[antlr-interest] NoViableAltException

Micheal J open.zone at virgin.net
Sun Jul 8 05:57:33 PDT 2007


What version of ANTLR did you use?. Was it ANTLR v2.7.x or ANTLR v3.x?
 
Can you post the options you set in your grammar file?
 
Micheal

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The best way to contact me is via the list/forum. My time is very limited. 

-----Original Message-----
From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Liviu U
Sent: 08 July 2007 11:05
To: antlr-interest at antlr.org
Subject: [antlr-interest] NoViableAltException


Hi all,

I built a simplistic C# parser that ignores statements blocks and handles
only declarations. The target output language is C#.
When I parse a moderate size file 500K ( the atnlr parser output ;) ) it
takes 5 seconds and a lot of NoViableAltException are raised and handled by
the parser. 
The parsing is successfull, but as we know, exception raising in .NET comes
with a big cost. I think there is a big performance hit in using Exceptions
to handle failures instead of old Winapi style return codes.
Is anything that can be done about it? 


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