[#BOO-879] Exception Handling: Allow for exception filters

Boo

Exception Handling: Allow for exception filters

Created: 27/Sep/07 08:36 PM Updated: 26/Oct/07 09:20 PM

Component/s:

Parser, Emitter, Compiler

Affects Version/s:

0.7.9

Fix Version/s:

0.8.1

Time Tracking:

Not Specified

File Attachments:

exception.patch (27 kb)
2.

exception.redux.patch (27 kb)
3.

exceptions.redux2.patch (45 kb)

Issue Links:

Related

This issue relates to:

~~BOO-880~~ Exception Handling: Allow for exception fault handlers

~~BOO-910~~ Boo doesn't catch non-CLS compliant exceptions at runtime

This issue is related to:

~~BOO-836~~ WSA Boo "end" keyword required for some blocks and not others

Supercedes

This issue supercedes:

~~BOO-877~~ Exception Handling: Allow anonymous typed handlers

~~BOO-876~~ Exception Handling: Remove hidden '__exception' variable

Testcase included:	yes
Patch Submitted:	Yes

Description

« Hide

The CLI currently provides a mechanism, 'filter', so that it will only handle an exception if a condition holds:

For an example: http://dotnet.org.za/armand/archive/2005/11/09/48087.aspx and http://www.microsoft.com/mspress/books/sampchap/5771.aspx

proposed syntax:

except ex as SomeException if arg is not null:
  print "arg is not null, so I'll handle it"

except as SomeException if ItDidntWork():
  print "It Didn't Work, but I'll handle it."

except unless boolArg:
  print "boolArg was true, so I'll handle it."

All

Comments

Work Log

Change History

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Marcus Griep - 06/Oct/07 09:54 PM

A smaller, more succinct, and complete patch file for all linked exception issues.

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Marcus Griep - 25/Oct/07 04:04 PM

Modified cases to use (if/unless) now that when is no longer reserved. New patch to be uploaded soon.

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Marcus Griep - 25/Oct/07 04:51 PM

New patch with linked up tests.

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Rodrigo B. de Oliveira - 25/Oct/07 05:00 PM

Could you use Declaration with a null name instead of adding a TypeReference field to ExceptionHandler?

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Marcus Griep - 26/Oct/07 12:03 PM

Updated to no longer use a TypeReference in the Exception Handler and to properly implement "Option B" (Fault block executes on uncaught exceptions, before finally). Includes comments in Emit Assembly detailing workaround necessary due to shortcoming in Reflection.Emit.ILGenerator.

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Marcus Griep - 26/Oct/07 12:07 PM

Small fix. (Accidentally included non-germane patch stuffs)

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Marcus Griep - 26/Oct/07 12:24 PM

Complete and fully re-tested. (Why do patch files have to be so picky

)

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Marcus Griep - 26/Oct/07 09:20 PM

Revision 2744