Hi,

this part is probably your issue:

TypeName: Identifier /TypeName . Identifier

If your TypeDeclSpecifier starts out with something that isn't an Identifier, then the TypeName: will fail the first choice (Identifier), then try the second choice - which immediately calls TypeName again, which will fail the first choice (Identifier) and call itself again - and so on until it crashes or you break the processing.

In general, any time that a parser can start out by calling itself directly (without some other action occurring before), it will probably go into a loop. (This might be something that would be nice to have PetitParser catch - infinite loops. Not easy, probably not cheap, but doable.)

Also, you generally want to make the most specific option first in your parsers - if TypeName could be 'Identifier' or 'Identifier . Identifier', then you would want to check for 'Identifier . Identifier' first.

-cbc

On Tue, Dec 17, 2013 at 2:22 PM, Benjamin AREZKI <benjamin.arezki@gmail.com> 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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