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Getting some more info about from ParseError.
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Václav Haisman  
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 More options Nov 29 2006, 3:42 am
From: Václav Haisman <v.hais...@sh.cvut.cz>
Date: Wed, 29 Nov 2006 09:42:33 +0100
Local: Wed, Nov 29 2006 3:42 am
Subject: Getting some more info about from ParseError.
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Hi,
I am using Pyggy to parse our simple DSL. Most of the time it is just
simple expressions. While the expressions are by the grammar everything
works fine. The problem is that when the expression is bad i.e. '(1 + 2'
 or '1 + / 2' the thrown ParseError exception has very little info about
the error except the bad token and its text. It would be very useful if
I could get list of expected tokens following the last good token.

Is it possible to get the information somewhere from the internals of
the parser's GLR class? I tried several hacks but since I do not really
understand the algorithm I was never able to get what I wanted. The main
problem seems to be to get the list of last good states from the parser.
After that I think it should be possible to get the list of expected
tokens from the acttab's keys or from goto tab's maybe.

It would be really really nice to have this feature :)

--
Vaclav Haisman


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Václav Haisman  
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 More options Jan 26 2007, 3:22 am
From: "Václav Haisman" <v.hais...@sh.cvut.cz>
Date: Fri, 26 Jan 2007 08:22:12 -0000
Local: Fri, Jan 26 2007 3:22 am
Subject: Re: Getting some more info about from ParseError.
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No activity at all :(
C'mon, somebody say something...

--
VH


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