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https://issues.apache.org/jira/browse/DERBY-4415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas updated DERBY-4415:
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Attachment: derby-4415-01-ab-customASTprinters.diff
Thanks for the quick feedback, Knut. I agree that a separate ASTVisitor
interface is a great idea. Attaching a new, simpler version of this patch:
derby-4415-01-ab-customASTprinters.diff.
Touches the following files:
A java/engine/org/apache/derby/iapi/sql/compile/ASTVisitor.java
Interface for user-written node Visitors. Provides initialization and teardown
methods.
M java/engine/org/apache/derby/iapi/sql/conn/LanguageConnectionContext.java
M
java/engine/org/apache/derby/impl/sql/conn/GenericLanguageConnectionContext.java
Adds methods for poking a user-written node Visitor into the compiler's state
variable.
M java/engine/org/apache/derby/impl/sql/GenericStatement.java
Adds calls to the user-written node Visitor if one has been supplied. The
Visitor is called for each processing phase: parse, bind, and optimize.
> 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,
> derby-4415-01-ab-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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