Catch Me If You Can: Sugary Exception Handling in Perl

EXCEPTION HANDLING IN PERLcatch meif you canYAPC EU 2009 = ASH BERLIN ‹ %DEVEL DECLARE / SCOPE UPPER ‹eASH BERLIN aASH BERLIN ½ MST < FLORIAN RAGWITZ / VINCENT PIT£MARK FOWLER / THE O’REILLY CAMELTuesday, 11 August 2009Catch Me If You Can:Sugary exception handling with TryCatch.pmAsh BerlinYAPC::EU 2009 – LisonA.K.A The please don’t sue me TitleTuesday, 11 August 2009Perl Sucks!(and what to do about it)Image courtesy of Mark FowlerYAPC::EU 2007 – ViennaTuesday, 11 August 2009Perl Sucks?• Of course it does, it’s software• Installing Modules is hard• Perl programs are just scripts• Its Exception handling is hateful Tuesday, 11 August 2009eval {};sucksTuesday, 11 August 2009eval {};sucksTuesday, 11 August 2009eval sucks• Sucky syntax• Easy to get (subtly) wrong.• return doesn’t work as expected• eval BLOCK vs eval EXPR• $@ is globalTuesday, 11 August 2009“But Perl already has exception handling”Lots of Exception::* and Error::* modulesTuesday, 11 August 2009None of them Perfect• Some are just an exception framework• Good; doesn’t solve catching problem• Catching errors shouldn’t be hardTuesday, 11 August 2009I want the Moon on a StickTuesday, 11 August 2009