[antlr-interest] Difficulty building trees

[Maassen, H.A.M.]

Thanks the helpful tips on visualizing trees - the ASTFrame is a nice debugging tool.

It turns out that the difficulties I had in visualizing trees were because I hadn't defined a tree structure in my grammar - I thought that ANTLR assumed one and that the operators such as the "^" were for overriding the default where in fact they seem to be required.

So right now I'm having some problems getting the following to work:

program: rule rule rule;     //or: (rule)*
rule: "a";

The resulting AST seems to only have the encompass "rule". How would I go about fixing it so that my AST would look something like this:

program
|_ rule
|   |_ "a"
|_ rule
|   |_ "a"
|_ rule
    |_ "a"

or, alternatively:

program
|_ "a"
|_ "a"
|_ "a"

Thanks for any help, 
                   Harald Maassen



 
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