[antlr-interest] Re: Translators Should Use Tree Grammars

[John D. Mitchell]

>>>>> "micheal" == micheal jor <open.zone at virgin.net> writes:
>>>>>> --- In antlr-interest at yahoogroups.com, Terence Parr <parrt at c...> wrote:
[...]

> Comments: C1. Remote attribution is cool but, does it remain useful if
> one already has a symbol table?

Sure, it's basically what people do by hand now to keep track of stuff
during e.g., complex tree transformations.

> C2. Visitors tend to be used with tree built from strongly-typed nodes
> (heterogenous nodes). Ignoring the [potential] typing issue related to
> the representation of lists of [children] nodes, the strong typing
> enforces structural "correctness" - so explicit tree structure validation
> isn't required. You get it for free.

TANSTAAFL.

You trade off that type information for having to manage all of those
classes. 

Take care,
	John


 
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