[antlr-interest] Tree parser

[Johannes Luber]

rkevinburton at charter.net schrieb:
> There must be some changes to the grammar as well. The lines:
> 
>     	ECMAScriptWalker walker = new ECMAScriptWalker(nodes); 
>      	RuleReturnScope rs = walker.program(); 
>     	Console.Out.WriteLine(rs.Template.ToString()); 
> 
> It seems that my walker start rule does not return RuleReturnScope.
> 
> Kevin

What does program() return then?

Johannes
> 
> ---- Johannes Luber <jaluber at gmx.de> wrote: 
>> rkevinburton at charter.net schrieb:
>>> I would like to generate a tree parser. Unfortunateliy the ANTLR book has very little to say of the issue (or I just don't know where to look) and the sample grammars that I see seem to implement the 'walker' different from the way ANTLR does it now. For example in the CSharp grammar there is syntax like (the 'walker grammar names are different):
>>>
>>>                CSharpwalker = new CSharpWalker();
>>>                 walker.setASTFactory(new ASTNodeFactory());
>>>                 CSharpParser.initializeASTFactory(walker.getASTFactory());
>>>
>>> where the constructor for the waler no longer takes '0' arguments. There isn't a method 'setASTFactory' and there also isn't a method 'initializedASTFactory'. If I have a TreeParser grammar how do I integrate it with the parser?
>>>
>>> Thank you.
>>>
>>> Kevin
>>>
>> I don't know where the syntax above comes actually from, but my own tree 
>> grammar used a driver like this:
>>
>> CSharpParser.grammarDef_return r = parser.startRule();
>> CommonTree r0 = ((CommonTree) r.tree);
>> CommonTreeNodeStream nodes = new CommonTreeNodeStream(r0);
>> nodes.TokenStream = tokens;
>> CSharpGenerator walker = new CSharpGenerator(nodes);
>> RuleReturnScope r1 = walker.startRule();
>> Console.Out.WriteLine(r1.Template.ToString());
>>
>> Hope this helps
>