[antlr-interest] Generate AST from C runtime

[Sergiy Dubovik]

Found the problem.
My first rule which contributed to AST didn't have rewrite rule, so it was
creating nodes based on ! and ^. I replace that with rewrite rule and
create AST node which appears to be the root. Now prog.tree has a token and
can be processed properly.

br,
Sergiy

On Sun, Mar 25, 2012 at 7:55 PM, Sergiy Dubovik <sergiy.dubovik at gmail.com>wrote:

> Are you referring to this example
> https://github.com/antlr/examples-v3/blob/master/C/treeparser/main.c ?
> I checked all examples. Half of them do not generate AST, another half has
> a walker.
> I know how to walk the tree, as I mentioned I got it working with some
> version of antlr and runtime, it just doesn't seem to generate proper ast
> anymore.
> Though toStringTree prints correctly.
>
> :sergiy
>
>
> On Sun, Mar 25, 2012 at 7:39 PM, Jim Idle <jimi at temporal-wave.com> wrote:
>
>> Compile the runtime in debug mode and single step - explained in the API
>> docs.
>>
>> Download the example tar and find the tree example in C. This shows that
>> you get a pointer (pANTLR3_BASE_TREE) and the super pointer of such a node
>> is pANTLR3_COMMON_TREE. The code in the runtime that generates a .dot file
>> is a good example of how to walk the tree. This is also explained in the
>> API docs. This is also talked about many times in antlr.markmail.org
>>
>>
>> Jim
>>
>>
>>
>>
>> > -----Original Message-----
>> > From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
>> > bounces at antlr.org] On Behalf Of Sergiy Dubovik
>> > Sent: Sunday, March 25, 2012 9:31 AM
>> > To: AN TLR
>> > Subject: Re: [antlr-interest] Generate AST from C runtime
>> >
>> > Uff, sorry for posting unfinished email. Tab and space have special
>> > meaning in browser.
>> >
>> > Could someone help me to generate AST from a grammar using C with a
>> > minimum amount of C code?I just want to get a pointer to an AST root. I
>> > don't need tree walker. I have a grammar which generates nice AST in
>> > AntlrWorks. Can I have the same from C? Isn't it so that Antlr
>> > generates AST if I specify options=AST;?
>> >
>> >     pANTLR3_UINT8 fileName = (pANTLR3_UINT8) "example.rpp";
>> > >
>> > >     pANTLR3_INPUT_STREAM input = antlr3FileStreamNew(fileName,
>> > > ANTLR3_ENC_8BIT);
>> > >
>> > >     pRppLexer lexer = RppLexerNew(input);
>> > >
>> > >     pANTLR3_COMMON_TOKEN_STREAM tokenStream =
>> > > antlr3CommonTokenStreamSourceNew(ANTLR3_SIZE_HINT,
>> > > TOKENSOURCE(lexer));
>> > >
>> > >     pRppParser parser = RppParserNew(tokenStream);
>> > >
>> > >      RppParser_prog_return prog;
>> > >
>> > >     prog = parser->prog(parser);
>> > >
>> > >
>> > I found that prog.tree should point to a root AST and it's not NULL,
>> > however when I try to get token, it returns NULL.
>> > Some months ago, I think I was getting proper pointer but now for some
>> > reason (I updated antlr) it doesn't work anymore. C Runtime API makes
>> > it very difficult to debug anything :(
>> >
>> > Thanks.
>> >
>> > br,
>> > Sergiy
>> >
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