[antlr-interest] Tree pattern maching using the C# (was C) target

[Marc Speyer]

Hi Johannes,

Please find the file attached. I can get it compiled with this file but When
I then run the grammar nothings happens whereas I have grammar rules and
actions (see my previous post).

I have not tested the CSharp3 target myself yet because I could not compile
the source for it either but did only spend a lot bit of time on it since I
cannot find anything about the status of the CSharp3 target.

Any help would be much appreciated.

Thanks,
Marc

>-----Original Message-----
>From: Johannes Luber [mailto:JALuber at gmx.de]
>Sent: Wednesday, January 20, 2010 1:42 AM
>To: Marc Speyer; antlr-interest at antlr.org
>Subject: Re: [antlr-interest] Tree pattern maching using the C# (was C)
>target
>
>> Hi Johannes,
>>
>> I tried the version that you mentioned by downloading it from
>> antlr:/runtime/CSharp2 in the Fisheye code repository and then tried to
>> compile it using VS2008. This didn't work because a file
>> "TokenConstants.cs"
>> was reported missing by VS2008 and gave me compilation errors. I managed
>> to
>> get a version from the CSharp3 repository and after making one change I
>> could compile.
>
>Oops - I thought that I had checked in that file already. Can you send both
>TokenConstants.cs (for comparing with my own version) and the modified
>grammar file to the list? I'm not sure where the error can be as I lifted
>more than a few file from the CSharp3 target.
>
>Sam, can you check if the grammar works with CSharp3 target? It would be
>helpful to narrow down the cause.
>
>Johannes
>
>> I noticed that the Downup method is part of the Treefilter
>> class which inherits from the TreeParser class. The grammar for the tree
>> parser from the example has the following header:
>>
>> // START: header
>> tree grammar DefRef;
>> options {
>>   tokenVocab = Cymbol;
>>   ASTLabelType = CommonTree;
>>   filter = true;
>>   language=CSharp2;
>> }
>> @members {
>>     SymbolTable symtab;
>>     Scope currentScope;
>>     public DefRef(ITreeNodeStream input, SymbolTable symtab)
>>     	: this(input)
>>     {
>>         this.symtab = symtab;
>>         currentScope = symtab.globals;
>>     }
>> }
>> // END: header
>>
>> Generating the tree parser gives DefRef.cs with the DefRef class declared
>> as:
>>
>> public partial class DefRef : TreeParser
>>
>>
>> Now I can cast this into the TreeFilter class but to test things quickly
>I
>> changed the above line in the DefRef.cs into:
>>
>> public partial class DefRef : TreeFilter
>>
>>
>> In the calling program I use:
>>
>> DefRef def = new DefRef(nodes, symtab); // use custom constructor
>> def.Downup(t); // trigger symtab actions upon certain subtrees
>>
>> When I run this nothings happens whereas I have grammar rules and actions
>> like:
>>
>> exitBlock
>>     :   BLOCK
>>         {
>>         Console.WriteLine("locals: "+currentScope);
>>         currentScope = currentScope.getEnclosingScope();    // pop scope
>>         }
>>     ;
>>
>> I have not figured out yet why this doesn't work. The examples is a
>> one-to-one port of the Java example of pattern 17 Symbol Table for Nested
>> Scopes of the Language Implementation Patterns.
>>
>> Any idea?
>>
>> Thanks,
>>
>> Marc
>> >-----Original Message-----
>> >From: Johannes Luber [mailto:JALuber at gmx.de]
>> >Sent: Friday, January 15, 2010 1:59 PM
>> >To: Marc Speyer; antlr-interest at antlr.org
>> >Subject: Re: [antlr-interest] Tree pattern maching using the C target
>> >
>> >> Hi all,
>> >>
>> >> I have a similar issue using the C# target. Using the Cymbol.g example
>> of
>> >> pattern 17 Symbol Table for Nested Scopes of the Language
>> Implementation
>> >> Patterns book I could not get it to work because there is now downup
>> >> method.
>> >> According to the documentation this method walks the AST code using
>> >> ANTLR's
>> >> built-in downup( ) strategy.
>> >>
>> >> Am I correct assuming that this has not been implemented yet for the
>C#
>> >> target (as Jim implies in his response). Is it difficult to implement
>> it
>> >> myself? I guess it would involve implementing the tree pattern
>matching
>> >> stuff.
>> >>
>> >> Marc
>> >
>> >You are correct - there is no official version yet, which implements
>tree
>> >pattern matching. I haven't gotten around to the API changes yet (will
>> work
>> >on that next week), though I have checked in some untested changes. It
>> >would be the easieast if you'd base your own code on that for now.
>> >
>> >Johannes
>> >
>> >> P.S. Hope this email files under the proper subject thread, and
>> apologies
>> >> in
>> >> advance if it isn't (Just subscribed to the mailing list but I could
>> not
>> >> find out how to get previous posts from it)
>> >>
>> >> > Pattern matcher or normal tree walker? The pattern stuff is not
>> >> implemented in the C target yet.
>> >> >
>> >> > Jim
>> >> >
>> >> >> -----Original Message-----
>> >> >> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
>> >> >> bounces at antlr.org] On Behalf Of Heiko Folkerts
>> >> >> Sent: Thursday, January 14, 2010 5:01 AM
>> >> >> To: antlr-interest at antlr.org
>> >> >> Subject: [antlr-interest] Tree pattern maching using the C target
>> >> >>
>> >> >> Hi all,
>> >> >> I wrote al litle tree pattern matcher for a specific validation we
>> >need
>> >> >> in our grammar. ANTLR and the C compiler compile it all well but
>> there
>> >> >> is now "downup" mehtod for running the matcher. Instead I only see
>> our
>> >> >> own rules in the generated parser. So, is the method to run when
>> using
>> >> >> a tree pattern macher in the C target different than ^"downup"? How
>> to
>> >> >> run the matcher?
>> >> >>
>> >> >> I tried to find an answer in the C examples but there was only a
>> >> >> treeparser and no tree pattern matcher.
>> >> >>
>> >> >> Thx+
>> >> >> Heiko
>> >> >>
>> >> >>
>> >> >> --
>> >>
>> >>
>> >>
>> >> List: http://www.antlr.org/mailman/listinfo/antlr-interest
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>> >
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