[antlr-interest] ANTLR 3 & hidden token management?
David Holroyd
dave at badgers-in-foil.co.uk
Mon Aug 7 09:25:33 PDT 2006
On Sun, Aug 06, 2006 at 08:17:34PM +0000, David Holroyd wrote:
> Hi!
>
> On Sun, Aug 06, 2006 at 10:25:11AM -0700, Terence Parr wrote:
> > As for trees, I automatically track start/stop token indexes for all
> > rule invocations and hence I know the precise range of tokens
> > associated with each rule tree construction. This includes all
> > hidden channels simply because they are in range. Now, it does *not*
> > track whitespace etc... before/after the rule...those will presumably
> > be encompassed by other rule's AST construction.
>
> I can see how that would give access to {channel=99} tokens produced by
> lexing and parsing. However, I want to be able to insert 'synthetic'
> nodes into the AST / token stream, as I'm building an API for
> programmatic code generation. For instance, addComment() with ANTLR 2:
>
> http://svn.badgers-in-foil.co.uk/metaas/trunk/src/java/uk/co/badgersinfoil/metaas/impl/ASTStatementList.java
>
> Having to potentially update startIndex/endIndex values in the whole
> tree on insertion/deletion sounds a bit hairy. Does this leave me
> needing custom, linked-list Tree/Token implementations?
Actually, does anyone already have such an implementation to hand?
Google knows of only one reference to org.antlr.runtime.Token at the
moment ;)
many thanks,
dave
--
http://david.holroyd.me.uk/
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