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How to debug Command Core Expressions [message #547862]

Mon, 19 July 2010 21:24

Eric Jain

Messages: 266
Registered: July 2009

Senior Member

Ever so often I'm stuck with e.g. an expression that doesn't seem to work (so e.g. a handler that is supposed to be enabled isn't).

No matter how much I mess up the expressions, there are never any errors or warnings logged.

There must be a way to see what's going on, but I don't see anything mentioned at http://wiki.eclipse.org/Command_Core_Expressions.

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Re: How to debug Command Core Expressions [message #548007 is a reply to message #547862]

Tue, 20 July 2010 12:06

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

Because it's generic code, it's probably not good enough to put a
breakpoint in one of the Expression implementations (that's like adding
a breakpoint in "for" or "if").

I would put a conditional breakpoint in
org.eclipse.ui.internal.handlers.HandlerProxy.setEnabled(Obj ect), since
that's where enabledWhen is calculated.

You basically need to find your handler and then make the breakpoin in
setEnabled(*) an "Instance breakpoint". That will allow you to walk the
core expressions while they are being evaluated.

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse .platform.doc.isv/guide/workbench.htm

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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Re: How to debug Command Core Expressions [message #548121 is a reply to message #548007]

Tue, 20 July 2010 17:24

Eric Jain

Messages: 266
Registered: July 2009

Senior Member

Thanks. Before resorting to digging around in the code to set instance breakpoints I was hoping that setting some tracing options such as

org.eclipse.core.expressions/debug/TypeExtensionManager
org.eclipse.core.expressions/trace/tracePropertyResolving

would be sufficient. Neither of these two options seem to be all that useful, but perhaps there are other tracing options that might help?

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Re: How to debug Command Core Expressions [message #548701 is a reply to message #548121]

Thu, 22 July 2010 17:04

Mark Storer

Messages: 46
Registered: May 2010
Location: Vista, CA

Member

You might have some luck with org.eclipse.ui's trace options. In particular:

trace/commands
trace/handlers
trace/handlers.verbose
trace/handlers.verbose.commandId (keeps the spam down?)

To be frank, I haven't had much luck on this front either. Getting up the initial core expression learning curve was rough, even with the link in Paul's signature (thank you, by the way... I'd have been Up A Creek without it).

--Mark Storer
Senior Software Engineer
Autonomy Cardiff

import legalese.disclaimer;
Disclaimer<Cardiff> disCard = null;

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