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https://issues.apache.org/jira/browse/DERBY-4415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767501#action_12767501
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Knut Anders Hatlen commented on DERBY-4415:
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Hi Rick,
This looks like a useful addition. Just a thought, but would it be better to
create a new interface (say ASTVisitor) that extended Visitor so that only
those visitors that actually use the begin() and end() methods need to
implement them?
> Make it easy to plug custom AST printers into the compiler
> ----------------------------------------------------------
>
> Key: DERBY-4415
> URL: https://issues.apache.org/jira/browse/DERBY-4415
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Rick Hillegas
> Priority: Minor
> Attachments: ASTInspector.java,
> derby-4415-01-aa-customASTprinters.diff, XmlASTPrinter.java
>
>
> It would be nice to be able to tell the compiler to use user-written
> formatters for pretty-printing Derby's abstract syntax trees. For instance,
> it would be nice to be able to plug in the AST printers attached to
> DERBY-791, including the Eclipse-based tree grapher written by Kay Röpke.
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