18 Dec
2013
18 Dec
'13
8:16 a.m.
You will not have infinite recursion at the instanciation of the parser,
but if you have a cycle that does not consume any character it means you
have an infinite loop when you parse.
Try to interrupt the infinite loop where you fall; you will see the
concerned parsers.
You should also use the GT-PetitParserDebugger from andrei
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2013/12/17 Benjamin AREZKI <benjamin.arezki(a)gmail.com>
No it's not a mistake, both have exact same
definition but the not the
same and it's useful because I use those rules in other parts of the
grammar and it helps for the comprehension. Yeah I think it create an
infinite recursion but normally I can't have this problem with
PPCompositeParser ..
2013/12/17 Nicolas Anquetil <Nicolas.Anquetil(a)inria.fr>
--
*Guillaume Larcheveque*
well one thing I can see is that there is no way to decide between ClassType
and InterfaceType
because both have the exact same definition (or is it a mistake in the
mail?)
I wouldn't think this can crash petitparser, I would have think it would
just always go for classtype and never interfacetype
But this sure looks strange. Why would you need both? if they are the
same?
Another thing I am spotting is that there is a kind of recursive loop:
ClassOrInterfaceType > ClassType > TypeDeclSpecifier ClassOrInterfaceType
So may be it is entering an infinite recursion always following this same
path ... ?
In a typical grammar, you would need something before the recursive call
to make sure some token is consumed at some point otherwise it can just
call rules recursively without consuming any otken in the input stream
nicolas
On 12/17/2013 11:32 PM, Benjamin AREZKI wrote:
Unfortunately no, I am actually in an other university ... Do you have
any idea about this problem ?
2013/12/17 Uko2 [via Smalltalk] <[hidden
email]<http://user/SendEmail.jtp?type=node&node=4730847&i=0>
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On 17 Dec 2013, at 23:22, Benjamin AREZKI <[hidden
email]<http://user/SendEmail.jtp?type=node&node=4730845&i=0>>
wrote:
Hi,
To explain my problem I will take this sample , my parser is a
PPCompositeParser.
ClassOrInterfaceType: ClassType / InterfaceType
ClassType:TypeDeclSpecifier, TypeArgumentsopt
InterfaceType: TypeDeclSpecifier, TypeArgumentsopt
TypeDeclSpecifier: TypeName / ClassOrInterfaceType . Identifier
TypeName: Identifier /TypeName . Identifier
Ok, so Identifier works well, no problem but when I tested
typeDeclSpecifier, I lost the contral of Pharo but I don't know why because
I use a PPCompositeParser. For the moment I use some tricks but I would
like it works normally.
Thanks for your help.
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