[antlr-interest] Is it possible to debug tree rewriters (grammars translating AST to AST)?

[Eric]

On Fri, Nov 11, 2011 at 12:24 PM, Eric <researcher0x00 at gmail.com> wrote:

>
>
> On Fri, Nov 11, 2011 at 12:12 PM, Piotr Sobczyk <sobczyk.peter at gmail.com>wrote:
>
>> Thanks, Eric but did you read my question carefully? I have no
>> problems with debugging a plain TreeGrammar and I know how to do it.
>> My problems occur when I add output = AST and filter = true options to
>> that grammar. Then the generated parser can't be even compiled by
>> javac. You can copy-paste my minimal example, generate a parser from
>> it and then try to compile the parser to see exactly what the problem
>> is.
>>
>> 2011/11/11 Eric <researcher0x00 at gmail.com>:
>>
>
> Thanks for pointing that out. My mistake.
>
> I don't have an answer to that as I have never tryied that. If I find a
> way to do it or can verify that it can't be done I will post something.
>
> Thanks, Eric
>
>
>
>
>> >
>> >
>> > On Fri, Nov 11, 2011 at 6:47 AM, piotr.sobczyk <sobczyk.peter at gmail.com
>> >
>> > wrote:
>> >>
>> >> This is a very minimal example of something called TreeRewriter in
>> Antlr:
>> >>
>> >> tree grammar Test;
>> >>
>> >> options {
>> >>    ASTLabelType = CommonTree;
>> >>    output = AST;
>> >>    filter = true;
>> >> }
>> >>
>> >> tokens {
>> >> TEST;
>> >> }
>> >>
>> >> test
>> >>    :
>> >>    ^(TEST .) -> ^(TEST)
>> >>    ;
>> >>
>> >> The important chunks are options: output = AST and filter = true. These
>> >> two
>> >> combined together make a TreeRewriter (this is a class name that
>> generated
>> >> parser extends).
>> >>
>> >> Now please compile it with -debug flag like that:
>> >>
>> >> java -cp antlr-3.3-complete.jar org.antlr.Tool -debug Test.g
>> >>
>> >> What is generated in my case is a class defined like this:
>> >>
>> >> public class MyTreeRewriter extends DebugTreeRewriter{
>> >>
>> >> And here the problems start. There is no class DebugTreeRewriter
>> defined
>> >> in
>> >> Antlr jar so I'm getting a compilation error. Moreover when I googled
>> >> DebugTreeRewriter I didn't found any single trace of such class
>> existence!
>> >>
>> >> I'm getting a lot more compilation errors because it seems generated
>> class
>> >> assumes that it inherited a lot of members from DebugTreeRewriter and
>> they
>> >> obviously can't be found.
>> >>
>> >> I'm starting to be suspicious that there is not support for debugging
>> tree
>> >> rewriters at all so far. Can someone confirm/deny this? Did anyone
>> >> succeeded
>> >> to debug a tree rewriter?
>> >
>> >
>> > Yes.
>> >
>> > See http://www.antlr.org/wiki/pages/viewpage.action?pageId=4554901
>> >
>> >
>> >>
>> >> --
>> >> View this message in context:
>> >>
>> http://antlr.1301665.n2.nabble.com/Is-it-possible-to-debug-tree-rewriters-grammars-translating-AST-to-AST-tp6985126p6985126.html
>> >> Sent from the ANTLR mailing list archive at Nabble.com.
>> >>
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>> >
>>
>
>