[antlr3] .tokens files for tokenVocab can't be found in package subfolders
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Key: MOJO-905
URL: http://jira.codehaus.org/browse/MOJO-905
Project: Mojo
Issue Type: Bug
Reporter: David Holroyd
Due to the plugin arranging the output files into a folder structure that
matches the package structure of the source folder, ANTLR end's up not being
able to find the .tokens file specified by a tokenVocab option (unless the
'imported' grammar, and therefore the generated java classes, are in the
default top-level package).
This issue has been reported on antlr-interest (as ideally ANTLR would support
this use case directly),
http://www.antlr.org:8080/pipermail/antlr-interest/2007-August/023196.html
It isn't clear if this is something that the antlr3-maven-plugin can work
around, since ANTLR only allows the specification of a single folder to search
for .tokens files. In a multi-grammar build with grammars a.A, b.B and c.C,
the plugin could not know which of 'a' or 'b' to specify as the lib folder when
processing grammar C. We could inspect the dependencies of grammar C, and on
seeing a dependence on 'B.tokens' infer that the lib option should be set to
'b', but this will still be defeated in the pathological case of multiple
grammars with the same name but in different 'packages'.
I think the cause for all this confusion is that 'packages' are a
Java-output-specific concept that ANTLR itself doesn't have direct support for
(as it is intended to be able to generate code in arbitrary languages).
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