OK, no response. So, if anyone is interested, this is a bug my opinion. A
tool that gives no error message for input then produce a parser
that does not compile is a bug. If it isn't a valid grammar, which I
figured
out it isn't, the tool should at least produce an error message.
grammar xxx;
stuff:
'a' .. 'z' | 'A' .. 'Z'
;
The answer was buried deep in the book "The Definitive ANTLR Reference",
ISBN-10: 0-9787392-5-6, Version: 2010-2-4,
page 95 (section Element Sets). It is only valid for lexers, but was used
in
a parser context. So, it's illegal input, but a bug with the tool as well.
As an aside, I wish the book would be more detailed, a specification of
the Antlr language, as detailed as I would see for a major programming
language,
e.g., C# at
http://download.microsoft.com/download/3/8/8/388e7205-bc10-4226-b2a8-75351c669b09/CSharp%20Language%20Specification.doc,or
for Java at http://java.sun.com/docs/books/jls/download/langspec-3.0.pdf.In
both these examples, each terminal and nonterminalin the language is described
in gory detail, and a BNF provided in theappendix.There isn't any BNF in the
Antlr book, and the descriptions are not detailedenough. As a result, I have
to learn Antlr by trying many small examplesand observing how it works.
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