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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4415) Make it easy to plug custom AST printers into the compiler
Date Tue, 20 Oct 2009 14:01:59 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas updated DERBY-4415:

    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,
> 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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