammars Ch 9. Generating Structured Tet with Templates and Grammars Ch 10. Error Reporting and Recovery Ch 11. LL(*)Parsing Ch 12. Using Semantic and Syntactic Predicates Ch 13. Semantic Predicates Ch 14. Syntactic Predicates Index