[antlr-interest] Changing the root of a tree in a tree parser

[John B. Brodie]

On 11/28/2011 05:32 AM, franck102 wrote:
> I am trying to do something that seems pretty simple, which is adjusting the
> root token of a tree in my tree parser.
> Basically my parser always sees a=b as a comparison and generates ^( EQUAL a
> b) as an AST, and in the tree parser I want to adjust that to ^( ASSIGN a b)
> if I am at the statement level:
> 
> statement
>     : ifStatement
>     | ...
>     | expressionStatement { if ($expressionStatement.tree.getType() ==
> EQUALS) { <set tree type to ASSIGN> }
> 
> If I try to introduce an assignmentStatement (just in the tree parser) I get
> mutually recursive rule, so that isn't an option...
> 
> Any suggestion?
> 
> 
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pass a flag as a parameter to expressionStatement that tells it whether
or not to rewrite itself as an assignment.