[antlr-interest] Re: yet more thoughts on error handling / recovery

[Terence Parr]

On Jun 29, 2004, at 2:45 PM, micheal_jor wrote:

> --- In antlr-interest at yahoogroups.com, Terence Parr <parrt at c...> wrote:
>>> It's not _that_ big a deal to implement up/left pointers.  See my GCC
>>> grammar :)  Just jump up to the enclosing alt and you're set.
>>
>> Doing in a general way for arbitrary tree construction when you have
>> actions involved can be tricky ;)
>
> Not sure I agree. In one of my projects I found that most of the
> issues {with tree-construction/tree-parsing} can be resolved with a
> custom ASTFactory that understands that the custom ASTNode class had
> parent/previousSibling links too.
>
> I seem to remember needing a addChildEx() method. Can't quite remember
> if this was due to a shortcoming in the ASTFactory model or was just
> to keep some legacy code - that used addChild() - tickling along fine.

Roger that.  I'll keep this in mind.

Ter
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