ANTLR plugin does not reorder grammars connected by importVocab/exportVocab
dependencies
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Key: MNG-1614
URL: http://jira.codehaus.org/browse/MNG-1614
Project: Maven 2
Type: Bug
Components: maven-antlr-plugin
Environment: Win-XP
Reporter: Sergey Kalinichenko
Priority: Minor
Attachments: bug.zip
When ANTLR parsers (e.g. the text parser and the tree parser) share token
vocabularies through the importVocab/exportVocab options, ANTLR plugin does not
reorder grammars sent to the antlr. As the result, a compile will fail if the
grammar names are not sorted manually. A work-around is to sort the grammars
manually is usually an easy fix, but if this is something that could be
automated it would be a preferred solution to the problem.
See http://www.antlr.org/doc/vocab.html for information on
importVocab/exportVocab.
Steps to reproduce the bug:
1. Create a maven project
2. Unzip the attached file into the src/main directory. This will create antlr
directory with two files, bug.g and bugtree.g, in it.
3. Add maven-antlr-plugin to the POM with <grammars>bugtree.g,bug.g</grammars>
4. Run mvn compile. Note that the compile fails because the import vocabulary
referenced by bugtree.g does not exist.
5. Run mvn compile again. Note that this time the compile succeeds.
Expected behavior:
Ideally, the plugin should recognize that the import vocabulary required by the
grammar mentioned earlier in the list is produced by the grammar mentioned
later in the list, and re-order the grammars based on this knowledge. I
understand that this would require a lot more "parsing" than is currently going
on in the plugin, but doing so would eliminate some very subtle errors (my
co-worker spent a lot of time trying to figure out a similar problem in our
ant-based build scripts).
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